Solar Reality Check
UK plug-in solar payback estimator
No spreadsheets. No solar jargon. Just a realistic yes/no answer in 30 seconds.
Generation
680 kWh/yr
Likely saving
£95/yr
Payback
6.3 yrs
Your realistic annual saving
£95
Worst
£76
Likely
£95
Best
£124
Worth a serious look
Your setup has a realistic payback window. The numbers look promising if the kit price is accurate.
Calculator inputs
Most plug-in kits are likely to sit around 400W–800W.
Use this as your target budget when comparing kits.
Use your unit rate from your energy bill.
Panel direction
Daytime usage
The bit most calculators hide
Used
340 kWh/yr
Likely unused
340 kWh/yr
If you run washing machines, dishwashers, dehumidifiers or charging during sunny hours, your savings improve. If the house is empty all day, payback gets worse.
Your payback depends heavily on the kit price. Compare a few sensible options before buying — cheaper kits can often beat premium ones on return.
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Shareable result
Payback: 6.3 years. Unused energy: 50%. Verdict: Worth a serious look.