What size genset do I need?

I have 35 Electric Motors with 3-phase power, 400 Volts and 50 HZ. Total horsepower provided by motors is 1115 HP. Motors range in size from 30-50 HP with 30 of the motors being 30 HP. Each motor can be started independantly and does not need to be started all together, just one after another. What size Genset do I need?

Answer:
I am NOT a power plant engineer.

It would help to know the total load. Although there are 35 motors with a total HP rating of 1115 HP, what is the maxumum simultaneous HP required?

If you need the whole 1115 HP, then I would suggest a genset equal to the total HP required, + 15% of the total HP required. Also, check to be sure that the genset has peak reserve capacity to handle the starting loads (even though they are distributed in time). Be sure that each motor is equiped with an adequate contactor to handle the power switching and overload protection.

For a genset of this size (and cost), I would expect that the manufactures would be quite happy to give you detailed application engineering assistance.

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