Operation
30
900-0167-01-00 Rev A
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 25 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. 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 inverter’s battery charger and grid-interactive function have individual settings. However, the
AC Limit
settings can also limit the charging or selling current.
The
GridZero
input mode requires the inverter to use DC sources, limiting the amount of AC current used.
See page 23.
The
Support
input mode allows the inverter to support the AC source with battery power. See 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 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 Configuration Wizard in the
MATE3 can perform this calculation. However, the inverters do not perform this calculation. If the
Configuration Wizard or similar tools are not used, 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. This is true in all modes
except
Grid Tied
:
Voltage (
GRID
input selection): 108 to 132 Vac
Voltage (
GEN
input selection): 108 to 140 Vac
Frequency (both input selections): If the output frequency is set to 60 Hz (default), the input acceptance
range is 54 to 66 Hz. If output frequency is set to 50 Hz, the input range of acceptance is 45 to 55 Hz.
See the menu tables which begin on page 76 for programming information for these items.
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. This occurs after a specified transfer delay, which is an
adjustable menu item.
IMPORTANT:
The inverter’s output voltage can be adjusted to a different nominal value for a particular region.
(See page 28.) If this occurs, the source acceptance range should be adjusted to match this
nominal value or the inverter may not accept the new source normally.
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