Solar ROI Calculator
What is the payback time for UK plug-in solar?
The typical payback period for a UK 800W plug-in solar kit in 2026 is between 4.2 and 5.8 years. This is calculated based on an average energy price of £0.28/kWh and a total system cost of approximately £550. Annual savings often exceed £140.
Payback Period
4.2 - 5.8 yrs
Energy Price
£0.28/kWh
Annual Savings
£140+
System Goal
Baseload Offset
Find out exactly how much you can save with a balcony solar kit. Our calculator uses real-time 2026 energy data to estimate your payback period.
UK Solar Savings Calculator
Estimate your savings based on UK energy trends and weather.
*Calculations are estimates. Actual yield depends on orientation, shading, and local weather patterns.
Get Detailed QuoteROI Comparison Table
| Comparison Metric | 400W Single Panel | 800W Dual Panel (Max) |
|---|---|---|
| Initial Cost | £350 - £450 | £550 - £750 |
| Annual Yield (kWh) | 320 - 450 kWh | 650 - 850 kWh |
| Annual Saving (@£0.28) | £90 - £126 | £182 - £238 |
| Payback Time | ~3.8 Years | ~3.2 Years |
How We Calculate Your ROI
Our calculator takes into account the current average UK electricity price in 2026 (£0.28/kWh) and the expected annual yield of a standard 800W system.
- Average annual yield: 700kWh - 850kWh
- Standard system cost: £500 - £700
- Self-consumption rate: 80% - 100%
- System lifespan: 25+ years
Maximize Your Savings
To get the fastest payback, consider adding a small battery storage system. This allows you to use your solar energy even after the sun goes down.
View Battery Options