Solar Payback Calculator
Is solar worth it? Estimate payback period and lifetime savings.
Decision calculatorFully localized assumptionsCountry-specificScenario comparisonInteractive chart
Last updated: 2026-05-16
Inputs
Formula transparency
Source: defaultPayback = Cost / Net Annual Savings
Frequently asked
- Does the result include net metering?
- We cap savings at your consumption. Full net-metering credit needs an admin-configured per-country toggle.
- Where do peak sun hours come from?
- Approximate annual averages for the capital. Enter your city's value in advanced mode for more accuracy.
- On-grid vs off-grid?
- This calculator targets grid-tied systems. Off-grid needs batteries and different math.
- Does this replace an engineering study?
- No. This helps you understand feasibility. A licensed installer must do the site assessment.
- What if the utility changes tariffs?
- Payback shifts accordingly. Enter a new tariff value to see the impact.
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Results are estimates and not professional advice. Verify important decisions with a qualified professional.