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

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.

Battery Disconnect Unit

Features:

• 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.

Features:

• Compatible with 12V or 24V systems
• 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)

Master Control Unit

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