Solar Panel Calculator

Estimate your solar panel system size, cost, and savings.

Monthly Electric Bill ($)

Electricity Rate ($/kWh)

Peak Sun Hours/Day

Panel Wattage (W)

System Cost ($/Watt)

Energy Offset (%)

System Size

0 kW

0 panels

System Cost (before ITC)

After 30% Tax Credit

Annual Savings

Payback Period

0 yrs

25-Year Savings

Monthly kWh Usage

Roof Area Needed

0 sq ft

Solar Panel Sizing

System size (kW) = Monthly kWh ÷ (30 × peak sun hours × 0.8). The 30% federal Investment Tax Credit (ITC) significantly reduces costs.

Electricity.

BTU sizing.

Carbon.

ROI.

Compound.

Sq ft.