Solar energy in Okayama, Japan
Average irradiation 3.93 kWh/m²/day · ~1148 kWh per kWp per year
Monthly solar irradiation & temperature in Okayama (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.32 | 4.5 | 56 |
| Feb | 2.97 | 5.6 | 72 |
| Mar | 4.02 | 8.5 | 98 |
| Apr | 4.94 | 13.4 | 120 |
| May | 5.43 | 18.2 | 132 |
| Jun | 4.93 | 22.2 | 120 |
| Jul | 5.05 | 26.1 | 123 |
| Aug | 5.28 | 27.3 | 128 |
| Sep | 4.16 | 23.7 | 101 |
| Oct | 3.45 | 18.1 | 84 |
| Nov | 2.58 | 12.4 | 63 |
| Dec | 2.07 | 6.8 | 50 |
Solar potential of Okayama explained
Okayama receives an average of 3.93 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 1148 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 Okayama?
With 3.93 kWh/m²/day of average irradiation, a 1 kWp system in Okayama produces roughly 1148 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 Okayama?
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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