Solar energy in Cluj-Napoca, Romania
Average irradiation 3.5 kWh/m²/day · ~1022 kWh per kWp per year
Monthly solar irradiation & temperature in Cluj-Napoca (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 1.22 | -3.0 | 30 |
| Feb | 2.00 | -0.8 | 49 |
| Mar | 3.19 | 4.1 | 77 |
| Apr | 4.45 | 10.1 | 108 |
| May | 5.30 | 15.4 | 129 |
| Jun | 5.88 | 19.4 | 143 |
| Jul | 5.87 | 21.5 | 143 |
| Aug | 5.34 | 21.6 | 130 |
| Sep | 3.79 | 16.2 | 92 |
| Oct | 2.56 | 10.0 | 62 |
| Nov | 1.46 | 4.4 | 35 |
| Dec | 0.98 | -1.4 | 24 |
Solar potential of Cluj-Napoca explained
Cluj-Napoca receives an average of 3.5 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 1022 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 Cluj-Napoca?
With 3.5 kWh/m²/day of average irradiation, a 1 kWp system in Cluj-Napoca produces roughly 1022 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 Cluj-Napoca?
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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