How much will solar panels produce in Nantes?

A 6 kWp system facing south at 35° tilt in Nantes produces about 7,512 kWh a year. In a weak year that is 6,302 kWh, in a good one 8,722 kWh — 1,252 kWh per kWp.

That’s about 160% of a typical home’s yearly use (4,700 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 6 kWp 295 kWh, range 223–368FebFebruary: 6 kWp 440 kWh, range 354–526MarMarch: 6 kWp 637 kWh, range 500–773AprApril: 6 kWp 769 kWh, range 604–934MayMay: 6 kWp 850 kWh, range 688–1,012JunJune: 6 kWp 853 kWh, range 677–1,028JulJuly: 6 kWp 859 kWh, range 693–1,025AugAugust: 6 kWp 847 kWh, range 701–993SepSeptember: 6 kWp 729 kWh, range 578–880OctOctober: 6 kWp 543 kWh, range 431–656NovNovember: 6 kWp 393 kWh, range 307–480DecDecember: 6 kWp 251 kWh, range 192–311

kWh per month

A typical day in July

The sunniest month in Nantes. 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 223 295 368
February 354 440 526
March 500 637 773
April 604 769 934
May 688 850 1,012
June 677 853 1,028
July 693 859 1,025
August 701 847 993
September 578 729 880
October 431 543 656
November 307 393 480
December 192 251 311
Year 6,302 7,512 8,722

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 Nantes?

From November to February the system produces about 1,380 kWh, which is 18% of the year. The weakest month (December) gives roughly 251 kWh.

Is an east-west roof worth it in Nantes?

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 Nantes

Ground mount or roof in Nantes?

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 Nantes

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