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Operation
900-0112-01-00 Rev A 13
Description of Functions
All items identified as settable or adjustable have set points which can be accessed using the remote
system display. (See the system display manual for instructions on locating these set points.) The
default settings and ranges of adjustment are listed near the end of this book, beginning on page 43.
Inverting
A GFX inverter uses a transformer and a high-frequency H-Bridge FET design to convert DC voltage
from batteries into AC voltage that is usable AC by appliances. It will continue to do this as long as the
batteries have sufficient energy. The batteries can be supplied or recharged from other sources, such
as solar, wind, or micro-hydroelectric power.
The inverter requires batteries to operate. Other sources may not maintain DC voltages that are
consistent enough for the inverter to operate reliably.
CAUTION: Equipment Damage
Do not substitute other DC sources in place of the batteries. High or irregular voltages
may damage the inverter. It is normal to use other DC sources in conjunction with the
batteries and the inverter, but not in place of the batteries.
Certain features will affect the inverter’s operation. These features only operate when the inverter is
generating AC power on its own. They do not function when the inverter is being supplied by an
AC source.
Low Battery Cut-Out (LBCO):
This feature prevents the inverter from draining the batteries completely. It
will stop functioning and give a Low Battery Voltage error when the DC voltage drops below a specified
level for 5 minutes. This is one of the Error messages described on page 34. This function is intended to
protect both the batteries and the inverter’s output. (Continuing to invert on a low DC voltage may
produce a distorted waveform.) This item is adjustable.
Low Battery Cut-In (LBCI):
The recovery point from Low Battery Cut-Out. When the DC voltage rises
above a certain level for 10 minutes, the Low Battery error will clear and the inverter will resume
functioning. This item is adjustable.
Adjust Output Voltage:
The inverter’s AC output can be turned up or down by a certain amount, to adjust
for conditions. This item is adjustable.
The inverter is also controlled by a high battery cut-out function. If the DC voltage rises above a specified
level, the inverter will immediately stop functioning and give a
High Battery Voltage
error. This is one of
the Error messages displayed on page 34. (If the voltage drops below this point, the inverter automatically
recovers.)
For a 12-volt inverter, this voltage is 20 volts.
For a 24-volt inverter, the voltage is 40 volts
For a 48-volt inverter, the voltage is 80 volts.
The high battery cut-out voltages cannot be changed.
This function is intended to protect the inverter’s output and loads. Continuing to invert on a high DC
voltage may produce a distorted waveform. Note that the inverter’s high battery cut-out does not alleviate
or solve the high battery condition itself; the cause is an external condition.