Sustainability

Instant, private, and free

Solar Panel Calculator.

Estimate solar array size from your energy use and your own sun-hour, panel-power, and loss assumptions.

On-device calculationNo signup

01

Set your values

Results update as you type.

02 / ANSWER

Daily energy use

Peak sun hours

Panel rated power

System losses

Required array power

5.88kW

Panels required

15

Installed array power

6.00kW

Estimated daily generation

20.40kWh/day

How to Use

Required array power = daily energy use ÷ (peak sun hours × (1 − system-loss fraction)).

Use locally measured or sourced assumptions for sun hours and losses; no location data or tariff is included.