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directly hook an automotive Inverter to the Alternator?

Discussion in 'Electronic Design' started by Joseph, Dec 18, 2007.

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  1. Joseph

    Joseph Guest

    Is it possible to directly hook an automotive Inverter to the
    Alternator? thereby by-passing the 12V battery?
     
  2. Jim Thompson

    Jim Thompson Guest

    An automotive alternator is 3-phase rectified, thus will have a fair
    amount of ripple. Whether your inverter can cope will require a
    "smoke" test ;-)

    ...Jim Thompson
     

  3. Have you ever looked at the output of an unloaded alkternator on a
    scope?

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  4. Guest


    I thought the alternator is already connected to the 12V battery.

    Or did you mean, REMOVE the 12V battery?

    Michael
     
  5. PeterD

    PeterD Guest

    Also most alternator regulators are designed to 'charge' a batter, and
    expect that a battery is attached to the alternator. You may find
    regulation is poor, especially at light loads with no battery.

    What are you spinning the alternator with? Also, with no batery, you
    need a self exciting (single wire) alternator and IIRC these require a
    minimum RPM to activate, and that minimum speed is on the order of
    2500 RPM.


    For the ripple problem, I'd think a reasonable capacitor would help.
    Since inverters are basically SMPS I don't think they expect totally
    clean input voltage. but as Jim says: you can give it a test!
     
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