Backup; Mini Grid - Outback Power Systems FXR2012E Operator's Manual

Operation
Failure

Backup

The Backup mode is intended for systems that have utility grid available as the primary AC source.
This source will pass through the FXR inverter's transfer circuit and will power the loads unless utility
power is lost. If utility grid power is lost, then the inverter will supply energy to the loads from the
battery bank. When the utility power returns, it will be used to power the loads again.
BENEFITS :

This mode will continuously maintain the batteries in a fully-charged state, unlike the Support mode. It
does not have the overhead consumption of the UPS mode.

Mini Grid

In Mini Grid mode, the FXR inverter automatically rejects an AC source and runs solely from battery
(and renewable) energy. The inverter only connects to the AC source (usually the utility grid) when
the batteries run too low.
The FXR inverter runs on battery-supplied power for as long as the batteries can be sustained. It is
expected that the batteries will also be charged from renewable sources such as PV. When the
batteries become depleted, the system reconnects to the utility grid to operate the loads.
The inverter will reconnect to the utility grid if the battery voltage decreases to the Connect to Grid
set point and remains there for the Delay time period. These items are shown in the tables which
begin on page 76.
While connected to the utility grid, the FXR charger can be set either on or off. If the charger is turned
on, the inverter will proceed through a full charging cycle. Upon reaching float stage, the inverter will
disconnect from the grid.
If the inverter is connected to the utility grid and the charger is turned off, another DC source such as
renewable energy should be present to charge the batteries. The inverter will observe the batteries as
if it was performing the charge. When the batteries reach the required voltages and charging times to
achieve float stage, the inverter will disconnect from the grid. This means that the regulator for the
renewable source must be set to the same settings as the inverter (or higher). Check the settings of
both devices as needed.
See page 32 for more information on the battery charging cycle.
BENEFITS :

Mini Grid mode allows a system to minimize or eliminate dependence on the utility grid. This is only
possible if certain conditions are met. See below.
NOTES
:

The FXR 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 Offset function is inapplicable when
the inverter disconnects from an AC source. The renewable energy supports the inverting function instead.

This mode has similar priorities to the high-battery transfer (HBX) function used by the MATE3 system
display. However, it is not compatible with HBX and cannot be used at the same time. When using Mini
Grid mode, the system display should disable HBX to prevent conflicts.
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