Generator Sizing

Generator Sizing for single and three phase loads, welder generators, standby generators, as well as motor starting.
  

Single/3 Phase Welder Generators Motor Starting
 
Try our Power Calculators for quick conversions and formulas
 
  Amps Single Phase Amps Three Phase
Generator Fuel Size 1 Wire 4 Wire ZigZag      
kW kVA 120V 240V 120V 240V 120V 240V 208V 240V 480V
Portable Generator GA-2.5H Gas 2.5 18.3
Portable Generator GA-3.6HB Gas 3.6 26.6 13.3
Portable Generator TPG-6000H-DX Gas 6 39.2 19.6
Portable Generator DL6000I Gas 6 22.9
Portable Generator HPS6000HE Gas,LP,NG 6 45.8 22.9
Portable Generator GA-6HB Gas 6 41.6 20.8
Portable Generator GA-6HEB Gas 6 41.6 20.8
Portable Generator HPS9000VE Gas,LP,NG 9 66.7 33.3
Portable Generator GA-9.7HEA Gas 9.7 70 35
Portable Generator HPS12000HE Gas,LP,NG 12 45
Diesel Generator DA-7000SSA1 Diesel (Tier 4) 7 50 25
Diesel Generator DCA-10SPXU4C Diesel (Tier 4) 11 41.7 41.7
Diesel Generator TLG-12SPX4C Diesel (Tier 4) 13 50 50
Diesel Generator DCA-15SPXU4C Diesel (Tier 4) 16.5 65.5 62.5
Diesel Generator DCA-20SPXU2 Diesel (Tier 4) 22 83 83
Diesel Generator DCA-36SPXU2 Diesel (Tier 4) 37.8 150 150
Diesel Generator DCA-56SPXU2 Diesel (Tier 3) 58.8 233 233
Diesel Generator DCA-25SSIU3C Diesel (Tier 4) 22 25 60 55.5 27.8 60 60 30
Diesel Generator DCA-45SSIU4C Diesel (Tier 4) 37 45 108 100 50 108 108 54
Diesel Generator DCA-70SSIU2C Diesel (Tier 3) 59 70 168 155.5 77.8 168 168 84
Diesel Generator DCA-125SSIUC Diesel (Tier 3) 110 125 301 277.8 138.9 301 150 180
Diesel Generator DCA-150SSCU4i Diesel (Tier 4) 132 150 361 333.3 166.7 361 361 180
Diesel Generator DCA-180SSCU4i Diesel (Tier 4) 158 180 400 200 433 216
Diesel Generator DCA-220SSCU4i Diesel (Tier 4) 194 220 488.9 244.4 529 265
Diesel Generator DCA-300SSCU4i Diesel (Tier 4) 264 300 666.7 333.3 722 361
Diesel Generator DCA-600SSVC Diesel (Tier 2) 528 600 1333.3 666.7 14,43 721
Diesel Generator DCA-800SSK2C Diesel (Tier 2) 704 800 1777.8 888.9 1924 962
Ultra Silent Generator DCA-25USI2C Diesel (Tier 4) 22 25 55.6 27.8 60 60 30
Ultra Silent Generator DCA-45USI2C Diesel (Tier 4) 37 45 100 50 108 108 54
Ultra Silent Generator DCA-70USI2C Diesel (Tier 3) 59 70 155.5 77.8 168 168 84
Ultra Silent Generator DCA-85USJ2C Diesel (Tier 3) 70 88 183.3 91.6 250 197 99
Ultra Silent Generator DCA-125USIC Diesel (Tier 3) 110 125 277.8 138.9 301 301 150
kWkVA120V240V120V240V120V240V208V240V480V
GeneratorFuelSize1 Wire4 WireZigZag   
 Amps Single PhaseAmps Three Phase
 
Model #FuelkWGenerator AmpsWelder Amps
120V240V
Welder Generator BDW180MC 180
Welder Generator GAW135H Gas 1.5 15 135
Welder Generator GAW180HE Gas 3 25 180
Welder Generator SDW-225SSA Diesel 6 50 25 225
Welder Generator DLW-300ESA Diesel 10.5 87 44 300
Welder Generator DLW-400SSA Diesel 14 116 58 400 Dual
Welder Generator DAW-500SA Diesel 3 25 25 500
 

Motor Starting

Large motors require a much larger amount of electricity to get started than they need once they are running.  To determine this amount, find the HP of your electric motor below and locate the starting kVA's.

For multiple motors, If you are sizing a generator to start multiple motors you first need to know if all the motors are going to start at the same time or if they can be started one at a time. If they all need to start at the same time, you need to locate the starting kW or kVA for EACH motor and add them together.  The generator you need to get them all running MUST be this large.  If you can actually start these motors sequentially (one after another) you can save a lot of money.

For sequential starting take the largest motor first and determine what it takes to start it.  Then add the Running kVA of the largest motor to the starting kVA of the second motor, and determine what it takes to run the first and start the second. Continue this process until all motors are started.

 HP Running kW Running kVA kVA Start
1 1.06 1.5 13
2 2.0 2.7 19
3 2.9 3.7 25
5 4.6 6.3 35
7.5 7.0 9.3 48
10 904 12.3 62
15 13.7 17.4 88
20 17.4 21.6 112
25 22.0 26.2 139
30 25.5 31.1 166
 
HP Running kW Running kVA kVA Start
40 35.2 41.3 221
50 43.5 49.9 276
60 51.5 61.2 336
75 66.0 77.0 419
100 86.0 99.0 552
125 113.0 127.0 698
150 136.0 153.0 836
200 178.0 201.0 1110
       
       
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sales@jobsite-generators.com