The rooftop solar system’s cost depends on the function it performs and the subsidies/incentives available. It should be noted that all solar photovoltaic systems work by matching the voltage from another source. Therefore, the system must be integrated into the grid, a backup battery, or a diesel generator. Cost of Solar panel installation in India The standard installation fee of the solar module is about Rs. 7 per watt. System size cost per watt (in Rs.) 1 kW 7,000 Rs 2 kW 14,000 3 kW 21,000 4 kW 28,000 5 kW 35,000 6 kW 42,000 7 kW 49,000 8 kW 56,000 9 kW 63,000 10 kW 70,000 Om solar provides affordable Rooftop Solar System Cost in Kanpur for home & commercial use. We will help you save up to 80-90% on your electricity bill. This means lower costs in your pocket. We also provide a service of selling excess solar units in the grid.