Solar energy in Perth, Australia
Average irradiation 5.54 kWh/m²/day · ~1618 kWh per kWp per year
Monthly solar irradiation & temperature in Perth (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 8.19 | 22.8 | 199 |
| Feb | 7.33 | 23.4 | 178 |
| Mar | 6.08 | 22.5 | 148 |
| Apr | 4.45 | 20.4 | 108 |
| May | 3.35 | 18.4 | 81 |
| Jun | 2.75 | 16.7 | 67 |
| Jul | 2.90 | 15.7 | 71 |
| Aug | 3.75 | 15.6 | 91 |
| Sep | 5.04 | 15.8 | 123 |
| Oct | 6.54 | 17.3 | 159 |
| Nov | 7.75 | 19.3 | 189 |
| Dec | 8.41 | 21.2 | 205 |
Solar potential of Perth explained
Perth receives an average of 5.54 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 1618 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This places Perth among the stronger solar locations globally — comparable to southern Spain or California.
Frequently asked questions
Is solar worth it in Perth?
With 5.54 kWh/m²/day of average irradiation, a 1 kWp system in Perth produces roughly 1618 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 Perth?
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%.
Compare with nearby cities
Sydney (4.7) · Melbourne (4.2) · Auckland (4) · Brisbane (5.4) · Adelaide (4.7) · Gold Coast (5.3) · all cities →