How much will solar panels produce in Honolulu?

A 8 kWp system facing south at 35° tilt in Honolulu produces about 14,529 kWh a year. In a weak year that is 12,186 kWh, in a good one 16,872 kWh — 1,816 kWh per kWp.

That’s about 138% 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 1,257 kWh, range 1,050–1,464FebFebruary: 8 kWp 1,165 kWh, range 920–1,410MarMarch: 8 kWp 1,271 kWh, range 1,040–1,502AprApril: 8 kWp 1,214 kWh, range 1,000–1,428MayMay: 8 kWp 1,141 kWh, range 953–1,328JunJune: 8 kWp 1,086 kWh, range 911–1,262JulJuly: 8 kWp 1,129 kWh, range 948–1,310AugAugust: 8 kWp 1,244 kWh, range 1,030–1,458SepSeptember: 8 kWp 1,299 kWh, range 1,084–1,513OctOctober: 8 kWp 1,324 kWh, range 1,103–1,545NovNovember: 8 kWp 1,249 kWh, range 1,040–1,458DecDecember: 8 kWp 1,173 kWh, range 945–1,401

kWh per month

A typical day in October

The sunniest month in Honolulu. Output peaks around 11:00 solar time, at about 5.1 kWh in the best hour.

0:006:0012:0018:0023:00 5.1 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 1,050 1,257 1,464
February 920 1,165 1,410
March 1,040 1,271 1,502
April 1,000 1,214 1,428
May 953 1,141 1,328
June 911 1,086 1,262
July 948 1,129 1,310
August 1,030 1,244 1,458
September 1,084 1,299 1,513
October 1,103 1,324 1,545
November 1,040 1,249 1,458
December 945 1,173 1,401
Year 12,186 14,529 16,872

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 Honolulu?

From November to February the system produces about 4,844 kWh, which is 33% of the year. The weakest month (June) gives roughly 1,086 kWh.

Is an east-west roof worth it in Honolulu?

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 Honolulu

Ground mount or roof in Honolulu?

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 Honolulu

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