How much will solar panels produce in Lausanne?

A 8 kWp system facing south at 35° tilt in Lausanne produces about 9,964 kWh a year. In a weak year that is 8,302 kWh, in a good one 11,625 kWh — 1,246 kWh per kWp.

That’s about 221% of a typical home’s yearly use (4,500 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 8 kWp 399 kWh, range 257–541FebFebruary: 8 kWp 587 kWh, range 401–774MarMarch: 8 kWp 892 kWh, range 686–1,098AprApril: 8 kWp 1,030 kWh, range 815–1,246MayMay: 8 kWp 1,032 kWh, range 844–1,221JunJune: 8 kWp 1,173 kWh, range 943–1,403JulJuly: 8 kWp 1,221 kWh, range 966–1,477AugAugust: 8 kWp 1,137 kWh, range 939–1,336SepSeptember: 8 kWp 963 kWh, range 779–1,146OctOctober: 8 kWp 740 kWh, range 565–915NovNovember: 8 kWp 386 kWh, range 275–497DecDecember: 8 kWp 343 kWh, range 230–456

kWh per month

A typical day in July

The sunniest month in Lausanne. Output peaks around 11:00 solar time, at about 4.9 kWh in the best hour.

0:006:0012:0018:0023:00 4.9 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 257 399 541
February 401 587 774
March 686 892 1,098
April 815 1,030 1,246
May 844 1,032 1,221
June 943 1,173 1,403
July 966 1,221 1,477
August 939 1,137 1,336
September 779 963 1,146
October 565 740 915
November 275 386 497
December 230 343 456
Year 8,302 9,964 11,625

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 Lausanne?

From November to February the system produces about 1,715 kWh, which is 17% of the year. The weakest month (December) gives roughly 343 kWh.

Is an east-west roof worth it in Lausanne?

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 Lausanne

Ground mount or roof in Lausanne?

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 Lausanne

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