Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and Insurance Coverage for a Period of 10 Years. Year 2026-27

Interested parties are required to fill in the requisite details and submit their Technical Bid

and Financial Bid along with a non-refundable Tender fee and EMD, as per the details

S.No. Item description

Tender for Design, Supply, Installation, Testing,

Commissioning, and Go-Live of Solar/Wind IIoT

Gateway (SIG/WIG), including Communication

Infrastructure, for Remote Metering and Data

Communication of GEDA’s Distributed Rooftop

Solar Systems and Wind Projects on a DBFOOT

(Design-Build-Finance-Own-Operate-Transfer)

Basis, along with Comprehensive Operation &

Maintenance (O&M) and Insurance Coverage

for a Period of 10 Years.

A separate Tender Fee and EMD shall be submitted in favour of Gujarat Energy

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

Development Agency, payable at Gandhinagar, either in the form of a Demand Draft or a

Bank Guarantee issued by any of the banks listed in Annexure-Z of the Bid Document. The

Bank Guarantee, if submitted, shall be valid for a period of Six months with an additional

grace period of two months.

The Tender schedule is as follows:

No. Tender Schedule Date Time

1. Online Bid Submission Start Date 08/06/2026 12.00 p.m.

2. Pre Bid Meeting date at GEDA office 18/06/2026 03.00 p.m

3. Last Date of Physical Submission in GEDA 29/06/2026 02.00 p.m.

4. Online Bid Submission End Date 29/06/2026 12.00 p.m.

5. Bid Opening in GEDA Office 29/06/2026 03.00 p.m.

Director, GEDA reserves the right to reject any/all offers without assigning any reasons

Gujarat Energy Development Agency, Gandhinagar

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

2. TABLE OF CONTENTS

2. Deemed Examination, Clarifications and Acceptance ...................................................

3. Bidder's Responsibility to Understand Scope................................................................

4. Submission of Offers – Mode and Timelines .................................................................

5. Superscription of Physical Bid Envelopes ......................................................................

7. Mandatory Signing, Stamping and Authentication........................................................

10. Document Submission, Verification and Evidence ....................................................

12. Consequences of Misrepresentation, Fraud or Withdrawal .....................................

13. Tender Fee and Earnest Money Deposit (EMD).........................................................

14. Submission of Tender Fee and EMD – Format and Bank List.....................................

18. No Automatic Entitlement Based on Price ................................................................

19. Consequences of Failure to Accept Work Order/AT or Withdrawal ..........................

22. Compliance with Laws, Regulations and Statutory Requirements ............................

24. Default in Performance and Remedial Action by GEDA.............................................

25. Access, Inspection and Quality Assurance .................................................................

28. Cross-Vendor Coordination – SIG Hardware Vendor Obligations ..............................

30. Packing, Marking, Transit and Delivery Responsibility...............................................

31. Publicity, Confidentiality and Intellectual Property Restriction .................................

34. Project Reporting and Monitoring Compliance .........................................................

7. SCOPE OF WORK AND TECHNICAL SPECIFICATIONS..............................................................

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

a) IoT-Based Monitoring & Data Communication Requirements .................................................

3.2. Scope of work for Remote Metering and Communication system ..................................

3.3. PROOF OF CONCEPT (POC) FOR REMOTE METERING SYSTEM: ........................................

6.1. General Arrangement of Solar IoT Gateway (SIG) : ..........................................................

6.2. Solar IoT Gateway (SIG) Rating and its key components: .................................................

6.3. Remote Monitoring System/Communication System Requirement:- ..............................

11. The operation, Onsite support, and maintenance............................................................

1. Annexure-1: General Information about bidders ........................................................

2. Annexure-2: Work Experience of Last Three Financial Years .....................................

4. Annexure-4: Declaration of Non-Conflict of Interest (Employment of Relatives) .......

5. Annexure-5: Undertaking For No Deviation From Tender Terms & Conditions ..........

8. Annexure-8: Notarized Undertaking Regarding Valid Electrical Contractor License:

Subject: Undertaking regarding Electrical Contractor License and Compliance with

9. Annexure-9: Undertaking For Exemption From Tender Fee & EMD ..........................

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

10. Annexure-10: Notarized Undertaking Regarding Non-Debarment and No Dues ..

11. Annexure-11: Undertaking for Secrecy and Confidentiality ..................................

13. Annexure-13: Details of Earnest Money Deposit and Tender Fee Attached .........

14. Annexure-Z: List of banks for bank Guarantee ......................................................

1. FOR Destination Monthly Service Pricing ......................................................................

2. Comprehensive Scope Cost under DBFOOT Model .......................................................

9. Bid Evaluation and L1 Determination Criteria ...............................................................

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

3. LIST OF ABBREVIATIONS

AC Alternating Current

BOQ Bill of Quantity

BOS Balance-of-System

CMC Comprehensive Maintenance Contract

DCU Data Concentrator Unit

IEC International Electro technical Commission

IEEE Institute of Electrical and Electronics Engineers

IIoT Industrial Internet of Things

IP Internet Protocol /Ingress Protection

IS Indian Standard

MIS Management Information System

MNRE Ministry of New & Renewable Energy, Government of India

PoC Proof of Concept

PVC Polyvinyl chloride

RTC Real-Time Clock

SCADA Supervisory Control And Data Acquisition

GERC Gujarat Electricity Regulatory Commission

SPD Surge Protection Device

SNA State Nodal Agency for Renewable Energy

UAT User Acceptance Test

GEDA Gujarat Energy Development Agency

RMS Remote Monitoring system

SLA Service Level Agreement

MQTT Message Queuing Telemetry Transport.

HTTP Hyper Text Transfer Protocol

TLS Transport Layer Security

SSL Secure Sockets Layer

DLMS Device Language Message Specification

API Application Programming Interface

JSON JavaScript Object Notation

Modbus Modular Bus Communication Protocol

SIG Solar IIoT Gateway

SMC Sheet Moulding Compound

RJ45 Registered Jack

RJ11 Registered Jack

Wi-fi Wireless Fidelity

NB-IoT Narrowband Internet of Things

GSM Global System for Mobile Communications

GPRS General Packet Radio Service

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

DoT Department of Telecommunications

TRAI Telecom Regulatory Authority of India

HES Head End System

MDMS Meter Data Management System

MDAS Meter Data Acquisition System

DISCOM Distribution Company

ACDB AC Distribution Box

BLE Bluetooth Low Energy

TIA Telecommunications Industry Association

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

4. INSTRUCTIONS TO BIDDERS

1. Bid documents will be available on https://tender.nprocure.com until the date

specified in the tender advertisement.

2. Bidders must register on the nProcure portal and procure a legally valid Digital

Signature Certificate (DSC) as per the Information Technology Act,

3. All bids shall be digitally signed. Physical submission of the Price Bid will disqualify the

Bidder. Offers in physical form only shall not be accepted under any circumstance.

4. Conditional bids with any deviations shall not be accepted.

5. Bids without Tender Fee or EMD, or both, or which do not fulfil conditions as

mentioned in the tender shall be summarily rejected.

6. GEDA reserves the right to reject any or all bids or split the work between more than

one Bidder without assigning any reason thereof.

7. Erasures and other changes shall be initialled (signed and stamped) by the authorized

8. Offers of only those firms or individuals who are technically capable and sound for

providing such services as per Eligibility Criteria and who give satisfactory evidence of

such experience shall only be considered.

9. Self-certified copies of documents shall be submitted. Originals must be produced for

verification upon request.

10. Bidder shall mandatorily submit the Checklist as mentioned in Annexure-12 along with

supporting documents in the Physical Bid.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

5. ELIGIBILITY CRITERIA FOR BIDDERS

1. Legal Entity & Registration: The Bidder shall be a body corporate incorporated in India

under the Companies Act, 1956/2013, or a registered Partnership/Proprietorship firm

with valid government registration. Fictitious, deregistered, or liquidated entities shall

be summarily disqualified.

2. Technical Eligibility Criteria:

The Bidder shall meet the following minimum eligibility requirements:

(a) Relevant Experience

o The Bidder shall have experience in:

 Manufacturer; and/or Supply, Executing, installing, integrating,

commissioning, and maintaining IoT/SCADA/Remote Monitoring

Systems, Smart Metering Systems, or Telemetry Projects.

(b) Applicable Sectors

o The above experience shall be in the following sectors:

 Power/Energy Sector;

 Oil & Gas Sector;

 Water Utilities Sector; or

 Other similar infrastructure/utility applications.

(c) Geographical Requirement

o The projects cited for qualification shall have been executed within India.

(d) Operational Project Requirement

o The cited projects/systems shall have been successfully commissioned and

operational either as on the date of bid submission or during the qualifying

period of the last three (3) financial years. The Bidder shall submit relevant

documentary evidence in support of the claimed experience, which may

include copies of Work Orders/Contract Agreements, Purchase Orders (POs),

Commissioning Certificates, Work Completion Certificates, and/or

Performance or Operational Certificates issued by the client. The submitted

documents shall clearly indicate the nature and scope of work executed,

commissioning and operational status of the system, and the quantity of

nodes/devices integrated and commissioned under the respective projects.

(e) Minimum Integrated Device/Node Experience

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

o The Bidder shall demonstrate experience of integrating and operating a

minimum aggregate of:

 500 nodes/devices/meters/sensors

o The count may be cumulative across multiple eligible projects.

(f) Qualifying Period

o The required experience shall pertain to projects executed during the last:

 Three (3) financial years preceding the bid submission date.

(g) Proof of Experience

o The Bidder shall submit documentary evidence such as:

 Purchase Orders/Work Orders,

 Completion Certificates,

 Commissioning Certificates,

 Performance Certificates, or

(h) Right of Verification

 The Purchaser/Employer reserves the right to verify:

o Project credentials,

o Operational status,

o Device count, and

o Client references submitted by the Bidder.

3. Financial Eligibility:

i. The Bidder’s average annual financial turnover during the last three (3) financial

years shall meet or exceed ₹150 Lakhs.

ii. The Bidder's Net Worth shall have been positive in each of the last three (3)

financial years (i.e. 2023-24, 2024-25, and 2025-26).

iii. Financial statements shall be audited and certified by a practicing Chartered

Accountant. (Audited Provisional shall be accepted only for the year 2025-26.)

4. Mandatory Licenses & Registrations:

o Valid GST Registration matching the Bidder’s legal name.

o EPF/ESI Compliance certificates (if applicable).

5. The Bidder shall submit duly signed and stamped undertakings as per all the

Annexure-5, Annexure-8, Annexure-9, Annexure-10 & Annexure-11 mentioned with

6. GEDA reserves the absolute right to physically verify, cross-check, or request third-

party validation. Misrepresentation shall lead to summary rejection and EMD

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6. GENERAL TERMS AND CONDITIONS

1. Definitions and Interpretation

(a) "GEDA" shall mean the Gujarat Energy Development Agency, acting through its Director

or duly authorized representative, with its head office at 4th Floor, Block No. 11 &

Udyog Bhavan, Sector-11, Gandhinagar – 382 017 under Climate Change Department of

Government of Gujarat.

(b) "Bidder" shall mean the entity who has submitted an Offer to GEDA.

(c) "TPI" shall mean Third Party Inspection Agency nominated/authorized by GEDA.

(d) "SIG" shall mean Solar IoT Gateway - the IoT-based hardware device for remote metering

and data communication deployed at solar installation sites.

(e) "DBFOOT" shall mean Design-Build-Finance-Own-Operate-Transfer model. Under this

model, the Bidder shall design, build, finance, own, and operate the deployed SIG

hardware for a period of 10 years from commissioning and go-live, after which all

hardware, SIM accounts, and associated infrastructure shall be transferred to GEDA or

its designated agency.

(f) "SaaS Vendor" shall mean the separately contracted software/SCADA platform provider

under Tender No. GEDA/SIG-SW/2026-27/ . The SIG Hardware Vendor and SaaS Vendor

are distinct entities under separate tenders. GEDA is the coordination authority between

(g) "Go-Live" shall mean successful commissioning of a SIG device with confirmed data

transmission to the SaaS SCADA platform, validated by GEDA/ GEDA authorized Third

2. Deemed Examination, Clarifications and Acceptance

The Bidder shall be deemed to have carefully examined, understood, and accepted all

documents, specifications, terms, and conditions. Queries shall be submitted in writing

within seven (7) calendar days from the date of Tender announcement and in any case prior

to bid submission. No representation, query, or request submitted after this period shall be

entertained. Clarifications issued by GEDA shall be final and binding.

3. Bidder's Responsibility to Understand Scope

Before submission, Bidders shall satisfy themselves fully regarding the scope of work,

technical requirements, site conditions, and all other relevant factors. Ignorance or

misunderstanding shall not constitute a ground for deviation, claim, or dispute.

4. Submission of Offers – Mode and Timelines

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

(a) Online Offers shall be submitted complete via https://tender.nprocure.com.

(b) Physical bid document shall be received at GEDA office only up to the date and time in

the Tender Notice.

(c) Late submissions, shall be summarily rejected.

5. Superscription of Physical Bid Envelopes

Physical bid documents shall be placed in sealed envelopes clearly superscribed with: "

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of Solar/Wind

IIoT Gateway (SIG/WIG), including Communication Infrastructure, for Remote Metering and

Data Communication of GEDA’s Distributed Rooftop Solar Systems and Wind Projects on a

DBFOOT (Design-Build-Finance-Own-Operate-Transfer) Basis, along with Comprehensive

Operation & Maintenance (O&M) and Insurance Coverage for a Period of 10 Years.".

Envelopes not bearing this exact superscription may be rejected without opening.

6. Language of Submission

All information, declarations, and documents shall be submitted in English only. Any

document in another language must be accompanied by a duly certified English translation.

7. Mandatory Signing, Stamping and Authentication

(a) Every page of the Tender document shall be duly signed and stamped by the Bidder or

its authorized signatory.

(b) Any erasure, overwriting, or correction shall be duly initialed, signed, and stamped by the

authorized signatory.

(c) Failure to sign/stamp any page, or unauthenticated changes, shall render the Offer non-

compliant and liable for rejection.

8. Prohibition on Influence

Any attempt by the Bidder, its representative, or agent to influence the decision regarding

the Offer shall render the Offer liable to summary rejection.

9. Relationship with GEDA Employees

The Bidder shall submit an undertaking per Annexure-4 on company letterhead confirming

that none of its partners, directors, or key personnel are related to any GEDA employee.

10. Document Submission, Verification and Evidence

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

(a) Bidders shall submit self-certified copies of all supporting documents.

(b) Original documents must be produced for verification by GEDA officials upon request.

(c) Details of similar work executed only within the last three (3) years, with copies of

work orders and completion certificates, must be attached.

