About solar savings calculator
A rooftop solar system cuts your electricity bill for many years. The calculator estimates yearly savings, how long it takes to pay back and the benefit over 25 years.
What decides the payback
- System cost after any subsidy.
- How many units it generates, which depends on sunshine and shading.
- Your electricity rate. The higher it is, the faster the payback.
- Panels slowly lose output, by roughly half a percent a year.
Rule of thumb
In much of India, 1 kW of panels generates around 4 to 5 units a day, or 120 to 150 units a month, with a sunny, unshaded roof.
Check subsidies
Government schemes for rooftop solar change over time. Check the current eligibility and net metering rules in your state.
An illustrative example
A 3 kW system generating about 4.5 units per kW each day makes roughly 4,900 units a year. At ₹7 a unit that saves about ₹34,000 a year. If the system cost ₹1.8 lakh after subsidy, it pays for itself in about five years and then keeps saving for the rest of its 25-year life. These figures are examples, so enter your own cost and tariff.
What can lower the savings
Shade on the roof, dust on the panels, a poor angle or an inverter that fails early. Cleaning panels regularly and choosing a reputable installer protects your return.
