How much will solar panels produce in Bonn?

A 8 kWp system facing south at 35° tilt in Bonn produces about 8,605 kWh a year. In a weak year that is 7,113 kWh, in a good one 10,097 kWh — 1,076 kWh per kWp.

That’s about 246% of a typical home’s yearly use (3,500 kWh).

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Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 8 kWp 270 kWh, range 181–359FebFebruary: 8 kWp 475 kWh, range 327–622MarMarch: 8 kWp 735 kWh, range 532–937AprApril: 8 kWp 945 kWh, range 755–1,136MayMay: 8 kWp 1,024 kWh, range 799–1,249JunJune: 8 kWp 1,081 kWh, range 845–1,316JulJuly: 8 kWp 1,029 kWh, range 822–1,237AugAugust: 8 kWp 1,010 kWh, range 817–1,203SepSeptember: 8 kWp 822 kWh, range 642–1,002OctOctober: 8 kWp 540 kWh, range 411–668NovNovember: 8 kWp 322 kWh, range 232–412DecDecember: 8 kWp 210 kWh, range 114–307

kWh per month

A typical day in June

The sunniest month in Bonn. Output peaks around 11:00 solar time, at about 4.3 kWh in the best hour.

0:006:0012:0018:0023:00 4.3 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 181 270 359
February 327 475 622
March 532 735 937
April 755 945 1,136
May 799 1,024 1,249
June 845 1,081 1,316
July 822 1,029 1,237
August 817 1,010 1,203
September 642 822 1,002
October 411 540 668
November 232 322 412
December 114 210 307
Year 7,113 8,605 10,097

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 Bonn?

From November to February the system produces about 1,276 kWh, which is 15% of the year. The weakest month (December) gives roughly 210 kWh.

Is an east-west roof worth it in Bonn?

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 Bonn

Ground mount or roof in Bonn?

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 Bonn

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