Solar Payback Calculator
Estimate your annual savings and break-even point in seconds. Updated for 2026 Energy Prices & SEG Rates
Solar ROI Calculator
Estimating for you:
- System Size: 4 kW
- Est. Cost: £6,500
- Consumption: 50%
Payback Period
0.0 Years
Annual Return
£0
*Estimates only. Actual savings depend on weather, accurate usage, and installation quality. Based on UK average irradiance (850 kWh/kWp).
Advanced mode allows full customization of rates.
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Methodology
This calculator uses the following assumptions:
- Generation: 850 kWh per kWp installed (UK Average).
- Inflation: Electricity prices assumed to rise with inflation (approx 2-3%).
- Degradation: Panel efficiency loss of ~0.5% per year included.