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 Savings Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Annual savings
₹48,000
- Monthly savings
- ₹4,000
- 25-year savings
- ₹12,00,000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Solar Savings Calculator
The Solar Savings Calculator works out your annual savings, along with 2 related figures in an instant. Enter current monthly electricity bill and bill offset by solar 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 current monthly electricity bill.
- Enter the bill offset by solar.
- Read off your annual savings, together with monthly savings and 25-year savings — the calculator updates automatically, with no button to press.
Formula
The Solar Savings Calculator uses the formula:
Annual savings = Current monthly electricity bill × Bill offset by solar ÷ 100 × 12
Worked example
For example, with current monthly electricity bill of ₹5,000 and bill offset by solar of 8%, the annual savings is ₹48,000.
| Current monthly electricity bill | ₹5,000 |
|---|---|
| Bill offset by solar | 8% |
| Annual savings | ₹48,000 |
|---|---|
| Monthly savings | ₹4,000 |
| 25-year savings | ₹12,00,000 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Multiply your bill by the share solar offsets. An 80% offset on a 5,000 monthly bill saves 4,000 a month, or 48,000 a year.
Solar panels are often warrantied for around 25 years, so the long-term total shows the lifetime value of the savings.
It depends on system size, usage and sunlight. Many home systems are sized to offset 70–100% of annual consumption.
No. Compare these savings with the installation cost, or use the solar payback calculator to find the break-even time.
The Solar Savings Calculator uses the formula: Annual savings = Current monthly electricity bill × Bill offset by solar ÷ 100 × 12. For example, with current monthly electricity bill of ₹5,000 and bill offset by solar of 8%, the annual savings is ₹48,000.
Enter the current monthly electricity bill. Enter the bill offset by solar. Read off your annual savings, together with monthly savings and 25-year savings — the calculator updates automatically, with no button to press.
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