How much will solar panels produce in Blenheim?

A 5 kWp system facing north at 35° tilt in Blenheim produces about 7,753 kWh a year. In a weak year that is 6,472 kWh, in a good one 9,034 kWh — 1,551 kWh per kWp.

That’s about 111% of a typical home’s yearly use (7,000 kWh).

Calculate for my roof

Based on 2014–2023 satellite weather data

Production by month

05001,0001,500JanJanuary: 5 kWp 844 kWh, range 681–1,008FebFebruary: 5 kWp 777 kWh, range 612–941MarMarch: 5 kWp 725 kWh, range 600–851AprApril: 5 kWp 601 kWh, range 459–742MayMay: 5 kWp 507 kWh, range 410–604JunJune: 5 kWp 387 kWh, range 311–462JulJuly: 5 kWp 457 kWh, range 356–558AugAugust: 5 kWp 540 kWh, range 435–644SepSeptember: 5 kWp 640 kWh, range 524–757OctOctober: 5 kWp 775 kWh, range 642–907NovNovember: 5 kWp 787 kWh, range 642–932DecDecember: 5 kWp 774 kWh, range 631–917

kWh per month

A typical day in January

The sunniest month in Blenheim. 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 681 844 1,008
February 612 777 941
March 600 725 851
April 459 601 742
May 410 507 604
June 311 387 462
July 356 457 558
August 435 540 644
September 524 640 757
October 642 775 907
November 642 787 932
December 631 774 917
Year 6,472 7,753 9,034

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 Blenheim?

From May to August the system produces about 1,890 kWh, which is 24% of the year. The weakest month (June) gives roughly 387 kWh.

Is an east-west roof worth it in Blenheim?

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 Blenheim

Ground mount or roof in Blenheim?

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 Blenheim

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