Product Manual

Operation
900-0161-01-01 Rev B 13
Support
The
Support
mode is intended for systems that use the utility grid or a generator. In some
cases the amount of current available from the source is limited due to size, wiring, or other
reasons. If large loads are required, the Radian inverter augments (supports) the AC source.
The inverter uses battery power and additional sources to ensure that the loads receive the
power they demand.
In a MATE3-class system display, the
Grid Input AC Limit
dictates the maximum AC draw for
the Grid input. The
Gen Input AC Limit
sets the maximum draw for the Gen input. The
Support
function takes effect if the AC demand on either input exceeds the
AC Limit
setting.
BENEFITS
:

Large inverter loads can be powered while staying connected to the AC input, even if the input is
limited. The added battery power prevents overload of the input source, but the batteries are not in
constant use.

The Radian inverter will offset the loads with excess renewable energy if it is available from the
batteries. See page 36 for more information on the
Offset
function.
NOTES
:
IMPORTANT:
The inverter will draw energy from the batteries when the loads exceed the appropriate
AC Limit
. With sustained loads and no other DC source, the batteries may discharge to the
Low Battery Cut-Out
point. The inverter will shut down with a
Low Battery
error. (See
pages 21 and 51.) To prevent the loss of power, load use should be planned accordingly.
IMPORTANT:
A “noisy” or irregular AC source may prevent
Support
from working normally. The inverter
will transfer the power, but will not support the source, charge the batteries, or interact with
the current in any other way. This problem is more common with generators smaller than
the wattage of the inverter.

Because the inverter limits the current draw from the AC source, it will reduce the charge rate as
necessary to support the loads. If the loads equal the appropriate
AC Limit
setting, the charge rate
will be zero.

If the AC loads exceed the AC Limit setting, the Support function is activated. Instead of charging,
the inverter will take power from the batteries and use it to support the incoming AC current.

The
Support
function is not available in any other input mode.