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
wattage of the appliance. The electrical appliances generally have a label showing their rated voltage,
frequency, 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.
Incandescent lamp, heater, etc. with a power factor
of
1
.O
Total power consumption must be equal to or less than. the rated output of the generator.
Example:
A
rated 3000W generator can turn thirty lOOW incandescent lamps
on.
Fluorescent lamps,mercury lamps, etc. with a smaller power factor
Select a generator with a rated output equivalent to 1.2 to 2 times
of
the power consumption of the
load.
Example:
A
400W mercury lamp requires 600W to 700W power source to be turned
on.
A
rated 3000W generator can power four or five 400W mercury lamps.
NOTE1: If
a
power factor correction capacitor is not applied to the mercury lamp or fluorescent
lamp, the more power shall be required to drive those lamps.
A
rated
3000
W
generator can drive one or
two
400
W
mercury lamps without power factor
correction capacitors.
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,
efficiency should be taken into account
as
explained in Item
(5)
on
the following page.
Motor driven tools and light electrical appliances
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 250W electric drill requires a 400W generator to start it.
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
900W
compressor requires a 4500W generator to drive it.
NOTEi: Motor-driven appliances require the aforementioned generator output only at the starting.
Once their motors are started, the appliances consume about
1.2
to
2
times their rated
power consumption
so
that the excess power generated by the generator can be used
for other electrical appliances.
NOTE2
Motor-driven appliances mentioned
in
ltems
(3)
and
(4)
vary
in
their required motor
starting power depending on the kind of motor and start-up load. If it is difficult to
determine the optimum generator capacity, select a generator with
a
larger capacity.
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29
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