Outback Power Systems GS8048 Operator Manual - Manual (Page 19)

Operation
900-0020-01-00 Rev B 17
 The independent inputs are intended to simplify the connection to multiple AC sources; however, only one
input can be used at a time. If both inputs are powered, the default setting is for the inverter to accept the
GRID input. This can be changed. In the MATE3 system display, these priorities are selected using
Input
Priority in the AC Input and Current Limit menu.
 Six input modes are available which affect the Radian inverter’s interactions with AC input sources. The
Grid Tied mode allows the Radian to sell power using the input connection. The Support mode can use
battery power to assist a smaller AC source. See page 9 for descriptions of these and other input modes.
 There are a number of considerations when selecting the type and size of an AC generator. (See the section
entitled Generator on page 18.)
 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. (See AC Current Settings on the next page. See the Radian Series Inverter/Charger
Installation Manual for more information.)
 The loads powered by the inverter must not exceed the size of the inverter’s transfer relay. (See the section
entitled “Transfer” on page 18.)
CAUTION: Equipment Damage
Current draw in excess of the inverter’s transfer relay rating can damage the transfer
relay. This damage is not covered by warranty.
AC Current Settings
The AC current settings control the amount of current that the inverter draws from the source(s). The
amount of current is controlled by the grid or generator limit settings. These settings should be
adjusted to match the size of the input circuit breaker. In the MATE3 system display, if the
Inverter
Input Priority or AC Input and Current Limit menus are set to Grid, the inverter uses the grid settings.
If the menus are set to
Gen, the inverter uses the generator settings.
 This is intended to protect a generator or source that may not be large enough to supply enough current for
both charging and loads. If the combined charging and loads exceed this 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 Support input mode allows the Radian inverter to support the AC source with power from the batteries.
See page 10.
 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 Configuration Wizard in the MATE3
can perform this calculation. However, the inverters do not perform this calculation. If the MATE3 or the
Configuration Wizard are not used, it is necessary to divide the input size by the number of inverters and
assign an equal part of the amperage to each port.
AC Source Acceptance
The input source must meet the following specifications to be accepted:
 L1 (to neutral) 120 Vac, ± 12 Vac (default setting), and
 L2 (to neutral) 120 Vac, ± 12 Vac (default setting), and
 60 Hz, ± 6 Hz
When these conditions are met, the inverter will close its transfer relay and accept the input source.
This occurs after a delay which is specified below. If the conditions are not met, the inverter will not
accept the source. If it was previously accepted and then rejected, the inverter will open the relay and
return to inverting power from the batteries.
 The voltage limits can be adjusted to allow (or exclude) a source with weak or irregular voltages. These
items are adjustable in the appropriate menu of the MATE3 ( Grid AC Input Mode and Limits or Gen AC