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For households with solar already installed and evening electricity use above 8–10 kWh, yes — typically. With feed-in tariffs sitting at 2–5¢/kWh and grid power costing 28–35¢, the arbitrage value is around 25¢ per kWh stored. A 16 kWh battery cycling 300 days a year saves roughly $1,200 annually. Add a state rebate and payback can fall to 6–8 years against a 10-year warranty.

Depends on your priority. For pure value, the GoodWe ESA 16kWh at $5,300 is hard to beat. For compatibility with any inverter brand, the BYD HVM 16.6 is Australia's most-installed battery for a reason. For maximum backup output (11.5kW continuous), the Tesla Powerwall 3 leads the field. All three use LFP chemistry and carry 10-year warranties.

The Tesla Model 3 Long Range AWD (629km WLTP) and Hyundai Ioniq 6 Long Range AWD (614km WLTP) lead among mainstream EVs. In real Australian conditions — highway speeds, air conditioning — expect 15–20% less than WLTP. The Model 3 LR is also the more efficient car at freeway speeds.

The myenergi Zappi is the standout for solar households — it adjusts its charge rate in real time to match surplus solar generation, so your car charges on energy you'd otherwise export at 2–5¢. The Fronius Wattpilot 22J is another strong option if you have a Fronius inverter, with deeper integration into the Fronius Solar.web monitoring platform.

Victoria: up to $8,800 supply-only rebate under the Solar Homes Program (income-tested, under $210k). South Australia: subsidised interest-free loan via the Home Battery Scheme. ACT: interest-free loan up to $15,000 under the Sustainable Household Scheme. Queensland: $3,000 Battery Booster rebate for eligible households.