How much will solar panels produce in Whanganui?
A 5 kWp system facing north at 35° tilt in Whanganui produces about 7,200 kWh a year. In a weak year that is 6,019 kWh, in a good one 8,381 kWh — 1,440 kWh per kWp.
That’s about 103% of a typical home’s yearly use (7,000 kWh).
Based on 2014–2023 satellite weather data
Production by month
kWh per month
A typical day in January
The sunniest month in Whanganui. Output peaks around 12:00 solar time, at about 3.1 kWh in the best hour.
Month by month
| Month | Weak year, kWh | Typical year, kWh | Good year, kWh |
|---|---|---|---|
| January | 644 | 804 | 964 |
| February | 572 | 707 | 842 |
| March | 555 | 673 | 792 |
| April | 440 | 555 | 671 |
| May | 375 | 458 | 540 |
| June | 293 | 368 | 443 |
| July | 338 | 421 | 503 |
| August | 420 | 513 | 605 |
| September | 481 | 587 | 693 |
| October | 581 | 702 | 823 |
| November | 574 | 711 | 847 |
| December | 611 | 750 | 889 |
| Year | 6,019 | 7,200 | 8,381 |
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 Whanganui?
From May to August the system produces about 1,759 kWh, which is 24% of the year. The weakest month (June) gives roughly 368 kWh.
Is an east-west roof worth it in Whanganui?
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.
Ground mount or roof in Whanganui?
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.
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 roofClimate data: Photovoltaic Geographical Information System (PVGIS) — European Commission, Joint Research Centre