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Powell's Sales & Service
1305 Justus Blvd.
Clarks Summit, Pa. 18411

Phone:   570-587-2743
TollFree 888-44powell
Fax        570-586-6553

Hours:
Mon.-Fri.  7:30 to 5:00
Sat.            7:30 to 4:30
Sunday       Closed


This page designed & maintained by
Michael Brelish.

Page was last edited
 03/29/2007 03:39:52 PM

Copyright 2007 ©
Michael Brelish.

All Rights Reserved.

 

 

 

 

 

 

 

 

 

 

 

         

Determining Electrical Load for Generator *

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 rated wattage of generator. For rated wattage of generator, see Specifications. Electric motors present a special problem when figuring load. Read Step 3 carefully.
  1. Make two list of items you want powered by generator. List all motors and motors 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. Entering running watts of each item except motors. The light bulb or appliance nameplate list is wattage. Remember, 1KW=1000 watts. Note: The nameplate may not list wattage. It may only list volts and amps.
    The formula for finding wattage is: Volts x Amps. = Watts. For example: An electrical 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 three-times their rated wattage to start. Chart 2 shows starting wattage for different motors. For example: an electric motor nameplates 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 need. 600 watts x 3 = 1800 watts to start. When figuring the generator load for motors, you must use the starting 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 below for typical appliance wattage examples.
  4. Add watts and starting watts of all items. This total must not be larger than the rated wattage of your generator. It is a good idea to have up to 25% extra capacity for future needs or extra equipment.

 

 

* Article from Master Generator web site.
Approximate Starting Watts* - CHART 2
Motor HP Rating
Approximate Running Watts
Universal Motors (Small Appliance)
Repulsion Induction Motors
Capacitor Motors
Split Phase 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
5100
x
3
3000
x
5200
6800
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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This page last updated 03/06/2007 03:32 PM .
This page designed and maintained by Michael Brelish.
Copyright 2005 © Michael Brelish. All rights reserved.