Outback Power Systems GS3548E Operators Manual - Manual (Page 21)

Operation
900-0145-01-01 Rev A 19
Mini Grid mode is also incompatible with the Grid Use Time and Load Grid Transfer functions of the MATE3
system display. These functions do not have similar priorities to
Mini Grid or HBX, but they do control the
inverter’s connection and disconnection with the grid. Mini Grid should not be used with these functions.
 When deciding whether to use Mini Grid mode or HBX, the user should consider the aspects of each.
∼ Mini Grid logic is based in the Radian inverter and can function in the absence of the MATE3. HBX logic
is based in the MATE3 and cannot function unless the MATE3 is installed and operating.
∼ Mini Grid can use utility grid power to fully recharge the batteries every time it reconnects to the
grid. HBX can only do so under specific circumstances.
∼ HBX set points have a wide range of settings. Mini Grid uses settings intended to protect the batteries
from excessive discharge; however, most of its settings are automatic and do not allow customization.
∼ HBX works more efficiently with a larger renewable source, but there is no specification for renewable
size. Mini Grid cannot work properly unless the source is larger than the size of the loads. If this
condition is not met, Mini Grid will not disconnect the inverter from the utility grid.
∼ HBX can be combined with the settings of any other input mode (Generator, UPS, etc.). The Mini Grid
input mode is limited to its own settings and does not have access to certain functions of other modes.
∼ See page 47 for more information on HBX, Grid Use Time, and Load Grid Transfer.
Grid Zero
In Grid Zero mode, the Radian inverter runs primarily from battery (and renewable) energy while
remaining connected to an AC source. The inverter only draws on the AC source (usually the utility
grid) when no other energy is available. Using the DC sources, the inverter attempts to decrease the
use of the AC source to zero.
In the MATE3 system display, the selectable options are
DoD Volts and DoD Amps. Any time the
batteries exceed the DoD Volts setting, the Radian will send power from the batteries to the loads. As
the battery voltage decreases to the DoD Volts setting, the inverter will reduce the rate of flow toward
zero. It will maintain the batteries at this setting.
The Radian inverter can manage large quantities of power. To prevent damage to the batteries from
rapid discharge, the rate of discharge can be limited using the
DoD Amps setting. This item should be
set lower than the amperage provided by the renewable source.
 When DoD Volts is set low, this mode allows more renewable energy to be delivered from the batteries to
the loads. However, it will also leave less of a battery reserve in the event of a grid failure.
 When DoD Volts is set high, the batteries will not be discharged as deeply and will retain more of a backup
reserve. However, not as much renewable energy will be sent to the loads.
The renewable energy source needs to exceed the size of the loads after accounting for all possible
losses. The renewable source is also required to charge the batteries after this mode discharges them.
The inverter’s battery charger does not function in
Grid Zero mode.
BENEFITS:
 Grid Zero mode allows a system to minimize or eliminate dependence on the utility grid. This is only
possible if certain conditions are met. See the Notes section.
 This mode puts battery and renewable energy to the most effective use without selling power to the utility
grid and without dependence on the grid.