4 Product Overview
SMA Solar Technology AG
Operating Manual
STPx0-3SE-40-BE-en-10
22
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 configuration is set on the user interface of
the inverter.
The battery-backup function ensures that the inverter forms a three-phase battery-backup grid that
uses energy from the battery and the PV system that is directly connected to the inverter to supply
the circuits of the household grid in the event of a utility grid failure. If automatic battery-backup
operation is activated, the selected backup loads connected to the
AC-BACKUP
terminal are
connected and supplied to the
AC-GRID
terminal in parallel grid operation mode via an integrated
bypass contactor. In the event of a grid failure, the contactor opens. The inverter provides a stand-
alone grid and the backup loads continue to be supplied by the energy stored in the battery and
the PV modules connected directly to the inverter.
The charging of the battery is ensured by the existing PV system 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 household grid.
When the utility grid is down and the battery fully discharged, there is, in the beginning, not enough
power available to create a stable battery-backup grid. In this case, the battery must be charged by
the PV system. The inverter is able to create a stable battery-backup grid only when enough power
is available in the battery. Battery-backup operation starts automatically as soon as enough energy
is available from the PV system. By setting parameters, it is possible to define up to which state of
charge the battery is charged and discharged. For example, it is possible to set the amount of
energy that should remain in the battery for battery-backup operation.
Communication between the inverter and the SMA apps takes place via a direct Wi-Fi connection
in battery-backup operation.
Do not connect any loads that require an uninterrupted energy supply
The battery-backup operation may not be used for loads that require a uninterrupted energy
supply. The energy that is available during the 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.
Multifunction Relay
The inverter is equipped with a multifunction relay as standard. The multifunction relay is an
interface that can be configured for the operating mode used by a particular system.
SMA ShadeFix
The inverter is equipped with the shade management system SMA ShadeFix. SMA ShadeFix uses
an intelligent MPP tracking system to determine the operating point with the highest output during
shading conditions. With SMA ShadeFix, inverters use the best possible energy supply from the PV
modules at all times to increase yields in shaded systems. SMA ShadeFix is enabled by default. The
time interval of SMA ShadeFix is usually six minutes. This means that the inverter determines the
optimum operating point every six minutes. Depending on the PV system or shading situation, it may
be useful to adjust the time interval.
Summary of Contents for SUNNY TRIPOWER 10.0 SMART ENERGY
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