Bedienungsanleitung PowerTech PTS-20KSI-3-3 (Seite 32 von 42) (Englisch)

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MOTOR LOADS

When figuring generator set capacity requirements for installation involving motor loads, do not

overlook the high current demanded by the motor during start-up. The “In-Rush” of starting current may

be 2 to 5 times higher than that required when the motor reaches normal operating speed. Reserve

capacity must be allowed for in rush demands plus other loads, which could be on the line as the motor

starts.

Air conditioning units are the most common type of motor loads for a generator set in a

recreational vehicle. The starting characteristics of the different makes of air conditioners vary greatly.

For example, a particular 12,000 BTU unit may have lower starting requirements than a 10,000 BTU

unit of another make. When only one unit is involved there is usually no starting problem provided of

course the lighting and appliance load is not too high when unit is started.

The trend seems to be toward larger capacity air conditioners and the use of more than one unit in larger

vehicles. Simultaneously starting two large units can present a problem if the capacity is marginal.

Because of the variation in starting characteristics of the different makes of air conditioners, no definite

statement can be made in this publication regarding multiple-motor starting capabilities.

Delayed starting or use of “easy starting” devices on air conditioner units should be considered

whenever simultaneous starting of more than one motor is involved. The starting and running

requirements of some motor loads common to mobile applications are listed in the table below. Use this

as a guide when selecting generator set capacity requirements involving motor loads. Also note the

Kilowatt De-rating factor for generator set capabilities regarding air conditioners. Capabilities will vary

according to “Kilowatt De-rating”.

BASED ON CODE “G” ELECTRIC MOTOR

ELECTRIC MOTOR

HORSEPOWER

STARTING WATTS RUNNING WATTS

½ 2000 1100

1 3800 1800

2 6000 2800

3 8000 4000

4 11000 5500

5 13000 6500

KILOWATT DE-RATING

All units are rated at 1.0 power factor. The Kilowatts of the generator set will decrease 3.5% per

1,000 feet (305m) above 500 feet (152m) above sea level. De-rate 1% for every 10 °F (5.5°C) above

68°F.

ELECTRICAL LOADS

While the electrical load of the vehicle should have been calculated prior to purchase of the generator

set, you may want to recheck the load before installing the set to make sure the capacity is ample to meet

the demands without possible overloading.

The lighting load is usually easiest to calculate in most cases, simply add the wattage of each

lamp to be operated off the generator set. Note that in many applications, not all of the lights or lamps

are in the generator sets AC circuit. Some are DC powered by the 12-volt battery in the vehicle. Make

sure the total includes only lights actually on the generator sets AC circuit. The lighting load is usually

not to heavy in mobile installations however it must be accurately calculated to prevent overloading. For

example, if all lights are on at the same time and the air conditioner or other motor equipment starts up,

this may possibly cause an overload situation.

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