How much will solar panels produce in Brest?

A 6 kWp system facing south at 35° tilt in Brest produces about 6,802 kWh a year. In a weak year that is 5,696 kWh, in a good one 7,908 kWh — 1,134 kWh per kWp.

That’s about 145% of a typical home’s yearly use (4,700 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 6 kWp 255 kWh, range 205–305FebFebruary: 6 kWp 355 kWh, range 267–443MarMarch: 6 kWp 572 kWh, range 456–689AprApril: 6 kWp 768 kWh, range 632–903MayMay: 6 kWp 839 kWh, range 658–1,020JunJune: 6 kWp 806 kWh, range 628–985JulJuly: 6 kWp 781 kWh, range 616–945AugAugust: 6 kWp 773 kWh, range 616–929SepSeptember: 6 kWp 645 kWh, range 517–774OctOctober: 6 kWp 464 kWh, range 362–566NovNovember: 6 kWp 313 kWh, range 242–383DecDecember: 6 kWp 224 kWh, range 173–275

kWh per month

A typical day in May

The sunniest month in Brest. Output peaks around 12:00 solar time, at about 3.3 kWh in the best hour.

0:006:0012:0018:0023:00 3.3 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 205 255 305
February 267 355 443
March 456 572 689
April 632 768 903
May 658 839 1,020
June 628 806 985
July 616 781 945
August 616 773 929
September 517 645 774
October 362 464 566
November 242 313 383
December 173 224 275
Year 5,696 6,802 7,908

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 Brest?

From November to February the system produces about 1,146 kWh, which is 17% of the year. The weakest month (December) gives roughly 224 kWh.

Is an east-west roof worth it in Brest?

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 Brest

Ground mount or roof in Brest?

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 Brest

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