Solar Savings Calculator: How Much Can You Save in 2026?
Last updated at : Aug 13, 2026
Before spending lakhs on a rooftop system, it makes sense to know what you will get back. A solar savings calculator estimates how much your bill drops each month, how quickly the system pays for itself, and what you save across its 25-year life. You can run the same calculation by hand with a few numbers from your electricity bill. Here is the method and what the results look like for typical Indian homes and businesses in 2026.
The inputs that drive your savings
Three numbers do most of the work:
- Your monthly bill (₹) or monthly units consumed.
- Your tariff (₹/unit), which decides the value of each unit you save.
- Your recommended system size (kW), based on your consumption.
The rest is straightforward arithmetic.
The method behind the calculator
Step 1: Generation
Use the Indian rule of thumb: 1 kW generates around 4 to 4.5 units a day. So a 10 kW system produces roughly 35 to 40 units a day, or about 1,050 to 1,200 units a month.
Step 2: Monthly savings
Monthly savings = Units generated x Your tariff (capped at your consumption in a net-metered home)
A well-sized system typically cuts the bill by 70 to 90 percent. For example, a ₹10,000 monthly bill can fall to around ₹2,000 after solar, saving roughly ₹8,000 a month.
Step 3: Annual and lifetime savings
Multiply monthly savings by 12, then project across 25 years, allowing for rising tariffs. A home saving ₹8,000 a month banks roughly ₹96,000 to ₹1,00,000 in year one alone, and several lakhs over the system's life.
Worked example: a home with a ₹10,000 bill
| Item | Approximate value |
|---|---|
| Recommended system | 8 – 10 kW |
| System cost (after subsidy) | ₹3 – 5 lakh |
| Monthly generation | 1,050 – 1,200 units |
| Bill after solar | ~₹2,000 |
| Monthly savings | ~₹8,000 |
| Annual savings | ~₹1,00,000 |
| Payback period | 4 – 5 years |
| Free generation thereafter | 15 – 20 years |
Savings by bill size
| Monthly bill | Recommended system | Estimated annual savings |
|---|---|---|
| ₹5,000 | 3 – 5 kW | ₹50,000 – ₹60,000 |
| ₹10,000 | 8 – 10 kW | ₹95,000 – ₹1,10,000 |
| ₹2,00,000 (commercial) | 150 – 180 kW | ₹15 – 20 lakh |
The annual return on a typical residential system works out to roughly 20 to 25 percent, which is why solar is increasingly treated as an investment rather than just an expense.
Why your real saving may differ
A calculator gives a strong estimate, but the final figure depends on:
- Tariff slabs, since solar removes your most expensive units first.
- Daytime self-consumption, which raises the value of generation.
- Shading, dust, and orientation, which affect real output.
- Net-metering terms set by your local DISCOM.
Residential systems usually pay back in 4 to 5 years, while commercial and industrial systems, with higher tariffs and daytime loads, often recover cost in 3 to 4 years.
For sizing details and panel comparisons, see our solar blog. If you would rather not pay up front, our solar loans page shows how monthly savings can cover the EMI.
How Solnce helps
A spreadsheet estimate is a good start, but your roof, tariff, and consumption decide the real number. At Solnce Energy we calculate your exact savings from your actual data and design a residential solar system to maximise them, then handle subsidy and net-metering paperwork end to end. Get a free quote and we will run your personalised savings projection at no cost.
