Solar energy in Bangkok, Thailand
Average irradiation 5.23 kWh/m²/day · ~1527 kWh per kWp per year
Monthly solar irradiation & temperature in Bangkok (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 5.05 | 26.2 | 123 |
| Feb | 5.49 | 28.8 | 134 |
| Mar | 5.70 | 30.2 | 139 |
| Apr | 6.06 | 30.7 | 147 |
| May | 5.54 | 29.5 | 135 |
| Jun | 5.33 | 28.4 | 130 |
| Jul | 5.14 | 27.8 | 125 |
| Aug | 5.12 | 27.6 | 124 |
| Sep | 4.92 | 27.2 | 120 |
| Oct | 4.72 | 26.9 | 115 |
| Nov | 4.86 | 25.9 | 118 |
| Dec | 4.88 | 24.9 | 119 |
Solar potential of Bangkok explained
Bangkok receives an average of 5.23 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 1527 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This places Bangkok among the stronger solar locations globally — comparable to southern Spain or California.
Frequently asked questions
Is solar worth it in Bangkok?
With 5.23 kWh/m²/day of average irradiation, a 1 kWp system in Bangkok produces roughly 1527 kWh per year. That is an excellent solar resource — payback periods are typically among the shortest worldwide.
How much electricity would a 5 kW system produce in Bangkok?
Approximately 8,000 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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