Start with your latest electricity bill. Note your monthly units, sanctioned load, tariff category and consumer name. A typical home using 150 to 250 units per month often evaluates a 2 kW to 3 kW system, while larger homes may need 4 kW to 6 kW depending on appliance use and roof space.

Use the NVH Solar Calculator to prepare a first estimate for system size, subsidy readiness, bill savings and payback. Final numbers should always be confirmed after site survey and DISCOM checks.

Check the roof for shadow-free area between 9 AM and 4 PM, safe access, water tank shadows, parapet height, inverter placement, cable routing and earthing location.

For subsidy planning, keep Aadhaar-linked bank details, electricity bill, ownership or authorization documents and DISCOM consumer information ready before applying through the current residential rooftop solar process.