System size
Your monthly units consumed divided by 120 units per kW per month, rounded to the nearest 0.5 kW and limited by your roof area where provided.
Solar savings calculator
Discover what rooftop solar could save you.
A considered first estimate in under a minute — system size, savings over 25 years, PM Surya Ghar subsidy and payback, built on published government benchmarks.
- Under a minute
- Official PM Surya Ghar figures
- No sign-up required
- Subsidy open till 31 March 2027
1Property type
2Monthly units consumed
Find "Units consumed" (kWh) on your MSEDCL, Tata Power, Adani or BEST bill. For the most accurate result, use your average over the last 12 months.
3Electricity tariff
Use the energy charge printed on your bill. Most urban homes pay ₹7–₹10 per unit; if unsure, keep ₹8.
4Rooftop areaOptional
Leave blank if unsure. Each kW needs roughly 100 sq ft of shade-free space.
Recommended system
— kW
Units saved / month—
Monthly saving—
Yearly saving—
25-year saving—
Yearly generation—
CO₂ avoided / year—
Your monthly electricity from the grid
Today
——
With solar (estimated)
——
Consumption covered by solar —
Rupee figures are energy charges (units × rate). Fixed charges and taxes on your bill are not included.
Investment & subsidy
- MNRE benchmark cost
- —
- Central subsidy
- —
- Net after subsidy
- —
- Estimated payback
- —
Cumulative savings over 25 years
Cumulative savings
Net system cost
Indicative estimate only — not a quotation or a generation guarantee.
Methodology
How we calculate your estimate
Every figure is derived from published government benchmarks and conservative engineering assumptions.
Generation
4 units per kW per day — about 1,460 units a year — before site-specific shading, soiling and monsoon effects.
Savings
Units saved are the units generated, capped at 90% of your yearly consumption, multiplied by your rate per unit. Fixed charges and some grid usage typically remain.
25-year outlook
Assumes 0.7% annual panel degradation with today's tariff held constant. Any tariff increase would raise your actual savings.
Cost and subsidy
Homes use the MNRE benchmark — ₹50,000 per kW for the first 2 kW and ₹45,000 per kW thereafter — and the PM Surya Ghar subsidy schedule.
Carbon impact
Roughly 0.7 kg of CO₂ avoided per unit generated, in line with the Central Electricity Authority's grid average.
The MNRE benchmark is a government reference for the subsidy scheme, not a quotation from The Solarex. Your sanctioned load and DISCOM regulations may also limit system size.
Complimentary consultation
Speak with a solar consultant
Share a few details and our team will call you to schedule a complimentary site assessment. No payment, no OTP.
- Engineers with 6+ years' installation experience
- Branded panels, inverter and structure
- Installation within a committed timeline
- PM Surya Ghar subsidy assistance
Complimentary consultation