Outback FXR2012A Operator's Manual page 24

Operation
NOTES :
IMPORTANT:
Setting DoD Volts too low will severely discharge the batteries. The battery bank may
not have sufficient reserve to provide backup in the event of a grid failure. To prevent
the loss of power, load use and the DoD Volts setting should be planned accordingly.

If the renewable energy source is not greater than the size of the inverter loads, this mode will not work well
over time. The renewable source must be capable of charging the batteries as well as running the loads.
This occurs when renewable energy production exceeds the DoD Amps setting.

The inverter will offset the loads with excess renewable energy if it is available from the batteries. See
page 42 for more information on Offset operation. However, the behavior of Offset in GridZero mode is
different because it uses the DoD Volts exclusively.

The inverter's battery charger cannot be used in this mode. However, the charger menu settings and timer
operations are not changed when this mode is selected.

The battery should be discharged whenever possible in the attempt to "zero" the grid usage. If the DoD
Amps setting is limited or loads are not present, the batteries will be unable to accept much renewable
recharging the next time it is available. The renewable energy will be wasted, leaving the system
dependent on the utility grid more than necessary.
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