Emergency power supply module for Huawei M1 series three-phase inverters. The Backup Box B1 device is used in rooftop PV installation systems to control the grid-connected and off-grid operating state of the Huawei M1 series three-phase inverter.
In the event of a grid failure (power outage), the inverter switches to off-grid operation and supplies power to loads not connected to the power grid in backup power mode. Once the grid failure is cleared, the inverter switches back to the grid-connected state.
The Backup Box B1 device supports the following network systems: TN-S / TN-C-S / TT.
When installing the Backup Box B1 device outdoors, avoid direct exposure to sunlight. It is recommended to install it in a sheltered location or fit it with a protective cover.
A surge protection device (SPD) must be installed in the circuit of the Backup Box B1 on the power grid side.