Connecting External Sources SMA Solar Technology AG
126 SI5048-TB-TEN110340 Technical Description
14.2.7 Disturbances
Reverse Power
If the defined reverse power ("232.09 GdRvPwr" parameter) is exceeded for the time
"232.10 GdRvTm", the grid is disconnected. After reverse power, connection is blocked for at least
"231.03 ExtLkTm".
Grid failure
If a grid failure is detected (failure on the master phase), the grid is disconnected immediately.
Grid Phase Failure
The failure of a phase (e.g. broken fuse) on a slave device is treated as a phase failure. The slave
device then disconnects this phase. If the phase is detected as being available again, it is reconnected.
The phase failure on the master device is treated as a grid failure (see above).
Slave Device Failure
If a slave device fails, the system continues to operate using the remaining devices of the cluster.
14.2.8 Limits and Power Adjustment
The Sunny Island burdens the grid at each phase with the current defined in the parameter
"232.03 GdCurNom". The power that is not directly used by the consumers flows into the battery for
charging. At the same time, the limits for the AC charging current limit ("210.02 InvChrgCurMax"
parameter) on the Sunny Island and the DC charging current limit ("222.01 BatChrgCurMax"
parameter) are active. If the battery voltage reaches the charging voltage target value, it is also
reduced (see section 13.4”Charge Control” (page99)).
If the current set using the parameter "232.03 GdCurNom" is not sufficient for powering the
consumers, the battery provides support.
Silent mode active
When silent mode is activated, the grid cannot be supported!
The grid may temporarily fail. This way, the voltage fed to the loads will be interrupted for
a short time.
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