Solar energy in Iwaki, Japan
Average irradiation 3.63 kWh/m²/day · ~1060 kWh per kWp per year
Monthly solar irradiation & temperature in Iwaki (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.22 | -0.2 | 54 |
| Feb | 2.92 | 0.5 | 71 |
| Mar | 3.84 | 3.9 | 94 |
| Apr | 4.71 | 9.3 | 115 |
| May | 5.18 | 14.7 | 126 |
| Jun | 4.86 | 18.7 | 118 |
| Jul | 4.38 | 22.7 | 107 |
| Aug | 4.54 | 23.9 | 110 |
| Sep | 3.70 | 19.9 | 90 |
| Oct | 2.97 | 13.9 | 72 |
| Nov | 2.34 | 8.0 | 57 |
| Dec | 1.94 | 2.5 | 47 |
Solar potential of Iwaki explained
Iwaki receives an average of 3.63 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 1060 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 Iwaki?
With 3.63 kWh/m²/day of average irradiation, a 1 kWp system in Iwaki produces roughly 1060 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 Iwaki?
Approximately 5,000 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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