Peak Sun Hours in Acilia-Castel Fusano-Ostia Antica, Lazio, Italy
- Solar zone
- Zone 3 (good)
- Best month
- July (7.6)
- Worst month
- December (1.6)
- Climate
- Temperate · 15.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 1.82 | 2.61 | 2.86 | 0.84 | 7.0 | 81 |
| Feb | 2.77 | 3.72 | 3.68 | 1.18 | 7.6 | 79 |
| Mar | 4.05 | 5.23 | 4.28 | 1.70 | 10.3 | 76 |
| Apr | 5.46 | 6.69 | 5.23 | 2.09 | 13.9 | 72 |
| May | 6.64 | 7.77 | 6.23 | 2.34 | 18.0 | 68 |
| Jun | 7.49 | 8.21 | 7.56 | 2.17 | 22.8 | 62 |
| Jul | 7.59 | 7.97 | 8.36 | 1.78 | 26.0 | 55 |
| Aug | 6.60 | 7.01 | 7.49 | 1.67 | 26.1 | 55 |
| Sep | 4.84 | 5.59 | 5.44 | 1.64 | 21.4 | 64 |
| Oct | 3.34 | 4.09 | 4.27 | 1.32 | 17.2 | 73 |
| Nov | 2.05 | 2.81 | 2.98 | 0.95 | 12.4 | 80 |
| Dec | 1.64 | 2.27 | 2.79 | 0.75 | 8.1 | 81 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
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- 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 1.64 kWh/m²/day, 0.77 system efficiency.
About solar in Acilia-Castel Fusano-Ostia Antica
Acilia-Castel Fusano-Ostia Antica, Italy has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 4.52 kWh/m²/day, a good solar resource by global standards.
The strongest month in Acilia-Castel Fusano-Ostia Antica is July (summer) at 7.59 kWh/m²/day, and the weakest is December (winter) at 1.64 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.
Acilia-Castel Fusano-Ostia Antica'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 Acilia-Castel Fusano-Ostia Antica?
- Acilia-Castel Fusano-Ostia Antica averages 4.52 peak sun hours per day annually, ranging from 1.64 in December to 7.59 in July.
- How many solar panels do I need in Acilia-Castel Fusano-Ostia Antica?
- Panel count depends on your daily load. At Acilia-Castel Fusano-Ostia Antica's annual average of 4.52 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 Acilia-Castel Fusano-Ostia Antica?
- Sizing against Acilia-Castel Fusano-Ostia Antica's worst month (December, 1.64 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 Acilia-Castel Fusano-Ostia Antica's solar resource compare globally?
- Acilia-Castel Fusano-Ostia Antica sits in solar zone 3 out of 5 (where 5 is strongest) at 4.52 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 Acilia-Castel Fusano-Ostia Antica?
- Acilia-Castel Fusano-Ostia Antica's worst month (December) delivers 1.64 kWh/m²/day — about 22% of the summer peak of 7.59. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Acilia-Castel Fusano-Ostia Antica's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Acilia-Castel Fusano-Ostia Antica's 4.52 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Acilia-Castel Fusano-Ostia Antica?
- At Acilia-Castel Fusano-Ostia Antica's latitude (42°), a fixed tilt near 42° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.