Solar Savings Calculator
Would solar actually pay off for you? Enter your usage, local sun hours, and an installed price, and see your estimated annual savings, payback period, and 25-year return — instantly.
Reviewed by MyEnergyToolkit Editorial Team · Updated July 24, 2026 · Methodology & sources
Or estimate: monthly bill ÷ rate.
Leave blank to auto-size to your usage.
Share of your usage solar can realistically cover.
Estimated annual savings
$0
with a 0 kW system
Estimates only — not financial advice. Actual savings depend on your roof, shading, tariff, and net-metering rules. Get a professional assessment before buying.
The next step: get real quotes
The numbers above are estimates. The only way to know exactly what solar costs on your roof is a real quote — and comparing three from local installers is the single best way to avoid overpaying. Look for installers certified in your region, ask each for the system size, total price, and estimated annual production, then check their production figure against the solar output estimator.
How to calculate solar panel savings
Estimate the solar electricity that your home can use or receive credit for, then multiply those kWh by the value of each kWh. In simple form: annual solar savings = credited solar kWh × electricity value per kWh. Subtract incentives from installation cost before calculating payback. Fixed utility charges normally remain even when solar offsets most energy use.
Solar panel savings per year: worked examples
This table uses a 6 kW system, 4.5 peak sun hours, a 0.78 performance ratio and about 7,686 kWh of annual production. It assumes every generated kWh offsets electricity at the listed retail rate. Real export compensation and self-consumption rules may produce a lower value.
| Electricity value | Estimated annual savings | Simple payback on $9,800 net cost |
|---|---|---|
| $0.12/kWh | $922 | 10.6 years |
| $0.18/kWh | $1,383 | 7.1 years |
| $0.25/kWh | $1,922 | 5.1 years |
| $0.35/kWh | $2,690 | 3.6 years |
Solar panel cost vs savings
A lower quote is not automatically the best deal: compare net installed cost, expected annual production, equipment warranties and the tariff value of self-consumed and exported electricity. Use the same assumptions for every proposal so installers are compared on equal terms.
How to maximize solar savings
- Move flexible consumption, such as laundry or EV charging, into sunny hours when exported electricity is worth less than imported electricity.
- Reduce shading and confirm production estimates against a location-specific solar model.
- Compare multiple installed-price quotes using cost per system watt and expected annual kWh.
- Check current utility export, time-of-use and fixed-charge rules before buying.
- Size for realistic future loads without paying for production that receives little export value.
How this solar savings calculator works
It estimates production with the industry-standard formula: annual kWh = system kW × peak sun hours × 365 × 0.78, where 0.78 is a typical performance ratio covering inverter losses, temperature, wiring, and soiling. Savings are the offset kWh (capped at your usage × offset %) multiplied by your rate. Payback is net cost after incentives divided by annual savings, and the 25-year figure is simple savings × 25 minus net cost — conservative, since it ignores electricity price inflation.
If you leave system size blank, the calculator sizes a system to cover your annual usage, the same approach as our solar panel size calculator.
Solar savings FAQ
How much can solar panels save me per year?
Annual savings equal the solar electricity you actually offset multiplied by your price per kWh. A typical 6 kW system in a region with 4.5 peak sun hours produces roughly 7,700 kWh a year; at $0.15/kWh that's around $1,100–1,200 per year, capped by how much of your usage the system can cover.
How is solar payback period calculated?
Payback = net system cost (after rebates and tax credits) divided by annual savings. If a system costs $14,000, incentives cover 30% ($4,200), and it saves $1,400 a year, payback is $9,800 ÷ $1,400 = 7 years. Typical residential paybacks run 6–12 years.
What are peak sun hours?
Peak sun hours measure daily solar energy as equivalent hours of full-strength sun (1,000 W/m²). Cloudy northern regions get 3–3.5; temperate areas 4–4.5; sunny and desert regions 5–6.5. Your region's figure drives how much a given system produces.
Why doesn't solar cover 100% of my bill?
Production peaks at midday while usage often peaks mornings and evenings, and export credits are usually worth less than retail rates. Fixed standing charges also remain. That's why the calculator defaults to a 90% offset — adjust it to your utility's net-metering rules.
Is this solar calculator accurate?
It uses the standard estimate — production = system kW × peak sun hours × 365 × 0.78 performance ratio — which is a solid planning figure. A local installer's shade and roof analysis gives the final number; results here are estimates, not financial advice.