Location data · Hesse
Sun hours in Wetzlar
How sunny is Wetzlar? Over a year the sun delivers 1,349 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 3.70 peak sun hours per day in Wetzlar. In 9 out of 10 years at least 1,267 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.70 kWh/m²/d
- P90 annual total
- 1,267 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 2.3°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.39 | 2.39 | 3.77 | 5.06 | 5.25 | 5.71 | 5.57 | 5.13 | 4.38 | 2.89 | 1.60 | 1.14 |
| P90 | 1.07 | 1.74 | 3.02 | 4.30 | 4.56 | 4.73 | 4.91 | 4.55 | 3.71 | 2.40 | 1.34 | 0.92 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Wetzlar. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Wetzlar
The annual optimum for Wetzlar 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 14.2 % versus the optimum. Adjusting twice a year would add 2.7 % here, monthly adjustment 3.6 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Wetzlar?
A vertical south-facing railing in Wetzlar harvests 962 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 109 % 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
- Gießen3.72 kWh/m²/d12 km
- Dillenburg3.50 kWh/m²/d25 km
- Marburg3.56 kWh/m²/d33 km