PROVN OF ROOFTOP SOLAR PLANT AT GUN ROCK PUMP HOUSE UNDER GE (U) SECUNDERABAD.

Design, engineering, supply, erection, installation, testing and commissioning, including synchronization with the local utility grid, of a 50 kWp Rooftop On-Grid Solar Photovoltaic (SPV) Power Plant. The system shall conform to the latest MNRE / IREDA guidelines, applicable CEA regulations, relevant IEC/IS standards, and shall comply with Domestic Content Requirement (DCR). The scope shall include all Balance of System (BOS) components, accessories, protection, and interconnections necessary for safe, efficient, and reliable operation of the plant. The system shall comprise, but not be limited to, the following major components: Solar Photovoltaic Modules:High-efficiency, DCR-compliant mono/polycrystalline PV modules.IEC 61215 / IEC 61730 certified, PID-resistant, and with minimum 25 years performance warranty. Module Mounting Structures:Hot-dip galvanized MS/Aluminium structures designed for rooftop installation.Aerodynamic, corrosion-resistant, tilt-optimized for site latitude.Wind speed resistance as per IS 875 / latest standards. DC Cabling and Array Junction Boxes / Combiner Boxes

UV-protected, weather-resistant DC cables (IEC 62930 / TUV certified). String monitoring / protection with fuses, SPD (Surge Protection Devices), isolators, and MC4 connectors. Lightning Protection and Earthing:Comprehensive lightning and surge protection for PV arrays and electrical equipment. Maintenance-free earthing system as per IS/IEC standards. Power Conditioning Unit (Central / String Inverter):Grid-tied inverter with minimum 98% efficiency, anti-islanding protection, and remote monitoring capability. Compliance with IEEE 1547 / IEC 62116 / CEA grid regulations. AC Cabling, Distribution Board & Grid Interface:AC cabling as per IS/IEC standards. Synchronization with LT grid panel including necessary breakers, isolators, meters, and protection devices. Weather Monitoring Station (WMS):Measurement of solar irradiance, module temperature, ambient temperature, wind speed, and direction. Remote Monitoring & Control System (SCADA / Data Logger):Web-based monitoring system with real-time and historical performance data. remote diagonistics, reporting and fault alerts. Balance of System (BOS) and Accessories Cable trays, conduits, junction boxes, signage, safety devices, and all other accessories required for a complete working system.

Solar Photovoltaic Modules: The proposed Solar Photovoltaic (SPV) plant shall deploy high-efficiency Mono-Crystalline Silicon modules of 540 Wp or higher capacity, optimally configured to suit the rooftop area for safe O&M. Each module shall have a minimum cell efficiency of 18% at Standard Test Conditions (STC), with a fill factor of at least 0.76, and the plant shall achieve a Performance Ratio (PR) of not less than 70% under normal operating conditions. Modules shall be designed with anodized aluminum frames for stability, IP67/IP68-rated junction boxes with bypass diodes for reliability, and high-transmittance tempered glass (>90% transmittance, optical loss <0.3%) for enhanced durability and energy gain. Make : VIKRAM solar,WAAREE, TATA,ADANI,RENEWSYS Max Peak Power Pmax : 540Wp or more, Voltage at Max Power : > 41 V, Current at Pmax: > 12 A, Short Circuit Current: > 13 A, Open Circuit Voltage: > 49 V, Module Efficiency: > 20 %

All modules shall comply with international and national standards, including IEC 61215 / IS 14286, IEC 61730 (safety), and IEC 62804 (PID resistance), as well as latest MNRE/IREDA specifications. Modules shall carry encapsulated RFID tags containing details of the manufacturer, solar cell origin, month/year of manufacturing, IV curve, and country of origin. Factory inspection shall be carried out to confirm these details, and the contractor shall intimate the inspection schedule in advance for verification of the above parameters by the officer nominated by the Accepting Officer. Electrical performance shall be guaranteed with a positive tolerance of 3–5% and no negative tolerance, a maximum power temperature coefficient of –0.50%/°C, and the ability to withstand operating conditions of 85% RH at +85°C and wind speeds up to 200 kmph. Earthing arrangements using copper earth plates shall be included in the scope, as per IS/MNRE/IREDA norms, without extra cost. The PV modules shall be DCR-compliant (Domestic Content Requirement) to align with MNRE policies.

Warranty terms include a minimum 10-year product warranty against manufacturing defects, and a performance warranty of at least 90% of rated capacity at 10 years and 80% at 25 years. The system is expected to deliver a minimum net annual generation of 1,450 kWh per kWp. Further, the contractor shall prepare the complete system design, including rooftop layout, array configuration, and module mounting arrangement, ensuring the roof is not damaged. The mounting structure design shall be robust, corrosion-resistant, and suitable for the building type. Both the shadow analysis and the mounting structure design shall be vetted and certified by a Government Engineering College before installation to ensure structural stability, technical soundness, and long-term performance reliability.

