Solar energy in Ljubljana, Slovenia
Average irradiation 3.46 kWh/m²/day · ~1010 kWh per kWp per year
Monthly solar irradiation & temperature in Ljubljana (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 1.32 | -1.2 | 32 |
| Feb | 2.13 | -0.1 | 52 |
| Mar | 3.29 | 4.0 | 80 |
| Apr | 4.38 | 9.0 | 106 |
| May | 5.23 | 13.5 | 127 |
| Jun | 5.80 | 17.8 | 141 |
| Jul | 5.86 | 19.9 | 142 |
| Aug | 5.04 | 19.6 | 123 |
| Sep | 3.63 | 14.5 | 88 |
| Oct | 2.45 | 9.7 | 60 |
| Nov | 1.35 | 4.9 | 33 |
| Dec | 1.05 | 0.1 | 26 |
Solar potential of Ljubljana explained
Ljubljana receives an average of 3.46 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 1010 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. While winters are dark, modern panel prices mean solar can still be economical — self-consumption value matters more than raw sunshine here.
Frequently asked questions
Is solar worth it in Ljubljana?
With 3.46 kWh/m²/day of average irradiation, a 1 kWp system in Ljubljana produces roughly 1010 kWh per year. That is a moderate solar resource; economics depend more on local electricity prices and incentives, which our AI planner can research for you.
How much electricity would a 5 kW system produce in Ljubljana?
Approximately 5,000 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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