Solar energy in Naha, Japan
Average irradiation 4.18 kWh/m²/day · ~1221 kWh per kWp per year
Monthly solar irradiation & temperature in Naha (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.35 | 18.9 | 57 |
| Feb | 2.95 | 19.0 | 72 |
| Mar | 3.71 | 19.8 | 90 |
| Apr | 4.37 | 21.8 | 106 |
| May | 4.81 | 24.5 | 117 |
| Jun | 5.29 | 27.0 | 129 |
| Jul | 6.37 | 28.8 | 155 |
| Aug | 5.90 | 29.0 | 143 |
| Sep | 5.07 | 28.2 | 123 |
| Oct | 4.03 | 26.2 | 98 |
| Nov | 2.94 | 23.6 | 71 |
| Dec | 2.32 | 20.6 | 57 |
Solar potential of Naha explained
Naha receives an average of 4.18 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 1221 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 Naha?
With 4.18 kWh/m²/day of average irradiation, a 1 kWp system in Naha produces roughly 1221 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 Naha?
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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