How much will solar panels produce in Napier?

A 5 kWp system facing north at 35° tilt in Napier produces about 7,623 kWh a year. In a weak year that is 6,334 kWh, in a good one 8,911 kWh — 1,525 kWh per kWp.

That’s about 109% 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 841 kWh, range 690–992FebFebruary: 5 kWp 711 kWh, range 560–862MarMarch: 5 kWp 667 kWh, range 528–806AprApril: 5 kWp 585 kWh, range 468–702MayMay: 5 kWp 519 kWh, range 423–615JunJune: 5 kWp 400 kWh, range 320–479JulJuly: 5 kWp 474 kWh, range 373–576AugAugust: 5 kWp 562 kWh, range 453–672SepSeptember: 5 kWp 632 kWh, range 513–750OctOctober: 5 kWp 765 kWh, range 619–910NovNovember: 5 kWp 731 kWh, range 576–886DecDecember: 5 kWp 783 kWh, range 643–923

kWh per month

A typical day in January

The sunniest month in Napier. 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 690 841 992
February 560 711 862
March 528 667 806
April 468 585 702
May 423 519 615
June 320 400 479
July 373 474 576
August 453 562 672
September 513 632 750
October 619 765 910
November 576 731 886
December 643 783 923
Year 6,334 7,623 8,911

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 Napier?

From May to August the system produces about 1,955 kWh, which is 25% of the year. The weakest month (June) gives roughly 400 kWh.

Is an east-west roof worth it in Napier?

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 Napier

Ground mount or roof in Napier?

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 Napier

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