Location data · North Rhine-Westphalia
Sun hours in Dormagen
How sunny is Dormagen? Over a year the sun delivers 1,332 kilowatt-hours onto every square metre here — in June roughly 5 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 3.65 peak sun hours per day in Dormagen. In 9 out of 10 years at least 1,264 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.65 kWh/m²/d
- P90 annual total
- 1,264 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) | 1.44 | 2.39 | 3.65 | 4.96 | 5.29 | 5.54 | 5.35 | 4.91 | 4.29 | 2.90 | 1.78 | 1.22 |
| P90 | 1.13 | 1.72 | 2.91 | 4.20 | 4.61 | 4.61 | 4.74 | 4.31 | 3.73 | 2.48 | 1.45 | 0.92 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Dormagen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Dormagen
The annual optimum for Dormagen is 40° south; anything between 26° and 53° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 17.2 % versus the optimum. Adjusting twice a year would add 3.2 % here, monthly adjustment 4.0 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Dormagen?
A vertical south-facing railing in Dormagen harvests 972 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
- Düsseldorf3.54 kWh/m²/d15 km
- Grevenbroich3.67 kWh/m²/d17 km
- Solingen3.41 kWh/m²/d20 km