SMA SUNNY BOY STORAGE 3.8-US Instrucciones De Instalación página 18

4 Product Overview
Secure power supply operation
In case of a grid failure, the secure power supply operation supplies the loads with energy from the
battery. You can connect a standard outlet and a standard switch to the inverter. You can connect
a load with a maximum of 16 A and 120 V to the outlet. The load is supplied with energy form the
battery during grid failure. The switch is used to activate and deactivate secure power supply
operation.
The secure power supply operation is not automatically activated in the event of a grid failure,
neither is it automatically deactivated once the utility grid is available again. If the utility grid fails,
the load supply must be activated 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 deactivated manually by switching the switch off.
During active secure power supply operation, the inverter is disconnected from the electricity 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
does not take place automatically. Once the battery is sufficiently charged again and the load can
be supplied, the secure power supply operation must be restarted.
Secure power supply operation in Flexible Storage Systems with backup
power supply not possible
If the inverter is used in a battery-backup system and connected with an automatic transfer
switch, the secure power supply operation is not available.
Do not connect any loads that require a stable energy supply
The secure power supply operation and the battery-backup operation may not be used for
loads that require a stable 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 a stable energy supply for reliable
operation.
Battery-backup function
The inverter is equipped with a battery-backup function. The battery-backup function is deactivated
by default and must be activated via the user interface. The battery-backup function can only be
activated if the inverter is operated in a battery-backup system with an automatic transfer switch. If
the system is retrofitted with an automatic transfer switch, 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
18 SBSxx-US-10-IA-xx-12
SMA Solar Technology AG
Installation Manual