Solar in NZ — frequently asked questions

EECA puts the current benchmark at around $2,000 per kW installed, so a typical home system runs roughly $8,500 for 3kW, $11,500 for 5kW, and about $14,000–$16,500 for a popular 6–7kW system. Adding a battery typically costs another $5,000–$15,000+. Prices vary by panel quality, roof complexity and location, so the best way to know is to compare a few quotes. (Indicative; source: EECA / Gen Less, Dec 2025.)

EECA and Consumer NZ both put the typical payback for residential solar in New Zealand at around 7–10 years, with savings of roughly $1,000–$1,500 a year on a 5kW system. The biggest driver is how much of your own generation you use during the day, because grid power costs far more than the rate you earn exporting surplus. (Indicative; source: EECA, 2025.)

Since 23 October 2025, roof-mounted solar generally does not need a building consent — arrays under 40m² per roof (in wind zones up to 'High') are exempt, and larger arrays are exempt if a chartered engineer signs off the fixings. The Building Code still applies, and resource consent under your District Plan can still apply for heritage or character properties, so check with your council. Your installer will advise. (Source: MBIE Building Performance, Oct 2025.)

North-facing roofs are ideal in New Zealand as they receive the most sun. East and west-facing roofs also work well — north-east or north-west orientations typically still generate a large share of optimal output. Your installer will model expected generation for your specific roof.

Surplus power is exported to the grid and your retailer pays a buyback (feed-in) rate for it. There is no national feed-in tariff, so rates vary by retailer — currently from around 11c/kWh up to about 23c/kWh on the best time-of-use plans. From 1 July 2026, large retailers must offer at least one time-varying buyback rate that rewards peak exports. Compare current rates on Powerswitch. (As at June 2026.)

Yes — panels still generate on cloudy days, though at reduced output. New Zealand averages about 4 kWh/m² of solar energy per day, and most of the country gets enough sun for solar to perform well year-round, even allowing for overcast weather.

No. There is no nationwide government subsidy, rebate or feed-in tariff for residential solar — the Government looked at an Australia-style subsidy in 2025 and decided against it. EECA's Warmer Kiwi Homes programme does not cover solar. Some banks offer low- or zero-interest green loans (for example Westpac's interest-free top-up), and from 1 April 2026 lines companies pay small peak-export rebates via your power bill. Check with your bank, council and lines company. (Source: RNZ / EECA, 2025–2026.)

Quality solar panels typically last 25–30+ years. Tier-1 brands now commonly offer 25-year product warranties and 25–30-year performance warranties guaranteeing a minimum output (often around 80–87% at year 25). Inverters generally carry 5–12-year warranties (commonly 10) and may need replacing once over the panels' life. Always check the manufacturer's datasheet.

Yes — most modern solar systems can have a battery added later. Some older inverters may need upgrading to a hybrid or AC-coupled setup. Note that EECA's view is that, on cost grounds alone, panels without a battery generally give the best return today, though a battery can be worth it for evening use or backup power. Your installer can assess compatibility.

In most NZ locations rain provides enough cleaning. If you're in a dusty area or near the coast (salt spray), occasional cleaning can help. Many installers offer maintenance packages.