Estimate only. Real production depends on your roof direction, pitch and shading.
1,000 kWh a month by state
1,000 kWh a month is 12,000 kWh a year. How many panels that takes depends on how much sun your state gets:
| State | System size | 400 W panels |
|---|---|---|
| Arizona | 6.86 kW | 18 |
| California | 7.15 kW | 18 |
| Texas | 7.96 kW | 20 |
| New York | 9.57 kW | 24 |
| Washington | 11.32 kW | 29 |
Change the state and your usage in the calculator to see your own number.
Where the production data comes from
PVWatts by the National Laboratory of the Rockies (formerly NREL), for a standard 1 kW roof system facing south at a 20° tilt with 14% losses, at each state's 2020 Census center of population.