SMA SUNNY BOY STORAGE 3.8-US Instructions D'installation page 21

SMA Solar Technology AG
The secure power supply operation is not automatically enabled in the event of a grid failure,
neither is it automatically disabled once the utility grid is available again. If the utility grid fails, the
load supply must be enabled manually by activating the switch. The inverter automatically regulates
the energy supply of the outlet after activating the switch. When the utility grid is available again
and the load can be supplied by this again, the secure power supply operation must be disabled
manually by switching the switch off.
During active secure power supply operation, the inverter is disconnected from the building's main
electrical system and does not therefore feed into the utility grid. During secure power supply
operation, the load can only be supplied with energy as long as there is stored energy available in
the battery. If there is insufficient energy available from the battery, the secure power supply
operation remains active, even if the utility grid is available again. Switching over to supplying the
load from the utility grid is not carried out automatically.
No secure power supply operation possible in the SMA Energy System
Home with Battery-Backup Function
If the inverter is used in an SMA Energy System Home with battery-backup function and
connected with an automatic transfer switching device, the secure power supply operation is
not available.
Do not connect any loads that require an uninterrupted energy supply
The secure power supply operation and the battery-backup operation may not be used for
loads that require a uninterrupted energy supply. The energy that is available during the
secure power supply operation or battery-backup operation depends on the battery capacity
available and the state of charge of the battery (SOC).
• Do not connect loads if they are dependent on an uninterrupted energy supply for
reliable operation.
Battery-backup function
The inverter is equipped with a battery-backup function. The battery-backup function is disabled by
default and must be enabled via the user interface. The battery-backup function can only be
enabled if the inverter is operated in a battery-backup system with an automatic transfer switching
device. If the system is retrofitted with an automatic transfer switching device, the battery
configuration must be reset and carried out once again. Then the battery-backup system must be
configured. The configuration is carried out via the installation assistant on the user interface of the
battery inverter.
The battery-backup function ensures that the inverter forms a battery-backup grid that uses energy
from the battery and the PV system to supply the household grid in the event of a utility grid failure.
When the battery-backup operation is activated, the automatic transfer switch disconnects the PV
system and the household grid from the utility grid in the event of a grid failure, and connects these
to the battery-backup grid. After a short switch-over time, the battery-backup grid and loads
connected can be supplied by the battery and supplemented with energy from the PV system. The
charging of the battery is ensured by the existing PV system during battery-backup operation. The
charging process of the battery (initiated by the PV system) can be deactivated via a certain
parameter during battery-backup operation. As soon as the utility grid is available again, the
battery-backup operation is disabled automatically and the loads are supplied with energy from the
utility grid. If the automatic battery-backup operation is not set, the battery-backup operation must
Installation Manual
4 Product Overview
SBSxx-US-10-IA-xx-14 21