(d) GEDA's verification and acceptance of documents shall be final. Submission of false,

forged, or misleading documents shall attract consequences as mentioned in this tender.

11. "No Deviations" Declaration Mandatory

(a) Any deviation from the Tender bid document shall not be accepted.

(b) Bidder shall submit an undertaking per Annexure-5 regarding no deviation.

12. Consequences of Misrepresentation, Fraud or Withdrawal

If any information is found false, concealed, or incorrect at any stage, the Offer may be

immediately rejected. The Bidder may be debarred from all business with GEDA for three

(3) years, and EMD shall stand forfeited absolutely. This is without prejudice to any other

legal or contractual remedies available to GEDA, including civil/criminal proceedings.

13. Tender Fee and Earnest Money Deposit (EMD)

(a) All Tenders shall be accompanied by requisite Tender Fee and EMD as specified in the

(b) Any Tender not accompanied by adequate Tender Fee and EMD in conforming format

shall be summarily disqualified.

(c) No relaxation or exemption shall be granted except under the Gujarat State Procurement

Policy, 2024 dated 14.03.2024, subject to submission of valid proof. Bidder seeking

exemption shall submit Annexure-13.

(d) EMD shall be submitted as Demand Draft/Bank Guarantee as mentioned in Annexure.

14. Submission of Tender Fee and EMD – Format and Bank List

(a) Tender Document Fee: Demand Draft in favour of Gujarat Energy Development

Agency, payable at Gandhinagar.

(b) EMD: Demand Draft or Bank Guarantee from banks listed in Annexure-Z. Bank Guarantee

valid for six months with two months additional grace period.

(c) Non-compliance shall result in Bid rejection.

15. Return of EMD to Unsuccessful Bidders

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

EMD of unsuccessful Bidders shall be returned without interest after finalization of the

Tender process, subject to deduction of any applicable banking charges.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

16. Offer Validity

Bid validity shall be up to 31st March 2027 or as extended at the discretion of the

Director, GEDA, whichever is later. This shall be binding on the Bidder.

17. Right to Accept, Reject or Modify

(a) GEDA reserves the absolute, sole, and unconditional right to reject any or all Offers, or

to accept any Offer in whole or in part, without assigning any reason.

(b) GEDA further reserves the right to place orders on one or more Bidders.

(c) The decision of GEDA in all matters relating to this Tender shall be final, binding, and

not subject to challenge.

18. No Automatic Entitlement Based on Price

GEDA shall undertake comprehensive evaluation considering technical capability, financial

eligibility, and commercial terms. Submission of the lowest financial offer shall not, in itself,

confer any automatic entitlement to award. GEDA reserves the right to reject any offer

determined to be materially unrealistic, commercially unviable, or non-compliant.

19. Consequences of Failure to Accept Work Order/AT or Withdrawal

If the successful Bidder fails to accept the Work Order/AT within stipulated time, withdraws

its Offer during the validity period, or fails to proceed with the award, GEDA may forfeit

EMD/Security Deposit and debar the Bidder for three (3) years from doing any business with

20. Letter of Intent (LOI)

(a) Discovered Bidders shall be issued a Letter of Intent (LOI).

(b) The LOI is conditional and does not constitute a binding contract. A formal Work

Order/AT shall be issued only upon satisfactory completion of all required formalities.

(c) Failure to comply with LOI conditions within stipulated time may result in automatic

cancellation, forfeiture of EMD, and debarment.

21. Force Majeure

Delay arising solely from events beyond the Bidder's reasonable control may be considered

for extension only if: (i) GEDA is notified by telephone/email/fax within 48 hours; (ii) Written

confirmation with documentary evidence is submitted within seven (7) days of

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

commencement and cessation. Grant of extension is solely at the discretion of the Director,

22. Compliance with Laws, Regulations and Statutory Requirements

(a) The Bidder shall comply with all applicable Central, MNRE, State, and Local laws, statutes,

rules, regulations, and statutory requirements in force from time to time pertaining to

execution, safety, quality, environmental standards, labour welfare, taxation, insurance, and

IoT hardware deployment, including CEA regulations, IT Act 2000, and CERT-In cybersecurity

guidelines applicable to IoT hardware.

(b) The Bidder shall adhere to all administrative directives and site-specific regulations

issued by the concerned government department/institution in whose premises the works

(c) The Bidder's obligations under this Clause are continuing and dynamic, and must be

updated as laws/guidelines are amended.

23. Sub-letting

The Bidder shall not transfer, assign, sublet, or delegate the Contract or any substantial part

thereof to any other party.

24. Default in Performance and Remedial Action by GEDA

If the Bidder neglects to execute the work with due diligence, refuses to comply with

reasonable written instructions, or fails to rectify deficiencies within seven (7) days of

written notice, GEDA shall be at liberty to execute the work through any other agency. Such

costs and expenses shall be recoverable from the Bidder.

25. Access, Inspection and Quality Assurance

(a) GEDA and its authorized representatives/TPI shall have unconditional access at any time

to inspect any work, material, or process undertaken under this Project.

(b) GEDA's acceptance or inspection at any stage shall not relieve the Bidder of its obligations

or liability for latent defects.

26. Authorized Works and Execution

Any work shall be commenced or executed only upon allocation by GEDA. Any work

undertaken without such allocation shall be considered unauthorized and shall not be paid

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

27. Variation, Suspension or Termination

GEDA reserves the right, at any time during the contract period and by written notice, to

stop the work altogether, reduce the scope, or cut down specific portions. Failure by the

Successful Bidder to fulfill any criteria/clause of the Scope of Work, or to complete the work

within stipulated time, shall entitle GEDA to stop, reduce, or terminate the work, and to

debar the Bidder for three (3) years.

28. Cross-Vendor Coordination – SIG Hardware Vendor Obligations

a) The SIG (Solar IIoT Gateway) Vendor (hereinafter referred to as the “Hardware

Vendor”) and the SaaS Vendor shall operate under separate tenders/contracts issued

by GEDA. However, the responsibility for establishment, maintenance, reliability, and

successful transmission of data from the field-installed SIG device up to the

designated software server/MQTT broker endpoint shall solely rest with the

Hardware Vendor.

b) The Hardware Vendor may establish and maintain its own Head-End System (HES),

middleware platform, device management system, MQTT broker logs, historian

database, diagnostic dashboard, communication monitoring tools, or any equivalent

infrastructure for monitoring device health, communication status, packet delivery,

fault analysis, cybersecurity events, and troubleshooting activities between the

deployed SIG devices and the SaaS platform. Such systems may be used by the

Hardware Vendor for operational support, SLA compliance monitoring, dispute

resolution, and communication diagnostics. However, ownership and operational

responsibility of the centralized SCADA/SaaS platform shall remain with the

separately appointed SaaS Vendor.

c) The Hardware Vendor shall provide complete device communication and integration

specifications to GEDA and/or the SaaS Vendor within fifteen (15) days from issuance

of the Work Order. Such details shall include, but not be limited to, device serial

numbers, IMEI numbers, SIM details, communication protocols, MQTT topic

hierarchy, authentication credentials structure, payload mapping, API/interface

specifications, encryption requirements, firmware versions, and any other

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

information necessary for seamless integration. The information shall be submitted

in the JSON structure, API schema, or any other interoperable format prescribed by

GEDA and/or the SaaS Vendor. The Hardware Vendor shall adapt its systems and data

structures to ensure interoperability, scalability, vendor neutrality, and universal

integration across multiple OEMs/vendors under the project ecosystem.

d) The Hardware Vendor shall ensure that all SIG devices securely transmit data in the

prescribed MNRE-compliant JSON format, or such revised format as may be directed

by GEDA, using secure communication mechanisms including TLS/SSL encryption and

authenticated connectivity to the MQTT broker/server endpoint designated by the

SaaS Vendor. All communication protocols, payload structures, timestamp

synchronization, retry mechanisms, and cybersecurity practices shall comply with

applicable standards, tender specifications, and integration requirements.

e) The Hardware Vendor shall participate in all joint integration activities,

interoperability testing, pilot validation, User Acceptance Testing (UAT), cybersecurity

testing, and commissioning exercises with the SaaS Vendor, as coordinated by GEDA.

The Hardware Vendor shall provide necessary technical manpower, backend support,

test devices, APIs, logs, and troubleshooting assistance during such activities to

ensure successful end-to-end system integration.

f) In case of any communication failure, data mismatch, latency issue, data loss, payload

corruption, synchronization issue, or integration dispute between the Hardware

Vendor and the SaaS Vendor, GEDA may undertake technical review, log verification,

packet analysis, backend traceability checks, third-party testing, and/or independent

audit through TPI or any other agency deemed appropriate. The decision and

determination made by GEDA based on such review shall be final and binding on both

g) The Hardware Vendor’s Service Level Agreement (SLA) responsibility for

communication and data transmission shall extend up to successful delivery of valid

data packets to the designated MQTT broker/server endpoint provided by the SaaS

Vendor. Any failure arising due to hardware malfunction, firmware issues,

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

SIM/network connectivity issues, protocol non-compliance, power supply failure, or

unsuccessful transmission before reaching the broker shall be attributable to the

Hardware Vendor. Conversely, any issue occurring after successful receipt of data at

the MQTT broker level, including data processing, storage, analytics, dashboard

visualization, report generation, or cloud application failure within the SaaS platform,

shall be the responsibility of the SaaS Vendor.

h) For dispute resolution and SLA validation purposes, the Hardware Vendor shall

maintain adequate and verifiable communication evidence including MQTT logs,

transmission records, acknowledgements, packet delivery status, timestamp records,

retry logs, historian data, and backend communication trails to establish successful

transmission and broker-level delivery of data.

i) The Hardware Vendor shall not deny, withhold, restrict, delay, encrypt without

authorization, or otherwise obstruct the provision of device specifications,

communication credentials, protocol documentation, APIs, integration details,

diagnostic information, or technical documentation required by GEDA and/or the

SaaS Vendor for successful integration, operation, monitoring, auditing,

maintenance, cybersecurity validation, or project continuity. All such information

shall be provided in a timely manner as directed by GEDA throughout the contract

29. DBFOOT Transfer Obligations

(a) At the end of the 10-year DBFOOT period, the Bidder shall transfer all deployed SIG

hardware - including communication devices, SIM accounts, firmware update access, and

installation documentation to GEDA.

(b) All hardware shall be in working condition at the time of transfer. Non-functional

devices shall be replaced at the Bidder's cost prior to transfer.

(c) The Bidder shall provide full transfer documentation including device inventory,

configuration backup, and operational handover report within 30 days of contract end.

(d) The entire cost associated with transfer of hardware/assets at the end of the DBFOOT

period, including but not limited to decommissioning, dismantling (wherever applicable),

relabeling, SIM ownership/account transfer, configuration handover, documentation, and

all related administrative or logistical activities, shall be deemed included in the quoted

DBFOOT rates. No separate or additional payment whatsoever shall be payable by GEDA for

such transfer activities.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

(e) Upon completion or termination of the DBFOOT period, the bidder/vendor shall transfer

the assets to GEDA in good working condition without claiming any additional charges,

compensation, or financial consideration from GEDA under any circumstances.

(f) Packing, Marking, Transit and Delivery Responsibility

(g) All equipment and materials shall be packed per best industrial practices to

withstand transport, handling, and outdoor storage in tropical conditions.

(h) The Bidder shall be solely responsible for any loss, damage, or deterioration arising

from inadequate packing, transport, or delivery.

30. Publicity, Confidentiality and Intellectual Property Restriction

(a) The Bidder shall not use, publish, or display any photograph, testimonial, case study, or

publicity material relating to this work or GEDA without GEDA's prior written permission.

(b) Bidder shall submit an undertaking per mentioned in Annexure-11.

31. Dispute Resolution and Arbitration

(a) In the event any question, dispute, or difference arises between GEDA and the Bidder(s)

concerning the Work Order—except for matters for which a specific decision-making

mechanism has been expressly provided under this Agreement—either party may notify the

other in writing of such dispute. The dispute shall, in the first instance, be referred to the

Director of GEDA for resolution,

(b) The arbitration proceedings shall be governed by the provisions of the Arbitration and

Conciliation Act, 1996 (or any statutory modification or re-enactment thereof in force at

the time of the dispute), along with the rules made thereunder. The arbitral award shall be

final, binding, and enforceable upon all parties.

(c) Subject to arbitration, the courts at Gandhinagar, Gujarat, shall have exclusive jurisdiction

over any legal proceedings arising from this Project.

GEDA reserves the right to amend, modify, or supplement the Tender Document at any time

by issuing a corrigendum/addendum. Bidders are advised to regularly check the website for

33. Project Reporting and Monitoring Compliance

The Bidder shall submit all reports, progress updates, device communication logs, technical

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

data, and compliance certificates as required by GEDA within specified timelines. Failure

shall constitute a material breach entitling GEDA to withhold payments, impose penalties,

or initiate termination proceedings.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

7. SCOPE OF WORK AND TECHNICAL SPECIFICATIONS

1. DEFINITIONS:

a. “Bid” shall mean the bid submitted by the Bidder in response to this “Tender

for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure,

for Remote Metering and Data Communication of GEDA’s Distributed Rooftop

Solar Systems and Wind Projce-Own-Operate-Transfer) Basis Including

Years Comprehensive O&M and Insurance Coverage” with Tender No. GEDA/

SOLAR IOT GATEWAY (SIG)/2026/

b. “Bidder” shall mean a Company or an Individual submitting the Bid in response

to this Tender. Any reference to the Bidder includes a Company or an Individual

including its successors, executors and permitted assigns severally, as the

context may require.

c. “SLA Date” shall mean 00:00 hours (midnight) of the 5th calendar day of each

month, which shall serve as the official cut-off for measurement and

evaluation of SLA performance for the immediately preceding calendar month.

d. “Calendar Month” shall mean the month January to December of a calendar

e. “Contract” or “Contract Agreement” shall mean the contract signed between

the GEDA and the Successful Bidder to execute the entire Scope of Work as

given in this Tender;

f. “Contractor” shall mean the Successful Bidder whose Bid to perform the

Contract as per this Tender has been accepted by the GEDA and is named as

such the Contract Agreement, and includes the legal successors or permitted

assigns of the Contractor;

g. “Solar IoT Gateway” shall mean the complete SMC box which contains major

components viz. Generation Energy Meter, IoT based DCU/RMS for data

acquisition, monitoring, Communication and control, power and control

wiring, necessary safety protection etc.

h. “Successful Bidder” shall mean the Bidder whose Bid is found to be responsive

and is eligible to sign the Contract Agreement as per the terms and conditions

of this Tender;

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

i. “DBFOOT (Design, Build, Finance, Own, Operate, and Transfer) Model” shall

mean a project delivery and service model under which the selected

bidder/service provider shall be responsible for the end-to-end lifecycle of the

IoT-based metering system, including:

 Design of the complete solution architecture, including metering

devices, communication infrastructure, data acquisition systems, and

software platforms;

 Build/Procurement, installation, and integration of all hardware,

communication networks, and applications required for the system;

 Finance the entire project, including capital expenditure on devices,

software, and associated infrastructure;

 Own the assets during the contract period;

 Operate and Maintain the system to ensure continuous data

acquisition, communication, monitoring, reporting, and compliance

with defined SLAs/KPIs; and

 Transfer the complete system, including assets and operational rights,

to the client/utility in a fully functional and serviceable condition at the

end of the contract period.

j. Industrial Internet of Things (IIoT)” shall mean an integrated ecosystem of

industrial-grade hardware, communication devices, sensors, gateways,

controllers, cloud/server platforms, and software applications enabling secure

acquisition, transmission, storage, analysis, visualization, and remote

management of operational data from field devices and systems through

wired/wireless communication networks for monitoring, automation,

diagnostics, reporting, and intelligent operational control.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

2. INTRODUCTION

The Gujarat Energy Development Agency (GEDA) has facilitated installation of rooftop

solar systems on approximately 4,637 Government buildings across the State up to

March 2025, and the number of such installations is continuously increasing year after

year in line with the State’s renewable energy objectives.

