sizing a generator

Discussion in 'OnBoard Electronics & Controls' started by nevilleh, Nov 10, 2014.

  1. nevilleh
    Joined: Sep 2008
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    Location: scotland

    nevilleh Junior Member

    Hi, We are upgrading our generator (ac 3 phase). However it is 110 KW and we wish to use a bow thruster (start delta starting) which has a motor of 80 kw.

    Do you think that the generator will handle the start up current ?


    Thanks
    Neville
     
  2. NavalSArtichoke
    Joined: Oct 2013
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    NavalSArtichoke Senior Member

    Who knows? That's why God created electrical engineers.
     
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    If the motor is 80Kw maximum power, yes. Otherwise, the specifications will tell you what the required starting power is. Also, check what the continuous rating for the generator is.
     
  4. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    The thruster's fuse recommendation is one clue. Different gensets have widely varying abilities to surge on starting loads and the rest of your electrical system will need to be tolerant of the fluctuations. Soft starters would be one option.
     
  5. parkland
    Joined: Jul 2012
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    parkland Senior Member

    I would think a good thing to know is how much power is being drawn off the generator right now, so when the new generator goes in, you know how much can be dedicated to the thruster.

    That being said, to this day nobody has ever paid for my opinion.
    I can tell you that we use larger generators than that at work, and a 30 hp electric motor will cause a surge and bog down for a split second while they start.
     

  6. rxcomposite
    Joined: Jan 2005
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    Location: Philippines

    rxcomposite Senior Member

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