Calculator › Phoenix, Arizona
Solar panels in Phoenix, Arizona
Phoenix receives 5.84 peak sun hours a day and 2,130 kWh/m² of solar energy a year. That is measured satellite data for Phoenix's coordinates, not a national average — and it changes the panel count.
Phoenix solar data
5.84peak sun hours/day
2,130annual irradiance (kWh/m²)
1.93kWh/day from one 400 W panel
704kWh/year from one 400 W panel
Monthly solar irradiance in Phoenix
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 3.18 | 0.3 |
| February | 4.16 | 0.3 |
| March | 5.58 | 0.5 |
| April | 7.39 | 0.6 |
| May | 8.25 | 0.7 |
| June | 8.02 | 0.7 |
| July | 7.69 | 0.6 |
| August | 6.83 | 0.6 |
| September | 6.39 | 0.5 |
| October | 5.14 | 0.4 |
| November | 3.94 | 0.3 |
| December | 3.26 | 0.3 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 33.4484, -112.074.
How many solar panels does Phoenix need?
For a typical US household using 900 kWh a month, Phoenix needs about 16 panels of 400 W (6.22 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.