Location data · Lower Saxony
Sun hours in Wilhelmshaven
How sunny is Wilhelmshaven? Over a year the sun delivers 1,238 kilowatt-hours onto every square metre here — in June roughly 6 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 3.39 peak sun hours per day in Wilhelmshaven. In 9 out of 10 years at least 1,188 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.39 kWh/m²/d
- P90 annual total
- 1,188 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 1.5°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.04 | 2.00 | 3.36 | 4.95 | 5.22 | 5.41 | 5.15 | 4.77 | 3.91 | 2.57 | 1.34 | 0.90 |
| P90 | 0.81 | 1.51 | 2.81 | 3.97 | 4.43 | 4.87 | 4.65 | 4.13 | 3.33 | 2.11 | 1.10 | 0.73 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Wilhelmshaven. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Wilhelmshaven
The annual optimum for Wilhelmshaven is 40° south; anything between 24° and 52° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 15.3 % versus the optimum. Adjusting twice a year would add 2.5 % here, monthly adjustment 3.5 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Wilhelmshaven?
A vertical south-facing railing in Wilhelmshaven harvests 899 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 115 % 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
- Varel3.39 kWh/m²/d17 km
- Wittmund3.35 kWh/m²/d22 km
- Bremerhaven3.44 kWh/m²/d31 km