How much electricity do solar panels make in Köln, Germany?
≈ 4,272 kWh a year
In Köln, Germany, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (35°) make about 4,272 kWh of electricity a year — 1,068 kWh for every installed kilowatt.
1,068 kWh/kWpspecific yield per year
35°best yearly panel tilt
1,085 kWh/m²yearly sunlight on level ground
Maybest month (December lowest)
Solar energy month by month in Köln
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 163 | 41 |
| February | 225 | 56 |
| March | 376 | 94 |
| April | 480 | 120 |
| May | 519 | 130 |
| June | 515 | 129 |
| July | 518 | 129 |
| August | 471 | 118 |
| September | 401 | 100 |
| October | 299 | 75 |
| November | 170 | 42 |
| December | 137 | 34 |
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.