Solar energy in Ōita, Japan
Average irradiation 3.87 kWh/m²/day · ~1130 kWh per kWp per year
Monthly solar irradiation & temperature in Ōita (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.33 | 6.9 | 57 |
| Feb | 3.04 | 8.0 | 74 |
| Mar | 4.08 | 10.5 | 99 |
| Apr | 4.87 | 14.8 | 118 |
| May | 5.22 | 18.8 | 127 |
| Jun | 4.49 | 22.2 | 109 |
| Jul | 4.81 | 25.9 | 117 |
| Aug | 5.13 | 26.7 | 125 |
| Sep | 4.11 | 23.9 | 100 |
| Oct | 3.50 | 19.3 | 85 |
| Nov | 2.66 | 14.3 | 65 |
| Dec | 2.14 | 9.1 | 52 |
Solar potential of Ōita explained
Ōita receives an average of 3.87 kilowatt-hours of solar energy per square metre per day, measured over four decades of satellite observation. In practical terms, every kilowatt-peak of installed PV capacity yields about 1130 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This is a solid mid-range solar resource: production is meaningful year-round, though winter output drops noticeably.
Frequently asked questions
Is solar worth it in Ōita?
With 3.87 kWh/m²/day of average irradiation, a 1 kWp system in Ōita produces roughly 1130 kWh per year. That is a good solar resource; with current panel prices most systems pay back well within their lifetime.
How much electricity would a 5 kW system produce in Ōita?
Approximately 6,000 kWh per year — enough to cover a large share of a typical household's consumption.
What data is this based on?
Long-term satellite observations from NASA POWER (1981–present) and the PVGIS SARAH3 database, assuming a performance ratio of 80%.
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