SMA America, LLC
14 Connecting External Sources
Technical description
SI4548_6048-US-TB_en-13
135
14.2.8 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 line conductor), the grid is disconnected immediately.
Grid Phase Failure
The failure of a line conductor (e.g. broken fuse) on a slave device is treated as a phase failure.
The slave device then disconnects this line conductor. If the line conductor 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 fails, the system continues to operate using the remaining devices of the cluster.
14.2.9 Limits and Power Control
The Sunny Island burdens the grid at each line conductor with the current defined in the parameter
"232.03 GdCurNom". The power that is not directly used by the loads flows into the battery for
charging. At the same time, the limits for the AC charging current limit (parameter "210.02
InvChrgCurMax") on the Sunny Island and the DC charging current limit (parameter "222.01
BatChrgCurMax") are active. If the battery voltage reaches the charging voltage target value, it is
also reduced (see Section 13.4 "Charge Control", page 109).
If the current set using the parameter "232.03 GdCurNom" is not sufficient for powering the loads,
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 supply of the loads will be interrupted for
a short time.
Summary of Contents for Sunny Island 4548-US
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