Solar energy in Calamba, Philippines
Average irradiation 4.64 kWh/m²/day · ~1355 kWh per kWp per year
Monthly solar irradiation & temperature in Calamba (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 3.72 | 23.7 | 91 |
| Feb | 4.51 | 24.0 | 110 |
| Mar | 5.29 | 25.4 | 129 |
| Apr | 6.08 | 27.4 | 148 |
| May | 5.71 | 28.2 | 139 |
| Jun | 5.26 | 27.3 | 128 |
| Jul | 4.72 | 26.5 | 115 |
| Aug | 4.45 | 26.4 | 108 |
| Sep | 4.64 | 26.4 | 113 |
| Oct | 4.19 | 26.0 | 102 |
| Nov | 3.80 | 25.4 | 92 |
| Dec | 3.30 | 24.5 | 80 |
Solar potential of Calamba explained
Calamba receives an average of 4.64 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 1355 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This places Calamba among the stronger solar locations globally — comparable to southern Spain or California.
Frequently asked questions
Is solar worth it in Calamba?
With 4.64 kWh/m²/day of average irradiation, a 1 kWp system in Calamba produces roughly 1355 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 Calamba?
Approximately 7,000 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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