Backup Box B1 for 3ph System

#1: HUA-BACKUP-BOX-B1

Backup Box Data Sheet

Backup Box Manual

Backup Box Warranty

Huawei Backup Box B1 – Three-Phase Systems

Part No: HUA-BACKUP-BOX-B1
Category: Energy Storage System Accessory

The Huawei Backup Box B1 enables automatic detection and seamless switchover between grid-connected and backup operation, providing reliable backup power for three-phase residential PV and battery storage systems.

Designed to work alongside compatible Huawei hybrid inverters, the Backup Box intelligently manages the system’s operating state to ensure continuity of supply during grid outages.

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How It Works

• Normal operation: The inverter operates in a grid-tied state

• Grid outage detected: The Backup Box automatically signals the inverter to switch to off-grid (backup) mode, supplying power to designated backup loads

• Grid restoration: The system automatically transitions back to grid-tied operation once supply is restored

This automated process ensures uninterrupted power to critical loads without manual intervention.

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Key Benefits

• Automatic grid failure detection and recovery

• Seamless transition between grid-tied and off-grid operation

• Reliable backup power for selected circuits

• Designed specifically for three-phase residential systems

• Fully integrated with Huawei inverter architecture