How much will solar panels produce in Swords?

A 4 kWp system facing south at 35° tilt in Swords produces about 4,004 kWh a year. In a weak year that is 3,332 kWh, in a good one 4,675 kWh — 1,001 kWh per kWp.

That’s about 95% 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 133 kWh, range 97–168FebFebruary: 4 kWp 214 kWh, range 165–264MarMarch: 4 kWp 342 kWh, range 265–419AprApril: 4 kWp 467 kWh, range 371–563MayMay: 4 kWp 548 kWh, range 433–664JunJune: 4 kWp 510 kWh, range 408–612JulJuly: 4 kWp 472 kWh, range 383–561AugAugust: 4 kWp 425 kWh, range 349–500SepSeptember: 4 kWp 364 kWh, range 300–428OctOctober: 4 kWp 251 kWh, range 207–295NovNovember: 4 kWp 151 kWh, range 110–191DecDecember: 4 kWp 111 kWh, range 83–139

kWh per month

A typical day in May

The sunniest month in Swords. 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 97 133 168
February 165 214 264
March 265 342 419
April 371 467 563
May 433 548 664
June 408 510 612
July 383 472 561
August 349 425 500
September 300 364 428
October 207 251 295
November 110 151 191
December 83 111 139
Year 3,332 4,004 4,675

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 Swords?

From November to February the system produces about 609 kWh, which is 15% of the year. The weakest month (December) gives roughly 111 kWh.

Is an east-west roof worth it in Swords?

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 Swords

Ground mount or roof in Swords?

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 Swords

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