How much will solar panels produce in Cluj-Napoca?

A 5 kWp system facing south at 35° tilt in Cluj-Napoca produces about 6,082 kWh a year. In a weak year that is 5,095 kWh, in a good one 7,068 kWh — 1,216 kWh per kWp.

That’s about 304% of a typical home’s yearly use (2,000 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

02505007501,000JanJanuary: 5 kWp 214 kWh, range 153–274FebFebruary: 5 kWp 341 kWh, range 275–407MarMarch: 5 kWp 547 kWh, range 421–672AprApril: 5 kWp 569 kWh, range 447–691MayMay: 5 kWp 660 kWh, range 532–788JunJune: 5 kWp 691 kWh, range 550–831JulJuly: 5 kWp 731 kWh, range 604–857AugAugust: 5 kWp 738 kWh, range 610–867SepSeptember: 5 kWp 628 kWh, range 498–759OctOctober: 5 kWp 507 kWh, range 379–636NovNovember: 5 kWp 298 kWh, range 216–381DecDecember: 5 kWp 209 kWh, range 145–273

kWh per month

A typical day in August

The sunniest month in Cluj-Napoca. Output peaks around 11:00 solar time, at about 2.9 kWh in the best hour.

0:006:0012:0018:0023:00 2.9 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 153 214 274
February 275 341 407
March 421 547 672
April 447 569 691
May 532 660 788
June 550 691 831
July 604 731 857
August 610 738 867
September 498 628 759
October 379 507 636
November 216 298 381
December 145 209 273
Year 5,095 6,082 7,068

The months don’t add up exactly to the yearly figure, because each one is the typical value across many years.

Common questions

How much do solar panels produce in winter in Cluj-Napoca?

From November to February the system produces about 1,062 kWh, which is 17% of the year. The weakest month (December) gives roughly 209 kWh.

Is an east-west roof worth it in Cluj-Napoca?

An east-west system typically produces 10–25% less per kWp than one facing south, but spreads production more evenly through the day. The exact difference depends on tilt and shading.

Compare an east-west roof for Cluj-Napoca

Ground mount or roof in Cluj-Napoca?

A ground mount can be tilted and aimed freely, which can add some yield, but it costs more and needs space. Compare both for your own plot.

Check a ground-mounted system in Cluj-Napoca

Your roof is not an average roof

Set your own tilt, direction, shading and inverter limit and get a range for your address.

Calculate for my roof

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Climate data: Photovoltaic Geographical Information System (PVGIS) — European Commission, Joint Research Centre