How much will solar panels produce in Brussel?

A 5 kWp system facing south at 35° tilt in Brussel produces about 5,340 kWh a year. In a weak year that is 4,422 kWh, in a good one 6,258 kWh — 1,068 kWh per kWp.

That’s about 153% of a typical home’s yearly use (3,500 kWh).

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Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 5 kWp 172 kWh, range 127–217FebFebruary: 5 kWp 278 kWh, range 196–359MarMarch: 5 kWp 464 kWh, range 347–580AprApril: 5 kWp 618 kWh, range 494–742MayMay: 5 kWp 659 kWh, range 526–791JunJune: 5 kWp 671 kWh, range 544–798JulJuly: 5 kWp 633 kWh, range 503–764AugAugust: 5 kWp 618 kWh, range 503–733SepSeptember: 5 kWp 543 kWh, range 443–643OctOctober: 5 kWp 335 kWh, range 260–411NovNovember: 5 kWp 220 kWh, range 168–272DecDecember: 5 kWp 144 kWh, range 85–202

kWh per month

A typical day in June

The sunniest month in Brussel. Output peaks around 11:00 solar time, at about 2.7 kWh in the best hour.

0:006:0012:0018:0023:00 2.7 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 127 172 217
February 196 278 359
March 347 464 580
April 494 618 742
May 526 659 791
June 544 671 798
July 503 633 764
August 503 618 733
September 443 543 643
October 260 335 411
November 168 220 272
December 85 144 202
Year 4,422 5,340 6,258

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 Brussel?

From November to February the system produces about 814 kWh, which is 15% of the year. The weakest month (December) gives roughly 144 kWh.

Is an east-west roof worth it in Brussel?

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 Brussel

Ground mount or roof in Brussel?

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 Brussel

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