Pvwatts Calculator

PVWatts Calculator

Estimate your solar PV system's energy production and savings.

Location (City, State/Country)

Please enter a location.

System Size (kW DC)

Enter a positive number.

Module Type

Tilt (degrees)

Tilt must be 0-90°.

Azimuth (degrees from N)

Azimuth must be 0-360°.

Electricity Rate ($/kWh)

Enter a positive rate.

System Cost ($)

Enter a positive cost.

Results

Annual Energy

0 kWh

Annual Savings

$0

Payback Period

0 years

Formula: Energy (kWh) = System Size (kW) × Hours of Sun (approx. based on location) × Efficiency Factor × (1 - System Losses). Savings = Energy × Rate. Payback = Cost / Savings.