Considering the expanding deployment of distributed rooftop solar systems and the

increasing requirement for centralized supervision, monitoring, analytics, and

operational management, GEDA intends to implement an integrated remote

monitoring and communication infrastructure under this tender. The approximate

estimated value of work envisaged under this tender for FY 2026–27 is around INR

2.75 Crore; however, the actual scope of work may vary depending upon project

requirements, site readiness, and future additions during the contract period.

The centralized monitoring system is envisaged to address, inter alia, the following

operational and technical challenges:

 Difficulty in monitoring real-time performance and energy generation data

 Delayed identification of faults, communication failures, and system

 Lack of automated alerting and event-based notifications

 Inefficient management of geographically distributed site-specific technical

 Absence of centralized analytics and consolidated performance data for

administrative and decision-making purposes

 Need for scalable monitoring infrastructure to accommodate future growth of

rooftop solar installations across the State

a) IoT-Based Monitoring & Data Communication Requirements

The system shall be designed as a robust IoT-enabled data acquisition and

communication platform with the following capabilities:

 Continuous IoT-based data acquisition from Energy Meter and/or Inverters

 Reliable device-to-gateway and gateway-to-server communication architecture

 Real-time data transmission with minimal latency

 Standardized data formatting and publishing in JSON format for seamless software

 Device connectivity monitoring, including online/offline status and health

 Time-synchronized data capture with appropriate timestamping for all data packets

 Secure and encrypted data communication protocols

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

b) Core IIoT System Components

The implementation shall include:

 IIoT Gateway (SIG) for data collection, edge processing, and communication

 Interoperable communication interfaces/protocols (e.g., Modbus, MQTT, HTTP, etc.)

 Data normalization and structuring engine to convert raw device data into standard

 Cloud-based or GEDA-hosted server infrastructure for receiving and storing IIoT data

 APIs/Web services for seamless data exchange with third-party or GEDA software

 Buffering and store-and-forward mechanism to prevent data loss during

communication failures

c) Key Objectives

 To capture, standardize, and publish data from all connected devices in uniform

 To ensure high availability and integrity of IIoT data streams

 To enable easy integration with software platforms through standardized APIs and

Figure 1: Schematic of Solar IoT Gateway

3. SCOPE OF WORK

3.1. Overall Scope

3.1.1. Bids are invited under the Design, Build, Finance, Own, Operate and Transfer

(DBFOOT) model for a period of 10 (Ten) years for the design, supply, financing,

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

installation, testing, commissioning, ownership, operation, and maintenance of

Solar IoT Gateway (SIG) along with Communication System Hardware for Remote

Metering and Data Communication of Distributed Grid-Connected Solar Rooftop

Systems of GEDA. The scope of work shall include comprehensive Operation &

Maintenance (O&M), replacement/repair of defective components, support to

software agencies, communication connectivity, and Insurance Coverage against

Natural Calamities and Material Theft throughout the contract period. The entire

work shall be executed on a comprehensive DBFOOT basis.

3.1.2. The Bidder shall be responsible for acquainting oneself with all terms and

conditions of this Tender, site location(s), and conditions prior to quoting. In case

of any safety or compliance issues foreseen by Bidder, the same shall be

immediately reported by the Bidder to the Client.

3.1.3. The Bidder shall fully acquaint itself with the requirements of the proof of

concept (PoC) and demonstrate the same as per the terms and conditions of

this Tender. All components and works shall adhere to relevant Indian and

International Standards, State and Central policies and regulations, and all

statutory provisions under the Indian law.

3.1.4. The Contractor shall comply with all Boundary Conditions specified in this

Tender, including but not limited to coordination, interfacing, and integration

with the existing PV system installer/agency for successful installation,

commissioning, operation, and integration of the Contractor’s hardware at site.

The scope shall also include arranging necessary access to the rooftop/site,

identification of suitable installation location, dismantling/opening of existing

cable connections wherever required, installation of the Solar IoT Gateway (SIG)

in-line with the existing system through proper termination using suitable lugs,

glands, ferrules, connectors, and associated accessories, while ensuring

minimum interruption to the existing system operation. The Contractor shall, as

far as practicable, avoid intermediate cable joints and maintain continuity,

safety, reliability, and neat workmanship in accordance with applicable

standards and approved engineering practices.

3.1.5. The Contractor shall be solely and entirely responsible for the execution of the

Scope of Work under the Design, Build, Finance, Own, Operate and Transfer

(DBFOOT) model for a period of 10 (Ten) years, strictly in accordance with the

provisions of this Tender, including its specifications, schedules, drawings,

conditions, and annexures. The Contractor shall be fully responsible for detailed

design, engineering, financing, procurement, supply, transportation, installation,

testing, commissioning, operation, and maintenance of the complete system.

3.1.6. The Contractor shall further guarantee and remain responsible throughout the

contract period for the quality, reliability, performance, safety, workmanship,

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

and satisfactory operation of all equipment, materials, software, communication

systems, and completed works, including correctness of designs and drawings,

timely delivery of materials, successful integration with existing systems, periodic

testing, preventive and breakdown maintenance, replacement of

defective/faulty components, communication uptime, and comprehensive

operation & maintenance services for the entire 10-year DBFOOT period.

3.1.7. INSURANCE: The Contractor may, at its own discretion, obtain and maintain

insurance coverage for the entire project and all associated equipment, systems,

materials, and assets under the DBFOOT model for a period of 10 (Ten) years,

including coverage against natural calamities, fire, lightning, flood, cyclone,

earthquake, storm, theft, burglary, vandalism, riots, accidental damages, transit

damages, third-party liabilities, and any other unforeseen events causing loss or

damage to the Solar IoT Gateway (SIG), communication systems, associated

hardware, software, or related infrastructure.

However, irrespective of whether insurance is obtained or not, the Contractor

shall remain solely and entirely responsible for the safety, security, protection,

operation, restoration, replacement, repair, and uninterrupted performance of

the complete system during the entire contract period. Any loss, damage, theft,

deterioration, or failure arising due to any reason whatsoever shall be

rectified/replaced by the Contractor at its own cost and risk without any

financial implication to Gujarat Energy Development Agency (GEDA).

Under no circumstances shall GEDA be liable for any compensation,

reimbursement, insurance premium, claim settlement, damages, losses, or

financial implications arising out of such incidents. No claim whatsoever in this

regard shall be entertained or payable by GEDA at any stage during or after the

contract period.

3.1.8. The Contractor shall be responsible for undertaking all applications and

obtaining all approvals, permissions, etc. in order to successfully complete the

Scope of Work. In cases where Client’s/ GEDA’s certifications are required, the

Contractor shall inform the Client/ relevant GEDA and provide the requisite

formats for such certificates well in advance.

3.1.9. The Contractor shall adhere to best practices in terms of safety, quality, and

performance while undertaking the Scope of Work, and the same shall be

included within the Contractor’s contract price.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

3.1.10. Submission of brochures, technical specifications, designs, datasheets, etc. at

the time of Bidding does not imply approval of the same. All such approvals shall

be taken up separately at the time of project execution by the Contractor.

3.1.11. All final specifications, designs, drawings bill of material, quality assurance

plan, etc. shall be inspected, examined, and approved by the Client or any Third

Party Inspection Agency appointed by the GEDA.

3.2. Scope of work for Remote Metering and Communication system

3.2.1. The Contractor shall supply the Solar IoT Gateway (SIG) with following

hardware components and configuration requirements mentioned below, along

with necessary licenses (wherever required) to the Client:

(a) Unidirectional DLMS energy meter with Current Transformers (wherever

applicable), SMC Enclosure, IoT DCU/RMS, Surge Protection devices,

Internal Power and Communication wiring etc. as per the detailed

Technical Specifications mentioned.

(b) An Industrial Internet of Things (IIoT) gateway consisting of device

communication interfaces (inputs/ outputs), microprocessors, internal

data storage, remote communication modules and auxiliary features and

compatibility as per detailed specification in this section.

(c) A comprehensive Solar IoT Gateway (SIG) shall be provided in a robust SMC

enclosure, designed to house all required components, including energy

meters, IoT DCU devices, internal power and communication wiring, bus

bars, Surge Protection Devices (SPD), and other associated auxiliary

equipment, in accordance with the specifications outlined in this section.

The Contractor shall be responsible for the design, manufacture, supply,

and on-site deployment of the Solar IoT Gateway (SIG). All components

shall be properly installed and integrated within the enclosure as per

approved drawings, ensuring a fully assembled, factory-tested, and plug-

and-play configuration. The complete Solar IoT Gateway (SIG) shall be

delivered, installed, and commissioned at site as a single integrated unit,

meeting all requirements specified in this tender.

(d) The DCU shall be equipped with the RJ45 Ethernet port to access of the

data for monitoring and downloading through wired connections

whenever required and specifically, in case of failure to get the data over

the air (through Wi-Fi).

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

3.2.2. The Contractor shall undertake the integration, operation, and maintenance

of the above components along with its proof of concept (PoC).

3.2.3. The Contractor shall submit an Approach Paper detailing the proposed

hardware, system architecture, technical compliance, designs, drawings,

specifications, features, communication methodology, installation procedures,

quality assurance methodology, testing procedures, implementation timelines,

supply schedules, operation & maintenance strategy, and all other relevant

details pertaining to the execution of the work.

Further, the Contractor shall prepare and submit prototype/sample units of the

Solar IoT Gateway (SIG) for each applicable capacity/category as specified in the

tender. The prototype/sample SIG units shall be demonstrated and submitted

for inspection, testing, and approval by Gujarat Energy Development Agency

(GEDA) prior to commencement of bulk supply and installation. Any

modifications, improvements, corrections, or changes suggested/approved by

GEDA during evaluation of the prototype/sample shall be mandatorily

incorporated by the Contractor in the final design, hardware, software, and

associated systems before mass deployment.

No bulk procurement, supply, installation, or commissioning activities shall be

undertaken without prior written approval of the Approach Paper and

prototype/sample SIG by GEDA.

3.2.4. The Solar IoT Gateway (SIG) shall contain one 1-Ph/3-Ph energy meters to

measure the electrical parameters and energy of the grid connected Solar PV

Installation of the consumer. These energy meters shall confirm the DLMS

protocol with RS232 communication hardware as per the detailed technical

specifications mentioned in the annexures of this technical specifications. There

shall be three separate type of Solar IoT Gateway (SIG)s as mentioned in this

technical specifications on the basis of the contract load of the participating

consumers. The detail requirement of various types of the Solar IoT Gateway

(SIG) shall be given by the GEDA to the contractor. The Bidder shall consider

these requirements for manufacture and supply the Solar IoT Gateway (SIG) as

per the requirement submitted by the GEDA. The SMC enclosure made Solar IoT

Gateway (SIG) shall also consist of one IIoT base ( DCU/RMS, Bus Bars, Power,

and Control wiring, Plastic Encapsulated Ring Type Current Transformers of

100/5 OR 200/5 Amps, other auxiliaries etc. The bidder is required to refer the

relevant annexure of this technical specification supplied with this tender for

further understanding.

3.2.5. There shall be the requirement of separate barcode for all the components of

the Solar IoT Gateway (SIG) to master the equipment details. Solar IoT Gateway

(SIG). The master data of the Solar IoT Gateway (SIG) and its relevant meters shall

be updated using the barcode only. The standard design and drawing of the Solar

IoT Gateway (SIG) and its component arrangement shall be in the scope of the

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

bidder. However, due consideration shall be given during the design preparation,

adequate safety clearance between phases and between Phase to earth shall be

required to be maintained. Bidder is also required to consider other specific

design requirements as per the technical specifications.

3.2.6. The Solar Generation meter, Plastic Encapsulated Current Transformers shall

all be required to test and seal in the metering testing laboratory of the GEDA.

The GEDA reserves the right to ensure testing of these meters through any Meter

Testing Laboratory as per prevailing testing practices and return the tested

meters and/or CTs to the company for further installation process. The supplier

shall confirm the configuration and communication of all the individual

components of the Solar IoT Gateway (SIG) during the manufacturing and

assembling. The whole Solar IoT Gateway (SIG) shall be in the form of “Plug and

3.2.7. In the event of any defect, malfunction, abnormality, communication failure,

or operational error in the energy meter, Solar IoT Gateway (SIG), associated

CT/PT circuitry, or related communication and metering system supplied under

the DBFOOT model, the Contractor shall be solely responsible for identifying,

rectifying, repairing, recalibrating, or replacing the defective

equipment/components without any additional cost to Gujarat Energy

Development Agency (GEDA) during the entire contract period of 10 (Ten) years.

Such defects/errors shall include, but not be limited to:

 Non-recording or incorrect recording of energy parameters;

 RTC (Real Time Clock) drift beyond permissible limits;

 Incorrect display or recording of voltage, current, power factor,

frequency, import/export energy, MD, or other metering parameters;

 CT/PT polarity issues, ratio errors, wiring errors, or calibration

 Meter tamper indication abnormalities or failure of tamper logging

 Failure of data communication, remote connectivity, or data

 Corruption/loss of meter data, event logs, or load survey data;

 Hardware/software malfunction, hanging, rebooting, synchronization

failure, or abnormal operation;

Failure to comply with applicable standards, specifications, or functional

requirements specified in the tender.

