Solar energy in Kumamoto, Japan
Average irradiation 3.93 kWh/m²/day · ~1148 kWh per kWp per year
Monthly solar irradiation & temperature in Kumamoto (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.39 | 4.3 | 58 |
| Feb | 3.10 | 5.8 | 75 |
| Mar | 4.09 | 8.8 | 99 |
| Apr | 4.87 | 13.5 | 118 |
| May | 5.18 | 18.3 | 126 |
| Jun | 4.32 | 21.9 | 105 |
| Jul | 4.92 | 25.6 | 120 |
| Aug | 5.18 | 26.4 | 126 |
| Sep | 4.36 | 23.0 | 106 |
| Oct | 3.74 | 17.4 | 91 |
| Nov | 2.77 | 11.9 | 67 |
| Dec | 2.23 | 6.4 | 54 |
Solar potential of Kumamoto explained
Kumamoto 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 Kumamoto?
With 3.93 kWh/m²/day of average irradiation, a 1 kWp system in Kumamoto 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 Kumamoto?
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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