How much will solar panels produce in Invercargill?

A 5 kWp system facing north at 35° tilt in Invercargill produces about 6,413 kWh a year. In a weak year that is 5,360 kWh, in a good one 7,466 kWh — 1,283 kWh per kWp.

That’s about 92% 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 705 kWh, range 571–839FebFebruary: 5 kWp 656 kWh, range 537–775MarMarch: 5 kWp 566 kWh, range 454–678AprApril: 5 kWp 439 kWh, range 351–527MayMay: 5 kWp 339 kWh, range 277–400JunJune: 5 kWp 283 kWh, range 231–335JulJuly: 5 kWp 317 kWh, range 247–386AugAugust: 5 kWp 428 kWh, range 350–505SepSeptember: 5 kWp 557 kWh, range 463–651OctOctober: 5 kWp 661 kWh, range 538–785NovNovember: 5 kWp 735 kWh, range 606–864DecDecember: 5 kWp 750 kWh, range 623–877

kWh per month

A typical day in December

The sunniest month in Invercargill. Output peaks around 11:00 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 571 705 839
February 537 656 775
March 454 566 678
April 351 439 527
May 277 339 400
June 231 283 335
July 247 317 386
August 350 428 505
September 463 557 651
October 538 661 785
November 606 735 864
December 623 750 877
Year 5,360 6,413 7,466

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 Invercargill?

From May to August the system produces about 1,366 kWh, which is 21% of the year. The weakest month (June) gives roughly 283 kWh.

Is an east-west roof worth it in Invercargill?

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 Invercargill

Ground mount or roof in Invercargill?

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 Invercargill

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