The Contractor shall attend and resolve such issues within the timelines

specified under the Service Level Agreement (SLA). Wherever rectification is

not feasible or repeated failures are observed, the Contractor shall replace the

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

defective meter/Solar IoT Gateway (SIG)/associated equipment with new and

fully functional equipment of equivalent or higher specifications without any

extra cost to GEDA.

In the event of failure, delay, or non-replacement/non-restoration by the

Contractor within the prescribed SLA timelines, the applicable SLA

penalties/liquidated damages as specified in the tender document shall

become applicable and recoverable from the Contractor.

3.2.8. Under the DBFOOT model for a period of 10 (Ten) years, the Contractor shall

be solely responsible for selection, procurement, configuration, deployment,

operation, management, monitoring, maintenance, replacement, and continuity

of the communication system and associated SIM connectivity required for

uninterrupted data communication between the Solar IoT Gateway (SIG), energy

meters, and central/server systems. The Contractor shall ensure reliable end-to-

end communication and data availability throughout the entire contract period.

The selection of communication technology, GSM/GPRS/4G/5G/NB-IoT or any

suitable communication medium and data carrier shall be carried out

considering long-term reliability, network availability, scalability, cybersecurity,

and uninterrupted data communication during the entire 10-year DBFOOT

period. The Contractor may procure Industrial Grade SIM Cards and

communication services through suitable arrangements with Telecom/Internet

Service Providers; however, the complete responsibility for communication

performance, recurring charges, and service continuity shall remain solely with

the Contractor.

The following activities shall mandatorily form part of the Contractor’s scope

under the DBFOOT model:

3.2.8.1. Selection of Telecom/Internet Service Provider(s) based on signal

strength, network reliability, uptime, and data availability at the respective

installation locations. In case of poor or unreliable signal strength, the

Contractor shall deploy dual SIM, multi-network, or any alternative

communication arrangement to ensure uninterrupted connectivity with

3.2.8.2. Procurement, configuration, activation, integration, testing, operation,

management, replacement, suspension, reactivation, and termination of

SIM cards and communication services throughout the contract period.

3.2.8.3. Complete SIM inventory management including but not limited to

installed SIMs, spare SIMs, replaced SIMs, defective SIMs,

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

blocked/suspended/terminated SIMs, communication status, usage

records, and associated asset tracking.

3.2.8.4. Maintenance and updating of SIM inventory, communication asset

details, and related information in the Asset Management/Monitoring

Software or any portal/platform designated by Gujarat Energy

Development Agency (GEDA).

3.2.8.5. Ensuring compliance with prevailing regulations, guidelines, and

statutory requirements issued by DoT, TRAI, or any other competent

authority related to SIM usage, communication services, IoT connectivity,

cybersecurity, and telecom operations.

3.2.8.6. Pre-configuration, provisioning, testing, and activation of SIM cards

prior to installation in the Solar IoT Gateway (SIG), including coordination

with Telecom Service Providers wherever required.

3.2.8.7. Replacement of faulty, damaged, inactive, obsolete, or poor-

performing SIM cards and communication devices during the entire

contract period without any additional cost to GEDA.

3.2.8.8. Timely payment of all recurring charges including but not limited to SIM

charges, data plans, connectivity charges, subscription charges, telecom

service charges, platform charges, roaming charges, communication license

fees, or any other charges associated with communication services during

the complete 10-year DBFOOT period. No separate

reimbursement/payment shall be made by GEDA towards such recurring

3.2.8.9. Continuous monitoring of communication health, signal strength,

network availability, online/offline status of devices, data latency,

communication failures, server connectivity, and overall end-to-end data

availability through suitable monitoring tools/software. The Contractor

shall proactively identify and rectify communication failures to ensure

uninterrupted operation of the system.

3.2.8.10. The Contractor shall comply with the applicable Service Level

Agreement (SLA), uptime requirements, communication availability criteria,

and penalty provisions specified in the tender document. Any

communication failure, prolonged downtime, non-availability of data, non-

payment of recurring charges, SIM malfunction, or failure to restore

connectivity within prescribed timelines shall attract SLA penalties as

applicable under the contract.

3.2.8.11. The SIM cards, communication architecture, provisioning mechanism,

and data communication system deployed under the project shall comply

with the prevailing Machine-to-Machine (M2M) communication guidelines,

cybersecurity requirements, telecom regulations, and technical standards

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

issued by the Ministry of New and Renewable Energy (MNRE), Department

of Telecommunications (DoT), Telecom Regulatory Authority of India

(TRAI), and any other competent authority from time to time, including

applicable guidelines under the PM Surya Ghar Yojana or any subsequent

amendments thereof.

3.2.8.12. The Contractor shall ensure that all SIM cards used in the Solar IoT

Gateway (SIG) are suitable for industrial/M2M applications and are

configured for secure, reliable, and uninterrupted machine-to-machine

communication. The Contractor shall also ensure proper remote SIM

management, device binding, cybersecurity compliance, data security,

network authentication, and long-term connectivity support as mandated

under applicable M2M guidelines and regulatory provisions throughout the

entire 10-year DBFOOT contract period.

3.3. PROOF OF CONCEPT (POC) FOR REMOTE METERING SYSTEM:

3.3.1. The Proof of concept is to establish successful communication between Energy

meter, IoT gateway device to be used in the Solar IoT Gateway (SIG),

communication between the IoT Gateway device and HES as per MNRE guideline

OR with their own HES for all types of Energy meters having RS 232 ports with

DLMS protocol. The set of energy meters and other component shall be as per

the Table-1 mentioned here under. The Bidder shall require to establish proof of

functionalities for all the time as under for following parameters.

3.3.2. Following different Communication Modes shall be demonstrated during PoC

as per attached MNRE Guidelines.

3.3.2.1. Push on Periodic Interval: In this mode IoT DCU/deployed RMS shall

transmit data of multiple devices and sensors on different configurable time

intervals such as Inverter data at every 15 minutes or its multiple, Energy

Meter data at every 15 minutes or its multiple. During the PoC, bidder is

also required to confirm the communication between the RMS/IoT DCU and

GEDA portal OR HES in case of GPRS connectivity failure and history backfill

as per the USER requirement for priority/criticality of data. RMS needs to

process the acknowledgement published by the portal in such a way that

missing data index shall be prepared and need to publish as per history

backfilling requirement of portal. The backfilling priority shall be decided by

GEDA. The reference parameters to be demonstrated are mentioned for

understanding of the bidder.

iii. Voltage of all 3 phases

iv. Current of all 3 phases

v. Power Factor

vi. Line Frequency,

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

vii. Date & Time

3.3.2.2. Push on Event: IIoT based RMS shall detect various configurable alarm

or event conditions such as SPV Generation ON / Off Status, Inverter On/Off

Status, Fault or Trip status etc. and it shall transmit data immediately to the

IIoT based RMS needs to process the acknowledgement published by the

portal in such a way that missing data index shall be prepared and need to

publish as per history backfilling requirement of Portal.

3.3.2.3. On-Demand Read: In this mode, User will send command to IIoT based

RMS to get data as and when required and RMS will send the required data

to server immediately. The reference parameters to be demonstrated are

mentioned for understanding of the bidder.

i. Meter Information

ii. Load Survey

iii. Tamper information

iv. Billing Data/ Billing History including time zone

3.3.2.4. On-Demand Write: The Contractor shall provide the capability for

secure remote configuration, parameter writing, command execution, and

device operation through the centralized/universal software

platform/portal supplied under the project. The system shall support on-

demand remote write functionality for updating device configurations,

communication settings, firmware parameters, operational thresholds,

synchronization parameters, control logic, and other configurable settings

of the Solar IoT Gateway (SIG), energy meter interface, communication

modules, and associated field devices as required by Gujarat Energy

Development Agency (GEDA) during the entire 10-year DBFOOT period.

The system shall further support secure remote command execution and

operation of associated Digital Output (DO)/relay/control ports for device

operation, switching, control actions, enable/disable functions,

reset/restart commands, alarm acknowledgment, and any other authorized

operational requirements as specified by GEDA.

All remote write and control operations shall be carried out through

authenticated and role-based access mechanisms with proper

cybersecurity provisions, command validation, encryption, audit trails,

event logging, timestamping, user tracking, and acknowledgment

mechanisms to ensure traceability and operational security.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

The Contractor shall ensure that the remote configuration and command

execution functionality operates reliably without adversely affecting

metering accuracy, communication integrity, data security, or system

stability. Any malfunction, failed command execution, unauthorized

operation, or configuration-related issue shall be rectified by the Contractor

without any additional cost to GEDA, and the applicable SLA provisions shall

apply in case of non-performance or delayed restoration.

3.3.3. Location of POC: -

The Location for establishing POC shall be decided and conveyed to all the

eligible bidders of the bid.

3.3.4. Components of POC:

The bidder shall be required to attend the PoC with one Solar IoT Gateway (SIG)

of each capacity set as mentioned below in Table-1 Solar IIoT Gateway (SIG)

The Solar IoT Gateway (SIG) for PoC shall comprise of one Tariff Energy meters

with RS 232 port and DLMS communication protocol as per specifications

provided by DISCOMs under GUVNL, IoT DCU/RMS with GPRS sim card with

internet bandwidth and any other required equipment to carry out the PoC.

The PoC shall be conducted and demonstrated in such method that single IoT

base DCU shall communicate with energy meter and Inverters with the web-

based HES using GPRS communication. –The Communication protocol and

message formats of RMS system shall be in line with the MNRE/GEDA

Sr. No PoC Components Qty.

Uni directional-LT-1PH-Whole current meter(5-30)A, DLMS,

with RS 232 Port from the registered vendor of DISCOMs of

Uni directional-LT-3PH-Whole current meter(10-60)A, DLMS,

1 with RS 232 Port from the registered vendor of DISCOMs of 1 No

Uni directional-LT-3PH-CT Operated meter(100/5 A, 200/5 A)

DLMS with RS 232 Port from the registered vendor of

DISCOMs of GUVNL.

2 IoT DCU as per Technical Specifications with GPRS SIM card 1 No

SMC Box enclosure from the registered vendor of DISCOMs

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

Surge Protection Device as per technical specifications 01 No

Other accessories, Internal Power and Communication wiring As

5 etc. required

3.3.5. Period of the POC:-

a. There shall be the period of total 07 days for the establishment of PoC by the

Bidder. Three fare chances shall be given to the bidder for establishment of

PoC within the period of 7 days from the first trial.

For the demonstration of the PoC, the bidder, if requires may come with an

authorized representative of the vendor of the meter manufacturer on the

b. The bidder who will not remain present to establish the POC during the period

of the POC will be declared as disqualified.

c. However, depending upon the number of participating bidders, GEDA may

allocate a suitable date and time slot to each bidder for establishment and

demonstration of the Proof of Concept (POC). The POC demonstration shall

be conducted during GEDA office working hours only. The bidder shall be

required to successfully establish the POC within the allotted schedule and

permissible number of attempts as specified above.

d. GEDA decision in POC will be final. Any request regarding extension in the

period of POC will not be entertained.

3.3.6. Successfulness of POC:-

Within the scheduled time period of 7 days from the date of PoC for the

respective bidder given by the GEDA either in the tender notice or separately,

the bidder shall require to establish the proof of concept described in details

as above between the IoT Gateway Device, Energy meter, Inverters. Thereafter

between the IoT DCU/RMS and GEDA portal - Device Integration Software

Module OR their own HES as per the requirement. The bidder shall be require

to establish the PoC with all 3 type of meter procured by the GEDA with RS

and DLMS protocol to check the interoperability competencies of the IoT

DCU/RMS. If the bidder fails to establish the PoC as per above criteria before

the GEDA Committee, the bidder will be disqualified and his/her price bid shall

not be opened for further evaluation. Further Two fare chances shall be given

to the bidder if he fails to perform POC in first attempt; there after the

respective bid shall be treated as cancelled.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

4. ATMOSPHERIC PARTICULARS: -

The atmospheric conditions under which the Solar IoT Gateway (SIG) should perform

continuously and successfully are mentioned as below.

Maximum Ambient Air Temperature 50° C

Minimum Ambient Air Temperature 0° C

Maximum daily average ambient air

Maximum humidity 95%

Altitude above M.S.L. (maximum) 1000Mtr

Average annual rainfall (mm)

Max. wind pressure(Kg/sqm)

Seismic level (Horizontal accn.) 0.3 g

Iso-ceraunic level(Days per Year)

Average thunderstorm days per annum

Wind pressure 200 KG/M2

Note: The climatic conditions are prone to wide variations in ambient conditions

and hence the equipment shall be of suitable design to work satisfactorily under

the System conditions.

5. APPLICABLE STANDARDS:-

Unless otherwise specified elsewhere in this Specification, the components to be used in the

Solar IoT Gateway (SIG) viz. LT PVC insulated flexible aluminium cable and Bus Bars, IoT

DCU/RMS, Energy Meter, control wires and other associated accessories shall conform to the

latest revisions and amendments thereof to the following standards. Specifically, for the

standard procurement by GEDAs for energy meters, Current Transformers, SMC etc. bidders

are requested to refer their relevant annexures enclosed with this technical specification for

detailed technical specifications and relevant standards.

Sr No Applicable IEC/IS Description

Polyvinyl chloride (PVC) insulated unsheathed and

sheathed cables/cords with rigid and flexible conductor

2 IS: 8130 Conductors for insulated electric cables and flexible cords

Electromagnetic compatibility: Testing and measurement

techniques - Electrostatic discharge immunity test

Electromagnetic compatibility (EMC) - Part 4-3: Testing and

4 IEC 61000-4-3 measurement techniques - Radiated, radio-frequency,

electromagnetic field immunity test

Electromagnetic compatibility (EMC):Testing and

5 IEC 61000-4-4 measurement techniques - Electrical fast transient/burst

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

Electromagnetic compatibility (EMC):Testing and

measurement techniques - Surge immunity test

Electromagnetic compatibility (EMC):Testing and

7 IEC 61000-4-6 measurement techniques - Immunity to conducted

disturbances, induced by radio-frequency fields

Electromagnetic compatibility (EMC)-Testing and

8 IEC 61000-4-8 Measurement Techniques - Power Frequency Magnetic

Field Immunity Test

Electromagnetic compatibility (EMC): Testing and

9 IEC 61000-4-11 measurement techniques - Voltage dips, short interruptions

and voltage variations immunity tests

Central Electricity Authority (Technical Standards for

CEA Standard for

10 Communication System in Power System Operation)

Communication system

Regulations, 2020”

EN 55022 / CISPR 22/ Information technology equipment - Radio disturbance

CISPR 32 characteristics - Limits and methods of measurement

12 Surge Arrestor for AC system

All Indian Electricity Rules/ Bills amended up to date applicable for clearances, safety and

operation of the equipment

6. TECHNICAL SPECIFICATION: -

6.1. General Arrangement of Solar IoT Gateway (SIG) :

6.1.1. The general arrangement of the various components of the Solar IoT Gateway

(SIG) is in line with the schematic given in Figure 2. There shall be three different

types of Solar IoT Gateway (SIG) as per the contract load of the participating

consumers. The Solar IoT Gateway (SIG) shall consist of Generation meter,

Current Transformers (if applicable), IoT based DCU with requisite terminals and

ports, Surge Protection Device, aluminium bus bars of adequate current ratings,

device mountings arrangement, internal power wiring with aluminium

conductor, control and communication wiring for the measurements, monitor,

control and data communication, auxiliary equipment, etc.

