ECM

Engine-generators should be sized to handle the continuous kilowatt load to be supplied plus motor starting requirements and the generator losses at the number of kilowatts selected. If the acceptable level of momentary voltage dip is known, it is possible to select the size of an engine-generator so that it will be able to start given-sized motors without exceeding the specified voltage dip level. Discussion will include typical motor starting characteristics, voltage dip, NEMA Code Letters, types of alternators and their respective voltage regulation characteristics, load power factor, motor starting torque levels, and a rule-of-thumb guide for calculating motor starting effects.