Solar System Size Calculator
Enter your monthly electricity bill. Get your recommended system size in kW, a realistic cost estimate, and the exact PM Surya Ghar subsidy you qualify for — in under 30 seconds.
Monthly Electricity Bill
₹3,000
Your Details
How the Calculator Works
Three steps. No jargon. Just the numbers you need.
Enter your bill
Drag the slider to your average monthly electricity bill. This single number determines how much power you consume and how large your solar system needs to be.
Add your location
Your state sets the PM Surya Ghar subsidy slab. City and PIN help us match you with verified solar installers in your area.
Get your numbers
Instantly see your recommended kW size, gross installation cost, subsidy amount, and final price range after deduction. No email required.
How to Choose the Right Solar System Size
Work backwards from your monthly consumption. If your bill is ₹3,000 at ₹7.5/unit, you're consuming roughly 400 units/month — about 13 units/day. Since 1 kW solar generates 4–5 units/day under Indian conditions (4.5 peak sun hours), a 3 kW system covers this comfortably. Our calculator automates this for any bill amount.
PM Surya Ghar Subsidy: The Tier Structure
The PM Surya Ghar Yojana provides ₹30,000/kW for the first 2 kW, ₹18,000 for the third kW, and ₹9,000/kW for 3–10 kW — capped at ₹1,17,000 total. This is a post-commissioning subsidy: you pay the full cost upfront, then the subsidy is transferred to your bank account within 30–90 days after DISCOM inspection.
Solar Cost & Roof Area in India (2025)
All-in installation costs range from ₹55,000–₹70,000/kW for residential systems. A 3 kW system costs ₹1.65–2.1 lakh gross; after the ₹78,000 subsidy, net cost is ₹87,000–₹1.32 lakh. For roof space, plan for 100–110 sq ft per kW — so a 3 kW system needs ~300–330 sq ft of shadow-free area.
Know your system size? Calculate your returns.
Use the Solar Savings Calculator to see your exact payback period, 10-year and 25-year ROI, and total lifetime profit.