6.1.2. The Solar IoT Gateway (SIG) shall be designed as a compact, robust, and field-

deployable unit, housed within a weatherproof SMC (Sheet Moulded

Compound) enclosure suitable for outdoor installation and capable of

withstanding site environmental conditions.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.3. The SIG shall be capable of flexible installation and may be mounted at an

appropriate location based on site conditions, including:

 Wall mounting within consumer premises or plant area before DISCOM

 Installation on structural members such as angle/channel of SPV system,

preferably near the ACDB (AC Distribution Board) or downstream of the

The final mounting location shall ensure ease of access, safety, and optimal

communication performance.

6.1.4. The SIG shall be installed in-line with the electrical system, wherein:

 The existing outgoing cable from ACDB/Inverter should be safely terminated

and routed through the SIG unit

 Proper incoming and outgoing connections shall be established within the SIG

 All terminations shall be carried out using appropriate size lugs, properly

crimped using standard tools, ensuring Firm and secure connections,

Elimination of loose contacts, Prevention of overheating, sparking, or fire

 The installation shall ensure neat and properly fastened cable routing with

proper dressing and clamping.

6.1.5. In cases where existing service cables are inadequate or unsuitable:

The cables may be extended or replaced, as required. Such extension/replacement

shall be executed in a manner that avoids intermediate joints or weak connections.

Wherever unavoidable, joints shall be done and executed using approved jointing

techniques with proper accessories ensuring safety and reliability with prior approval.

6.1.6. The complete installation shall comply with:

 Applicable electrical safety standards

 Proper earthing and insulation practices, wherever applicable

 Fire safety norms and best engineering practices

6.1.7. The SIG installation shall not adversely affect the existing electrical system,

inverter performance, or safety of the installation.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.8. The Solar IoT Gateway (SIG) shall be designed as an “easy-to-use, plug-and-

play” system, ensuring:

 Minimal installation complexity

 Quick deployment at site

 Reduced dependency on specialized tools or extensive rewiring

 Ease of maintenance, replacement, and scalability

 Proper tagging and marking of each components

6.1.9. The Solar IoT Gateway (SIG) shall be designed, manufactured, and supplied to

ensure full compatibility with various categories and ratings of energy meters,

along with compliance to enclosure standards prescribed by the concerned

DISCOMs under GUVNL.

6.1.10. The SIG shall be suitably designed/configured to interface with the following

types of energy meters:

 5–30 Amp Whole Current Meter

 10–60 Amp Whole Current Meter

 CT Operated Meters: 100/5 Amp or 200/5 A

6.1.11. The SIG shall ensure accurate data acquisition from all such meter types, with

appropriate handling of measurement scaling factors, CT ratios, and

communication protocols.

6.1.12. The SIG shall be housed in a high-quality SMC (Sheet Moulded Compound)

enclosure, conforming to the specifications, guidelines, and approved standards

of the respective DISCOMs under GUVNL.

6.1.13. The overall design of SIG, including meter compatibility and enclosure, shall

 Applicable DISCOM specifications under GUVNL

 Relevant Indian standards and safety regulations

 Best industry practices for durability, safety, and long-term performance

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.14. The Solar IoT Gateway (SIG) shall have a door sensor provided in the inner door

to track the opening of the Solar IoT Gateway (SIG). The IoT DCU shall log these

events as alerts and communicate to GEDA Portal.

6.1.15. The Solar IoT Gateway (SIG) shall be equipped with adequate monitoring,

indication, and alert mechanisms to ensure transparency in operation, ease of

troubleshooting, and real-time visibility of system status.

6.1.16. Door Sensor and Tamper Monitoring :

The SIG shall be provided with a door sensor mounted on the inner side of the

enclosure to detect any unauthorized or accidental opening of the unit.

a) Every instance of door opening/closing shall be automatically logged by the

IoT DCU with timestamp

b) Such events shall be treated as tamper/alert events

c) The IoT system shall ensure real-time or near real-time communication of

these alerts to the GEDA portal

d) Historical logs of door events shall be securely stored and retrievable for

audit and monitoring purposes.

6.1.17. Status Indication System of IoT

Each SIG shall be equipped with a clear visual indication system, either through:

Dedicated LED indicators, or An LCD/LED display panel, to provide real-time

operational status and facilitate quick fault identification at site.

6.1.18. Mandatory Indications / Display Parameters

The SIG shall provide clear indication of the following operational parameters:

a) Power Status (Mains/Battery):

Indication of whether the IoT Gateway is powered ON/OFF

b) Status of main supply and internal power system of IoT

c) Meter Communication Status:

Indication of whether the gateway is successfully communicating with the

d) Inverter Communication Status:

Indication of whether the gateway is communicating with the inverter system

e) Network Connectivity (GPRS/4G/5G):

Availability and strength/status of communication network signal

f) Data Transmission Status (Server Communication):

Indication of whether data is being successfully transmitted to central server

/ head-end system

g) Local Connectivity (BLE/Wi-Fi):

Status of local wireless communication for configuration, diagnostics, or

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.19. Functional Requirements

a) Each indication shall be clearly distinguishable (through color coding, blinking

patterns, or display messages)

b) The system shall support easy fault identification without requiring external

c) Indicators/display shall function reliably under field environmental

6.1.20. Integration of status/ events with Centralise portal :

 Door opening alerts

 Communication failures

 Power status changes

 Data transmission issues

shall be logged at the gateway level and transmitted to the GEDA

central portal, enabling centralized monitoring and proactive

maintenance/action.

6.1.21. The SIG agencies shall be provided with site/installation details along with

appropriately rated energy meters based on SPV system capacity, IoT-based

DCU, Surge Protection Device (SPD), power and communication wiring, and all

necessary auxiliary components required for complete deployment.

6.1.22. The Contractor shall ensure that the selection and configuration of the Solar

IoT Gateway (SIG) is aligned with the contract load and SPV system capacity of

each respective consumer.

6.1.23. The SIG shall be designed as a plug-and-play system, facilitating quick, simple,

and seamless installation. The integration shall comprehensively cover:

 Proper termination of incoming cable from Inverter/ACDB and outgoing cable

towards the DISCOM energy meter

 Proper termination with Energy meters and Inverter communication cable

from DISCOM energy meter

 Communication cable Interface with the Solar PV system or inverter

 All required internal and external power and communication wiring

6.1.24. During field deployment, it shall be ensured that the SIG is installed as close

as practically feasible to the Solar PV system, preferably on or near the SPV

structure, to enable optimal system performance, ease of connectivity, and

minimal wiring complexity.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.25. The energy meter shall communicate with the IoT DCU using standard DLMS

protocol over an RS-232 interface.

6.1.26. The inverter(s) and other sensors shall communicate with the IoT DCU using

MODBUS protocol, and shall be connected either in serial or multi-drop

configuration through RS-485 ports and/or AI/AO and/or DI/DO interfaces, as

6.1.27. The MODBUS register map for the inverter(s) shall be obtained by the SIG

agency from the respective OEMs and configured in accordance with the data

requirements of the GEDA portal to ensure accurate data acquisition and

6.1.28. The instantaneous parameters, load survey data, and tamper events shall be

acquired from energy meters strictly in accordance with the standard DLMS

protocol. All such data shall be processed and transmitted to the central portal

in a standardized JSON format, ensuring proper data structuring, validation, and

6.1.29. The data transfer mechanism shall include:

 Secure data transmission with defined communication protocols

 Acknowledgement (ACK/NACK) mechanism to confirm successful data

 Retry and backfill provisions for failed or missing data blocks

 Compliance with the data format, APIs, and integration guidelines

provided by the designated software vendor

6.1.30. Standardization of Data Parameters

The bidder shall ensure that all required parameters—including but not limited

to electrical measurements, event logs, and historical data—are captured and

transmitted in a uniform and standard format, irrespective of the make or

model of the energy meter or inverter.

6.1.31. Interoperability Requirements

The system shall be designed to ensure complete interoperability, meaning:

 Energy meters and inverters of different manufacturers shall

seamlessly communicate with IoT-based DCUs/RMS of any empanelled

vendors of this project

 The system shall support a plug-and-play mechanism, avoiding vendor

 Data exchange shall remain consistent and compatible across multiple

devices and platforms without requiring major reconfiguration

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.1.32. Compliance with Standards and Guidelines

The bidder shall mandatorily refer to and comply with:

 Relevant MNRE guidelines/documents

 Defined parameter lists, data mapping structures, and criticality

classifications, etc.

6.1.33. Onsite Data Retrieval and History Backfill Mechanism

The scope of work shall include a firm commitment from the bidder to ensure

onsite data acquisition and restoration of missing data in the event of

communication failure or non-availability of data on the central server, so as

to avoid any adverse impact on SLA compliance.

6.1.34. Onsite Data Access Provision

In case of communication failure, the bidder shall ensure that data can be

retrieved locally through the following means:

 Direct access from the IoT-based DCU via Ethernet port and Wi-Fi/BLE

 Retrieval from the energy meter using MRI (Meter Reading Instrument)

through optical port

6.1.35. Data Upload Mechanism

All data retrieved through onsite mechanisms shall be:

 Uploaded to the central server only through the designated “SINK”

mechanism once connectivity is restored

 The IoT DCU shall ensure secure, validated, and acknowledged data

 No alternative or manual data upload mechanisms shall be permitted,

ensuring data integrity and system standardization.

6.1.36. History Backfill Functionality

In cases where communication failure persists for a considerable duration and

results in data gaps:

 The IoT DCU shall support automated history backfill functionality

 The system shall process acknowledgements received from the GEDA

 Based on such acknowledgements, the DCU shall identify missing data

blocks, prepare a missing data index, and initiate retrieval from local

storage (meter/DCU memory)

6.1.37. Priority-Based Data Synchronization

The backfilled data transmission shall be executed as per priority defined by

GEDA, ensuring:

 Critical and recent data is transmitted first

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

 Gradual synchronization of historical data without overloading the

 Avoidance of network congestion and data loss

6.1.38. Compliance Responsibility

The bidder shall ensure that:

 No data loss occurs due to communication failure

 All missing data is recovered and uploaded within stipulated timelines

 The entire process is fully automated, traceable, and compliant with

portal integration requirements

6.1.39. Real-time Monitoring of important parameters as per the requirements of

GEDA Portal of Solar Inverter by RS-485 communication through Modbus

protocol to the IoT DCU and from DCU to the server via GPRS/3G/LTE

communication with GEDA Portal.

6.1.40. The IoT DCU shall require to communicate with all different makes of

inverters to be used in the scheme for Solar PV installation and having different

Modbus IDs and send the same data to the GEDA Portal with the defined JSON.

The requirement of the parameters from the inverters shall be as mentioned in

MNRE guidelines.

6.1.41. The bidder shall be responsible for the supply, installation, testing, and

commissioning of armoured communication cables required for connectivity

between the inverters/energy meters and the Solar IoT Gateway (SIG).

6.1.42. The scope shall include:

a) Proper laying, routing, fastening, and dressing of communication cables

b) Trenching/digging and restoration work, wherever required, for underground

c) Ensuring adequate mechanical protection and environmental safety of cables

6.1.43. All communication cables shall be terminated with proper connectors at both

ends, ensuring:

a) Secure and reliable connectivity

b) Proper crimping and adherence to standard wiring practices

c) Compatibility with the communication interfaces of connected devices

6.1.44. The bidder shall ensure that the complete installation is carried out in a neat,

safe, and durable manner, complying with applicable standards and site

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.2. Solar IoT Gateway (SIG) Rating and its key components:

6.2.1. Energy Meters:

I. The energy meter specified under this Technical Specification shall be uni-

directional, compliant with standard DLMS protocol, and equipped with both

RS-232 serial communication port and optical port for data access.

II. The static energy meters to be deployed as part of the SIG shall be procured

only from vendors registered with DISCOMs under GUVNL, and shall conform

to the latest applicable specifications issued by the DISCOMs of GUVNL.

III. The energy meters shall be interfaced with the IoT DCU through the RS-232

serial port using standard RJ-11 pin configuration, ensuring reliable and

standardized communication.

IV. The meter manufacturer shall provide the necessary software/tools for

downloading data through the optical port, ensuring compatibility and

interoperability with meters of different makes adhering to DLMS protocol.

The manufacturer shall also provide lifetime support for software updates,

upgrades, and bug fixes without any additional cost.

V. The bidder/meter manufacturer shall ensure that all relevant data, APIs,

communication protocols, software utilities, and source code (wherever

applicable) related to the supplied model are made available to GEDA as and

when required, without delay and without any additional financial

implications, throughout the lifecycle of the project.

6.2.2. Ring type CTs:

Plastic Encapsulated ring type CT of 100/5 A and 200/5 A rating for CT operated

Energy meters are essential. The bidder shall consider a set of three nos. of

current transformers for each Solar IoT Gateway (SIG). The Technical

specifications & GTP for the CTs shall be procured only from vendors registered

with DISCOMs under GUVNL, and shall conform to the latest applicable

specifications issued by the DISCOMs of GUVNL.

6.2.3. Aluminium Bus Bar: EC Grade aluminium Bus Bar shall be used in the Solar IoT

Gateway (SIG) wherever applicable. The Bus Bar shall be in one piece only.

Aluminium bus bars and links should be properly drilled, debarred, and bolted to

minimize the heating of joints.

I. Bus bars shall be covered with color coated heat-shrinkable Insulating sleeves

for the Phase identification R, Y and B

II. The current density of Al. Bus bar size shall not be more than 1 A/sq. mm. The

bidder will have to specify a suitable size supporting with calculations.

6.2.4. Clearances and Creepage distance: The clearance and Creepage Distance

inside the Solar IoT Gateway (SIG) shall be as per relevant IS/IEC standard. The

minimum clearance between the two phases and Phase to neutral shall be

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

mm in the main bus bars. There shall be the provision of insulating phase

separator between the terminals for its safe working.

