This question-and-answer article outlines how to use
manufacturer ratings for generators to choose the proper
equipment for the job. Also covered: How to consider conditions
that could "de-rate" the generator. By Amara Rozgus, Editor in
Chief Our Roundtable Participants (from left) - Brian Artzer,
Vice President, Henderson Engineers Inc., Lenexa, Kansas - David
J. Courtemanche, PE, Principal, X-nth, Boston - Rosa Lazebnik,
PE, Electrical Technology Manager, Primera, Chicago - Mak
Wagner, PE, Associate Chief Electrical Engineer, Stanley
Consultants, Muscatine, Iowa CSE: What are the critical
parameters for generator ratings? David Courtemanche: The
critical parameters for sizing a generator all start with the
load to be served. These parameters include: the size of the
load in kW and kVA; the maximum allowable voltage and frequency
dips that the load can withstand; the type of load, such as
motors, lighting, UPS, VFD, etc.; the character of the service
expected of the generator, meaning is this a standby power