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Battery guide

Solar batteries in New Zealand

Store the power your panels make during the day to use at night, cut your grid bill further, and keep the lights on during outages. A home battery typically adds $5,000–$15,000+ (about $1,250 per kWh). Here's how they work and whether one is worth it.

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How a home battery works

Solar panels generate most of their power in the middle of the day, when many households use the least. A battery captures that surplus instead of exporting it cheaply to the grid, then releases it in the evening when power is most expensive and demand is highest. Some systems also provide backup power during outages.

Is a battery worth it right now?

EECA's current view is that, on cost grounds alone, solar without a battery generally gives the best return today, and Consumer NZ notes a battery usually lengthens the payback period. A battery makes more sense if you value backup power during outages, can't shift much of your usage into daylight hours, or have a low export buyback rate. Battery costs are falling and time-of-use buyback plans (from July 2026) may improve the case over time.

Battery brands NZ installers fit

BYD Battery-Box

Modular design, LFP chemistry (safer/longer life), scalable, excellent value.

10-year warranty · China

Tesla Powerwall

All-in-one design, sleek aesthetics, strong brand, integrated backup.

10-year warranty · USA

Enphase Energy

Modular microinverter system, excellent monitoring, long warranty.

15-year warranty · USA

Alpha ESS

Good value, hybrid compatibility, expanding NZ support network.

10-year warranty · China

Pylontech

Modular LFP batteries, compatible with many inverters, cost-effective.

10-year warranty · China

Frequently asked questions

Do I need a battery with solar?+
No — many NZ homes start with panels only and add a battery later. Panels alone reduce your daytime grid use and export surplus power. A battery stores daytime generation for use in the evening peak, increases self-consumption, and can provide backup during outages if configured for it.
How much does a home solar battery cost?+
EECA puts the typical cost at around $5,000–$15,000+ added to a solar installation — roughly $5,000 for 5kWh, $10,000 for 10kWh and $20,000 for 20kWh, or about $1,250 per kWh installed. Larger capacity and backup capability cost more. Your installer can size a battery to your evening usage.
Is a solar battery worth it in NZ?+
On cost grounds alone, generally not yet — EECA's view is that solar without a battery usually gives the best financial return today, and Consumer NZ notes a battery usually lengthens the payback period. A battery can still be worth it if you want backup power during outages, can't shift much usage to daytime, or have a low buyback rate. Compare options carefully.

Sources

Figures on this page are indicative guidance, not a quote. Verified as at June 2026 — always confirm current pricing and rates with your installer or retailer.

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