Going Solar: How to Size a System and Estimate the Savings
A practical guide to home solar — understanding your usage, how many panels you need, sizing the inverter and battery, net metering, the payback period and the carbon you save.
Solar Payback Period Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Payback period
6.25
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Solar Payback Period Calculator
The Solar Payback Period Calculator works out your payback period in an instant. Enter total system cost and annual savings and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the total system cost.
- Enter the annual savings.
- Read off your payback period — the calculator updates automatically, with no button to press.
Formula
The Solar Payback Period Calculator uses the formula:
Payback period = Total system cost ÷ Annual savings
Worked example
For example, with total system cost of ₹300,000 and annual savings of ₹48,000, the payback period is 6.25.
| Total system cost | ₹300,000 |
|---|---|
| Annual savings | ₹48,000 |
| Payback period | 6.25 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Divide the system cost by annual savings. A 3,00,000 system saving 48,000 a year pays back in about 6.25 years.
Once the system has paid for itself, the ongoing savings are effectively free electricity for the rest of its life.
System cost, electricity prices, sunlight, subsidies and how much of your usage solar offsets all change the payback period.
Yes. As grid prices climb, your savings grow, which shortens the payback period compared with a fixed-price assumption.
Enter the total system cost. Enter the annual savings. Read off your payback period — the calculator updates automatically, with no button to press.
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