How much will solar panels produce in Whangārei?

A 5 kWp system facing north at 35° tilt in Whangārei produces about 7,337 kWh a year. In a weak year that is 6,133 kWh, in a good one 8,541 kWh — 1,467 kWh per kWp.

That’s about 105% of a typical home’s yearly use (7,000 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

02505007501,000JanJanuary: 5 kWp 791 kWh, range 635–947FebFebruary: 5 kWp 648 kWh, range 527–768MarMarch: 5 kWp 692 kWh, range 570–814AprApril: 5 kWp 586 kWh, range 484–688MayMay: 5 kWp 504 kWh, range 408–599JunJune: 5 kWp 415 kWh, range 339–492JulJuly: 5 kWp 467 kWh, range 389–545AugAugust: 5 kWp 543 kWh, range 451–635SepSeptember: 5 kWp 614 kWh, range 507–721OctOctober: 5 kWp 681 kWh, range 562–801NovNovember: 5 kWp 701 kWh, range 574–829DecDecember: 5 kWp 735 kWh, range 597–873

kWh per month

A typical day in January

The sunniest month in Whangārei. Output peaks around 12:00 solar time, at about 3.1 kWh in the best hour.

0:006:0012:0018:0023:00 3.1 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 635 791 947
February 527 648 768
March 570 692 814
April 484 586 688
May 408 504 599
June 339 415 492
July 389 467 545
August 451 543 635
September 507 614 721
October 562 681 801
November 574 701 829
December 597 735 873
Year 6,133 7,337 8,541

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 Whangārei?

From May to August the system produces about 1,928 kWh, which is 26% of the year. The weakest month (June) gives roughly 415 kWh.

Is an east-west roof worth it in Whangārei?

An east-west system typically produces 10–25% less per kWp than one facing north, but spreads production more evenly through the day. The exact difference depends on tilt and shading.

Compare an east-west roof for Whangārei

Ground mount or roof in Whangārei?

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 Whangārei

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