Solar calculator
What will solar save you?
Four quick questions. You’ll see your recommended system size, cost, subsidy, monthly saving and payback straight away, no sign-up needed.
Your estimate
Your roof could cover 100% of your bill.
3 kW
recommended system
- Panels (550 W)
- 0
- Roof space needed
- 0
- Monthly generation
- 0
- System cost (before subsidy)
- 0
- Central subsidy
- 0
- Net cost to you
- 0
- Monthly saving
- 0
- Payback
- 0
- 25-year saving
- 0
- CO₂ avoided / year
- 0
- Trees equivalent
- 0
Estimate only, based on typical tariffs, regional sunshine and market price ranges. Savings cover energy charges; fixed and meter charges on your bill remain. Final figures after a site survey. See assumptions
Detailed report
Get the full PDF report on WhatsApp.
- Month-by-month generation for your state
- Brand-neutral equipment options and price bands
- Subsidy steps and documents for your case
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How we calculate
Honest numbers, open assumptions.
Every figure above comes from the assumptions below. They are deliberately conservative; your site survey replaces them with real measurements.
Assumptions used by this calculator
Sunshine (generation per kW per day)
- Rajasthan, Gujarat, Ladakh: 4.6 kWh
- Central (MP, Maharashtra, Chhattisgarh): 4.3 kWh
- South: 4.2 kWh
- North (incl. default): 4 kWh
- East: 3.9 kWh
- North-east: 3.5 kWh
- Hill states: 3.8 kWh
Tariff used to convert a bill into units
- Home: ₹7.5 per unit
- Business: ₹9.5 per unit
- Farm: ₹6 per unit
- Society: ₹8 per unit
Installed cost range, before subsidy
- Home: ₹55,000–₹70,000 per kW
- Business: ₹42,000–₹52,000 per kW
- Farm: ₹50,000–₹65,000 per kW
- Society: ₹48,000–₹58,000 per kW
Subsidy
- Homes (PM Surya Ghar): ₹30,000/kW for the first 2 kW, ₹18,000 for the 3rd kW, capped at ₹78,000
- Housing societies: ₹18,000/kW for common facilities, up to 500 kW
- Farms: via PM-KUSUM; shares vary by state, so not included in the net cost
- Businesses: no central capital subsidy included
Other
- Panel size: 550 W · Roof space: 100 sq ft per kW · System size rounded up to the nearest 0.5 kW
- Savings assume net-metering credits solar units up to your consumption; exports beyond that are not counted
- Savings count energy charges only: about 85% of a typical bill; fixed, meter and duty charges remain
- Panel degradation 0.5% per year; no tariff increase assumed (conservative)
- CO₂: 0.716 kg per kWh (CEA grid factor, approx.) · 21 kg CO₂ absorbed per tree per year
Subsidy slabs checked 9 Nov 2026 against published scheme summaries; re-verify at pmsuryaghar.gov.in. Tariffs and prices vary by DISCOM, brand and site.
Want exact numbers for your roof?
A free site survey measures your roof, maps shade and turns this estimate into a firm design and quote comparison.