A solar battery can help store excess daytime solar for evening use, reducing reliance on grid electricity and potentially improving self-consumption. Whether it is financially worthwhile depends on your electricity tariff, household usage, system size, battery cost, expected lifespan and how much solar you would otherwise export. A battery may also provide backup power, but not every system can do this and extra equipment may be needed. Compare quotes from qualified installers, check current state or federal support through energy.gov.au, and consider an independent calculation before deciding.