Solar Reality Check

UK plug-in solar payback estimator

Honest numbers, not solar sales fluff

Are plug-in solar panels actually worth it?

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

Build your setup

Most plug-in kits are likely to sit around 400W–800W.

800W

Include brackets, inverter, cable, delivery — the real all-in cost.

£599

Use your unit rate from your energy bill.

28p/kWh

Panel direction

Daytime usage

The bit most calculators hide

Unused solar energy

Used in your home50%

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.

Shareable result

“My plug-in solar setup saves about £95/year.”

Payback: 6.3 years. Unused energy: 50%. Verdict: Worth a serious look.