Location data · North Rhine-Westphalia
Sun hours in Kerpen
How sunny is Kerpen? Over a year the sun delivers 1,363 kilowatt-hours onto every square metre here — in June roughly 4 times as much per day as in December. “Sun hours” has two meanings: the weather report counts how long the sun shines. For solar power what matters is how much energy arrives — and that is what this page shows, as peak sun hours (hours of full sun power).
For solar planning this means: an optimally tilted, south-facing array (35°) harvests an annual average of 3.73 peak sun hours per day in Kerpen. In 9 out of 10 years at least 1,284 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.73 kWh/m²/d
- P90 annual total
- 1,284 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 1.9°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.52 | 2.54 | 3.76 | 5.03 | 5.32 | 5.58 | 5.39 | 4.94 | 4.40 | 3.04 | 1.92 | 1.32 |
| P90 | 1.00 | 1.79 | 3.07 | 4.34 | 4.58 | 4.76 | 4.78 | 4.31 | 4.02 | 2.60 | 1.54 | 0.91 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Kerpen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Kerpen
The annual optimum for Kerpen is 40° south; anything between 27° and 53° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 17.3 % versus the optimum. Adjusting twice a year would add 3.0 % here, monthly adjustment 4.1 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Kerpen?
A vertical south-facing railing in Kerpen harvests 998 kWh/m² per year — 73 % of what an optimally tilted 35° panel yields at the same spot. December softens the penalty: with the low winter sun, the vertical plane reaches 120 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →
Neighbouring places compared
- Düren3.76 kWh/m²/d16 km
- Köln3.51 kWh/m²/d19 km
- Grevenbroich3.67 kWh/m²/d26 km