How much will solar panels produce in Sion?

A 8 kWp system facing south at 35° tilt in Sion produces about 11,029 kWh a year. In a weak year that is 9,234 kWh, in a good one 12,823 kWh — 1,379 kWh per kWp.

That’s about 245% of a typical home’s yearly use (4,500 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,5002,000JanJanuary: 8 kWp 545 kWh, range 392–697FebFebruary: 8 kWp 734 kWh, range 551–917MarMarch: 8 kWp 1,066 kWh, range 848–1,283AprApril: 8 kWp 1,132 kWh, range 926–1,339MayMay: 8 kWp 1,090 kWh, range 906–1,274JunJune: 8 kWp 1,108 kWh, range 901–1,315JulJuly: 8 kWp 1,261 kWh, range 1,009–1,513AugAugust: 8 kWp 1,153 kWh, range 950–1,357SepSeptember: 8 kWp 985 kWh, range 806–1,164OctOctober: 8 kWp 844 kWh, range 670–1,017NovNovember: 8 kWp 562 kWh, range 441–683DecDecember: 8 kWp 458 kWh, range 261–655

kWh per month

A typical day in July

The sunniest month in Sion. Output peaks around 11:00 solar time, at about 4.5 kWh in the best hour.

0:006:0012:0018:0023:00 4.5 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 392 545 697
February 551 734 917
March 848 1,066 1,283
April 926 1,132 1,339
May 906 1,090 1,274
June 901 1,108 1,315
July 1,009 1,261 1,513
August 950 1,153 1,357
September 806 985 1,164
October 670 844 1,017
November 441 562 683
December 261 458 655
Year 9,234 11,029 12,823

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 Sion?

From November to February the system produces about 2,298 kWh, which is 21% of the year. The weakest month (December) gives roughly 458 kWh.

Is an east-west roof worth it in Sion?

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 Sion

Ground mount or roof in Sion?

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 Sion

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