6.2.5. Wiring : The power cable used for internal wiring (i.e Bus bar to Energy

Meter) of the Solar IoT Gateway (SIG) shall be flexible flame retardant (FR) PVC

Insulated single core unsheathed industrial multi-strand plain annealed

electrolytic grade bare Aluminium conductors having 99.97% purity for voltage

grade up to 1100 V confirming to IS 694:2010. Wherever there is a bi-metallic

connection (Aluminium-Copper), the connection should be done through

Bimetallic Compression Cable Lugs.

a) Cable construction: Conductor: Plain annealed electrolytic grade Aluminium

conductor as per IS:

I. Insulation: Primary – PVC (Type C) with FR property as per IS

II. Colour- R Phase-Red, Y Phase-Yellow, B Phase- Blue, Neutral –Grey

b) All the cables quoted/supplied shall bear ISI mark and of reputed make. The

PVC Cable shall conform in all respects to high System standards of

engineering, design, workmanship, this specification, and the latest revisions

of relevant standards at the time of offer.

6.2.6. Solar IoT Gateway (SIG) (SMC Type):

a) The energy meter along with all associated components shall be housed

within a single, robust SMC (Sheet Moulded Compound) enclosure, forming

an integrated Solar IoT Gateway (SIG) unit. The enclosure shall accommodate

the following components:

 Energy meter (as per specified rating)

 IoT-based DCU device

 Plastic encapsulated ring-type CTs (wherever applicable)

 Bus bars of adequate current carrying capacity

 Power and control wiring

 Surge Protection Device (SPD)

 All necessary auxiliaries and accessories

b) Integrated Design and Arrangement

The bidder shall be responsible for the detailed design and internal

arrangement of all components within the SIG enclosure, ensuring:

 Proper segregation of power and control circuits

 Adequate spacing for heat dissipation and ventilation

 Ease of access for operation, maintenance, and replacement

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

 Safe routing and termination of all cables

 The SIG shall be delivered as a factory-integrated, ready-to-use unit with a

plug-and-play configuration, minimizing on-site assembly and installation

c) Mounting Provisions

The SIG SMC enclosure shall be designed for flexible mounting options, including:

 Wall-mounted installation

 Pole-mounted installation

 Mounting on angle/channel structures of the SPV system

The bidder shall consider all such mounting requirements while preparing and

submitting the detailed design drawings, ensuring structural stability and ease of

installation under field conditions.

d) Installation Location

The complete SIG unit shall be installed at or near the existing ACDB/Inverter,

 Minimal cable routing

 Ease of integration with existing electrical infrastructure

 Accessibility for monitoring and maintenance

e) Electrical Safety and Isolation

The design shall ensure proper electrical isolation and segregation between:

 Terminal blocks for service cable (incoming supply)

 Power cable from solar inverter

 Load (e.g., connected load)

and other internal components of the SIG.

f) Adequate precautions shall be taken to:

 Prevent heat transfer and localized heating due to loose or faulty connections

 Avoid risk of short circuit, sparking, or fire hazards

 Ensure secure and properly crimped terminations with appropriate

g) Compliance and Reliability

The overall design and assembly of the SIG shall comply with applicable safety

standards and best engineering practices, ensuring durability, operational safety,

and long-term reliability in field conditions.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

6.2.7. Surge Protection Device (SPD):

6.2.7.1. The bidder shall ensure provision of Type 2 Surge Protection Devices

(SPD). The SPD shall be designed to effectively protect the Solar IoT

Gateway (SIG) and associated equipment against transient over-voltages

arising from lightning and switching surges.

6.2.7.2. Construction and Configuration

 Be of combination type, capable of handling multiple surge paths

 Be DIN rail mounted, suitable for installation inside the SIG SMC enclosure

 Be designed for continuous and reliable operation under specified electrical

and environmental conditions

6.2.7.3. Protection Modes

The SPD shall provide comprehensive protection in all three modes:

 Phase to Neutral (P–N)

 Phase to Earth (P–E)

 Neutral to Earth (N–E)

This shall ensure full protection of the system against differential as well as

common mode surges.

6.2.7.4. Electrical Ratings

 The SPD shall have a nominal discharge current (In) of not less than 20 kA

 The SPD shall have a maximum discharge current (Imax) of not less than

 The SPD shall be compatible with the system voltage and frequency as

specified in this technical specification

6.2.7.5. Environmental and System Compatibility

The SPD shall be suitable for operation under the atmospheric and electrical

conditions specified in this document, including temperature, humidity, and site

conditions prevalent in the project area.

6.2.7.6. Compliance and Documentation

The SPD shall comply with relevant applicable standards (such as IEC/IS standards

for surge protection devices). The bidder shall submit detailed Guaranteed

Technical Particulars (GTP) of the SPD in accordance with Annexure–E for approval

6.3. Remote Monitoring System/Communication System Requirement:-

6.3.1. Near real-time communication within the Solar IoT Gateway (SIG) ecosystem—

comprising communication between energy meters and IoT-based DCU, and

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

further transmission from the IoT DCU to the GEDA Portal through the Head-End

System (HES)—is critical for ensuring effective data acquisition, monitoring,

control, and overall system management. The reliability and robustness of this

communication framework shall be a key requirement for successful operation

of all installations.

6.3.2. Data Acquisition and Communication Frequency

The SIG shall be capable of transmitting data at a default interval of 15 minutes.

However, the system architecture shall be designed with flexibility to support

configurable data intervals ranging from 5 minutes (minimum) to 1 day

(maximum) as may be required in future without any major hardware

6.3.3. Internal Data Storage Requirements

a) To ensure data integrity and availability, the energy meter shall have sufficient

internal memory to store load survey data at 15-minute intervals for a

minimum period of 180 days.

b) The IoT-based DCU shall also be equipped with adequate on-board memory to

store all relevant data during periods of communication failure or network

unavailability.This shall ensure no loss of critical operational data and support

subsequent data retrieval and synchronization.

6.3.4. Communication Protocols

a) The IoT-based DCU shall acquire electrical parameters from energy meter

using the standard DLMS protocol, ensuring interoperability across different

b) The communication between IoT DCU and GEDA Portal (via HES) shall follow

secure, standardized data exchange mechanisms, as per system requirements.

6.3.5. Data Reliability and Continuity

a) Reliable and continuous data flow under normal operating conditions

Automatic data buffering and backfilling in case of communication

b) Seamless synchronization of stored data with the central server once

connectivity is restored

6.3.6. System Architecture Requirement

The bidder shall design and implement a robust Remote Monitoring System (RMS)

architecture, covering:

 Field-level communication (meter to IoT DCU)

 Data aggregation and processing at IoT DCU level

 Secure transmission to HES and GEDA Portal

 End-to-end monitoring, control, and analytics capability

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

Detailed architecture, communication flow, and component specifications shall be

provided by the bidder as part of the technical submission.

6.3.7. IoT-based DCU/RMS:

6.3.7.1. Galvanic Isolation

The bidder shall ensure adequate galvanic isolation between the inverter(s)

and the Solar IoT Gateway (SIG) to prevent electrical interference, ground

loops, and potential damage due to voltage differences. The isolation design

shall ensure safe and reliable data communication without impacting the

performance of connected equipment.

6.3.7.2. MODBUS Communication over RS-485

I. Communication between inverter(s) and IoT DCU shall be based on MODBUS

protocol over 2-wire RS-485 interface, compliant with TIA/EIA-485-A

II. The IoT DCU shall support communication at a baud rate of 9600 bps or

higher, configurable as per the requirements of the connected devices.

III. RS-485 communication interfaces shall be provided through RJ45 connectors

or equivalent industrial-grade connectors.

6.3.7.3. Connections to inverter(s) shall be established through dedicated

communication ports, ensuring stable and interference-free data

6.3.7.4. All communication ports shall have a minimum isolation of 2000 Vrms

 Input power supply

 Field I/O interfaces

 Internal controller circuitry

 Surge Protection for Communication Ports

6.3.7.5. In addition to electrical isolation, all communication ports shall be

equipped with surge protection of ±4 kV or higher, either through internal

circuitry or external protective components.

6.3.7.6. The surge protection shall safeguard the system against transient

over-voltages caused by lightning, switching operations, or grid

6.3.7.7. The bidder shall mandatorily submit type test certificates/reports

demonstrating compliance with IEC 61000-4-5 (Surge Immunity Test).

6.3.7.8. EMI/EMC Compliance

 The IoT DCU and associated communication interfaces shall comply

with all relevant EMI (Electromagnetic Interference) and EMC

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

(Electromagnetic Compatibility) requirements as per applicable IS/IEC

 The design shall ensure that the SIG system neither generates

excessive electromagnetic disturbances nor is adversely affected by

external electromagnetic noise, thereby ensuring stable and reliable

operation in field conditions.

6.3.8. Communication with other field Interfaces:

I. In case of other peripheral devices (e.g. SMC box door open/ close indicator),

the DCU may communicate based on appropriate digital or Analogue signals.

II. The DCU shall provide for additional field interfaces through at least 3 Digital

input with Dry/Potential Free Contacts and with isolation up to 2000 Vrms

III. DCU shall be Provided at least 03 Digital outputs capable of handling DC/AC

switching Device/Contactors, which shall have an isolation capability of up to

4000 VAC, electrical endurance of at least 100,000 cycles and mechanical

endurance of at least 10,000,000 cycles.

IV. The DCU shall be supplied with 2 analog Inputs with 0.1% FSR accuracy for

sensor integration (e.g. Irradiation, Moisture, Level Transmitter, Flow

6.3.9. Remote connectivity and communication with GEDA portal for device

integration. GEDA/GEDA/cloud/Central NiC server:

I. Connectivity: The DCU shall communicate with the server through 2G/3G/

GPRS/ LTE/NB IoT (SIM Card compatible with fall back to 2G and 3G), etc

connectivity using a secure communication protocol.

a. Communication data format: The DCU shall provide data to the server in

JSON format as defined in MNRE guidelines/GEDA Portal requirement and

as per the model guideline of MNRE for GEDA portal and communication

b. The DCU to server communication interval should be configurable in

multiple of 1 minute for different group of data. DCU should have

provision for on demand communication for data and configuration read

as well as write. The bidder is required to refer the MNRE guideline for the

requirement of communication architecture, various communication

modes, device integration etc.

II. Communication Security: Multilayer security shall be implemented for the

communication between DCU and Central/Cloud Server.

a. Communication between DCU and Server should be secured and

encrypted using TLS/SSL/X.509 certificate etc.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

b. As a part of IoT protocol, Authentication and Authorization should be

implemented using token/password mechanism

c. OTP based token and key exchange mechanism should be established

between DCU and Central / Cloud Server where every 15/30 minutes new

token and key shall be generated against a specific device ID which is

required as a part of JSON message.

III. SIM capability: The DCU shall have dual SIM capability and quad band GSM/

GPRS connectivity, GPRS shall be multi slot Class 12, with low power

consumption and operation temperature range of 0 to 85°C. it shall support

SIM card from any service provider.

IV. Communication Modes:

a. Push Data on Event/Notification: such as SPV generation OFF, Low or No

generation alert, Various alerts of Inverters.

b. Push Data Periodically: Instantaneous parameters of Energy meters and

inverter (as mentioned in tender) should be pushed to central server on

configurable interval

c. Pull On demand: If required, central server can fetch data from device on

user demand or request like load survey, billing data or other non-critical

d. Command on Demand: It should be possible to send commands to

Remote monitoring system either for DI/DO operations or AI/AO

operations or to update configuration.

V. Over the air (OTA) capability: The DCU shall be equipped with robust and

secure Over-The-Air (OTA) capabilities, enabling remote configuration

updates subject to prior approval from GEDA or the designated authority.

Through this OTA functionality, the DCU shall allow authorized personnel to

add, modify, or rectify configuration files related to connected meters and

inverters without requiring physical access to the device. It shall also support

dynamic modification of data formats and communication parameters,

including the ability to change data transmission endpoints or destination

locations as per system requirements.

In addition, the OTA mechanism shall facilitate efficient troubleshooting and

resolution of software-related issues, ensuring minimal system downtime

while maintaining a high level of cybersecurity and access control. All such

updates must be carried out in a secure and authenticated manner, with

appropriate safeguards to prevent unauthorized access or tampering.

Furthermore, the DCU firmware shall be designed to support updates

through multiple channels. These shall include a wired serial connection as

well as wireless methods such as Wi-Fi or other suitable communication

interfaces, ensuring flexibility in deployment and maintenance scenarios.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

The DCU shall also support remote configuration updates for critical

operational parameters. These shall include, but not be limited to, IP address

settings, APN configurations, data logging frequency, and predefined set

points for events and protection mechanisms. This capability will ensure that

system performance can be optimized and adapted in real time to meet

evolving operational and regulatory requirements without necessitating on-

site intervention.

VI. Data Storage and retrieval In the event of temporary or prolonged failure of

GPRS/communication connectivity, the DCU shall automatically operate in

offline data retention mode and securely store all operational, metering, load

survey, and event data in its internal memory without any loss of information.

The DCU shall be provided with a minimum 4 GB industrial-grade SD

card/internal storage, or higher capacity as required, sufficient to store 15-

minute interval data of all connected energy meters and inverters, along with

event logs and load survey data, for a minimum period of six (6) months. The

system shall also support storage of at least 1,000 timestamped events.

The storage system shall ensure data integrity, cybersecurity, and protection

against unauthorized access, removal, tampering, or replacement through

suitable tamper-proof and anti-theft mechanisms.

Upon restoration of communication connectivity, the DCU shall automatically

synchronize and transmit all buffered/missing data to the designated

cloud/server platform in proper chronological sequence without duplication

or data loss. The system shall support acknowledgment-based data transfer,

missing data identification, historical backfilling, and automatic data recovery

in accordance with the protocols defined by Gujarat Energy Development

Further, during extended communication outages, the DCU shall be capable

of transmitting critical billing, energy, alarm, and operational parameters

through alternative communication mechanisms such as SMS or equivalent

technologies to predefined recipients/systems to ensure continuity of

monitoring and energy accounting functions.

VII. Remote Diagnostics: The DCU shall be equipped with comprehensive remote

diagnostics capabilities to enable effective monitoring, maintenance, and

fault resolution without the need for physical intervention. It shall

continuously monitor and report key communication health parameters such

as RSSI (Received Signal Strength Indicator), network registration status,

GPRS session status, and overall connectivity condition. The system shall

provide real-time visibility into these parameters through the central

monitoring platform, allowing operators to proactively identify and address

communication issues.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

In addition, the DCU shall support remote control functionalities, including

the ability to restart or reset the GPRS communication module from the

central system. This feature shall help in restoring connectivity in case of

transient network or module-related issues, thereby minimizing downtime

and reducing the need for on-site maintenance visits.

For local communication interfaces, the DCU shall provide detailed

diagnostics for RS485 and RS232 ports. This shall include, but not be limited

to, tracking the number of communication attempts, failures, and retries per

port, as well as maintaining logs of data transmission errors and timeouts.

