Generator Power Guide

How Much Power do you need?

This is the typical questions that everyone asks at one point or another. Most consumers do not understand how to calculate this into their consideration for what size generator will best suite their needs properly. Lets step back to high school physics.

  • Watts = Volts x Amps
  • Amps = Watts/Volts

You also need to take into consideration that some household items such as your refrigerator or freezer take more wattage to start them and less to keep it running. For example a typical refrigerator takes only about 700 watts to run it (yes, a full size refer/fridge combo). However, each time the compressor cycles it takes approximately 2200 watts to start it. This is the surge wattage of the appliance. We have listed below some typical items with there approximate required wattage. Keep in mind that if it is not listed you can also resort to calculating the requirement by using: Watts = Voltage x Amperage.

Household
Items
Running

Wattage Requirements

Additional Wattage Required For Starting
Coffee
Maker
1750 0
Dishwasher
- Cool Dry
700 1400
Electric
Fry Pan
1300 0
Electric
Range – 8-inch element
2100 0
Microwave
Oven 625 watts
625 800
Refrigerator
or Freezer
700 2200
Automatic
Washer
1150 2300
Clothes
Dryer – Electric
5750 1800
1/8
Horsepower
300 500
1/6
Horsepower
500 750
1/4
Horsepower
600 1000
1/3
Horsepower
700 1400
1/2
Horsepower
875 2350
Lights as indicated
on bulb
0
Radio 50 to
200
0
Sump
Pump
1/3
Horsepower
800 1300
1/2
Horsepower
1050 2150
Television
- Color
300 0
Central
Air Conditioner

10,000 BTU

1500 2200
Contractor Running
Wattage Requirements
Additional Wattage Required For Starting
Air
Compressor – 1 Horsepower
1500 4500
Bench
Grinder – 8 inches
1400 2500
Hand
Drill – 1/2 inch
600 0
High-pressure
Washer – 1 Horsepower
1200 3600
Circular
Saw, Heavy Duty – 7-1/4 inches
1400 2300
Electric
Chain Saw – 14 inches, 2 Horsepower
1100 0
Table
Saw -10 inches
1800 4500
Drills
3/8
inch 4 amps
440 600
1/2
inch 5.4 amps
600 900
Industrial Motors Running

Wattage Requirements

Additional Wattage Required For Starting
1/4
Horsepower
600 1000
1/2
Horsepower
875 2300
Capacitor Start Induction Run
1/3
Horsepower
720 1300
1 Horsepower 1600 4500
Capacitor Start Capacitor Run
11/2
Horsepower
2000 6100
Fan
Duty
1/4
Horsepower
650 1200
Farm
Equipment
Running
Wattage Requirements
Additional Wattage Required For Starting
Electric
Fence, 25 miles
250 0
Milk
Cooler
1100 1800
Milker
(vacuum pump) – 2 Horsepower
1000 2300
50,000
BTU
400 600
90,000
BTU
500 725
150,000
BTU
625 1000
15 amp 380 0
60 amp
with 250-amp boost
1500/5750 0
100
amp with 300-amp boost
2400/7800 0
200
amp AC
9000 0
230
amp AC, at 100 amp
7800 0
Air
Compressors
Running

Wattage Requirements

Additional Wattage Required For Starting
1/2
Horsepower
975 1600
1 Horsepower 1600 4500
Computers Running

Wattage Requirements

Additional Wattage Required For Starting
Desktop 600
to 800
0
Laptop 200
to 250
0
Monitor 200
to 250
0
Fax 600
to 800
0
Printer 400
to 600
0
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