How much will solar panels produce in Delft?

A 4 kWp system facing south at 35° tilt in Delft produces about 4,334 kWh a year. In a weak year that is 3,599 kWh, in a good one 5,070 kWh — 1,084 kWh per kWp.

That’s about 155% of a typical home’s yearly use (2,800 kWh).

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Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 4 kWp 133 kWh, range 102–165FebFebruary: 4 kWp 227 kWh, range 158–297MarMarch: 4 kWp 376 kWh, range 287–465AprApril: 4 kWp 494 kWh, range 396–591MayMay: 4 kWp 558 kWh, range 443–672JunJune: 4 kWp 549 kWh, range 453–644JulJuly: 4 kWp 534 kWh, range 429–639AugAugust: 4 kWp 513 kWh, range 422–605SepSeptember: 4 kWp 410 kWh, range 335–486OctOctober: 4 kWp 250 kWh, range 195–305NovNovember: 4 kWp 154 kWh, range 119–188DecDecember: 4 kWp 108 kWh, range 76–140

kWh per month

A typical day in May

The sunniest month in Delft. Output peaks around 11:00 solar time, at about 2.2 kWh in the best hour.

0:006:0012:0018:0023:00 2.2 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 102 133 165
February 158 227 297
March 287 376 465
April 396 494 591
May 443 558 672
June 453 549 644
July 429 534 639
August 422 513 605
September 335 410 486
October 195 250 305
November 119 154 188
December 76 108 140
Year 3,599 4,334 5,070

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 Delft?

From November to February the system produces about 622 kWh, which is 14% of the year. The weakest month (December) gives roughly 108 kWh.

Is an east-west roof worth it in Delft?

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 Delft

Ground mount or roof in Delft?

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 Delft

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