Fox ESS CQ7-S 7.02 kWh HV Slave Battery

The Fox ESS CQ7-S is a slave module for the CQ7 high-voltage battery system. It uses lithium iron phosphate (LFP) cells and has a nominal capacity of 7.02 kWh. It has no system controller of its own, so it has to run under a CQ7-M master module in the same stack.

A CQ7 stack takes one master and up to 13 slaves connected in series, which gives up to 14 modules and 98.28 kWh per stack. The smallest working system is one master plus one slave, which gives 14.04 kWh. Depth of discharge is 90%, and round-trip efficiency is above 95% at 25°C and 0.3C.

Each module measures 660 x 360 x 190 mm, weighs about 50 kg and is rated IP65 for indoor or outdoor floor-standing installation. It cools by natural convection, communicates over CAN and has a built-in fire protection function.