BMS MG Master LV 12V 400A - MGMLV120400

738,10 VAT inc.

  • Compact design
  • Internal event log
  • Parameter monitoring: Cell voltage, temperature, balance, etc.
  • Battery status and charge monitoring.
  • Plug and Play: Automatic configuration
  • Integrated fuse holders
  • Safety contactors for direct current: Up to 400 A
  • Connectivity: RJ45



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Product information

BMS MG Master LV 12V 400A

Master LV Series

Protecting, monitoring and controlling batteries is very important to create safe, simple and reliable storage systems. The MG Master LV 12V400A BMS is the safety and control unit for any low voltage MG battery system in the 12V to 96V range.

It protects the connected modules against abnormal variations in charge and temperature and checks that the balance between the battery cells is correct.

In addition to its safety function, the Master LV monitors and controls other important parameters so that the user knows the battery status and power consumption at all times. The integrated DC power distributor, fuse holders and safety contactors facilitate installation and require less wiring and external equipment.


  • Compact design
  • Internal event log
  • Supervision of all battery parameters: cell voltage, temperature, balance, etc.
  • Battery status and charge monitoring.
  • Plug and Play: Automatic configuration
  • Fuse holder
  • Positive pole safety contactors
  • Integrated preload circuit
  • CAN-Bus communication
  • Connectivity: RJ45
  • Parallel connection: Up to 48 batteries
  • Serial connection: Up to 2 systems

Integrated AC power distributor

One of the unique features of the BMS of MG Energy SystemsThe main advantage of this system, which greatly facilitates the installation process, is its integrated AC power distribution system with fuse holder.

It is possible to configure flexible systems adapted to the needs of each case, whether they are small storage systems or large battery banks, since the BMS allows the connection of up to 96 battery modules.


The connections to communicate the batteries and the MG Master LV unit can be established with the more economical RJ45 cables or with the more robust and secure M12 cables. Both options can be used in low voltage battery banks up to 96V. In high voltage ranges above 96V, only M12 cables can be used.

The M12 connectors integrate a safety lock to monitor the connections. This safety lock can be used to switch the wired internal safety contactor by means of an external emergency button.

Diagnostic tools

Battery system diagnostics are important throughout the life of the battery system, from start-up, system testing, service and maintenance to troubleshooting. The diagnostic tools provide all the detailed information about the status of the battery system. Key values such as voltage, current and state of charge can be viewed and recorded in an internal log.

In addition, detailed battery information can be displayed, such as cell voltage, cell temperature through each of the sensors, installed firmware version, etc. Along with this information, historical and other stored events can also be accessed from the MG Master LV 12V 400A BMS.

To add more flexibility to the system, all settings can be configured as required.

Supervision and control

The Master LV can monitor all critical system parameters, such as cell voltage or the temperature of each connected battery. It offers a series of protections thanks to a set of limits configured for each of the parameters it measures. The first protection is a system that monitors the loads and chargers.

Second, a warning signal is triggered if any of the parameters are above normal. Finally, if the problem is not resolved, a critical fault system opens the safety contactors to interrupt the power flow between the batteries and the chargers. A well-integrated system never opens its safety contactors during normal operation.

The philosophy of the MG system is to have a master BMS (MG Master LV) that communicates with the BMS integrated in each of the MG batteries. The slave BMSs of these batteries are able to monitor parameters such as voltage, temperature or the balance of each cell.

All these parameters are sent to the MG Master LV through an isolated CAN-Bus that collects all the data and monitors the parameters according to the set limits. When a parameter exceeds that limit, the user will be notified via the AUX. CAN-Bus.

If this situation is maintained and the parameter does not return to normal, the MG Master LV has the possibility to disconnect the batteries from the system by opening its main contactors.


Additional information

Weight5 kg
Dimensions45 × 25 × 15 cm

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