The system shall also capture and report device-level diagnostics, including

meter-level and inverter-level communication status, error counts, and fault

Furthermore, the DCU shall be capable of generating structured diagnostic

logs and alerts, enabling trend analysis and root cause identification. These

diagnostics shall support both real-time monitoring and historical analysis,

ensuring improved reliability, faster troubleshooting, and enhanced

operational efficiency of the overall RMS infrastructure.

6.3.10. Local connectivity with the DCU: The DCU shall be designed to support secure

and reliable local connectivity for configuration, diagnostics, data access, and

maintenance activities through multiple interfaces. These local access provisions

shall ensure flexibility for field operations while maintaining stringent security

I. Ethernet Port Connectivity:

The DCU shall be equipped with a dedicated Ethernet port to facilitate wired

local communication. The Ethernet interface shall support local connectivity

through a built-in web server, enabling authorized users to perform

configuration, monitoring, and data retrieval functions via a standard web

The embedded web interface shall be secured through robust authentication

mechanisms, including password protection and, where applicable, role-based

access control to restrict user privileges. The DCU shall also support firmware

upgrades and device programming through the Ethernet interface, ensuring

efficient maintenance and updates during field visits.

From a technical compliance standpoint, the Ethernet interface shall conform

to IEEE 802.3 standards and shall incorporate a minimum of 1500 Vrms

magnetic isolation to ensure electrical safety, signal integrity, and protection

against surges or ground potential differences.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

II. Secure Wi-Fi / BLE Connectivity:

In addition to wired access, the DCU shall support wireless local connectivity

through an inbuilt secure Wi-Fi or Bluetooth Low Energy (BLE) interface. This

capability shall enable field personnel to connect to the DCU using handheld

devices such as smartphones or tablets without requiring physical cabling.

Access to the DCU via Wi-Fi or BLE shall be strictly controlled through secure

authentication protocols, including password protection and encryption, to

prevent unauthorized access. The Contractor shall provide a dedicated mobile

application (“Mobile App”) compatible with standard operating systems, which

shall serve as the interface for connecting to the DCU.

Through this Mobile App, authorized users shall be able to perform key

functions such as meter data reading, system configuration, diagnostics, and

firmware updates. The application shall be designed with user-friendly

navigation while adhering to cybersecurity best practices, ensuring secure

communication between the handheld device and the DCU.

Together, these local connectivity options shall provide a comprehensive,

secure, and flexible framework for on-site interaction with the DCU, supporting

efficient commissioning, maintenance, and troubleshooting operations.

6.3.11. GPS sensor and Clock of the DCU/IoT:

The DCU/IoT hardware shall be equipped with an integrated GPS module capable of

supporting multi-constellation operation, like GPS, GLONASS, Galileo, and NavIC, to

ensure improved accuracy and reliability of positioning and timing data. The GPS

module shall communicate with the system controller through a standard UART

interface, configurable within a baud rate range of 9600 to 115200 bps. The system

shall incorporate either an on-chip antenna or an external active antenna, suitably

designed and positioned to ensure reliable signal reception under field conditions.

In addition, the hardware shall include a low-power Real-Time Clock (RTC) integrated

circuit with a minimum battery backup of 10 years to ensure continuous timekeeping

during power interruptions. The RTC shall interface with the main controller via any

standard communication protocols such as I2C or SPI etc.

The firmware shall be designed to efficiently process GPS data by parsing standard

NMEA sentences, validating the integrity of the GPS fix (and rejecting invalid or

incomplete data), and accurately extracting time and coordinate information. A robust

time synchronization mechanism shall be implemented with a defined priority

hierarchy, wherein GPS-derived time shall be treated as the primary and most

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

accurate source, followed by the RTC as a fallback mechanism, and optionally network

time as an additional backup. Since GPS provides time in UTC, the firmware shall also

include provisions for appropriate time zone conversion.

For data management, the system shall ensure that all events and measurements are

timestamped using the synchronized RTC, thereby maintaining consistency and

traceability. Additionally, location coordinates shall be recorded and stored along with

critical events for geo-referencing and audit purposes.

The system shall incorporate comprehensive error handling mechanisms, including

the ability to detect loss of GPS signal, maintain and utilize the last known valid

location during signal unavailability, and flag any stale, invalid, or unreliable data to

prevent incorrect processing or reporting.

6.3.12. Power supply to the DCU:

The DCU shall be designed with a robust and reliable power architecture to ensure

uninterrupted operation under varying field conditions. It shall be powered through

a three-phase, four-wire AC supply system via an internal or external Switched

Mode Power Supply (SMPS), capable of delivering a regulated 12V or 24V DC

output. The SMPS shall be designed to operate over a wide input voltage range of

85V to 520V AC, ensuring compatibility with fluctuating grid conditions. The DCU

shall support operation using any two phases of the available three-phase supply,

thereby enhancing availability and operational resilience in case of partial phase

To ensure continuity of operation during power interruptions, the DCU shall be

equipped with an internal battery backup system. The battery shall be capable of

supporting DCU operation for a minimum duration of 10 hours, assuming periodic

communication intervals of once every hour, along with continuous monitoring of

network health and connectivity status. The DCU shall incorporate intelligent

power management features to optimize battery usage during outages.

Additionally, the system shall be capable of automatically detecting power failure

and restoration events and promptly transmitting corresponding alerts to the Head

End System (HES). The battery provided shall be of high reliability with a guaranteed

operational life of at least 10 years under standard operating conditions.

The DCU shall include comprehensive electrical protection and isolation

mechanisms to safeguard sensitive electronics from grid disturbances and faults.

Adequate isolation shall be maintained between different sections of the system,

with AC-DC isolation rated up to 2500 VAC and DC-DC isolation up to 1500 Vrms.

The design shall specifically ensure three levels of isolation: between the input

power supply and the microcontroller circuitry, between the input power supply

and communication interfaces, and between the microcontroller and

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

communication modules. These isolation measures shall protect against voltage

surges, transients, and ground potential differences.

Furthermore, a dedicated Surge Protection Device (SPD) shall be provided for the

three-phase input power supply to protect the DCU against lightning strikes,

switching surges, and other transient overvoltages. The SPD shall be appropriately

rated for the application and installed in accordance with relevant standards.

For effective operation of the surge protection system, a proper earthing

arrangement shall be ensured. If a separate or dedicated earthing system is

required for the SPD, it shall be provided as part of the overall scope, ensuring

compliance with safety standards and optimal performance of the protection

6.3.13. Embedded Features:

a. The DCU shall support remote configuration and data exchange using MODBUS data

mapped over MQTT protocol. The device shall communicate with a central MQTT

broker using a publish/subscribe architecture, enabling secure and efficient

transmission of configuration parameters, telemetry data, and control commands.

Configuration updates shall be carried out through predefined MQTT topics, wherein

the DCU shall subscribe to configuration topics and publish acknowledgements/status

on designated response topics. The communication shall be secured using TLS

encryption and authenticated access mechanisms.

b. Event/Alarm Processing:

The DCU shall be equipped with an advanced event and alarm processing engine

capable of real-time monitoring, configuration, and evaluation of defined threshold

conditions against any measured electrical parameter, including but not limited to

Load, Power Factor, kVAR, kW, kVA, voltage, and current. The system shall allow

flexible configuration of event rules, enabling users to define custom thresholds, dead

bands, time delays, and severity levels for different operational scenarios.

Upon detection of any configured event or alarm condition, the DCU shall immediately

generate an event packet and transmit it to the remote server or Head End System

(HES). Each event notification shall include a real-time snapshot of all relevant meter

or inverter parameters within the associated data group, ensuring complete

contextual visibility at the time of occurrence. This shall support accurate diagnostics,

auditability, and post-event analysis.

Additionally, the DCU shall incorporate an inbuilt temperature sensor for continuous

monitoring of internal device temperature and/or ambient conditions. The system

shall generate alarms and notifications in case of abnormal temperature rise beyond

configured thresholds, enabling preventive action to avoid equipment stress,

malfunction, or failure.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

c. Electrical System Diagnosis, Status Updates and Notifications:

The DCU shall continuously perform electrical system health diagnostics and provide

real-time status updates pertaining to grid supply conditions and phase availability.

This shall include detection and reporting of grid supply presence or absence,

identification of three-phase or single-phase supply conditions, and monitoring of

electrical anomalies such as overload, over-voltage, under-voltage, and voltage

imbalance across phases.

The system shall be capable of generating immediate notifications for any deviation

from predefined operating limits, thereby enabling rapid response to potential faults

or abnormal operating conditions. These diagnostics shall be timestamped and

communicated to the central monitoring platform for further analysis and action.

d. Performance Calculations:

The DCU shall support advanced performance analytics and energy evaluation

functions, including calculation of Capacity Utilization Factor (CUF) expressed in

percentage terms for connected generation assets. The system shall also generate

intelligent alerts for low generation or no-generation conditions based on

configurable thresholds, time windows, and expected performance benchmarks.

These evaluations shall be customizable to accommodate site-specific conditions,

seasonal variations, and operational profiles, ensuring accurate performance

assessment and anomaly detection for energy generation systems.

e. Remote Inverter Configuration:

The DCU shall support secure remote configuration of connected inverters through

the central server or Head End System. This shall include the ability to modify critical

operational set points such as output voltage, active power, reactive power, frequency

limits, ramp rates, and other grid-support parameters as applicable.

All configuration commands shall be executed through authenticated and encrypted

communication channels, ensuring protection against unauthorized access or

tampering. The DCU shall acknowledge each configuration update with confirmation

status and shall log all parameter changes for audit and traceability purposes. This

capability shall enable dynamic grid support, remote optimization, and efficient

management of distributed energy resources.

6.4. Data Redundancy and Manual Data Retrieval Mechanism:

In the event of non-functioning of any subsystem, communication failure, or inability

of the DCU to collect or transmit data from energy meters due to any reason such as

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

network outage, device malfunction, configuration error, or field-level

communication breakdown, the system shall provide a reliable fallback mechanism

for manual or alternative data acquisition.

For this purpose, the energy meters shall support direct data retrieval through

standard communication interfaces such as optical port and/or Ethernet port. This

shall ensure uninterrupted access to metering data even in the absence of DCU-based

communication. The optical port-based access shall conform to relevant metering

communication standards and shall support secure, authenticated data extraction.

The Contractor shall provide a centralized Base Computer Software (BCS) to GEDA,

which shall act as a unified platform for meter data acquisition, management,

validation, and reconciliation. The BCS shall be capable of interfacing with multiple

meters directly through optical or Ethernet connections, enabling manual or field-

based data collection when automated systems are unavailable.

Furthermore, the software solution shall include a robust data synchronization and

database update mechanism. This shall allow seamless integration of manually

collected or fallback data into the central server database. The system shall ensure

proper validation, timestamping, and source tagging of such data to distinguish it from

automatically acquired DCU data.

The BCS shall also support audit trails, data integrity checks, and reconciliation

features to identify missing data intervals and facilitate backfilling into the central

repository. This ensures continuity of records, data completeness, and reliability of

billing, monitoring, and energy accounting processes even under system failure

All the type tests as under shall be carried out at the laboratories accredited by the

National Accreditation Board of Testing and Calibration Laboratories (NABL) or any

International Lab. Accredited Cooperation (ILAC) or any govt. lab in accordance with

relevant IS/IEC latest amendments. Type tests shall not be more than 7 years old on the

date of the Tender opening. All the type test reports shall be submitted by the successful

bidder within the commencement period. The offers received without type tests shall be

tested as non-responsive rejected.

7.1. DCU: The DCU shall be Type tested for compliance to following EMI/EMC standards

in any International Lab, Accredited Cooperation (ILAC) or an external NABL

accredited laboratory or any govt. lab.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

EMI/EMC Testing

Sr No Particulars

1 Surge Immunity Test (IEC 61000-4-5), 2 kV, Level-3 A

2 Electrical Fast Transient (IEC 61000-4-4), 2 kV, Level-3 A

3 Electrostatic Discharge (IEC 61000-4-2), 4 kV, Level-2 A

4 Radiated Electromagnetic Field Test (IEC 61000-4-3), 3 V/m, Level-2 A

5 Power Frequency Magnetic Field (IEC 61000-4-8) ,10 A/m, Level-3 A

Conducted Disturbances induced by radio frequency (IEC 61000-4-

6), 10 Vrms, Level-3

7 Voltage Dips, short interruptions (IEC 61000-4-11) A

8 Dry Heat test (IEC 60068-2-2), continuous operations @ 55 deg. C O

9 Damped Heat Test (IEC 60068-2-78), @ 95% RH and 40 deg. C O

Note: Passing Criteria

A: Temporary degradation or loss of function or performance which is self-recoverable

O: Normal performance within the specified limits

1 Radio Interference measurement as per CISPR22 As per Std.

8. Acceptance/Routine Test:

The Contractor shall develop and document proposed Test Procedures and Test Plans for

Acceptance Testing (FAT). The supplier shall finalize the proposed Acceptance Testing and

commissioning Testing plans and procedures. The final Test Procedures and Test Plans

shall be subject to review and approval prior to testing. All system documentation shall

be completed, reviewed, and approved by the GEDA.

8.1. Acceptance Tests: -

The database structures, user interface displays, dashboards, and all report formats

developed and configured by the Contractor shall be comprehensively demonstrated to,

and verified by, authorized officials of GEDA prior to final acceptance testing. This

demonstration shall ensure that all data models, analytics outputs, visualization formats,

and reporting templates conform fully to the functional and technical requirements

specified in the contract. Any discrepancies observed during this stage shall be rectified

by the Contractor prior to proceeding further.

The entire Solar IoT Gateway (SIG) system, including all AMI functionalities,

communication pathways from energy meters and inverters to the DCU, and end-to-end

system performance, shall be subjected to detailed testing and live demonstration. This

shall include validation of real-time data acquisition, transmission integrity, control

command execution, and performance analytics under operational conditions. Each

category of factory and system-level testing outlined below—comprising hardware

integration testing, functional performance testing, and integrated system testing—shall

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

be conducted as part of the acceptance testing process, either at site or at a mutually

agreed test facility.

8.1.1. Visual Inspection

A detailed visual inspection shall be carried out to verify that the system delivered is

complete, properly assembled, and configured in accordance with approved design

documentation and specifications. This inspection shall include confirmation of all

hardware components forming part of the SIG system, ensuring that no element is missing

or incorrectly installed.

Workmanship shall be assessed to ensure industrial-grade quality standards, including

proper mounting, enclosure sealing, and cable management practices. All equipment,

cables, and connectors shall be properly labelled, ferruled, and/or cable-tagged in a clear

and durable manner to ensure traceability and ease of maintenance. All wiring shall be

securely fastened using appropriate cable ties or equivalent fixtures, ensuring mechanical

stability and compliance with safety standards.

