How fast will solar refill your power station?
Panel watts, capped by what the station accepts, times your state's peak sun hours. Planned for the worst month of the year, not the average.
Last updatedOct 18, 2026
Sun hoursNREL (now NLR) PVWatts v8, read Oct 18, 2026
Solar input limitsmaker US stores, Oct 18, 2026
Result
0Wh a day
- Daylight
- Twilight
- Night
- Solar coming in
- Battery level
Peak sun hours by state
A peak sun hour is one hour of sunlight at 1,000 watts per square meter, so kWh per square meter per day reads directly as hours. These are from the PVWatts v8 API for the largest city in each state, on a fixed panel facing south and tilted at the city's latitude. A panel lying flat or propped at a steep angle in winter will see a different number. Download all 12 months as CSV.
| State | City used | Year average | Worst month | Which month |
|---|---|---|---|---|
| Alabama | Birmingham | 5.15 | 3.71 | Dec |
| Alaska | Anchorage | 3.03 | 0.55 | Dec |
| Arizona | Phoenix | 6.57 | 5.43 | Dec |
| Arkansas | Little Rock | 5.11 | 3.71 | Dec |
| California | Los Angeles | 6.09 | 4.61 | Dec |
| Colorado | Denver | 5.73 | 4.57 | Dec |
| Connecticut | Bridgeport | 4.73 | 3.08 | Dec |
| Delaware | Wilmington | 4.78 | 3.23 | Dec |
| District of Columbia | Washington | 4.79 | 3.41 | Dec |
| Florida | Jacksonville | 5.44 | 4.23 | Dec |
| Georgia | Atlanta | 5.08 | 3.87 | Dec |
| Hawaii | Honolulu | 5.77 | 4.89 | Dec |
| Idaho | Boise | 5.15 | 2.55 | Jan |
| Illinois | Chicago | 4.46 | 2.66 | Dec |
| Indiana | Indianapolis | 4.64 | 2.97 | Dec |
| Iowa | Des Moines | 4.78 | 3.34 | Dec |
| Kansas | Wichita | 5.40 | 3.95 | Dec |
| Kentucky | Louisville | 4.80 | 3.29 | Dec |
| Louisiana | New Orleans | 5.27 | 4.00 | Jan |
| Maine | Portland | 4.57 | 2.92 | Dec |
| Maryland | Baltimore | 4.88 | 3.50 | Dec |
| Massachusetts | Boston | 4.72 | 2.82 | Dec |
| Michigan | Detroit | 4.42 | 2.36 | Dec |
| Minnesota | Minneapolis | 4.66 | 2.75 | Dec |
| Mississippi | Jackson | 5.21 | 3.51 | Dec |
| Missouri | Kansas City | 5.05 | 3.72 | Dec |
| Montana | Billings | 4.80 | 2.78 | Dec |
| Nebraska | Omaha | 5.03 | 3.32 | Dec |
| Nevada | Las Vegas | 6.47 | 4.98 | Dec |
| New Hampshire | Manchester | 4.65 | 3.17 | Dec |
| New Jersey | Newark | 4.65 | 3.17 | Dec |
| New Mexico | Albuquerque | 6.48 | 5.12 | Dec |
| New York | New York City | 4.45 | 2.88 | Dec |
| North Carolina | Charlotte | 5.20 | 3.88 | Dec |
| North Dakota | Fargo | 4.47 | 2.56 | Dec |
| Ohio | Columbus | 4.53 | 2.76 | Dec |
| Oklahoma | Oklahoma City | 5.45 | 4.38 | Jan |
| Oregon | Portland | 3.97 | 1.61 | Dec |
| Pennsylvania | Philadelphia | 4.81 | 3.31 | Dec |
| Rhode Island | Providence | 4.72 | 3.23 | Dec |
| South Carolina | Charleston | 5.28 | 3.88 | Dec |
| South Dakota | Sioux Falls | 4.98 | 3.36 | Dec |
| Tennessee | Nashville | 4.77 | 3.33 | Jan |
| Texas | Houston | 5.15 | 3.76 | Dec |
| Utah | Salt Lake City | 5.38 | 3.11 | Dec |
| Vermont | Burlington | 4.38 | 2.36 | Dec |
| Virginia | Virginia Beach | 4.97 | 3.52 | Dec |
| Washington | Seattle | 3.82 | 1.59 | Dec |
| West Virginia | Charleston | 4.55 | 2.84 | Jan |
| Wisconsin | Milwaukee | 4.55 | 2.92 | Jan |
| Wyoming | Cheyenne | 5.45 | 4.20 | Dec |
Weather data: NSRDB typical-year files as named by PVWatts (PSM V3 GOES TMY 2020 for most states, PSM V4 Polar TMY 2023 for Alaska). Source: PVWatts v8 API documentation.