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Solar panels in Dallas, Texas
Dallas receives 4.74 peak sun hours a day and 1,730 kWh/m² of solar energy a year. That is measured satellite data for Dallas's coordinates, not a national average — and it changes the panel count.
Dallas solar data
4.74peak sun hours/day
1,730annual irradiance (kWh/m²)
1.57kWh/day from one 400 W panel
571kWh/year from one 400 W panel
Monthly solar irradiance in Dallas
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 2.86 | 0.2 |
| February | 3.74 | 0.3 |
| March | 4.41 | 0.4 |
| April | 4.74 | 0.4 |
| May | 5.23 | 0.4 |
| June | 6.79 | 0.6 |
| July | 6.49 | 0.5 |
| August | 6.52 | 0.5 |
| September | 5.27 | 0.4 |
| October | 4.93 | 0.4 |
| November | 3.19 | 0.3 |
| December | 2.52 | 0.2 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 32.7767, -96.797.
How many solar panels does Dallas need?
For a typical US household using 900 kWh a month, Dallas needs about 20 panels of 400 W (7.67 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.