Calculator › San Antonio, Texas
Solar panels in San Antonio, Texas
San Antonio receives 4.83 peak sun hours a day and 1,762 kWh/m² of solar energy a year. That is measured satellite data for San Antonio's coordinates, not a national average — and it changes the panel count.
San Antonio solar data
4.83peak sun hours/day
1,762annual irradiance (kWh/m²)
1.60kWh/day from one 400 W panel
582kWh/year from one 400 W panel
Monthly solar irradiance in San Antonio
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 3.20 | 0.3 |
| February | 3.96 | 0.3 |
| March | 4.38 | 0.4 |
| April | 5.00 | 0.4 |
| May | 4.85 | 0.4 |
| June | 6.74 | 0.6 |
| July | 6.13 | 0.5 |
| August | 6.78 | 0.6 |
| September | 5.54 | 0.5 |
| October | 4.86 | 0.4 |
| November | 3.60 | 0.3 |
| December | 2.71 | 0.2 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 29.4241, -98.4936.
How many solar panels does San Antonio need?
For a typical US household using 900 kWh a month, San Antonio needs about 19 panels of 400 W (7.52 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.