The FoxESS CQ6-M HV Master Battery Unit 5.99kWh is the essential master unit for FoxESS high-voltage battery systems, featuring a built-in power control unit. Designed to sit at the top of a battery stack, it manages and controls connected CQ6 battery modules, ensuring efficient performance and system stability. With a 5.99kWh capacity and scalable design, it is ideal for residential and commercial solar energy storage solutions.