Solar energy in Toyama, Japan
Average irradiation 3.57 kWh/m²/day · ~1042 kWh per kWp per year
Monthly solar irradiation & temperature in Toyama (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 1.85 | -5.2 | 45 |
| Feb | 2.60 | -4.8 | 63 |
| Mar | 3.58 | -1.1 | 87 |
| Apr | 4.59 | 5.5 | 112 |
| May | 5.25 | 11.7 | 128 |
| Jun | 4.87 | 16.1 | 119 |
| Jul | 4.54 | 20.0 | 110 |
| Aug | 4.77 | 20.8 | 116 |
| Sep | 3.81 | 16.7 | 93 |
| Oct | 3.10 | 10.3 | 75 |
| Nov | 2.24 | 4.0 | 55 |
| Dec | 1.63 | -1.9 | 40 |
Solar potential of Toyama explained
Toyama receives an average of 3.57 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 1042 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 Toyama?
With 3.57 kWh/m²/day of average irradiation, a 1 kWp system in Toyama produces roughly 1042 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 Toyama?
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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