Peak Sun Hours in Zaragoza, Aragon, Spain
- Solar zone
- Zone 3 (good)
- Best month
- July (7.5)
- Worst month
- December (1.8)
- Climate
- Temperate · 14.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.03 | 2.75 | 3.55 | 0.85 | 6.1 | 78 |
| Feb | 3.09 | 3.90 | 4.61 | 1.16 | 6.7 | 73 |
| Mar | 4.37 | 5.44 | 5.05 | 1.71 | 10.2 | 67 |
| Apr | 5.53 | 6.91 | 5.25 | 2.22 | 13.4 | 64 |
| May | 6.63 | 7.94 | 6.02 | 2.48 | 17.4 | 60 |
| Jun | 7.33 | 8.29 | 6.85 | 2.48 | 22.4 | 54 |
| Jul | 7.47 | 8.01 | 7.47 | 2.22 | 25.1 | 50 |
| Aug | 6.49 | 7.08 | 6.68 | 2.05 | 24.9 | 49 |
| Sep | 5.03 | 5.70 | 5.58 | 1.77 | 20.5 | 58 |
| Oct | 3.47 | 4.22 | 4.57 | 1.32 | 15.9 | 66 |
| Nov | 2.27 | 2.98 | 3.77 | 0.93 | 9.7 | 75 |
| Dec | 1.75 | 2.40 | 3.28 | 0.76 | 6.4 | 78 |
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 1.75 kWh/m²/day, 0.77 system efficiency.
About solar in Zaragoza
Zaragoza, Spain has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.62 kWh/m²/day, a good solar resource by global standards.
The strongest month in Zaragoza is July (summer) at 7.47 kWh/m²/day, and the weakest is December (winter) at 1.75 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.
Zaragoza's solar conditions are well within the range where off-grid PV is a straightforward engineering exercise with standard-sized arrays and lithium batteries.
FAQ
- What are the peak sun hours in Zaragoza?
- Zaragoza averages 4.62 peak sun hours per day annually, ranging from 1.75 in December to 7.47 in July.
- How many solar panels do I need in Zaragoza?
- Panel count depends on your daily load. At Zaragoza's annual average of 4.62 kWh/m²/day, a 5 kWh/day load needs roughly 4 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Zaragoza?
- Sizing against Zaragoza's worst month (December, 1.75 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 Zaragoza's solar resource compare globally?
- Zaragoza sits in solar zone 3 out of 5 (where 5 is strongest) at 4.62 kWh/m²/day — good 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 Zaragoza?
- Zaragoza's worst month (December) delivers 1.75 kWh/m²/day — about 23% of the summer peak of 7.47. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Zaragoza's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Zaragoza's 4.62 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Zaragoza?
- At Zaragoza's latitude (42°), a fixed tilt near 42° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.