UK Solar Panel Payback Calculator
An independent 2026 assessment of what a solar system could really save you — bill savings, SEG income, payback, ROI, lifetime savings and CO₂ reduction. Adjust every assumption; nothing is hidden.
Transparent UK assumptions from PowerGuardian.
Independent Solar Quotation Review
Want a person to read your actual quotation? Upload the document you have been given and PowerGuardian returns a written, independent review of what it covers, what is missing and what to ask the installer before you sign.
Delivered within 48 hours of a complete, in-scope submission.
See what the £125 review includesSee all your savings in one place
Enter your home details once and get personalised savings, supplier picks, recommended actions, calculators and guides on My PowerGuardian.
Figures reviewed June 2026 and updated monthly where appropriate. All results are estimates.
Your property
Region detected: East Midlands
Solar system & usage
Panel count assumes 400 W panels.
Using typical for Semi-detached: 3,300 kWh/yr
Prices & install cost
Pence per kWh.
UK average for 4.0 kWp: £6,000 (at £1500/kWp, min £3,500)
Regional yield uses 950 kWh/kWp as the UK baseline and adjusts for postcode region, orientation, pitch and shading. Results are indicative estimates, not guaranteed generation or savings.
Installation cost
£6,000
Annual generation
3,800 kWh
Bill savings / yr
£359
SEG income / yr
£408
Total annual benefit
£767
Estimated payback
7.8 yrs
Lifetime savings (25 yrs)
£19,166
CO₂ reduction (25 yrs)
19.7 t
Payback timeline
Cumulative savings vs installation cost — the crossover is your payback point.
- Cumulative savings
- Net position
Savings breakdown over 25 years
Where the value comes from at 10, 20 and 25 years.
- Bill savings
- SEG income
Personalised recommendations
- Your south-facing roof is excellent for solar — you'll capture peak generation through the middle of the day.
- Your self-consumption is estimated at ~35%. Adding a home battery could lift this to around 70–80% and materially improve payback.
- Sub-10-year payback is a strong result for UK solar in 2026. Consider adding battery storage or an EV charger to compound the benefit.
Assumptions used
Your next step
Solar saves most when paired with the right supplier and export deal. Compare current tariffs and forecasts so you're not leaving money on the roof.
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PDF · PowerGuardian · free, no email required