This is a special order product. See our return policy for more information. Lead time applies.
SMA Backup Start (BU-STRT-US-50) is required in order to use secure power supply and battery-backup operation (e.g., SMA Backup Secure) in the SMA Energy System Home. SMA Backup Start is equipped with a battery that can be charged to start the system when energy is present in the PV system or the system battery.