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9. OPERATIONAL LIMITS OF THE GENERATOR
9-1 AC OUTPUT:
Electric appliances normally have rating labels, showing the rated voltage. frequency. power
consumption (input power).
and other listings.
The input power specified on such labels is what is required to drive the appliance.
When an appliance is to be connected to the generator. the power factor. starting current. and other factors of the appli-
ance must be taken into account.
9-l-l NET RESISTANCE LOAD:
Incandescent lamps. electric heaters, etc.. can be run off the generator if its capacity matches the total of the respective
appliances. Each of these appliances normally have a power factor of 1 .O.
Example :
This generator can provide enough power to operate five 1OOW incandescent lamps.
9-l-2 ELECTRIC APPLIANCES WITH A POWER FACTOR LESS THAN 1.0:
Fluorescent lamps and mercury lamps normally have a low po\ver factor. Therefore. the generator is required to generate
approximately 1.2 to 2 times the power consumed by each load appliance.
Example: With this generator. three to five 8OW mercury lamps can be operated.
9-l-3 MOTOR LOAD:
Generally. motors require a large starting current every time they are started. Therefore. when the generator is
used
to run
a motor, the greatest motor starting load is applied.
The rates of power supply which the generator is required to produce for motor loads. are categorized into two sections.
depending on the types of motor and load conditions at time of starting.
1) Motors (mainly rectifier motors) used for electric drills and similar devices:
Sormally, the motors used for electric drills and similar appliances require the generator to produce approximateI>- I.1
to 3 times the power consumed at time of starting.
Example: To drive a 2OOW electric drill. a generator with capacity of about 300 to 600W is necessary.
2) Motors (mainly induction motors) used for pumps and compressors:
Pump and compressor drive motors require the generator to produce 3 to 5 times the power consumed when they are
running. at time of starting. This is because these motors have loads w-hen the>- start.
Example: To drive a 2OOW submersible pump. a generator with a capacity of approximately 600 to IOOOW is neces-
sary.
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