How much will solar panels produce in Lisboa?

A 5 kWp system facing south at 35° tilt in Lisboa produces about 8,156 kWh a year. In a weak year that is 6,828 kWh, in a good one 9,485 kWh — 1,631 kWh per kWp.

That’s about 272% 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 506 kWh, range 396–617FebFebruary: 5 kWp 523 kWh, range 408–638MarMarch: 5 kWp 704 kWh, range 552–857AprApril: 5 kWp 692 kWh, range 544–839MayMay: 5 kWp 821 kWh, range 684–958JunJune: 5 kWp 810 kWh, range 675–944JulJuly: 5 kWp 880 kWh, range 733–1,026AugAugust: 5 kWp 896 kWh, range 751–1,041SepSeptember: 5 kWp 787 kWh, range 647–927OctOctober: 5 kWp 606 kWh, range 478–734NovNovember: 5 kWp 425 kWh, range 314–536DecDecember: 5 kWp 458 kWh, range 352–565

kWh per month

A typical day in August

The sunniest month in Lisboa. 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 396 506 617
February 408 523 638
March 552 704 857
April 544 692 839
May 684 821 958
June 675 810 944
July 733 880 1,026
August 751 896 1,041
September 647 787 927
October 478 606 734
November 314 425 536
December 352 458 565
Year 6,828 8,156 9,485

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 Lisboa?

From November to February the system produces about 1,913 kWh, which is 24% of the year. The weakest month (November) gives roughly 425 kWh.

Is an east-west roof worth it in Lisboa?

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 Lisboa

Ground mount or roof in Lisboa?

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 Lisboa

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