Wattage Estimation Guide

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Tip: Don't just add up the total wattage for everything you want to power.  See our section on power management to learn how to use a smaller generator to power more.

More help on determining your power needs

Home Applications

 

Approximate Starting Wattage
(what is this?)

Approximate Running Wattage
(what is this?)

240V required?

Refrigerator or Freezer (Energy Star)

1200

132-192

 

Microwave Oven

650 watts

1000

1000

 

800 watts

1300

1300

 

1000 watts

1500

1500

 

Incandescent Lights

as indicated on bulb (i.e. 60W)

as indicated on bulb (i.e 60W)

 

Furnace Fan, gas or fuel oil

 

1/8 Horsepower

500

300

Y

1/6 Horsepower

750

500

Y

1/4 Horsepower

1000

600

Y

1/3 Horsepower

1400

700

Y

1/2 Horsepower

2350

875

Y

Television

 

 

 

Tube type

300

300

 

Flat Screen (20”)

120

120

 

Flat Screen (46")

190

190

 

Coffee Maker (4 cup)

600

600

 

Dishwasher (Cool Dry)

540

216

 

Electric Fry Pan

1500

1500

 

Electric Range (8-inch element)

2100

2100

Y

Automatic Washer

1200

1200

 

Clothes Dryer (Electric)

6750

5400

Y

Radio

50 to 200

50 to 200

 

Sump Pump

 

1/3 Horsepower

1300

800

Y

1/2 Horsepower

2150

1050

Y

Window Air Conditioner (10,000 BTU)

2200

1500

Computer

Laptop

200-250

200-250

 

Desktop

600-800

600-800

 

Monitor (LCD style)

30

30

 

Printer

400-600

400-600

 

Hot Water Heater

4500

4500

Y

Garage Door Opener

1420

720

 

Recreational

Tip: Don't just add up the total wattage for everything you want to power. See our section on power management to learn how to use a smaller generator to power more.

More help on determining your power needs

Recreational Applications

 

Approximate Starting Wattage
(what is this?)

Approximate Running Wattage
(what is this?)

240V required?

Television

 

 

 

Tube type

300

300

 

Flat Screen

120

120

 

RV Air Conditioner

 

 

 

11000 BTU

1600 

1010 

 

13500 BTU

2800

1800

 

15000 BTU

 3300

 2000

 

RV Refrigerator

 600

180

 

Blender

850

400

 

Electric Grill (tabletop)

 1650

 1650

 

Slow Cooker

170-270

170-270

 

Hair Dryer (1600 watts)

1900

1800

 

Microwave Oven (650 watts)

1000

1000

 

Coffee Maker

600

600

 

Radiant Heater

1300

1300

 

Laptop computer

200-250

200-250

 

Satelite Receiver

 250

 250

 

Radio

50 to 200

50 to 200

 

Two-Way Radio

 

 

 

12A

360W

360W

 

23A

840W

840W

 

35A

960W

960W

 

Fan (portable)

120 

40

 

DVD Player

350

 350

 

Construction/Industrial

See the chart below to estimate your power needs.

Tip: Don't just add up the total wattage for everything you want to power.  See our section on power management to learn how to use a smaller generator to power more.

More help on determining your power needs

Contractor Applications

 

Approximate Starting Wattage
(what is this?)

Approximate Running Wattage
(what is this?)

Air Compressor

1/2 hp

1600

975

1 hp

4500

1600

Bench Grinder (8 in.)

2500

1400

Circular Saw (Heavy Duty, 7 1/4 in.)

2300

1400

Concrete Vibrator

1/2 hp

840 (avg)

840 (avg)

1 hp

1080 (avg)

1080 (avg)

2 hp

1560 (avg)

1560 (avg)

3 hp

2400 (avg)

2400 (avg)

Demolition hammer

1260 (avg.)

1260 (avg.)

Drain cleaner

250 (avg.)

250 (avg.)

Drills

3/8 inch, 4 amps

600

440

1/2 inch, 5.4 amps

900

600

Electric Chain Saw (14 inches, 2 hp)

1100

1100

Hand Drill (1/2 in.)

900

600

High-pressure Washer (1 hp)

3600

1200

Rotary hammer

1200 (avg.)

1200 (avg.)

Table Saw (10 in.)

4500

1800

 

 

 

Industrial Motors

 

 

Split Phase

1/8 Horsepower

1200

275

1/4 Horsepower

1700

400

1/3 Horsepower

1950

450

1/2 Horsepower

2600

600

Capacitor Start Induction Run

1/8 Horsepower

850

275

¼ Horsepower

1050

400

1/3 Horsepower

1350

450

½ Horsepower

1800

600

¾ Horsepower

2600

850

1 Horsepower

3000

1000

1 ½ Horsepower

4200

1600

2 Horsepower

5100

2000

3 Horsepower

6800

3000

4 Horsepower

9800

4800

Capacitor Start Capacitor Run

1/8 Horsepower

600

275

¼ Horsepower

850

400

1/3 Horsepower

975

450

½ Horsepower

1300

600

¾ Horsepower

1900

850

1 Horsepower

2300

1000

1-½ Horsepower

3200

1600

2 Horsepower

3900

2000

3 Horsepower

5200

3000

4 Horsepower

7500

4800

Fan Duty

1/4 Horsepower

1200

650

Farm Equipment

See the chart below to estimate your power needs.

Tip: Don't just add up the total wattage for everything you want to power.  See our section on power management to learn how to use a smaller generator to power more.

More help on determining your power needs

 

Approximate Starting Wattage
(what is this?)

Approximate Running Wattage
(what is this?)

Electric Fence, 25 miles

250

250

Milk Cooler

1800

1100

Milker (vacuum pump, 2hp)

2300

1000

Portable Heater (kerosene, diesel fuel)

50,000 BTU

600

400

90,000 BTU

725

500

150,000 BTU

1000

625

Battery Charger

15 amp

380

380

60 amp with 250-amp boost

1500/5750

1500/5750

Generators