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Generator Wattage Calculator


Depending on how you will use your generator, there are different categories to meet your needs. This can include recreation, home standby and construction. Honda also offers Inverter Generators. Inverter generators are smaller and lighter as power is created electronically and not through a conventional alternator. Inverter power offers the cleanest power output, ideal for sensitive electronic devices.

If you want a generator for home standby, for example, if you want to run your refrigerator, you’ll need at least 2500 watts or more. And if you want to use a transfer switch so that power can go directly into your home, you’ll want a generator with at least 3000 watts.

You’ll also need to consider the maximum and rated power of the generator. This is important depending on what items you want to run off of your generator. Items such as toaster, lamps, and coffee makers are resistive, or constant loads and their total load can be calculated at amps x 1. Items such as saws and drills are reactive loads and while the running load may be small, the starting load should be calculated at running amps x 3. Remember, after the intial start less power is required for actual operation.

Always remember that simple power management will allow a smaller generator to do a big job. Very seldom are all tools or appliances operating simultaneously. When calculating power requirements, consider the starting requirements are only for the initial start and then additional tools may be operated in addition.

Remember Ohm’s Law from High School Physics?
Watts = Volts x Amps
Amps = Watts/Volts

So if you have two of the numbers (e.g. volts, amps) then you can find out the other (e.g. watts). This can help you to determine the rated power that you’ll need from your generator.

AVERAGE WATTAGE REQUIREMENT GUIDE
(AMPS X VOLTS = WATTS)

Household
 
Approximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
Coffee Maker
 
600
 
600
 
Dishwasher
Cool Dry
540
 
216
 
Electric Fry Pan1500
 
1500
 
Electric Range
8-inch element
 
2100
 
2100
 
Microwave Oven 650 watts
 
1000
 
1000
 
Refrigerator or Freezer – Energy Star
 
1200
 
132-192
 
Automatic Washer
 
1200
 
1200
 
Clothes Dryer
Electric
6750
 
5400
 
Furnace Fan, gas or fuel oil
 
1/8 Horsepower500
 
300
 
1/6 Horsepower750
 
500
 
1/4 Horsepower1000
 
600
 
1/3 Horsepower1400
 
700
 
1/2 Horsepower2350
 
875
 
Incandescent Lightsas indicated on bulb
 
as indicated on bulb
 
Radio
 
50 to 20050 to 200
 
Sump Pump
 
1/3 Horsepower1300
 
800
 
1/2 Horsepower2150
 
1050
 
Television - Color 300
 
300
 
Air Conditioner
10,000 BTU
2200
 
1500
 
Contractor
 
Approximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
Air Compressor
1 Horsepower
4500
 
1600
 
Bench Grinder
8 inches
 
2500
 
1400
 
Hand Drill
1/2 inch
 
900
 
600
 
High-pressure Washer
1 Horsepower
 
3600
 
1200
 
Circular Saw, Heavy Duty
71/4 inches
2300
 
1400
 
Electric Chain Saw
14 inches, 2 Horsepower
1100
 
1100
 
Table Saw
10 inches
4500
 
1800
 
Drills
 
3/8 inch 4 amps 600
 
440
 
1/2 inch 5.4 amps900
 
600
 
Industrial Motors
 
Approximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
Split Phase
 
1/4 Horsepower1700
 
400
 
1/2 Horsepower2600
 
600
 
Capacitor Start Induction Run
 
1/3 Horsepower975
 
450
 
1 Horsepower2300
 
1000
 
Capacitor Start Capacitor Run
 
1 1/2 Horsepower 4200
 
1600
 
Fan Duty
 
1/4 Horsepower1200
 
650
 
Farm Equipment
 
Approximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
Electric Fence, 25 miles 250
 
250
 
Milk Cooler 1800
 
1100
 
Milker (vacuum pump),
2 Horsepower
2300
 
1000
 
Portable Heater (kerosene, diesel fuel)
 
50,000 BTU 600
 
400
 
90,000 BTU725
 
500
 
150,000 BTU1000
 
625
 
Battery Charger
 
15 amp380380
 
60 amp with 250-amp boost
 
1500/57501500/5750
 
100 amp with 300-amp boost
 
2400/7800
 
2400/7800
 
Electric Welder
 
200 amp AC 90009000
 
230 amp AC, at 100 amp78007800
 
Air CompressorsApproximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
1/2 Horsepower1600 975
 
1 Horsepower 45001600
 

Computers
 
Approximate
Wattage Required
For Starting
Approximage
Running Wattage
Requirements
Desktop 600 to 800600 to 800
 
Laptop 200 to 250200 to 250
 
Monitor (CRT) 200 to 250200 to 250
 
Fax 600 to 800600 to 800
 
Printer400 to 600400 to 600
 


 


 

 

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Privacy Policy
(c) 2011 Robinsons Hardware - All Rights Reserved
Photos are for illustrative purposes only and may not represent actual products.
This website does not constitute an offer to sell or rent any item at a specific price.
Prices and specifications are subject to change without notice.  Pricing was accurate as of 10/01/10
Pricing on this website may be out-of-date with prices in the store and store pricing takes precedent.

 

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