MG Master HV BMS 48-900V 300A

The MG Master HV is the safety and control unit for high voltage lithium battery systems, suitable across a wide 48 Vdc to 900 Vdc range with a 300 A continuous rating. Each battery string is managed by its own Master HV, and strings are paralleled to scale both voltage and capacity, so system designers gain real flexibility for electric and hybrid marine propulsion. Unlike the low voltage Master LV, it carries two safety contactors, one in the positive and one in the negative power path, plus an integrated High Voltage Interlock Loop (HVIL) that opens the contactors in hardware, independently of the software. Amphenol PowerLok power connectors with integrated HVIL and low contact resistance carry up to 300 A continuously, while the built-in pre-charge circuit brings load and battery voltages together safely before the contactors close. The Master HV constantly monitors all battery parameters, tracks State of Charge and State of Health, and logs daily reports and fail-safe events to internal memory for retrieval with the MG Diagnostic Tool or the Energy Portal. CAN-Bus communication (NMEA2000 and J1939 compatible) links it to a vessel EMS or PMS, and an IP65 rated enclosure with DNV-GL, Lloyd's and ES-TRIN type approval suits demanding marine installations.