Xantrex Technology GT100E - Manual (Page 32)

Configuration
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Master/Slave Configuration
The Master/Slave system can be configured through the Xantrex Solar
GUI (Graphical User Interface) software, P/N 1-152577-01, or through
the Operator Interface Panel.
Establish remote or local communication with the GT100E, using the
Xantrex Solar GUI software.
To set a unit up as the Master Unit:
1. Click Tools > Inverter Data > Operational Configuration
2. Check the Configured Master check box
3. Click Send Configuration
4. Verify that the Present Inverter Data has the unit set as the Configured
Master unit.
Important:
If the inverter's date (not the workstation's!) is odd then the
Inverter is OPERATIONAL MASTER until midnight; if the inverter's date is
even, the Inverter is OPERATIONAL SLAVE until midnight.