How much will solar panels produce in St. Gallen?

A 8 kWp system facing south at 35° tilt in St. Gallen produces about 8,664 kWh a year. In a weak year that is 7,172 kWh, in a good one 10,157 kWh — 1,083 kWh per kWp.

That’s about 193% of a typical home’s yearly use (4,500 kWh).

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Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 8 kWp 333 kWh, range 243–424FebFebruary: 8 kWp 528 kWh, range 430–626MarMarch: 8 kWp 792 kWh, range 595–989AprApril: 8 kWp 913 kWh, range 691–1,134MayMay: 8 kWp 922 kWh, range 740–1,103JunJune: 8 kWp 1,089 kWh, range 861–1,317JulJuly: 8 kWp 1,062 kWh, range 836–1,287AugAugust: 8 kWp 1,008 kWh, range 798–1,219SepSeptember: 8 kWp 865 kWh, range 668–1,062OctOctober: 8 kWp 652 kWh, range 502–801NovNovember: 8 kWp 337 kWh, range 223–452DecDecember: 8 kWp 306 kWh, range 138–474

kWh per month

A typical day in June

The sunniest month in St. Gallen. Output peaks around 12:00 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 243 333 424
February 430 528 626
March 595 792 989
April 691 913 1,134
May 740 922 1,103
June 861 1,089 1,317
July 836 1,062 1,287
August 798 1,008 1,219
September 668 865 1,062
October 502 652 801
November 223 337 452
December 138 306 474
Year 7,172 8,664 10,157

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 St. Gallen?

From November to February the system produces about 1,505 kWh, which is 17% of the year. The weakest month (December) gives roughly 306 kWh.

Is an east-west roof worth it in St. Gallen?

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 St. Gallen

Ground mount or roof in St. Gallen?

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 St. Gallen

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