How much will solar panels produce in Castelo Branco?

A 5 kWp system facing south at 35° tilt in Castelo Branco produces about 8,084 kWh a year. In a weak year that is 6,772 kWh, in a good one 9,397 kWh — 1,617 kWh per kWp.

That’s about 269% of a typical home’s yearly use (3,000 kWh).

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Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 5 kWp 521 kWh, range 401–641FebFebruary: 5 kWp 570 kWh, range 442–697MarMarch: 5 kWp 686 kWh, range 539–834AprApril: 5 kWp 697 kWh, range 558–837MayMay: 5 kWp 813 kWh, range 669–957JunJune: 5 kWp 803 kWh, range 669–937JulJuly: 5 kWp 896 kWh, range 753–1,040AugAugust: 5 kWp 902 kWh, range 756–1,047SepSeptember: 5 kWp 761 kWh, range 617–904OctOctober: 5 kWp 631 kWh, range 497–766NovNovember: 5 kWp 437 kWh, range 315–559DecDecember: 5 kWp 431 kWh, range 333–528

kWh per month

A typical day in August

The sunniest month in Castelo Branco. Output peaks around 12:00 solar time, at about 3.4 kWh in the best hour.

0:006:0012:0018:0023:00 3.4 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 401 521 641
February 442 570 697
March 539 686 834
April 558 697 837
May 669 813 957
June 669 803 937
July 753 896 1,040
August 756 902 1,047
September 617 761 904
October 497 631 766
November 315 437 559
December 333 431 528
Year 6,772 8,084 9,397

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 Castelo Branco?

From November to February the system produces about 1,959 kWh, which is 24% of the year. The weakest month (December) gives roughly 431 kWh.

Is an east-west roof worth it in Castelo Branco?

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 Castelo Branco

Ground mount or roof in Castelo Branco?

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 Castelo Branco

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