Not necessarily. Whether a battery is worth adding to your solar system depends on when you use power, whether backup during an outage matters to you, and your budget, not a rule that applies to everyone. Here’s how to think it through properly.
Solar panels generate power during the day. If you’re home and using appliances, heating or charging an EV while the sun’s out, you’re likely already using much of that power directly. If you’re out at work during the day and home in the evening, you may be exporting most of your solar generation back to the grid for a small credit, exactly the gap a battery is designed to close.
You’re away from home during the day and want to use your stored solar power in the evening instead
Backup during power outages matters to you, a battery can keep essential circuits running when the grid goes down
You want more energy independence, reducing how much you rely on the grid generally
You’re on a remote or less reliable grid connection, where outages or supply issues are more common
You’re home during the day and already using most of your solar generation as it’s produced
Budget is a genuine constraint, and you’d rather start with solar alone and add a battery later once it fits
You’re not concerned about outages and are comfortable exporting excess power to the grid
There’s no shame in choosing solar without a battery for now. Systems can often be designed to add one later without needing to start over.
Right now, only around 0.7% of New Zealand homes with solar also have a battery. That’s a small number, but it’s already more than quadrupled from 0.15% just two years ago. In other words, this is still early-adopter territory in New Zealand, not yet mainstream, but clearly gaining momentum.
Across the Tasman, Australia sold 183,245 home batteries in just the second half of 2025, more than the previous four years combined, roughly 1,000 batteries a day. That surge followed a government rebate scheme. With the Greens having proposed battery support as part of this year’s New Zealand election conversation, it’s worth considering that a similar shift in demand could happen here if a comparable scheme were introduced, which is one more reason to understand your options before any rush begins.
The honest way to know whether a battery is worth it for your specific home is to look at your actual daily usage pattern, not a generic rule of thumb. A proper assessment factors in when you use power, your goals for backup or independence, and your budget, so the recommendation is based on your household, not an industry average.
Read our Solar Finance and Election Update for a continuously updated breakdown of what’s confirmed versus proposed, plus current bank loan options.
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