REV
03
‐
13
Inverter
Protection
Features
The
RED
LED
Indicator
light
will
turn
on
and
the
inverter
will
turn
itself
off
automatically
when:
1.
The
power
input
from
the
battery
drops
to
9.5
volts.(When
the
power
input
drops
to
10.5
volts,
an
alarm
will
sound
for
an
extended
period).
2.
The
power
input
from
the
battery
exceeds
15.5
volts.
3.
The
continuous
draw
of
the
equipment
or
appliance
being
operated
exceeds
200
watts.
4.
The
surge
draw
of
the
equipment
or
appliance
being
operated
exceeds
400
watts.
5.
The
circuit
temperature
exceeds
165°F.
Note
•
The
inverter
is
equipped
with
a
cooling
fan
which
is
designed
to
run
continuously
while
the
inverter
is
operating.
Automatic
shut
down
caused
by
high
circuit
temperatures
will
occur
when
the
cooling
fan
is
unable
to
maintain
a
cool
enough
temperature
for
safe
operation
of
the
inverter.
•
In
the
event
of
automatic
shut
down
or
continuous
audible
alarm,
turn
the
inverter
rocker
switch
to
the
OFF
(0)
position
until
the
source
of
the
problem
has
been
determined
and
resolved.
How
Power
Inverters
Work
There
are
two
stages
in
which
a
power
inverter
changes
the
12
‐
volt
DC
(or
battery)
power
into
110V
AC
(household
current).
STAGE
1:
The
inverter
uses
a
DC
‐
to
‐
DC
converter
to
increase
the
DC
input
voltage
from
the
power
source
to
145
volts
DC.
STAGE
2:
The
inverter
then
converts
the
high
voltage
DC
into
110V
AC
(household
current),
using
advanced
MOSFET
(Metal
‐
oxide
‐
Semiconductor
Field
Effect
Transistor)
transistors
in
a
full
bridge
configuration.
This
design
provides
all
our
inverters
with
the
capability
to
start
and
run
difficult
reactive
loads,
while
providing
excellent
overload
capability.
The
waveform
that
is
generated
by
this
conversion
is
a
"modified
sine
wave"
as
shown
in
the
diagram
below.
The
modified
sine
wave
produced
by
our
inverters
has
a
root
mean
square
(RMS)
voltage
of
110
volts.
The
majority
of
AC
voltmeters
are
calibrated
for
RMS
voltage
and
assume
that
the
measured
waveform
will
be
a
pure
sine
wave.
Consequently,
these
meters
will
not
read
the
RMS
modified
sine
wave
voltage
correctly
and,
when
measuring
the
inverter
output,
the
meters
will
read
about
20
to
30
volts
too
low.
To
accurately
measure
of
the
output
voltage
of
the
inverter,
use
a
true
RMS
reading
voltmeter
such
as
a
Fluke
87
Fluke
8060A
Beckman
4410,
Triplet
4200
or
any
multimeter
identified
as
"True
RMS"