Location data · North Rhine-Westphalia
Sun hours in Troisdorf
How sunny is Troisdorf? Over a year the sun delivers 1,290 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 3.53 peak sun hours per day in Troisdorf. In 9 out of 10 years at least 1,211 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.53 kWh/m²/d
- P90 annual total
- 1,211 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 5.7°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.27 | 2.26 | 3.52 | 4.89 | 5.10 | 5.46 | 5.31 | 4.86 | 4.24 | 2.77 | 1.60 | 1.08 |
| P90 | 0.97 | 1.57 | 2.70 | 4.13 | 4.36 | 4.61 | 4.60 | 4.23 | 3.66 | 2.31 | 1.24 | 0.75 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Troisdorf. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Troisdorf
The annual optimum for Troisdorf is 35° south; anything between 23° and 50° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 13.7 % versus the optimum. Adjusting twice a year would add 2.9 % here, monthly adjustment 3.7 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Troisdorf?
A vertical south-facing railing in Troisdorf harvests 917 kWh/m² per year — 71 % 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 117 % 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
- Bonn3.58 kWh/m²/d9 km
- Bergisch Gladbach3.47 kWh/m²/d20 km
- Köln3.51 kWh/m²/d20 km