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Operation
900-0020-01-00 Rev A 19
Offset
This function is designed to use excess battery energy to power the loads, even when an AC source is
present. This allows the system to take advantage of renewable energy sources, in effect “offsetting”
dependence on the AC source.
When a renewable source of energy raises the batteries above a designated reference point (or
“target”), the inverter exports power to the loads in order to bring the voltage back down or to
prevent it from rising further.
The inverter uses several set points as targets for the offset function, particularly the battery charger
settings. In the MATE3, the
Absorb Voltage
,
Float Voltage
, and
Equalize Voltage
settings are all used
as reference voltages. While the battery charger is operating, it will regulate the voltage at a level
appropriate for the target setting.
If none of the battery charger’s timers are active, the target voltage used by the Radian inverter is
Sell Voltage
in the
Grid-Tie Sell
menu. Unlike the other target voltages, the Radian inverter cannot
import AC power to raise the batteries to the
Sell Voltage
set point. It can only use excess DC power,
if it is available, and export it as AC power.
(See page 21 for more information on how Offset relates to the battery charger. See the MATE3
Owner’s Manual to change any of these settings.)
NOTES
:
If the Radian inverter is in the
Grid Tied
input mode and more renewable energy is available than can be
offset by the loads, the inverter will sell the remainder to the utility grid. Although the inverter can use the
Sell Voltage
setting as a target in most input modes (see below), it is unable to sell power to the utility grid
unless the
Grid Tied
mode is selected.
If the inverter is in the
Support
,
UPS
,
Backup
, or
Mini Grid
input modes and more renewable energy is
available than can be offset by the loads, it means the inverter is capable of running all of its loads using
renewable energy. The inverter will disconnect from the AC source as long as the excess renewable energy
is present.
The Offset function is not active when the
Generator
input mode is selected.