Solar energy in Wakayama, Japan
Average irradiation 3.86 kWh/m²/day · ~1127 kWh per kWp per year
Monthly solar irradiation & temperature in Wakayama (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.29 | 7.7 | 56 |
| Feb | 2.95 | 8.4 | 72 |
| Mar | 3.96 | 10.8 | 96 |
| Apr | 4.82 | 14.9 | 117 |
| May | 5.27 | 18.8 | 128 |
| Jun | 4.79 | 22.3 | 116 |
| Jul | 4.94 | 25.9 | 120 |
| Aug | 5.17 | 27.2 | 126 |
| Sep | 4.08 | 24.8 | 99 |
| Oct | 3.30 | 20.1 | 80 |
| Nov | 2.58 | 15.3 | 63 |
| Dec | 2.12 | 10.1 | 51 |
Solar potential of Wakayama explained
Wakayama receives an average of 3.86 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 1127 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 Wakayama?
With 3.86 kWh/m²/day of average irradiation, a 1 kWp system in Wakayama produces roughly 1127 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 Wakayama?
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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