Product Manual

Operation
18 900-0145-01-01 Rev B
Backup
The
Backup
mode is intended for systems that have utility grid available as the primary AC source.
This source will pass through the Radian inverter’s transfer circuit and will power the loads unless
utility power is lost. If utility grid power is lost, then the Radian 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 Radian 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 Radian 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 Table 17 on page 67.
While connected to the utility grid, the inverter’s 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 Radian (or higher). Check the settings of
both devices as needed.
See page 27 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 the Notes below.
NOTES
:

The Radian 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 Offset function is inapplicable when
the Radian 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.
Failure