How much will solar panels produce in Haarlem?

A 4 kWp system facing south at 35° tilt in Haarlem produces about 4,374 kWh a year. In a weak year that is 3,639 kWh, in a good one 5,109 kWh — 1,093 kWh per kWp.

That’s about 156% of a typical home’s yearly use (2,800 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 4 kWp 129 kWh, range 97–161FebFebruary: 4 kWp 221 kWh, range 158–284MarMarch: 4 kWp 369 kWh, range 289–448AprApril: 4 kWp 503 kWh, range 402–604MayMay: 4 kWp 577 kWh, range 463–690JunJune: 4 kWp 558 kWh, range 462–655JulJuly: 4 kWp 555 kWh, range 455–654AugAugust: 4 kWp 509 kWh, range 419–600SepSeptember: 4 kWp 405 kWh, range 332–478OctOctober: 4 kWp 245 kWh, range 187–303NovNovember: 4 kWp 142 kWh, range 108–176DecDecember: 4 kWp 104 kWh, range 72–136

kWh per month

A typical day in May

The sunniest month in Haarlem. Output peaks around 11:00 solar time, at about 2.3 kWh in the best hour.

0:006:0012:0018:0023:00 2.3 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 97 129 161
February 158 221 284
March 289 369 448
April 402 503 604
May 463 577 690
June 462 558 655
July 455 555 654
August 419 509 600
September 332 405 478
October 187 245 303
November 108 142 176
December 72 104 136
Year 3,639 4,374 5,109

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 Haarlem?

From November to February the system produces about 596 kWh, which is 14% of the year. The weakest month (December) gives roughly 104 kWh.

Is an east-west roof worth it in Haarlem?

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 Haarlem

Ground mount or roof in Haarlem?

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 Haarlem

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