A solar battery may help use more of your own solar power, but whether it is financially worthwhile in 2026 depends on your electricity use, feed-in tariff, battery size, installation costs and local rules. Rebates or discounts may be available through federal or state programs, but eligibility and the value of any support can depend on the system, installer and your circumstances. Compare usable capacity, warranty, expected lifespan, backup capability and compatibility with your existing inverter. Check current information on energy.gov.au and with a licensed battery installer before deciding.