A solar battery stores surplus electricity from your panels so you can use more solar after dark, reducing reliance on grid power. Key considerations include usable capacity, power output, battery chemistry, warranty terms, installation location and whether the system can provide backup during a blackout. A qualified installer can assess your household’s energy use, solar generation and switchboard before recommending a suitable size. Costs, feed-in tariffs and any available incentives vary, so check current details with your installer, energy retailer and the Australian Government’s energy.gov.au website.