How much will solar panels produce in Roma?

A 6 kWp system facing south at 35° tilt in Roma produces about 9,073 kWh a year. In a weak year that is 7,571 kWh, in a good one 10,575 kWh — 1,512 kWh per kWp.

That’s about 336% of a typical home’s yearly use (2,700 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 6 kWp 523 kWh, range 400–647FebFebruary: 6 kWp 595 kWh, range 469–720MarMarch: 6 kWp 799 kWh, range 653–945AprApril: 6 kWp 866 kWh, range 717–1,015MayMay: 6 kWp 942 kWh, range 749–1,134JunJune: 6 kWp 952 kWh, range 790–1,114JulJuly: 6 kWp 1,056 kWh, range 879–1,233AugAugust: 6 kWp 1,008 kWh, range 840–1,176SepSeptember: 6 kWp 840 kWh, range 703–978OctOctober: 6 kWp 697 kWh, range 545–849NovNovember: 6 kWp 493 kWh, range 374–611DecDecember: 6 kWp 454 kWh, range 347–562

kWh per month

A typical day in July

The sunniest month in Roma. Output peaks around 11:00 solar time, at about 4.1 kWh in the best hour.

0:006:0012:0018:0023:00 4.1 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 400 523 647
February 469 595 720
March 653 799 945
April 717 866 1,015
May 749 942 1,134
June 790 952 1,114
July 879 1,056 1,233
August 840 1,008 1,176
September 703 840 978
October 545 697 849
November 374 493 611
December 347 454 562
Year 7,571 9,073 10,575

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 Roma?

From November to February the system produces about 2,065 kWh, which is 22% of the year. The weakest month (December) gives roughly 454 kWh.

Is an east-west roof worth it in Roma?

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 Roma

Ground mount or roof in Roma?

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 Roma

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