Product Manual

Operation
900-0145-01-01 Rev B 15
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 35 for more information.
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 22 and 57.) 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.

A programmable delay time is available which will allow an AC source to stabilize before connection. In the
MATE3, this menu item is
Connect Delay
. It is available in both the
Grid AC Input Mode and Limits
and the
Gen AC Input Mode and Limits
menus, depending on which input is being programmed.

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 by operating the charger in
reverse. It 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.
Grid Tied
IMPORTANT:
Selling power to the utility company requires the authorization of the local
electric jurisdiction. How the utility company accommodates this will depend
on their policies on the issue. Some may pay for power sold; others may issue
credit. Some policies may prohibit the use of this mode altogether. Please
check with the utility company and obtain their permission before using this mode.
The
Grid Tied
mode allows the Radian inverter to become grid-interactive. This means that in addition
to using power from the utility grid for charging and loads, the inverter can also convert excess battery
power and sell it to the utility grid. Excess battery power usually comes from renewable energy
sources, such as PV arrays, hydroelectric turbines, and wind turbines.