How much will solar panels produce in Dún Laoghaire?

A 4 kWp system facing south at 35° tilt in Dún Laoghaire produces about 3,957 kWh a year. In a weak year that is 3,304 kWh, in a good one 4,611 kWh — 989 kWh per kWp.

That’s about 94% of a typical home’s yearly use (4,200 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 4 kWp 151 kWh, range 116–187FebFebruary: 4 kWp 221 kWh, range 176–266MarMarch: 4 kWp 343 kWh, range 271–415AprApril: 4 kWp 443 kWh, range 340–546MayMay: 4 kWp 528 kWh, range 414–642JunJune: 4 kWp 508 kWh, range 405–611JulJuly: 4 kWp 472 kWh, range 388–555AugAugust: 4 kWp 425 kWh, range 346–504SepSeptember: 4 kWp 366 kWh, range 300–432OctOctober: 4 kWp 253 kWh, range 205–301NovNovember: 4 kWp 152 kWh, range 113–192DecDecember: 4 kWp 115 kWh, range 87–143

kWh per month

A typical day in May

The sunniest month in Dún Laoghaire. Output peaks around 12:00 solar time, at about 2.0 kWh in the best hour.

0:006:0012:0018:0023:00 2.0 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 116 151 187
February 176 221 266
March 271 343 415
April 340 443 546
May 414 528 642
June 405 508 611
July 388 472 555
August 346 425 504
September 300 366 432
October 205 253 301
November 113 152 192
December 87 115 143
Year 3,304 3,957 4,611

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 Dún Laoghaire?

From November to February the system produces about 640 kWh, which is 16% of the year. The weakest month (December) gives roughly 115 kWh.

Is an east-west roof worth it in Dún Laoghaire?

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 Dún Laoghaire

Ground mount or roof in Dún Laoghaire?

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 Dún Laoghaire

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