How much will solar panels produce in New Plymouth?

A 5 kWp system facing north at 35° tilt in New Plymouth produces about 7,583 kWh a year. In a weak year that is 6,351 kWh, in a good one 8,814 kWh — 1,517 kWh per kWp.

That’s about 108% 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 830 kWh, range 664–997FebFebruary: 5 kWp 739 kWh, range 601–878MarMarch: 5 kWp 730 kWh, range 605–856AprApril: 5 kWp 575 kWh, range 464–687MayMay: 5 kWp 483 kWh, range 401–565JunJune: 5 kWp 396 kWh, range 313–479JulJuly: 5 kWp 453 kWh, range 368–539AugAugust: 5 kWp 558 kWh, range 452–664SepSeptember: 5 kWp 634 kWh, range 519–750OctOctober: 5 kWp 744 kWh, range 608–880NovNovember: 5 kWp 746 kWh, range 615–878DecDecember: 5 kWp 806 kWh, range 659–953

kWh per month

A typical day in January

The sunniest month in New Plymouth. Output peaks around 12:00 solar time, at about 3.3 kWh in the best hour.

0:006:0012:0018:0023:00 3.3 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 664 830 997
February 601 739 878
March 605 730 856
April 464 575 687
May 401 483 565
June 313 396 479
July 368 453 539
August 452 558 664
September 519 634 750
October 608 744 880
November 615 746 878
December 659 806 953
Year 6,351 7,583 8,814

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 New Plymouth?

From May to August the system produces about 1,891 kWh, which is 25% of the year. The weakest month (June) gives roughly 396 kWh.

Is an east-west roof worth it in New Plymouth?

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 New Plymouth

Ground mount or roof in New Plymouth?

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 New Plymouth

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