A useful solar battery guide should explain usable capacity, power output, efficiency, warranty terms and how the battery will work with your existing solar system. Compare your household’s evening electricity use, future energy needs and available space rather than choosing only by storage size. Ask Clean Energy Council-accredited installers about installation, safety, backup capability and whether your inverter needs upgrading. Rebates and electricity savings depend on your location, system and circumstances, so check current details with the relevant state government, energy.gov.au and your electricity retailer.