Solar savings calculator
See what rooftop solar would cost and save for your home, housing society or business. Pick your state, enter your monthly bill or units, and the numbers update instantly using UVR’s current rate list and the PM Surya Ghar subsidy rules.
How it works
- Your monthly bill is divided by ₹8.5 per unit to estimate how many units you use each month.
- Units are divided by 126 (average monthly output of 1 kW) to recommend a system size, rounded to the nearest 0.5 kW for homes and 1 kW otherwise.
- System cost is the size multiplied by the per-kW price on UVR’s rate list for your state.
- Central and state subsidy are applied by connection type, giving your net cost.
- Savings count only the solar units that replace units you would buy. Payback is net cost ÷ first-year savings, and the 25-year total grows savings by 5% a year for tariff increases.
Assumptions
- Installed cost from UVR's current on-grid rate list: Gujarat ₹57,000/kW below 3 kW and ₹54,000/kW from 3 kW; all other states ₹69,100/kW.
- PM Surya Ghar central subsidy for homes: ₹30,000/kW for the first 2 kW plus ₹18,000 for the third kW, capped at ₹78,000.
- State top-up of ₹30,000 for homes in Assam, Uttarakhand, Uttar Pradesh and Delhi (UVR state + central rate list). Gujarat and other states: ₹0 extra.
- Housing societies (GHS/RWA, common facilities): ₹18,000/kW, limited to 3 kW per house and 500 kW in total.
- Commercial and industrial connections: no PM Surya Ghar subsidy; the residential rate list is used as an indicative benchmark only.
- Average generation of 126 units (kWh) per kW per month (1,512 units per kW per year).
- Electricity valued at ₹8.5 per unit. Units generated beyond your consumption are not counted as savings.
- Tariff escalation of 5% per year for the 25-year projection; panel degradation is not modelled.
- Roof area of about 70 sq ft of shadow-free roof per kW; 550 W panels.
- Final size, cost and eligibility are confirmed only after a free UVR site survey and DISCOM approval.
Frequently asked questions
How is the recommended system size calculated?
We divide your monthly bill by ₹8.5 per unit to estimate the units you use, then divide by 126 units, which is the average a 1 kW rooftop system produces in a month. Home systems are rounded to the nearest 0.5 kW. The final size is fixed only after an engineer checks your roof, shading and sanctioned load during the free site survey.
Why does the subsidy differ for homes, housing societies and businesses?
PM Surya Ghar central subsidy is for residential connections only. Homes get ₹30,000 per kW for the first 2 kW and ₹18,000 for the third kW, capped at ₹78,000. Housing societies get ₹18,000 per kW for common facilities, up to 3 kW per house and 500 kW in total. Commercial and industrial connections receive no PM Surya Ghar subsidy.
Are the 25-year savings guaranteed?
No. The 25-year figure assumes your tariff rises 5% a year and that every solar unit replaces power you would otherwise buy at ₹8.5 per unit. Actual savings depend on your DISCOM tariff, net-metering rules, how much power you use during the day, shading and weather. Treat it as a planning estimate, not a promise.
Which states get an extra state subsidy?
UVR’s current rate list adds a flat ₹30,000 state top-up for homes in Assam, Uttarakhand, Uttar Pradesh and Delhi. Gujarat and the other states in the calculator show ₹0 extra, so only the central PM Surya Ghar amount applies there. State schemes change, so we confirm the current position for your DISCOM before you sign anything.
Why is my payback different from what other installers told me?
Payback depends on the price per kW, the subsidy, the tariff you pay and how much solar power you actually use. This calculator uses UVR’s published rate list and a single average tariff, so a quote with a different price, size or tariff assumption will show a different payback. Use the quote comparison tool to line them up.