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Application
Charts To Determine
Electrical Load for Generator
Remember: 1 kW = 1000
watts, 2 kW = 2000 watts ect.
The
formula to find wattage is: Volts
x Amps = Watts
Example: an appliance
nameplate states 3 amps at 120 volts.
3 amps x 120 volts = 360 watts
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Typical
Appliance Wattage
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Application/Equipment
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Running/Rated
Watts
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Starting/Surge
Watts
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| Light
Bulb (100w) |
100 |
100 |
| Radio
AM/FM |
50-200 |
50-200 |
| Radio,
CB |
50 |
50 |
| Fan |
200 |
600 |
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Television
|
300-400
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300-400
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Microwave Oven
|
700
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1000
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Air Conditioner (12,000 BTU)
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3250
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5000
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Furnace Fan (1/3 hp blower motor)
|
600
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1800
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Vacuum cleaner
|
600
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750
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Sump pump (1/3 hp)
|
700
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2100
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Refrigerator/freezer
|
800
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2400
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Deep Freezer
|
500
|
1500
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Circular saw
|
1000-2500
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2300-4600
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Circular saw 6"
|
800
|
1000
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Floodlight
|
1000
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1000
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Drill 1/2" Electric
|
1000
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1250
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Toaster
|
1200
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1200
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Coffee maker
|
1200
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1200
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Skillet
|
1200
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1200
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Chain saw 14" Electric
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1200
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1500
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Water well pump (1/2 hp)
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1000
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3000
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Hot plate/range (per burner)
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1500
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1500
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Table saw 10"
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2000
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6000
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Water heater (storage type)
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5000
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5000
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12V DC Battery Charger
|
120
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120
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Electric Motor Wattage
Electric
motors present a special problem.
They require up to three times
their rated wattage to start.
Example: an
electric motor name plate states 5 amps at 120 volts,
5 amps x 120 volts = 600 watts. Multiply this by 3.
This will show the starting watts needed. 600 watts x 3 = 1800 watts to
start
Some motor nameplates will show starting watts higher,
in some case 9 times higher, check the nameplate.
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Approximate
Starting Wattage*
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Motor
Horsepower
Rating
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Approximate
Running
Watts
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Universal
Motors
(Small Appliances)
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Repulsion
Induction
Motors
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Capacitor
Motors
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Split
Phase
Motors
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1/8
|
275
|
400
|
600
|
850
|
1200
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1/4
|
400
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500
|
850
|
1050
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1700
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1/3
|
450
|
600
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975
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1350
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1950
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1/2
|
600
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750
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1300
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1800
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2600
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3/4
|
850
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1000
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1900
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2600
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N/A
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1
|
1000
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1250
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2300
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3000
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N/A
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1.5
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1600
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1750
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3200
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4200
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N/A
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2
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2000
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2350
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3900
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5100
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N/A
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3
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3000
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N/A
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5200
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6800
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N/A
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*
Always use starting watts, not
running watts, when figuring correct electrical load
N/A - Motors of higher
horsepower are not generally used
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