How much will solar panels produce in Porto?

A 5 kWp system facing south at 35° tilt in Porto produces about 7,616 kWh a year. In a weak year that is 6,376 kWh, in a good one 8,856 kWh — 1,523 kWh per kWp.

That’s about 254% of a typical home’s yearly use (3,000 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

02505007501,000JanJanuary: 5 kWp 456 kWh, range 335–578FebFebruary: 5 kWp 487 kWh, range 354–620MarMarch: 5 kWp 622 kWh, range 482–763AprApril: 5 kWp 684 kWh, range 540–827MayMay: 5 kWp 815 kWh, range 671–959JunJune: 5 kWp 771 kWh, range 642–900JulJuly: 5 kWp 845 kWh, range 693–996AugAugust: 5 kWp 832 kWh, range 692–971SepSeptember: 5 kWp 720 kWh, range 583–857OctOctober: 5 kWp 552 kWh, range 419–684NovNovember: 5 kWp 388 kWh, range 257–520DecDecember: 5 kWp 401 kWh, range 294–508

kWh per month

A typical day in July

The sunniest month in Porto. Output peaks around 11:00 solar time, at about 3.3 kWh in the best hour.

0:006:0012:0018:0023:00 3.3 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 335 456 578
February 354 487 620
March 482 622 763
April 540 684 827
May 671 815 959
June 642 771 900
July 693 845 996
August 692 832 971
September 583 720 857
October 419 552 684
November 257 388 520
December 294 401 508
Year 6,376 7,616 8,856

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 Porto?

From November to February the system produces about 1,732 kWh, which is 23% of the year. The weakest month (November) gives roughly 388 kWh.

Is an east-west roof worth it in Porto?

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 Porto

Ground mount or roof in Porto?

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 Porto

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