Solar Panel Calculator

Estimate panels needed, system cost, savings, and payback period.

Monthly electricity bill ($)

Electricity rate ($/kWh)

Sun hours / day

Medium (4h) — C. Europe, N. US

Panel efficiency

Panels needed

50 panels

System size

20.0 kW

Est. install cost

$20,000–$30,000

Annual savings

$1,020/yr

Payback period

24.5 yrs

25-year savings

$500

CO₂ offset/year

1,920 kg

⚠️ These are estimates. Get a professional assessment for accurate figures.