Generator Sizing

Status
Not open for further replies.
A

adamscb

Senior Member
Location
USA
Occupation
EE
Forum,

We have a 300hp motor we're trying to get up and running using a generator. What size of generator should be rent?

I say we should get a 300kW, because 300hp ~ 225kW, then add another 75kW for the inrush. Thoughts?
 
adamscb said:
Forum,

We have a 300hp motor we're trying to get up and running using a generator. What size of generator should be rent?

I say we should get a 300kW, because 300hp ~ 225kW, then add another 75kW for the inrush. Thoughts?
Click to expand...

starting method?
you need to determine the motors starting kva
then find a generator, more precisely alternator, that can supply it
in my limited experience the gen is usually twice the motor load size
 
Planning on starting it across the line. I'll look up the code for kVA/hp and calculate the starting kVA
 
eric9822 said:
Inrush current is usually about 6-10 times motor FLC. I think a 75KW allowance is low.
Click to expand...

Except that if the generator voltage simply sags under heavy load instead of collapsing you have, in effect, reduced voltage starting for the motor That reduces the load requirement on the generator.
 
One cost effective way is look for a rental supplier who can supply a generator coupled to an engine of lower size. The point is engine size need not be as big as the alternator coupled to it and this would be economical for you to operate.
 
Status
Not open for further replies.
Top