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Solar panels in Denver, Colorado
Denver receives 4.97 peak sun hours a day and 1,816 kWh/m² of solar energy a year. That is measured satellite data for Denver's coordinates, not a national average — and it changes the panel count.
Denver solar data
4.97peak sun hours/day
1,816annual irradiance (kWh/m²)
1.64kWh/day from one 400 W panel
599kWh/year from one 400 W panel
Monthly solar irradiance in Denver
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 2.66 | 0.2 |
| February | 3.83 | 0.3 |
| March | 4.63 | 0.4 |
| April | 5.95 | 0.5 |
| May | 6.88 | 0.6 |
| June | 7.26 | 0.6 |
| July | 7.31 | 0.6 |
| August | 6.13 | 0.5 |
| September | 5.61 | 0.5 |
| October | 4.22 | 0.4 |
| November | 2.74 | 0.2 |
| December | 2.29 | 0.2 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 39.7392, -104.9903.
How many solar panels does Denver need?
For a typical US household using 900 kWh a month, Denver needs about 19 panels of 400 W (7.31 kWp), with a south-facing roof. That is fewer panels than the same household would need in a city with 4.5 peak sun hours.