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Solar panels in Baltimore, Maryland
Baltimore receives 4.13 peak sun hours a day and 1,508 kWh/m² of solar energy a year. That is measured satellite data for Baltimore's coordinates, not a national average — and it changes the panel count.
Baltimore solar data
4.13peak sun hours/day
1,508annual irradiance (kWh/m²)
1.36kWh/day from one 400 W panel
498kWh/year from one 400 W panel
Monthly solar irradiance in Baltimore
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 1.70 | 0.1 |
| February | 3.11 | 0.3 |
| March | 3.98 | 0.3 |
| April | 4.80 | 0.4 |
| May | 5.03 | 0.4 |
| June | 6.96 | 0.6 |
| July | 6.11 | 0.5 |
| August | 5.35 | 0.4 |
| September | 4.05 | 0.3 |
| October | 3.95 | 0.3 |
| November | 2.59 | 0.2 |
| December | 1.80 | 0.1 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 39.2904, -76.6122.
How many solar panels does Baltimore need?
For a typical US household using 900 kWh a month, Baltimore needs about 22 panels of 400 W (8.80 kWp), with a south-facing roof. That is more panels than the same household would need in a city with 4.5 peak sun hours.