How much electricity do solar panels make in Philadelphia, United States?
≈ 5,556 kWh a year
In Philadelphia, United States, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (30°) make about 5,556 kWh of electricity a year — 1,389 kWh for every installed kilowatt.
1,389 kWh/kWpspecific yield per year
30°best yearly panel tilt
1,453 kWh/m²yearly sunlight on level ground
Julybest month (December lowest)
Solar energy month by month in Philadelphia
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 338 | 85 |
| February | 387 | 97 |
| March | 489 | 122 |
| April | 531 | 133 |
| May | 549 | 137 |
| June | 554 | 139 |
| July | 580 | 145 |
| August | 543 | 136 |
| September | 492 | 123 |
| October | 433 | 108 |
| November | 361 | 90 |
| December | 298 | 75 |
How these numbers were calculated
NASA POWER long-term monthly means on a 1° grid around the city, the monthly method of Duffie & Beckman (isotropic sky, each month's average day), panel temperature from NOCT, 10 % other losses and a 96 % inverter. No shading, snow or product-specific data; expect ±10 % against a detailed tool such as PVGIS. To change the number of panels, their rating, tilt, direction or your roof size, use Blorp's free solar roof tool — every result shows its equation and the numbers used.