Peak Sun Hours in Gasteiz / Vitoria, Basque Country, Spain
- Solar zone
- Zone 2 (moderate)
- Best month
- July (6.7)
- Worst month
- December (1.5)
- Climate
- Temperate · 11.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 1.64 | 2.63 | 2.66 | 0.81 | 5.3 | 88 |
| Feb | 2.46 | 3.80 | 3.26 | 1.15 | 5.5 | 84 |
| Mar | 3.67 | 5.38 | 3.75 | 1.73 | 8.0 | 81 |
| Apr | 4.71 | 6.90 | 3.89 | 2.30 | 10.3 | 80 |
| May | 5.63 | 7.98 | 4.43 | 2.62 | 13.3 | 79 |
| Jun | 6.40 | 8.33 | 5.31 | 2.65 | 16.9 | 78 |
| Jul | 6.71 | 8.08 | 6.27 | 2.37 | 18.7 | 76 |
| Aug | 5.83 | 7.13 | 5.67 | 2.15 | 19.1 | 73 |
| Sep | 4.52 | 5.73 | 4.88 | 1.78 | 16.9 | 74 |
| Oct | 3.00 | 4.18 | 3.79 | 1.32 | 13.5 | 77 |
| Nov | 1.83 | 2.88 | 2.80 | 0.90 | 8.6 | 85 |
| Dec | 1.48 | 2.29 | 2.68 | 0.71 | 5.8 | 87 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
Add appliances
- Add an appliance to size a system.
Sizing
- Daily load
- 0.00 kWh
- Panel wattage
- 0 W
- Panel count (400W modules)
- 0
- Battery bank
- 0.0 kWh
Sizing against worst-month PSH of 1.48 kWh/m²/day, 0.77 system efficiency.
About solar in Gasteiz / Vitoria
Gasteiz / Vitoria, Spain has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 3.99 kWh/m²/day, a moderate solar resource by global standards.
The strongest month in Gasteiz / Vitoria is July (summer) at 6.71 kWh/m²/day, and the weakest is December (winter) at 1.48 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Given the moderate resource, Gasteiz / Vitoria installations typically oversize panels or combine solar with another source (grid, generator, hydro) for reliability.
FAQ
- What are the peak sun hours in Gasteiz / Vitoria?
- Gasteiz / Vitoria averages 3.99 peak sun hours per day annually, ranging from 1.48 in December to 6.71 in July.
- How many solar panels do I need in Gasteiz / Vitoria?
- Panel count depends on your daily load. At Gasteiz / Vitoria's annual average of 3.99 kWh/m²/day, a 5 kWh/day load needs roughly 5 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Gasteiz / Vitoria?
- Sizing against Gasteiz / Vitoria's worst month (December, 1.48 kWh/m²/day) with 2 days of autonomy at 80% depth of discharge, a 5 kWh/day load needs about a 12.5 kWh battery bank.
- How does Gasteiz / Vitoria's solar resource compare globally?
- Gasteiz / Vitoria sits in solar zone 2 out of 5 (where 5 is strongest) at 3.99 kWh/m²/day — moderate by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How much does winter reduce solar output in Gasteiz / Vitoria?
- Gasteiz / Vitoria's worst month (December) delivers 1.48 kWh/m²/day — about 22% of the summer peak of 6.71. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Gasteiz / Vitoria's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Gasteiz / Vitoria's 3.99 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Gasteiz / Vitoria?
- At Gasteiz / Vitoria's latitude (43°), a fixed tilt near 43° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.