How much will solar panels produce in Santarém?

A 5 kWp system facing south at 35° tilt in Santarém produces about 8,191 kWh a year. In a weak year that is 6,857 kWh, in a good one 9,525 kWh — 1,638 kWh per kWp.

That’s about 273% 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 513 kWh, range 392–634FebFebruary: 5 kWp 535 kWh, range 412–658MarMarch: 5 kWp 700 kWh, range 549–850AprApril: 5 kWp 689 kWh, range 536–842MayMay: 5 kWp 818 kWh, range 679–956JunJune: 5 kWp 798 kWh, range 661–935JulJuly: 5 kWp 886 kWh, range 737–1,036AugAugust: 5 kWp 895 kWh, range 750–1,040SepSeptember: 5 kWp 771 kWh, range 623–920OctOctober: 5 kWp 604 kWh, range 480–727NovNovember: 5 kWp 425 kWh, range 306–544DecDecember: 5 kWp 446 kWh, range 348–543

kWh per month

A typical day in August

The sunniest month in Santarém. Output peaks around 11:00 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 392 513 634
February 412 535 658
March 549 700 850
April 536 689 842
May 679 818 956
June 661 798 935
July 737 886 1,036
August 750 895 1,040
September 623 771 920
October 480 604 727
November 306 425 544
December 348 446 543
Year 6,857 8,191 9,525

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 Santarém?

From November to February the system produces about 1,918 kWh, which is 24% of the year. The weakest month (November) gives roughly 425 kWh.

Is an east-west roof worth it in Santarém?

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 Santarém

Ground mount or roof in Santarém?

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 Santarém

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