Solar energy in Yokkaichi, Japan
Average irradiation 3.9 kWh/m²/day · ~1139 kWh per kWp per year
Monthly solar irradiation & temperature in Yokkaichi (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.50 | 4.2 | 61 |
| Feb | 3.20 | 5.2 | 78 |
| Mar | 4.14 | 8.3 | 101 |
| Apr | 4.88 | 13.3 | 119 |
| May | 5.19 | 18.1 | 126 |
| Jun | 4.67 | 22.1 | 114 |
| Jul | 4.85 | 26.0 | 118 |
| Aug | 5.14 | 27.0 | 125 |
| Sep | 4.01 | 23.8 | 98 |
| Oct | 3.23 | 18.1 | 78 |
| Nov | 2.69 | 12.4 | 65 |
| Dec | 2.29 | 6.7 | 56 |
Solar potential of Yokkaichi explained
Yokkaichi receives an average of 3.9 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 1139 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 Yokkaichi?
With 3.9 kWh/m²/day of average irradiation, a 1 kWp system in Yokkaichi produces roughly 1139 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 Yokkaichi?
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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