Here are typical installed prices for popular solar batteries in Australia: * not including hybrid inverter cost – which can be shared with solar installation cost. These. What you pay for a home battery system is the sum of the: battery cost battery inverter cost (if required) installation cost finance cost (if applicable) And if you want. Battery Cost Factor #1 Battery Capacity The energy storage capacity of a battery is measured in kilowatt-hours (kWhs). The higher the capacity, the more kWhs it stores, and the more the solar battery costs. But there is an economy of scale – the more kWhs you buy, the cheaper the batteries become per kWh: *Istore & Sungrow includes. All home batteries need a compatible inverter to charge, discharge and play nice with the grid. The inverter can be built into the battery appliance (e.g. Powerwall, sonnen) or separate from it (e.g. Sungrow, Goodwe, Huawei). The inverter's capabilities directly affect the cost of the battery system in 3 ways: #1 Single or Three Phase? If you want. From my video: Installing a SolarEdge battery. Installation Cost Factor #1: Backup Most Australians expect backup with their solar battery system. Backup adds to the hardware and installation cost. The backup function is either built into the battery inverter or a separate 'backup box'. Some general rules around the cost of solar battery.