Filter
Top Products
7.
RANGE
OF
APPLICATIONS
Generally,
the
power rating
of
an electrical appliance indicates the
amount
of
work that
can
be done
by
it.
The electric power required
for
operating
an
electrical appliance
is
not
always equal
to
the
output
watt-
age of the appliance.
The
electrical appliances
generally
have a label
showing
their rated voltage, fre-
quency, and power consumption
(input
wattage). The
power
consumption
of
an
electrical appliance
is
the
power
necessary
for
using
it. When
using
a
generator
for
operating
an
electrical appliance, the
power
factor
and
starting wattage
must
be
taken
into
consideration.
In
order
to
determine the
right
size generator,
it
is
necessary
to
add the
total
wattage
of
all appliances
to
be connected
to
the
unit.
Refer
to
the
followings
to
calculate the power
consumption
of
each appliance
or
equipment
by
its
type.
(1)
Incandescent lamp, heater, etc. with a power factor
of
1.0
Total power consumption
must
be equal
to
or
less than
the
rated
output
of
the generator.
Example
:
A
rated
3000W
generator can
turn
thirty
1
OOW
incandescent lamps
on.
factor
Select a generator
with
a rated
output
equivalent
to
1.2
to
2
times
of
the power
consumption
of
the
load. Generally the
starting
wattage
of
motor
driven
tools
and
light
electrical appliances are
1.2
to
3
times lager than
their
running
wattage.
Example
:
A
rated
250
W
electric
drill
requires
a
400
W
generator
to
start
it.
(2)
Fluorescent lamps, motor driven tools, light electrical appliances, etc. with a smaller power
NOTEl
:
If a power factor correction capacitor is not applied to the fluorescent lamp, the more power
shall be required to drive the lamps.
NOTE2
:
Nominal wattage of the fluorscent lamp generally indicates the output wattage of the lamp.
Therefore,
if
the fluorescent lamp has no special indication as to the power consumption, effi-
ciency should be taken into account as explained in Item
(5)
on the following page.
(3)
Mercury lamps with a smaller power factor
Loads
for
mercury lamps require
2
to
3
times the indicated wattage
during
start-up.
Example
:
A
400
W
mercury lamp requires
800
W
to
1200
W
power
source
to
be
turned
on.
A
rated
3000
W
generator
can
power
two
or
three
400
W
mercury lamps.
(4)
Initially loaded motor driven appliances such as water pumps, compressors, etc.
These appliances require large starting wattage which
is
3
to
5
times
of
running
wattage.
Example
:
A
rated
900
W
compressor requires a
4500
W
generator
to
drive it.
NOTEl
:
Motor-driven appliances require the aforementioned generator output only at the starting. Once
their motors are started, the appliances consume about
7.2
to
2
times their rated power con-
sumption
so
that the excess power generated by the generator can be used for other electrical
appliances.
NOTE2
:
Motor-driven appliances mentioned in items
(3)
and
(4)
vary in their required motor starting
power depending on the kind of motor and start-up load. If
it
is difficun to determine
the
optimum
generator capacify, select
a
generator with a larger capacity
-
20-