PORTABLE GENERATORS
To determine kilowatts (kW), use the following formula: 1000 Watts = 1 Kilowatt (Ex. 1500 Watts/100 watts - 1/4 kW)
Charts 1, 2 and 3 will help you select the proper size generator. If watts and/or amps are not given and only the horsepower is shown, use Chart 3 to determine the starting and running watts. Chart 4 is a guide for selecting the proper size of insulated copper wire when extensions cords are used. We recommend the use of outdoor-rated (UL) cable, recognized type SJTW-A.
CHART 3: MOTOR STARTING REQUIREMENTS
WATTS REQUIRED TO START MOTOR
MOTOR (HP)
RUNNING WATTS
REPULSION INDUCTION CAPACITOR
SPLIT PHASE
1/8 1/6 1/4 1/3 1/2 3/4
275 275 400 450 600 850
600 600 850 975
850 850
1200 2050 2400 2700 3600
1050 1350 1800 2600 3300
1300 1900 2500
– –
1
1100
CHART 4: INSULATED COPPER WIRE SIZE
LOAD IN WATTS
CURRENT IN AMPS
#4 WIRE
#6 WIRE
#8 WIRE
#10 WIRE
#12 WIRE
#14 WIRE
#16 WIRE
#18 WIRE
@ 120V
@ 240V
2.5 5.0
300 600 – – – 1000 600 375 250 150 600 1200 – – – 500 300 200 125 75
7.5 900 1800 – – – 330 200 125 80 50 10.0 1200 2400 – 625 400 250 150 100 50 35 15.0 1800 3600 650 400 265 165 100 50 – – 20.0 2400 4800 500 300 200 125 80 – – – 25.0 3000 6000 400 250 150 100 – – – – 30.0 3600 7200 325 200 125 – – – – – 35.0 4200 8400 275 175 100 – – – – – 40.0 4800 9600 250 150 – – – – – – 45.0 5400 10800 225 – – – – – – – 50.0 6000 12000 200 – – – – – – –
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