Kohler Detailed Guide on 920-805 Dumps and Generator Wattage Requirements

Page 47

Appendix A Generator Selection and Wattage Requirements

General Wattage Requirements

Appliance Loads

Consider the total wattage requirements (lights, motors, appliances) when selecting a generator set, or when sizing wattage usage in which available space and construction limit the size of the generator set.

Motor Loads

When figuring generator set capacity requirements for loads that include electric motors, consider the high current demanded by the motors during startup. The inrush or starting current is typically 2 to 3 times higher than that required when the motor reaches normal operating speed. Allow a reserve for inrush demands plus other loads that could be on the line as the electric motor starts. Use Figure 1 as a guide when selecting generator set capacity requirements involving motor loads.

 

Starting

 

Motor

(Inrush)

Running

HP

Watts

Watts

 

 

 

1/4

750

330

 

 

 

1/3

1000

400

 

 

 

1/2

1500

600

 

 

 

3/4

2000

750

 

 

 

1

3300

1100

 

 

 

2

4000

2000

 

 

 

3

5000

3000

 

 

 

Figure 1 Motor Requirements

Generator sets often furnish AC for appliances such as TVs, stereos, and electric water heaters. Except for the resistance-type loads such as the water heater, the requirements for appliances are usually low. Do not overlook such loads when figuring the total requirements. Allow a reserve capacity for anticipated appliance loads to avoid overloading a generator set.

Lighting Load

To calculate the lighting load, add the wattage of each generator set-operated lamp. Note that not all of the lights or lamps are on the generator set AC circuit—some are DC powered by a 12-volt battery. Ensure that the calculated total wattage includes only lights actually on the generator set AC circuit.

Air Conditioners

The starting characteristics of air conditioners vary greatly—for example, one 12,000 Btu unit has lower starting requirements than a 10,000 Btu unit of another variety. When using only one unit, there is usually no starting problem provided that the lighting and appliance load is not too high when starting the generator set.

Simultaneous starting of two air conditioning units, however, can present problems if the generator set capacity is marginal. Because of the variation in starting characteristics among air conditioners, this publication makes no statements regarding multiple-motor starting capabilities of the generator set covered. Consider delayed starting or the use of easy-starting devices on air conditioner units whenever simultaneously starting more than one motor.

See Figure 2 for typical air conditioner requirements. The requirements vary among different manufacturers.

Air Conditioner Size (Btu)

 

7,000

9,000

12,000

16,000

24,000

 

 

 

 

 

 

 

 

 

 

Voltage

115

230

115

230

115

230

115

230

230

 

 

 

 

 

 

 

 

 

 

Full load amps

9.3

4.8

9.9

5.0

11.8

6.3

16.3

8.0

11.6

 

 

 

 

 

 

 

 

 

 

Rated load amps

7.7

4.0

7.0

3.5

8.9

4.8

13.0

6.2

10.2

 

 

 

 

 

 

 

 

 

 

Locked rotor amps

34.0

20.0

40.0

20.0

50.0

31.0

75.0

36.0

56.0

 

 

 

 

 

 

 

 

 

 

Starting (inrush) watts

3910

4600

4600

4600

5750

7130

8630

8280

12,900

 

 

 

 

 

 

 

 

 

 

Running watts

886

920

805

805

1020

1100

1500

1430

2350

 

 

 

 

 

 

 

 

 

 

Figure 2 Typical Air Conditioner Requirements (60 Hz)

TP-6335 9/04

Appendix A-1

Image 47
Contents TP-6335 9/04 ModelPage Table of Contents Page Accidental Starting Safety Precautions and InstructionsBattery Exhaust System Engine Backfire/Flash FireHazardous Voltage/ Electrical Shock Fuel SystemHazardous Noise Moving Parts Hot Parts246242 VI Safety Precautions and Instructions TP-6335 9/04 Generator Set Operation Installation StandardsGenerator Set Specifications IntroductionIntroduction TP-6335 9/04 Vehicle-Floor Mounting Location and MountingGeneral Considerations LocationLocation and Mounting TP-6335 9/04 Block Heaters High Water Temperature SwitchCooling System Air RequirementsCooling System TP-6335 9/04 Exhaust System Exhaust Piping, If Used PlanningClearance Requirements Gasoline Fuel SystemFuel Lines Fuel Filters or StrainersLP Gas Fuel Pump Lift Capability Max., Gasoline Models Fuel Pump Lift and Fuel ConsumptionFuel System TP-6335 9/04 AC Load Lead Connections Electrical SystemElectrical Connections Transfer Switch Connections Wire AC Circuit Circuit Breaker Considerations Circuit ProtectionElectrical Connections Circuit Breaker InstallationADC 2100 Continuous Power Mode Jumper CCA Battery and ConnectionsView B Remote ConnectionElectrical System TP-6335 9/04 Dimension Drawing, Gasoline Fuel System Installation DrawingDimension Drawing, LP Fuel System Dimension Drawing, Floor Template Installation Drawing TP-6335 9/04 Reconnection/Adjustments Four-Lead Reconnection 100--120-Volt, 2-Wire Configuration200--220--240-Volt, 2-Wire Configuration For Models with ADC Controller Software Version Number Configuration Mode Time OutAdvanced Digital Control ADC Voltage Adjustment Adjusting the Voltage, Gain, and Volts/HzOn Figure Output Voltage Adjustment ModeFrom Figure V EController Configuration Controller Parameters N c V E 11 Save Mode after configuring generator set parameters Reconnection/Adjustments TP-6335 9/04 General Wattage Requirements Appendix a Generator Selection and Wattage RequirementsAnsi Appendix B AbbreviationsLCB Page Page By Kohler Co. All rights reserved