OutBack Power Programming Guide

900-0125-12-01 Rev A
©2017 OutBack Power Technologies. All Rights Reserved.
Page 34
Page 35
M-3 High Battery Transfer (HBX)
In High Battery Transfer (HBX) mode, the system is connected to an
AC source such as the utility grid; however, it will use battery power
as the first priority. The AC source is locked out until needed.
In this mode, the system runs on DC power for as long as the batteries can be sustained. It is expected
that the batteries will be charged from renewable sources such as PV power. When the batteries become
depleted, the system reconnects to the AC source to operate the loads.
The batteries may be recharged during this time using the renewable source. When the batteries are
recharged to a high enough voltage, the system transfers back to the batteries as the primary source
(hence the name High Battery Transfer).
HBX Mode commands the inverter to:
o Connect to an AC source if the battery voltage has fallen below the Grid Connect voltage for the amount of time
set in
the (connect) Delay
set point
o Connect to an AC source if the battery state of charge (SOC) has fallen below the Grid Connect SOC for any
amount of time
o Disconnect the AC source and switch to powering the loads from the battery bank if the battery voltage has risen
above the Grid Disconnect voltage for the amount of time set in the (disconnect) Delay set point
o Disconnect the AC source and switch to powering loads from the battery bank if the battery state of charge (SOC)
ha
s risen above the Grid Disconnect SOC for any amount of time
IMPORTANT:
 HBX mode will control the master inverter in port 1 of a HUB Communications Manager.
The master will then instruct all subphase masters and slaves to connect or disconnect from the
AC input source.
 For best operation, the inverter’s charger should be turned off when HBX mode is in use.
This mode is intended for systems that rely primarily on the renewable energy source for charging.
The settings of HBX mode allow it to disconnect from the utility grid whenever it can charge
effectively using the renewable source. Use of the inverter's charger may interfere with these
priorities. This may keep both HBX mode and the inverter's charger from working effectively.
See the MATE3s Overview Guide (the CHARGER hot key) for instructions on shutting off
the charger.
System Voltage 12 V
High Voltage 13
Low Voltage 12
24 V 36 V
26 38
24 36
48 V
52
48
Time 1 hour 1 hour 1 hour 1 hour
HBX Mode Default Set Points
NOTES ON SELECTING HBX MODE:
 HBX mode has similar priorities to the Mini Grid mode used by FXR-class and Radian-class inverters.
However, it is not compatible with Mini Grid and cannot be used at the same time. To prevent conflicts
when using HBX mode, make certain not to select Mini Grid. (Selection of AC input modes can be found on
page 11. Information on Mini Grid and other modes can be found in the inverter Operator’s Manual.)
 HBX is also incompatible with the Grid Use Time and Load Grid Transfer functions in the MATE3s. 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. HBX should not be used with these functions. (See pages 36 and 37.)
 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 FXR inverter and can function in the absence of the MATE3s. HBX logic is based in
the MATE3s and cannot function unless the MATE3s 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.
Menu Items
 Enabled/Disabled
 Grid Connect — xx.x VDC (inverter-dependent)
The low-voltage level that causes the system to reconnect to the utility grid.
 (Grid Connect) Delay — 0 to 240 minutes
The delay period after reaching Grid Connect before the system reconnects to the utility grid.
 Grid Disconnect — xx.x VDC (inverter-dependent)
The high-voltage level that causes the system to disconnect from the utility grid.
 (Grid Disconnect) Delay — 0 to 240 minutes
The delay period after reaching Grid Disconnect before the system disconnects from the utility grid.
 Grid Connect SOC — 10% to 100%
The low-battery state of charge that causes the system to reconnect to the utility grid immediately.
 Grid Disconnect SOC — 50% to 100%
The high-battery state of charge that causes the system to disconnect from the utility grid immediately.
NOTES ON SETTINGS:
 The system must be in the Grid Disconnect state to allow HBX default settings to be changed.
 The Delay set points are used to prevent the inverter from switching to grid power in the event of a sudden,
sizable demand for power that may momentarily drop the voltage below the Grid Connect value.
 The SOC set points are only usable by a system equipped with a battery monitor.
HBXMATE3s Settings