Solar energy in Nagasaki, Japan
Average irradiation 3.91 kWh/m²/day · ~1142 kWh per kWp per year
Monthly solar irradiation & temperature in Nagasaki (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 2.02 | 5.9 | 49 |
| Feb | 2.85 | 7.0 | 69 |
| Mar | 3.95 | 9.7 | 96 |
| Apr | 4.86 | 14.1 | 118 |
| May | 5.17 | 18.6 | 126 |
| Jun | 4.51 | 22.2 | 110 |
| Jul | 5.32 | 26.0 | 129 |
| Aug | 5.55 | 27.0 | 135 |
| Sep | 4.47 | 23.6 | 109 |
| Oct | 3.74 | 18.4 | 91 |
| Nov | 2.56 | 13.2 | 62 |
| Dec | 1.90 | 8.0 | 46 |
Solar potential of Nagasaki explained
Nagasaki receives an average of 3.91 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 1142 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 Nagasaki?
With 3.91 kWh/m²/day of average irradiation, a 1 kWp system in Nagasaki produces roughly 1142 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 Nagasaki?
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%.
Compare with nearby cities
Dubai (5.9) · Riyadh (6) · Doha (5.8) · Tel Aviv (5.4) · Amman (5.6) · Tokyo (3.6) · all cities →