Product Manual

Operation
24 900-0161-01-01 Rev B
Input
When the Radian inverter input terminals are connected to a stable AC source, the inverter will
synchronize itself with that source and use it as the primary source of AC power. Its transfer
relay will engage, linking the AC source directly with the inverter’s output. It can also use the
source to charge batteries. (See
Battery Charging
on page 26.)

The loads powered by the inverter
must not
exceed the size of the inverter’s transfer relay.
CAUTION: Equipment Damage
Current draw in excess of the transfer relay rating can damage the transfer relay. This
damage is not covered by warranty. Use protective devices of appropriate size.

Two sets of AC input terminals are available. Both inputs are identical and can be used for any AC
source. However, for easy reference, the first input has been labeled
G
RID
(for the utility grid). The
second input is labeled
G
EN
(for a generator). These designations are also used in the menus of a
MATE3-class system display.
 Each input has a separate set of input criteria and input modes.
 The criteria, modes, and other programming for each input contain identical content.

The independent inputs are intended to simplify the connection to multiple AC sources; however, the
inverter can only use one input at a time. If both inputs are powered, the default setting is for the
inverter to accept the
G
RID
input. This can be changed. In a MATE3-class system display, these
priorities are selected using
Input Priority
in the
AC Input and Current Limit
menu.

The interactions with AC input sources are controlled by the various input modes. The
Grid Tied
mode allows certain models to sell power using the input connection. The
Support
mode can use
battery power to assist a smaller AC source. When
GridZero
mode is selected, the battery charger
cannot be used. See page 19 for descriptions of these and other input modes.
AC Current Settings
The AC current settings,
Grid Input AC Limit
and
Gen Input AC Limit
, control the amount of
current that the inverter draws from the source(s). When using either of the Radian’s AC inputs,
the appropriate setting limits the input. Adjust these settings to match the input circuit breakers.

The adjustment is meant to protect a generator or source that cannot supply enough current for both
charging and loads. If the combined charging and loads exceed the setting, the inverter will reduce
its charge rate and give priority to the loads. If the loads exceed this number on their own, the charge
rate will be reduced to zero.

The
AC Limit
settings can limit the charging current, although the charger has an individual setting.
(See page 27.) Note that this does not limit the current sold in
Grid Tied
mode. (See page 14.)

The
GridZero
input mode requires the inverter to use DC sources, limiting the amount of AC current
used. See page 18.

The
Support
input mode allows the Radian to support the AC source with battery power. See
page 13.

The AC input current is used to power both loads and battery charging. The combined amount
should not exceed the size of the AC overcurrent device or AC source. These devices should be
sized appropriately during planning and installation of the inverter system.

If multiple parallel inverters are installed with an AC source of limited amperage, the total combined
amperage settings for all units must be less than the AC input circuit. The Profile Wizard in a
MATE3-class system display can perform this calculation. However, the inverters do not perform this
calculation. If the system display or the Profile Wizard are not used, divide the input size by the
number of inverters and assign an equal part of the amperage to each port.
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