Field interface provisions of the DCU, including digital inputs (DI), digital outputs (DO),

analog inputs (AI), and analog outputs (AO), shall be verified against the approved

specifications. The complete Single Line Diagram (SLD) shall be displayed at appropriate

locations, clearly indicating all system components, along with full forms and definitions

of all tags used. Necessary warning boards, safety signage, and operational notices shall

be installed wherever applicable to ensure safe operation and maintenance.

8.1.2. Communications and Interfacing Test

This test shall validate the correct operation of all communication links and interfacing

mechanisms across the system. It shall ensure that all interconnected components of the

SIG, including data acquisition modules, control elements, monitoring systems, and data

management platforms, are functioning correctly when integrated.

The test shall specifically verify end-to-end communication flow from energy meters and

inverters to the DCU, and further to the central server or HES. Data integrity, packet

delivery, protocol compliance, and response consistency shall be evaluated under normal

and stressed operating conditions. Any communication failure, delay, or data mismatch

shall be recorded and rectified.

8.1.3. DCU Functional Verification

The DCU shall undergo detailed functional verification to ensure that all system features

and operational requirements defined in the contract are fully implemented and

performing as intended. This shall include, but not be limited to, verification of data

acquisition from energy meters and inverters through all supported communication

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

The test shall also validate alternative data acquisition methods such as Wi-Fi or other

configured wireless modules, ensuring redundancy and continuity of operation. All

additional functionalities, including event processing, alarm generation, data buffering,

local configuration access, and remote communication capabilities, shall be verified for

correctness, reliability, and performance under simulated field conditions.

8.1.4. Performance Testing

The system shall undergo comprehensive performance evaluation to verify compliance

with specified throughput, timing, and response requirements. These tests shall assess

the efficiency, responsiveness, and scalability of the complete SIG ecosystem under

operational load conditions.

The performance testing shall include, but not be limited to, the following parameters:

I. Measurement and verification of local and remote request-response times to ensure

timely data retrieval and command execution

II. Evaluation of communication latency across all system layers, including meter-to-DCU

and DCU-to-server communication pathways

III. Assessment of user interface responsiveness, including dashboard loading time, data

refresh rates, and interaction response times under varying data loads

All measured performance parameters shall meet or exceed the thresholds defined in the

technical specifications, ensuring that the system is capable of supporting real-time

monitoring and control applications reliably and efficiently

8.2. Field Installation/Commissioning Tests:

The responsibility for planning, organizing, and successfully conducting the Field

Installation Test (FIT) shall rest entirely with the Contractor. The Contractor shall

ensure that all necessary resources, tools, test equipment, skilled personnel, and test

documentation are made available to carry out comprehensive on-site validation of

the installed system. The FIT shall be conducted in a structured and systematic manner

to verify that the installed infrastructure complies fully with the approved design,

technical specifications, and functional requirements of the project.

The Engineer-in-Charge of GEDA, or any agency duly nominated by GEDA, shall have

the right to witness all stages of testing and, where required, actively participate in

selected test procedures to independently validate system performance and

compliance. The Contractor shall provide full cooperation and access to all system

components, configurations, and logs required for such verification.

The Field Installation Test shall broadly comprise, but not be limited to, detailed visual

inspection and functional performance testing. The visual inspection shall confirm

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

correct installation practices, including proper wiring termination, cable dressing,

labeling, earthing, enclosure sealing, and overall workmanship. It shall also verify that

all installed equipment corresponds to approved specifications and is free from

physical damage or installation defects.

The functional performance test shall validate the operational integrity of all critical

system functions. This shall include verification of correct wiring and connectivity,

successful acquisition of data from energy meters and inverters, and confirmation of

accurate and continuous communication between the DCU and the central server or

Head End System (HES). The test shall further validate the proper functioning of the

user interface, ensuring that data visualization, configuration access, and reporting

features are operating as intended.

In addition, the performance of communication links, including signal strength and

stability of the ISP or communication network (such as GSM/GPRS/4G), shall be

evaluated to ensure reliable data transmission under field conditions. All hardware

components, including communication modules, processing units, and interface ports,

shall be subjected to built-in diagnostic checks to verify their health status and

operational readiness.

The exact scope, sequence, and detailed procedures of the Field Installation Test shall

be mutually finalized by the Contractor and GEDA prior to execution. This shall ensure

alignment on testing methodology, acceptance criteria, and documentation

requirements, thereby guaranteeing transparency, consistency, and completeness in

system validation prior to acceptance.

9. Key Technical Parameters of DCU/Gateway

Sr. No. Particulars / Specification Requirement

Display / Indications to provide real-

1 time operational status and facilitate LCD or LED

quick fault identification at site

2 Galvanic isolation Minimum 2000 Vrms

3 RS485 Communication Ports 2 Nos.

4 RS485 Communication Protocols RS485 / MODBUS

5 RS485 Connector Type RJ45

6 RS232 Communication Ports 2 Nos.

7 RS232 Communication Protocols RS232 DLMS Protocol

8 RS232 Connector Type RJ11

9 Baud Rate Atleast 9600 bps

10 Digital Inputs Atleast 3 Nos.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

11 Digital Outputs Atleast 3 Nos.

12 Analog Inputs (4-20mA, 0-20mA,

13 Min. 12 bit resolution universal type)

14 SIM Connectivity 4G LTE fallback to 2G/GPRS

15 SIM capability Dual SIM

16 Local Connectivity Ethernet or BLE / WiFi

17 Storage SD Card with 4 GB Memory storage

18 RTC Battery Reserve 10 years minimum

Cellular Tower, Cloud Server, GPS

19 RTC Synchronization

20 On-Chip Inbuilt,

GPS Must support GLONASS, NAViC,

Galileo or equivalent

22 3 Phase, 4 Wire AC

Works on 3 Phase & any available

25 Operating Range 63 V to 650 V AC

26 Power Supply Type Internal SMPS or External SMPS

27 Communication Protocol MQTT

28 Encryption TLS

29 Read/Write Support Both, Read & Write required

30 Mounting Screw or DIN Rail

All connections with IOT DCU/RMS

31 Connections must be connected via removable

32 Operating Temperature 0 Deg C to +50 Deg C

33 Standby Power Consumption <3W

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

FOTA (Firmware-Over-The-Air)

Wireless Upgrades

35 Remote: Over 4G

36 Local: Over BLE/WiFi

10. Installation and Commissioning

10.1. Installation and Commissioning Responsibility:

10.1.1. The Bidder shall be fully responsible for the complete installation, integration,

testing, and commissioning of the Solar IoT Gateway (SIG) at all premises where

Solar PV (SPV) systems are installed. This shall include safe unpacking of

equipment at site, physical inspection for transit damage, verification of supplied

components against packing lists, and ensuring completeness prior to

10.1.2. The SIG shall be installed at an appropriate and ergonomically suitable viewing

and maintenance height to facilitate easy access for operation, diagnostics, and

servicing. The Bidder shall carry out necessary modifications such as cutting,

rerouting, or extension of existing communication and power cables wherever

required, ensuring that all connections between SPV systems, inverters, and the

SIG are properly established.

10.1.3. All terminations, including power wiring, control wiring, and communication

cables, shall be executed in accordance with approved drawings and standards.

These connections shall be completed in the presence of the GEDA

representative or authorized engineer to ensure transparency, quality assurance,

and compliance with specifications.

10.2. Wiring, Mounting, Testing, and Commissioning Works:

10.2.1. The Contractor shall be responsible for all electrical, control, and

communication wiring associated with the SIG installation, including any

necessary rewiring or reconfiguration of existing site infrastructure to ensure

seamless integration.

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

10.2.2. The SIG shall be securely fastened and mounted at the designated location

using appropriate mounting arrangements to ensure mechanical stability,

vibration resistance, and environmental protection. Upon completion of

installation, the Contractor shall carry out comprehensive functional testing and

commissioning of the entire system, ensuring end-to-end operational readiness.

10.2.3. The scope of work shall include provisioning and use of all necessary tools,

testing equipment, consumables, and installation materials such as insulated

wires, cable lugs, ferrules, glands, fasteners, and other accessories required for

proper installation. All workmanship shall conform to industrial best practices

and safety standards.

10.3. Cable Management and Identification:

1.1.1. All cables and wires used in the installation shall be properly identified using

durable ferrules, heat-shrink sleeves, or cable tagging systems with clear and

permanent markings. The labeling system shall ensure full traceability of each

connection point, enabling easy identification during maintenance,

troubleshooting, and audits.

1.1.2. All wiring shall be neatly routed, properly dressed, and securely fastened using

high-quality cable ties of appropriate size and strength. Under no

circumstances shall loose, dangling, or unorganized wiring be permitted. Cable

routing shall ensure mechanical protection, electrical safety, and aesthetic

integrity of the installation.

10.4. Documentation and SLD Display:

1.1.3. Each Solar IoT Gateway (SIG) shall be provided with a clearly visible and

permanently affixed Single Line Diagram (SLD), depicting all internal

components, communication interfaces, and system architecture. The SLD

shall be installed inside or on the wall adjacent to the SIG enclosure using

durable, weather-resistant, and long-lasting adhesive material or laminated

sticker format.

1.1.4. The diagram shall clearly indicate all ferrules, cable tags, and terminal

identifiers along with their full forms and functional descriptions to ensure ease

of understanding for maintenance and operational personnel. The

documentation shall be legible, standardized, and resistant to environmental

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

10.5. Safety and Warning Provisions:

All necessary precautionary warnings, safety instructions, and operational advisories

shall be clearly displayed on or inside the SIG enclosure in a highly visible format with

appropriate font size, contrast, and durability. These warnings shall include electrical

safety notices, operational cautions, and any system-specific risk indications

required for safe handling and maintenance.

10.6. Port and Interface Protection Mechanism:

10.6.1. The SIG shall incorporate adequate mechanical and electrical safeguards to

prevent incorrect insertion or cross-connection of communication and interface

ports. Each communication interface, such as RS485, RS232, Ethernet, or other

serial ports, shall be physically keyed, color-coded, or uniquely designed to

eliminate the possibility of incorrect mating.

10.6.2. For example, RS485 and RS232 interfaces shall be distinctly separated in terms

of physical layout and connector design to avoid any accidental misconnection

that could lead to equipment damage or malfunction. This shall ensure

operational safety, system reliability, and protection of communication

hardware from unintended electrical faults.

10.7. Commissioning Documentation:

10.7.1. Upon successful installation and commissioning of the Solar IoT Gateway (SIG)

system, the Contractor shall prepare and submit a detailed commissioning report

to Gujarat Energy Development Agency (GEDA). The commissioning report shall

include complete details of materials/equipment installed, installation

methodology, wiring and connectivity details, device configuration parameters,

communication status, test results, and other relevant installation records as

required by GEDA.

10.7.2. The Contractor shall also capture clear photographs of each installation along

with mandatory geo-tagging/GPS coordinates and timestamp details of the

installed SIG system and associated equipment. Such geo-tagged photographic

records shall form an integral part of the commissioning documentation and shall

be submitted in digital format/report format as prescribed by GEDA.

10.7.3. GEDA reserves the right to inspect, verify, test, or audit any installed SIG system

either directly through its officials or through any agency/representative

appointed by GEDA to confirm compliance with the tender specifications,

approved designs, technical standards, workmanship requirements,

communication functionality, and operational performance. The Contractor shall

extend all necessary support, access, documents, and technical assistance during

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

such inspections/verifications. Any deficiencies, deviations, or non-compliance

observed during inspection shall be rectified by the Contractor at its own cost

within the stipulated timeline.

11. The operation, Onsite support, and maintenance.

11.1. Manpower Deployment, Technical Support, and Response Time:

The Contractor shall deploy and maintain a dedicated team of skilled and adequately

trained technical personnel possessing in-depth knowledge of the Solar IoT Gateway (SIG)

system, including hardware, firmware, communication protocols, and field integration

aspects. This team shall be responsible for timely diagnosis, troubleshooting, and

rectification of any faults or malfunctions in the SIG ecosystem, ensuring minimum

downtime and uninterrupted data acquisition.

Considering that the SIG installations are geographically distributed across all districts of

Gujarat, the Contractor shall establish a well-structured support network with

strategically located service personnel or regional support hubs. This shall ensure that any

reported fault or system issue is attended to and resolved within a maximum period of

two (2) days from the time of official reporting to the Contractor’s support system. The

Contractor shall also maintain a 24x7 helpdesk or escalation mechanism for efficient

complaint logging and tracking.

11.2. SIM Card Operational Charges:

The Contractor shall be fully responsible for bearing all recurring monthly charges

associated with the SIM cards deployed in the SIG system for communication purposes.

This shall include data charges, subscription fees, renewal costs, and any other telecom-

related expenses required to ensure uninterrupted connectivity of the system throughout

the contract period.

11.3. Continuous Monitoring and System Availability Assurance:

The Contractor shall ensure continuous monitoring of all deployed SIG assets through an

appropriate centralized monitoring platform or equivalent mechanism. This shall include

real-time tracking of device health, communication status, data flow integrity, and system

performance parameters.

The Contractor shall be fully responsible for ensuring that all installed infrastructure

remains operational and functional at all times, thereby enabling seamless and

uninterrupted data acquisition from field devices to the central system. Any degradation

in performance, communication failure, or data loss shall be proactively identified and

Tender for Design, Supply, Installation, Testing, Commissioning, and Go-Live of

Solar/Wind IIoT Gateway (SIG/WIG), including Communication Infrastructure, for

Remote Metering and Data Communication of GEDA’s Distributed Rooftop Solar

Systems and Wind Projects on a DBFOOT (Design-Build-Finance-Own-Operate-

Transfer) Basis, along with Comprehensive Operation & Maintenance (O&M) and

Insurance Coverage for a Period of 10 Years.

11.4. Maintenance, Repair, and Replacement Obligations:

The Contractor shall be responsible for the timely repair or replacement of all faulty

components, including but not limited to energy meters, SIG hardware components,

communication modules, SIM cards, and complete SIG units, as per defined service

timelines stipulated in the contract.

A comprehensive maintenance and replacement log shall be maintained by the

Contractor, documenting all repair activities, component replacements, failure reasons,

and corrective actions taken. This record shall be submitted to GEDA on a quarterly basis

for review, audit, and performance evaluation.

11.5. Spares Inventory Management:

The Contractor shall maintain an adequate minimum inventory of critical spares and

bought-out components required for the SIG system. This shall include essential hardware

such as Energy meters, communication modules, power supplies, interface boards, and

other key components necessary for uninterrupted maintenance and replacement