The PK Accessory (Slave) is a supporting battery management unit designed to work in conjunction with the Power Keeper Accessory (Master) within Sungrow ST series battery systems. Acting as a passive extension of the master controller, it enables coordinated management of additional battery modules in larger or expandable energy storage configurations.

The PK Accessory (Slave) assists with communication and system balancing across the battery stack, ensuring stable and efficient operation. It is a required component in multi-module systems, allowing seamless scalability while maintaining overall system performance and protection.

Key Features

• Slave BMU unit – operates under control of the PK Accessory (Master)
• Supports scalable battery systems – enables expansion of ST series battery stacks
• Coordinated system management – assists with module communication and balancing
• Passive operation design – relies on master unit for control and optimization
• Ensures stable system performance across larger battery configurations
• Seamless integration with Sungrow ST series battery systems
• Required for multi-module installations where additional control capacity is needed

Technical Specifications