The Fox ESS AC3 8kW is a three-phase AC-coupled battery inverter, designed to retrofit battery storage onto an existing grid-tied solar system without touching the original PV inverter or its wiring.

• 8kW rated output, three-phase

• AC-coupled - works alongside an existing PV inverter

• Compatible with 180-600V lithium (LFP) battery systems

• IP65-rated for indoor or outdoor mounting

Because it measures the existing PV inverter's output rather than PV strings directly, it requires a separate meter (such as the Fox ESS CHINT meter) to manage export limitation correctly.

It's a straightforward way to add battery storage to a property that already has solar without replacing the existing inverter.