SMA Backup Select

SMA Backup Select (BU-SLCT-US-50) is an automatic transfer switching device that enables single-phase battery-backup operation in the SMA Home Energy Solution together with the Sunny Boy Smart Energy. In the event of a power outage, the hybrid inverter ensures that SMA Backup Select automatically switches to battery-backup operation and the hybrid inverter can supply the loads connected to the backup system with power from the battery and the PV modules connected to the hybrid inverter.

When using SMA Backup Select, SMA Backup Start must be mounted and a rapid shutdown initiator used. This can be an external rapid shutdown initiator or the DC load-break switch of the inverter, configured as a rapid shutdown initiator.