How much will solar panels produce in Phoenix?

A 8 kWp system facing south at 35° tilt in Phoenix produces about 15,190 kWh a year. In a weak year that is 12,732 kWh, in a good one 17,649 kWh — 1,899 kWh per kWp.

That’s about 145% of a typical home’s yearly use (10,500 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,5002,000JanJanuary: 8 kWp 1,127 kWh, range 916–1,338FebFebruary: 8 kWp 1,167 kWh, range 939–1,395MarMarch: 8 kWp 1,411 kWh, range 1,162–1,661AprApril: 8 kWp 1,449 kWh, range 1,212–1,686MayMay: 8 kWp 1,439 kWh, range 1,204–1,674JunJune: 8 kWp 1,313 kWh, range 1,096–1,530JulJuly: 8 kWp 1,241 kWh, range 1,035–1,448AugAugust: 8 kWp 1,275 kWh, range 1,068–1,482SepSeptember: 8 kWp 1,261 kWh, range 1,043–1,478OctOctober: 8 kWp 1,355 kWh, range 1,104–1,605NovNovember: 8 kWp 1,170 kWh, range 975–1,365DecDecember: 8 kWp 1,004 kWh, range 825–1,184

kWh per month

A typical day in April

The sunniest month in Phoenix. Output peaks around 12:00 solar time, at about 5.7 kWh in the best hour.

0:006:0012:0018:0023:00 5.7 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 916 1,127 1,338
February 939 1,167 1,395
March 1,162 1,411 1,661
April 1,212 1,449 1,686
May 1,204 1,439 1,674
June 1,096 1,313 1,530
July 1,035 1,241 1,448
August 1,068 1,275 1,482
September 1,043 1,261 1,478
October 1,104 1,355 1,605
November 975 1,170 1,365
December 825 1,004 1,184
Year 12,732 15,190 17,649

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 Phoenix?

From November to February the system produces about 4,469 kWh, which is 29% of the year. The weakest month (December) gives roughly 1,004 kWh.

Is an east-west roof worth it in Phoenix?

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 Phoenix

Ground mount or roof in Phoenix?

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 Phoenix

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