https://www.gerchamp.com/products/g-bs-for-ess-bms/ bmu vs bms bms ems battery Gerchamp G-BS for ESS G-BS for ESS BMS consists of battery pack management unit (BMU module), battery cluster management unit (RCU module), system management unit (SCU module) and system display management unit (MM10 module). This lithium battery management system supports a maximum of 1500V energy storage system.All Rights Reserved