How much will solar panels produce in Shannon?

A 4 kWp system facing south at 35° tilt in Shannon produces about 3,789 kWh a year. In a weak year that is 3,165 kWh, in a good one 4,414 kWh — 947 kWh per kWp.

That’s about 90% of a typical home’s yearly use (4,200 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

0200400600JanJanuary: 4 kWp 130 kWh, range 100–161FebFebruary: 4 kWp 188 kWh, range 153–223MarMarch: 4 kWp 312 kWh, range 240–384AprApril: 4 kWp 420 kWh, range 319–520MayMay: 4 kWp 499 kWh, range 401–596JunJune: 4 kWp 463 kWh, range 371–554JulJuly: 4 kWp 443 kWh, range 367–519AugAugust: 4 kWp 422 kWh, range 341–503SepSeptember: 4 kWp 327 kWh, range 261–393OctOctober: 4 kWp 236 kWh, range 190–282NovNovember: 4 kWp 152 kWh, range 118–185DecDecember: 4 kWp 106 kWh, range 80–132

kWh per month

A typical day in May

The sunniest month in Shannon. Output peaks around 11:00 solar time, at about 1.8 kWh in the best hour.

0:006:0012:0018:0023:00 1.8 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 100 130 161
February 153 188 223
March 240 312 384
April 319 420 520
May 401 499 596
June 371 463 554
July 367 443 519
August 341 422 503
September 261 327 393
October 190 236 282
November 118 152 185
December 80 106 132
Year 3,165 3,789 4,414

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 Shannon?

From November to February the system produces about 576 kWh, which is 16% of the year. The weakest month (December) gives roughly 106 kWh.

Is an east-west roof worth it in Shannon?

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 Shannon

Ground mount or roof in Shannon?

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 Shannon

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