Is a Solar Battery Worth It? The Honest Answer for Australian Homeowners

What a battery actually does

A solar panel system generates electricity during the day. If you're home, you use some of it. The rest goes back to the grid at the feed-in tariff rate, which in most states is now between 3 and 8 cents per kilowatt-hour.

A battery stores that excess electricity instead of exporting it, so you can use it at night when your panels aren't producing. You're effectively replacing grid electricity that would cost you 28 to 42 cents per kilowatt-hour with stored solar that would have earned you 5 cents. That gap is where a battery makes its money.

When a battery makes financial sense

The case for battery storage is strongest when:

You use a lot of electricity in the evening. Families with children, homes with electric hot water systems set to heat at night, or households that run air conditioning after sunset all benefit more than those who are mostly out during the day.

You're in a state with high grid tariffs. South Australian households pay among the highest electricity rates in the country. The savings from not drawing grid power at peak rates are significantly higher there than in Queensland.

You're in a state with low feed-in tariffs. If you're in Western Australia, your feed-in rate is around 2.25 cents per kilowatt-hour. Every kilowatt-hour you export is worth almost nothing. A battery lets you use that energy rather than give it away.

You want energy security. This isn't a financial calculation, but it's a real one. Blackout protection has genuine value in areas prone to outages or for households with medical equipment.

When a battery probably isn't worth it yet

If you're mostly home during the day, your self-consumption rate is already high. Your solar is already powering your dishwasher, washing machine, and hot water system directly. A battery would store electricity you'd already be using.

If your feed-in tariff is generous, you may be better off exporting and taking the cash equivalent. Tasmania currently pays 8.8 cents per kilowatt-hour for exported solar. That's not a great return, but it's not nothing either.

If your budget is tight, the payback period on a battery is longer than on solar panels alone. A good quality 10kWh battery with installation currently runs $8,000 to $12,000 after the federal rebate. At typical savings rates, payback is 6 to 10 years. For the panels-only system, it's often 4 to 6 years.

What the federal battery rebate changes

The Cheaper Home Batteries Program, which started in 2025, has meaningfully improved the economics. It provides approximately $372 per kilowatt-hour of battery capacity for eligible installations. For a 10kWh battery, that's roughly $3,700 off the installed price.

That closes the gap considerably. A battery that would have cost $14,000 two years ago now costs closer to $10,000 in many cases.

The brands worth knowing about

At the budget end, Sungrow produces reliable systems and is widely supported by Australian installers. BYD is the most-installed battery brand in Australia, with a solid track record and good value at the mid tier. At the premium end, the Tesla Powerwall 3 offers the best integration with solar monitoring and has a strong warranty, but carries a price premium. Enphase microinverter systems paired with their IQ Battery are the most resilient in terms of shading and partial panel failure, but again come at a cost.

Sunlytics includes the battery brand, capacity, and warranty period in every quote that includes storage.