DETERMINING ELECTRICAL LOAD FOR GENERATOR

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You must decide what electrical load your generator can power. Do this before using generator. Use the following four-step method. It will help you select a load that is not too large. Make sure total wattage of all electrical loads does not exceed 5000 watts. Electric motors present a special problem when figuring load. Read Step 3 carefully.

1.Make two lists of items you want powered by generator. List all motors and motor-powered appliances in one. List all lights, small appliances, etc. in the other. For standby service to home or building, only include items you must power.

2.Enter running watts of each item except motors. The light bulb or appliance nameplate lists its wattage. Remember, 1KW = 1000 watts. Note: The name- plate may not list wattage. It may only list volts and amps. The formula for finding wattage is: Volts x Amps = Watts. For example: An appliance name- plate states 3 amps at 120 volts. 3 amps x 120 volts = 360 watts.

3.Electric motors present a special problem. They require up to 3-times their rated wattage to start. Chart 2, below, shows starting watts for different size motors. For example: an electric motor nameplate states 5 amps at 120 volts. 5 amps x 120 volts = 600 watts running. Multiply this figure by 3. This will show the starting watts needed. 600 watts x 3 = 1800 watts to start. When figuring the generator load for motors, you must use the starting watts figure. Do not use the running watts figure. Note: Some motors require nearly the same wattage to run as to start. These items include saws, drills, hair dryers, and food mixers. See Chart 1 for typical appliance wattage examples.

4.Add watts and starting watts of all items. This total must not be larger than 5000 watts. It is a good idea to have up to 25% extra capacity for future needs or extra equipment.

Chart 1—Typical Electric Appliance Wattages

 

Running

Starting

 

Running

Starting

Equipment

Watts

Watts

Equipment

Watts

Watts

 

 

 

 

 

 

Light bulb (100W)

100

100

1/2" Drill

1000

1250

Radio

150

150

Toaster

1200

1200

Fan

200

600

Coffee maker

1200

1200

Television

400

400

Skillet

1200

1200

Furnace fan (1/3 hp)

600

1800

14" Chain saw

1200

1500

Vacuum cleaner

600

750

Water well pump

 

 

Sump pump (1/3 hp)

700

2100

(1/2 hp)

1000

3000

Refrigerator/freezer

800

2400

Hot plate/range

 

 

6" Circular saw

800

1000

(per burner)

1500

1500

Floodlight

1000

1000

Water heater

5000

5000

 

 

 

 

 

 

Chart 2

 

 

Approximate Starting Watts*

 

 

 

 

 

 

 

Motor

Approximate

Universal

Repulsion

 

Split

HP

Running

Motors

Induction

Capacitor

Phase

Rating

Watts

(small appliance)

Motors

Motors

Motors

 

 

 

 

 

 

1/8

275

400

600

850

1200

1/4

400

500

850

1050

1700

1/3

450

600

975

1350

1950

1/2

600

750

1300

1800

2600

3/4

850

1000

1900

2600

x

1

1000

1250

2300

3000

x

1 1/2

1600

1750

3200

4200

x

2

2000

2350

3900

x

x

 

 

 

 

 

 

*– Always use starting watts, not running watts, when figuring correct electrical load. x – Motors of higher horsepower are not generally used.

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Image 18
Master Lock MGY5000 Determining Electrical Load for Generator, Chart 1-Typical Electric Appliance Wattages

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