Outback FM60 User Manual

Applications
104 900-0009-01-00 Rev D
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 51.)
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.
FLEXmax Efficiency vs. Input Power
Figure 103 Efficiency Curves