How much will solar panels produce in London?

A 4 kWp system facing south at 35° tilt in London produces about 4,174 kWh a year. In a weak year that is 3,475 kWh, in a good one 4,873 kWh — 1,043 kWh per kWp.

That’s about 155% of a typical home’s yearly use (2,700 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 4 kWp 162 kWh, range 129–195FebFebruary: 4 kWp 220 kWh, range 175–264MarMarch: 4 kWp 346 kWh, range 254–438AprApril: 4 kWp 452 kWh, range 363–541MayMay: 4 kWp 503 kWh, range 395–610JunJune: 4 kWp 526 kWh, range 417–636JulJuly: 4 kWp 498 kWh, range 401–595AugAugust: 4 kWp 480 kWh, range 380–579SepSeptember: 4 kWp 394 kWh, range 313–474OctOctober: 4 kWp 269 kWh, range 206–333NovNovember: 4 kWp 182 kWh, range 143–221DecDecember: 4 kWp 127 kWh, range 81–173

kWh per month

A typical day in June

The sunniest month in London. Output peaks around 11:00 solar time, at about 2.1 kWh in the best hour.

0:006:0012:0018:0023:00 2.1 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 129 162 195
February 175 220 264
March 254 346 438
April 363 452 541
May 395 503 610
June 417 526 636
July 401 498 595
August 380 480 579
September 313 394 474
October 206 269 333
November 143 182 221
December 81 127 173
Year 3,475 4,174 4,873

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 London?

From November to February the system produces about 690 kWh, which is 17% of the year. The weakest month (December) gives roughly 127 kWh.

Is an east-west roof worth it in London?

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 London

Ground mount or roof in London?

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 London

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

All cities in United Kingdom

Climate data: Photovoltaic Geographical Information System (PVGIS) — European Commission, Joint Research Centre