Outback Power Systems GS7048E Operator's Manual page 22

Operation
The inverter remains connected to the utility grid in case the grid is needed. If large loads require the use of

grid power, no transfer is necessary to support the loads.
NOTES
:
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 35 for more information on Offset operation. However, the behavior of Offset in Grid Zero mode is
different because it uses the DoD Volts exclusively.
The inverter's battery charger cannot be used in this mode. However, the 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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900-0145-01-01 Rev A