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Battery Controls

Battery Disconnect Unit/String Control Unit (BDU/SCU)

The BDU manages individual strings of series-connected XMP subpacks through its on-board String Controller Unit (SCU), pre-charge circuit, current sensor, and contactors. For large XPAND systems of multiple parallel-connected strings, BDUs are connected in parallel.

  • Compatible with 12V or 24V systems
  • Isolated high voltage measurements up to 1250 VDC
  • Current sensing capability -500A to +500A standard; up to ± 1200A optional
  • Redundant dual contactor controls ensure safe operation
  • Self-addressing provides simple installation and service
  • IP69 compliant (with connectors mated)

Master Control Unit (MCU)

The MCU manages multiple parallel strings (up to 24) while providing a single and simple interface to the application controller.


  • Compatible with 12V or 24V systems

    XALT Master Control Unit (MCU)

  • Autonomously controls balancing of battery strings
  • Provides autonomous addressing to individual battery strings, supporting a true modular architecture
  • HV Interlock Loop (HVIL) monitoring of each battery string
  • Provides collective system and diagnostic information to the application
  • IP69 compliant (with connectors mated)