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
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Set your values

Results update as you type.

Required array power: 5.88 kW

Required array power

5.88kW
Panels required: 15

Panels required

15
Installed array power: 6 kW

Installed array power

6.00kW
Estimated daily generation: 20.4 kWh/day

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.