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Huawei's Backup Box provides automatic detection &switchover providing reliable backup power.‚
The Backup Box is used in a residential rooftop PV plant system to control the inverter grid-tied
or off-grid state.
When the grid fails, the inverter switches to the off-grid state and supplies power to off-grid loads in backup mode.
When the grid recovers, the inverter switches back to the grid-tied state.