Location data · Rhineland-Palatinate
Sun hours in Koblenz
How sunny is Koblenz? Over a year the sun delivers 1,313 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 3.60 peak sun hours per day in Koblenz. In 9 out of 10 years at least 1,229 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.60 kWh/m²/d
- P90 annual total
- 1,229 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 6.1°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.31 | 2.33 | 3.59 | 4.98 | 5.14 | 5.49 | 5.47 | 4.96 | 4.29 | 2.83 | 1.58 | 1.14 |
| P90 | 1.07 | 1.67 | 2.85 | 4.24 | 4.51 | 4.68 | 4.90 | 4.45 | 3.69 | 2.19 | 1.24 | 0.87 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Koblenz. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Koblenz
The annual optimum for Koblenz 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 14.3 % versus the optimum. Adjusting twice a year would add 2.7 % here, monthly adjustment 3.7 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Koblenz?
A vertical south-facing railing in Koblenz harvests 933 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 114 % 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
- Neuwied3.50 kWh/m²/d12 km
- Limburg an der Lahn3.66 kWh/m²/d34 km
- Bad Neuenahr-Ahrweiler3.50 kWh/m²/d39 km