OutBack Power FLEXMax Series Owner's Manual

Applications
102 900-0009-01-00 Rev C
Grid-Interactive Settings
When using an OutBack inverter, FLEXmax, HUB, and system display, set the FLEXmax to GT in the
Advanced menu. GT mode allows the inverter to manage the FLEXmax Float setting. It ensures the
FLEXmax always keeps the battery above the sell voltage of the inverter. (See page 48.)
When using a FLEXmax charge controller with an inverter without the use of a HUB, GT mode will not
work because the FLEXmax cannot communicate with the inverter. In this situation, when selling
electricity back to the grid, keep the inverter’s “sell” voltage setting below the FLEXmax Float setting.
In a 24-volt battery system, the difference should be at least 0.5 Vdc. In a 48-volt system, the
difference should be at least 1.0 Vdc.
Charge Controller Efficiency vs. Input Power
Figure 103 Efficiency Curves