How much will solar panels produce in Boise?

A 8 kWp system facing south at 35° tilt in Boise produces about 13,717 kWh a year. In a weak year that is 11,494 kWh, in a good one 15,941 kWh — 1,715 kWh per kWp.

That’s about 131% 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 755 kWh, range 583–927FebFebruary: 8 kWp 876 kWh, range 653–1,100MarMarch: 8 kWp 1,204 kWh, range 970–1,439AprApril: 8 kWp 1,324 kWh, range 1,080–1,569MayMay: 8 kWp 1,381 kWh, range 1,142–1,620JunJune: 8 kWp 1,415 kWh, range 1,175–1,656JulJuly: 8 kWp 1,524 kWh, range 1,274–1,773AugAugust: 8 kWp 1,473 kWh, range 1,227–1,719SepSeptember: 8 kWp 1,305 kWh, range 1,081–1,528OctOctober: 8 kWp 1,129 kWh, range 909–1,350NovNovember: 8 kWp 810 kWh, range 667–953DecDecember: 8 kWp 643 kWh, range 478–807

kWh per month

A typical day in July

The sunniest month in Boise. Output peaks around 11:00 solar time, at about 5.9 kWh in the best hour.

0:006:0012:0018:0023:00 5.9 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 583 755 927
February 653 876 1,100
March 970 1,204 1,439
April 1,080 1,324 1,569
May 1,142 1,381 1,620
June 1,175 1,415 1,656
July 1,274 1,524 1,773
August 1,227 1,473 1,719
September 1,081 1,305 1,528
October 909 1,129 1,350
November 667 810 953
December 478 643 807
Year 11,494 13,717 15,941

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 Boise?

From November to February the system produces about 3,084 kWh, which is 22% of the year. The weakest month (December) gives roughly 643 kWh.

Is an east-west roof worth it in Boise?

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 Boise

Ground mount or roof in Boise?

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 Boise

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