Rooftop Solar Calculator India — PM Surya Ghar Subsidy & 25-Year ROI
Size your rooftop solar power plant, calculate your direct government DBT subsidy up to ₹78,000 under PM Surya Ghar Muft Bijli Yojana, and simulate your 25-year net savings with net metering.
Home Rooftop Solar Specifications & Roof Dimensions
Check your average summer bill.
~90–100 sq ft required per 1 kW.
Higher slab rate in your state.
Desired solar coverage level.
Rooftop Solar Financial Payback Timeline
Includes solar panels, on-grid inverter, mounting structure, bi-directional net meter, and installation.
You only pay this net amount after receiving ₹60,000 directly into your bank account.
Solar panels carry a 25-year performance warranty. After recovering costs in 3.4 years, you generate free electricity for 21+ years.
Frequently Asked Questions
Q:How much roof area is required for a 3 kW solar system in India?
A 3 kW rooftop solar system requires approximately 270 to 300 square feet of unobstructed, shadow-free roof area. Using high-efficiency Mono PERC solar panels (540W to 550W each), a 3 kW setup requires approximately 5 to 6 panels.
Q:What is the PM Surya Ghar Muft Bijli Yojana subsidy slab for 2025?
The Central Government provides direct benefit transfer (DBT) subsidies: ₹30,000 for 1 kW, ₹60,000 for 2 kW, and a maximum subsidy cap of ₹78,000 for systems of 3 kW or greater. Additional state-level subsidies may apply in Uttar Pradesh, Gujarat, Rajasthan, and Delhi on top of the central CFA.
Q:How does on-grid solar net-metering work in India?
With an on-grid system, the electricity generated during sunny daytime hours powers your home first. Any surplus power is exported back to the state electricity grid through a bi-directional net meter. At night, you draw power from the grid. At the end of the month, your DISCOM bill only charges for net imported units, effectively making excess solar generation a credit against your bill.
Q:How many units of electricity does a 3 kW solar system generate per month in India?
A 3 kW rooftop solar system in India typically generates 300 to 375 units (kWh) per month, depending on geographic location, panel tilt, and local sunshine hours. Southern states like Tamil Nadu and Karnataka receive 5.0–5.5 peak sun hours/day, generating ~450 units/month from a 3 kW plant. Northern plains average 4.5–5.0 hours, generating 390–420 units/month.
Q:Can I still install solar panels if I live in a flat or apartment in India?
Yes, but with limitations. Individual flat owners typically cannot install solar independently. However, if your Resident Welfare Association (RWA) applies collectively, you can install a community rooftop solar system on the common terrace. Group Housing Societies (GHS) are eligible for PM Surya Ghar subsidy at ₹18,000 per kW for common areas, up to 500 kW capacity. Savings are then distributed proportionally across all units.
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