Connecting External Sources SMA Solar Technology AG
122 SI5048-TEN093630 Technical Description
The standard solution in such cases is to use a transfer switch that can be purchased as a manual or
an automatic switch. By using such a switch, a diesel generator is connected to the AC2 connection,
to which the public grid is normally connected, as displayed in the figure below:
To use such a switch, proceed with the installation as follows:
1. Connect the negative pole of the DigIn connection on the Sunny Island to the negative pole of
the BatVtgOut connection, also located on the Sunny Island.
2. Connect the positive pole of the DigIn connection to a NO connection of an auxiliary contact
of the transfer switch.
3. Connect the positive pole of the BatVtgOut connection to the second contact of the same
auxiliary contact on the transfer switch.
An auxiliary contact is used because the Sunny Island must “know” whether it is connected to the
public grid or whether it must manage a diesel generator.
To enable such a kind of operation, you must set the "231.06 ExtSrc" parameter to "GenGrid"
(see chapter 8.2”Starting the Quick Configuration Guide (QCG)” (page55)).
Settings Performed on the Generator and Grid
All the settings made for the generator and grid in the submenus also apply to the
“GenGrid” selection.
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