Junction Boxes : The junction boxes shall be supplied, installed, and commissioned in adequate numbers as per system design and/or OEM recommendations, with suitable input capacity and output rating. Each junction box shall have separate DC fuses for both positive and negative inputs, and an isolator on the output terminal for each string. A minimum of one spare input terminal shall be provided in every junction box. The enclosures shall be fabricated from FRP/Thermoplastic material, dust-proof, vermin-proof, water-proof, UV-resistant, and fire-retardant, with minimum protection of IP65 in compliance with IEC 62208. Junction boxes shall include surge protection devices and provision for maintenance-free earthing in accordance with relevant IS/IEC standards. Junction box shall incorporate the following technical arrangements: (a) Individual string connections to copper bus bars through suitably rated fuses. (b) DC disconnection switch for each String Junction Box (SJB) / Sub-Combiner Box (SCB). (c) Test points for each subgroup to enable quick fault location and facilitate group array isolation. (d) Suitable bypass and reverse-blocking diodes for a maximum DC blocking voltage of 1000 V, with appropriate connection arrangements. These diodes shall be designed for extreme temperature operation and must have an efficiency of not less than 99.98%, duly certified as per the applicable IEC standard.

DC Cables: DC cabling shall be carried out using solar-grade XLPE insulated, tinned copper conductor cables of minimum cross-sectional area 6 sq.mm, rated for 1100 V, and suitable for outdoor use. All cables shall be UV resistant and comply with IEC 60227, IEC 60502, IEC 62930 / IS 1554 (Part I & II) or latest standards, ensuring long-term durability under solar applications.The cables and connectors shall be of proven solar-grade quality, capable of withstanding harsh environmental conditions including high ambient temperatures, continuous UV exposure, rain, dirt, direct burial, and resistance to moss, microbes, and other atmospheric agents for a service life of minimum 25 years. All DC cables shall be provided with UV-resistant, printed ferrules for identification and maintenance.The conductor sizing shall ensure that the average voltage drop from PV module to inverter at full load does not exceed 1.5%. Interconnections between PV modules shall be routed through suitable UPVC/HDPE conduits for mechanical protection. The scope of supply shall include all interconnecting DC copper cables, MS cable trays, supports, and associated earthworks/trenches required to route solar-grade cables from the SPV modules up to the inverters. MAKE : Lapp,Havells,Polycab,Leoni,Siechem

Module Mounting Structure (MMS):The Module Mounting Structure shall be designed, supplied, and installed using hot-dip galvanized steel sections with a minimum zinc coating thickness of 85 microns. The scope shall include all necessary civil works such as PCC foundations, excavation, grouting, PCC filling, and disposal of excavated material, completed in all respects. The MMS shall be engineered to withstand a wind speed of 200 km/h, ensuring long-term mechanical stability without deformation or damage to the PV modules. For RCC rooftop installations, the array structure shall be designed so that maximum loads are transferred directly onto roof beams and columns, ensuring that the roof slab is not damaged. The layout shall minimize space usage without sacrificing SPV output, while maintaining adequate clearance between module rows for ease of cleaning and maintenance. The mounting arrangement shall be non-invasive to the roof surface, with protective measures to avoid leakage or structural distress. All nuts, bolts, and fasteners shall be stainless steel grade SS316, and each module shall be secured using at least two anti-theft fasteners fixed diagonally at opposite corners. All structural members and fasteners shall be corrosion-resistant and designed for prevailing environmental conditions.

The complete MMS design, including rooftop layout, array configuration, and shadow analysis, shall be prepared by the contractor and vetted by a Government Engineering College. In addition a STAAD Pro structural analysis report, certified by a third-party institution (IIT/NIT), shall be submitted to the Accepting Officer for approval prior to commencement of installation.

Lightning Protection for PV Array: A comprehensive lightning protection system shall be designed, supplied, and installed for the PV array, in compliance with IS/IEC 62305 (Parts 1–4). The system shall be mounted on rooftops and engineered to provide effective protection against direct lightning strikes and associated surge effects. The air terminal shall be installed at the top of a GI elevation pole with a stable base, projecting a minimum of 2 meters above the highest point of the structure to be protected. The exact height of the terminal above roof level shall be determined based on the required protection level and calculated protection radius, ensuring complete coverage of the solar PV array area. The scope shall include the supply and installation of all necessary equipment, including copper strips, down conductors, connectors, clamps, and termination hardware, routed up to the earth test point. Adequate earthing pits dedicated for lightning protection shall be provided as per relevant IS/IEC standards. The cost of all materials, earthing works, and connections for the lightning protection system shall be deemed inclusive in this item, and no extra payment shall be admissible on this account.