Solar battery storage captures excess electricity from your panels during the day so you can use more of your own solar after sunset. Whether it is worthwhile depends on your energy use, electricity tariff, export payments, battery cost, expected lifespan and how much you value backup power. A grid-connected battery may not keep your home running during an outage unless it has suitable backup equipment and circuits. Ask a licensed installer for a personalised assessment, compare warranties and quotes, and check current government guidance at energy.gov.au.