Fox ESS S22 Master 2.1 kWh Plug & Play Battery

The Fox ESS S22 is a compact all-in-one storage system with an integrated inverter and LiFePO₄ battery, rated at 800 W continuous output with a 1.2 kVA peak, and 2.11 kWh nominal energy with 90% usable depth of discharge. The source lists model variants S22-M-H, S22-M-AC and S22-S, with cycle life stated as more than 6,000 cycles at 90% depth of discharge.

The unit is floor-mounted and rated IP65 for indoor or outdoor installation, with an operating temperature range of -20°C to 55°C. Optional battery warming, optional EPS backup for key loads and optional smart meter support are listed. Each unit can be stacked with up to four batteries for a total of 8.44 kWh.

Monitoring is provided through FoxCloud 2.0 and a mobile app, with Wi-Fi, Bluetooth, LAN and RS485 interfaces and an OLED display on the unit.