A solar battery can help homeowners use more of their rooftop solar at night, reduce reliance on grid electricity and provide limited backup during some outages. Whether it is worthwhile depends on your electricity usage, tariff, solar system, battery size, export payments, installation costs and how long you expect to stay in the property. Compare the likely savings with the battery’s upfront price, warranty and ongoing maintenance, rather than assuming payback is guaranteed. Ask an accredited installer for a tailored assessment and check current incentives through your state government or energy.gov.au.