Location data · Baden-Württemberg
Sun hours in Achern
How sunny is Achern? Over a year the sun delivers 1,440 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 3.95 peak sun hours per day in Achern. In 9 out of 10 years at least 1,344 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.95 kWh/m²/d
- P90 annual total
- 1,344 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 3.8°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.57 | 2.59 | 4.06 | 5.27 | 5.44 | 6.03 | 5.86 | 5.39 | 4.86 | 3.07 | 1.80 | 1.33 |
| P90 | 1.26 | 1.86 | 3.08 | 4.39 | 4.57 | 5.20 | 5.10 | 4.67 | 4.28 | 2.63 | 1.40 | 0.91 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Achern. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Achern
The annual optimum for Achern is 40° south; anything between 25° and 51° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 15.9 % 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 Achern?
A vertical south-facing railing in Achern harvests 1,020 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 106 % 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
- Baden-Baden3.74 kWh/m²/d19 km
- Offenburg3.72 kWh/m²/d20 km
- Kehl3.98 kWh/m²/d20 km