How much will solar panels produce in Aarau?

A 8 kWp system facing south at 35° tilt in Aarau produces about 9,415 kWh a year. In a weak year that is 7,851 kWh, in a good one 10,980 kWh — 1,177 kWh per kWp.

That’s about 209% 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 319 kWh, range 215–424FebFebruary: 8 kWp 527 kWh, range 358–696MarMarch: 8 kWp 906 kWh, range 703–1,108AprApril: 8 kWp 1,016 kWh, range 795–1,237MayMay: 8 kWp 1,020 kWh, range 831–1,208JunJune: 8 kWp 1,173 kWh, range 947–1,398JulJuly: 8 kWp 1,190 kWh, range 948–1,431AugAugust: 8 kWp 1,095 kWh, range 895–1,295SepSeptember: 8 kWp 952 kWh, range 762–1,141OctOctober: 8 kWp 655 kWh, range 493–817NovNovember: 8 kWp 354 kWh, range 271–437DecDecember: 8 kWp 257 kWh, range 167–347

kWh per month

A typical day in July

The sunniest month in Aarau. Output peaks around 12:00 solar time, at about 4.8 kWh in the best hour.

0:006:0012:0018:0023:00 4.8 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 215 319 424
February 358 527 696
March 703 906 1,108
April 795 1,016 1,237
May 831 1,020 1,208
June 947 1,173 1,398
July 948 1,190 1,431
August 895 1,095 1,295
September 762 952 1,141
October 493 655 817
November 271 354 437
December 167 257 347
Year 7,851 9,415 10,980

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 Aarau?

From November to February the system produces about 1,457 kWh, which is 15% of the year. The weakest month (December) gives roughly 257 kWh.

Is an east-west roof worth it in Aarau?

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 Aarau

Ground mount or roof in Aarau?

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 Aarau

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