Solar energy in Hiroshima, Japan
Average irradiation 3.8 kWh/m²/day · ~1110 kWh per kWp per year
Monthly solar irradiation & temperature in Hiroshima (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.15 | 1.8 | 52 |
| Feb | 2.82 | 3.0 | 69 |
| Mar | 3.89 | 6.2 | 95 |
| Apr | 4.83 | 11.4 | 117 |
| May | 5.37 | 16.5 | 131 |
| Jun | 4.78 | 20.7 | 116 |
| Jul | 4.79 | 24.5 | 116 |
| Aug | 5.07 | 25.4 | 123 |
| Sep | 4.08 | 21.5 | 99 |
| Oct | 3.41 | 15.5 | 83 |
| Nov | 2.49 | 9.6 | 61 |
| Dec | 1.92 | 4.0 | 47 |
Solar potential of Hiroshima explained
Hiroshima receives an average of 3.8 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 1110 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 Hiroshima?
With 3.8 kWh/m²/day of average irradiation, a 1 kWp system in Hiroshima produces roughly 1110 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 Hiroshima?
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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