Generator Sizing
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 |
|
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| 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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