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7.
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7-1
AC
OUTPUT
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 1OOOW generator can turn ten lOOW incandescent lamps
on.
Fluorescent lamps, Motor driven tools, light electrical appliances, 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. 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.
NOTE
7:
If a power factor correction capacitor
is
not applied to the fluorescent lamp, the more
power shall be required to drive the lamp.
NOTE
2:
Nominal wattage of the fluorescent 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.
Mercury lamps with a smaller power factor
Loads for mercury lamps require 2 to
3
times the indicated wattage during start-up.
Example:
A
400W mercury lamp requires
800W
to 1200W power source to be turned
on.
A
rated 1OOOW generator can power one 400W mercury lamp
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
9OOW
compressor requires a 4500W generator to drive it.
NOTE
1:
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.
NOTE
2:
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 difficult to
determine the optimum generator capacity, select a generator with a larger capacity.
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