How much will solar panels produce in Dortmund?

A 8 kWp system facing south at 35° tilt in Dortmund produces about 8,327 kWh a year. In a weak year that is 6,861 kWh, in a good one 9,793 kWh — 1,041 kWh per kWp.

That’s about 238% of a typical home’s yearly use (3,500 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 8 kWp 231 kWh, range 140–322FebFebruary: 8 kWp 436 kWh, range 316–557MarMarch: 8 kWp 720 kWh, range 522–918AprApril: 8 kWp 921 kWh, range 722–1,119MayMay: 8 kWp 1,060 kWh, range 840–1,279JunJune: 8 kWp 1,030 kWh, range 806–1,253JulJuly: 8 kWp 1,035 kWh, range 846–1,224AugAugust: 8 kWp 1,005 kWh, range 815–1,195SepSeptember: 8 kWp 785 kWh, range 612–957OctOctober: 8 kWp 535 kWh, range 389–681NovNovember: 8 kWp 320 kWh, range 222–418DecDecember: 8 kWp 198 kWh, range 94–302

kWh per month

A typical day in May

The sunniest month in Dortmund. Output peaks around 11:00 solar time, at about 4.2 kWh in the best hour.

0:006:0012:0018:0023:00 4.2 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 140 231 322
February 316 436 557
March 522 720 918
April 722 921 1,119
May 840 1,060 1,279
June 806 1,030 1,253
July 846 1,035 1,224
August 815 1,005 1,195
September 612 785 957
October 389 535 681
November 222 320 418
December 94 198 302
Year 6,861 8,327 9,793

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 Dortmund?

From November to February the system produces about 1,185 kWh, which is 14% of the year. The weakest month (December) gives roughly 198 kWh.

Is an east-west roof worth it in Dortmund?

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 Dortmund

Ground mount or roof in Dortmund?

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 Dortmund

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