How much will solar panels produce in Bratislava?

A 6 kWp system facing south at 35° tilt in Bratislava produces about 7,394 kWh a year. In a weak year that is 6,198 kWh, in a good one 8,590 kWh — 1,232 kWh per kWp.

That’s about 264% of a typical home’s yearly use (2,800 kWh).

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Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 6 kWp 251 kWh, range 203–298FebFebruary: 6 kWp 363 kWh, range 265–461MarMarch: 6 kWp 682 kWh, range 532–833AprApril: 6 kWp 777 kWh, range 631–923MayMay: 6 kWp 868 kWh, range 698–1,038JunJune: 6 kWp 936 kWh, range 765–1,106JulJuly: 6 kWp 939 kWh, range 783–1,094AugAugust: 6 kWp 855 kWh, range 695–1,015SepSeptember: 6 kWp 738 kWh, range 580–896OctOctober: 6 kWp 497 kWh, range 352–641NovNovember: 6 kWp 294 kWh, range 222–366DecDecember: 6 kWp 201 kWh, range 139–262

kWh per month

A typical day in July

The sunniest month in Bratislava. Output peaks around 11:00 solar time, at about 3.8 kWh in the best hour.

0:006:0012:0018:0023:00 3.8 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 203 251 298
February 265 363 461
March 532 682 833
April 631 777 923
May 698 868 1,038
June 765 936 1,106
July 783 939 1,094
August 695 855 1,015
September 580 738 896
October 352 497 641
November 222 294 366
December 139 201 262
Year 6,198 7,394 8,590

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 Bratislava?

From November to February the system produces about 1,108 kWh, which is 15% of the year. The weakest month (December) gives roughly 201 kWh.

Is an east-west roof worth it in Bratislava?

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 Bratislava

Ground mount or roof in Bratislava?

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 Bratislava

Your roof is not an average roof

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

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