Solar energy in Kashiwa, Japan
Average irradiation 3.88 kWh/m²/day · ~1133 kWh per kWp per year
Monthly solar irradiation & temperature in Kashiwa (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.81 | 2.8 | 68 |
| Feb | 3.35 | 3.9 | 81 |
| Mar | 4.11 | 7.5 | 100 |
| Apr | 4.83 | 12.9 | 118 |
| May | 5.14 | 18.1 | 125 |
| Jun | 4.56 | 21.9 | 111 |
| Jul | 4.78 | 25.8 | 116 |
| Aug | 5.00 | 26.9 | 122 |
| Sep | 3.88 | 23.1 | 94 |
| Oct | 3.07 | 17.2 | 75 |
| Nov | 2.62 | 11.2 | 64 |
| Dec | 2.46 | 5.3 | 60 |
Solar potential of Kashiwa explained
Kashiwa receives an average of 3.88 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 1133 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 Kashiwa?
With 3.88 kWh/m²/day of average irradiation, a 1 kWp system in Kashiwa produces roughly 1133 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 Kashiwa?
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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