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Only getting 8 volts DC on generator

Post in 'DIY and General non-hearth advice' started by Bad Wolf, Jul 14, 2013.

  1. Bad Wolf

    Bad Wolf Minister of Fire

    Joined:
    Jun 13, 2008
    Messages:
    507
    Loc:
    Eastern CT
    Getting ready for hurricane season and I'm doing my monthly generator check. The generator (Troy-bilt 11,000/7550 watt) is producing AC just fine. It ran things during the last two hurricanes without a problem 120/240 volts and 60Hz. I went to check the 12VDC output for battery charging and its only 8.5 volts. Its not a real big deal, I keep a trickle charger on it to keep the starting battery up, and I can't really see needing to charge batteries from the generator, I just like things to work the way they are supposed to.

    Any ideas on why I'm getting low dc output?

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  2. MasterMech

    MasterMech Guest

    How does the DC system work? Is there a rectifier/regulator hooked into the main AC alternator output or is it a totally separate setup coming from the engine flywheel/stator?
  3. Bad Wolf

    Bad Wolf Minister of Fire

    Joined:
    Jun 13, 2008
    Messages:
    507
    Loc:
    Eastern CT
    It looks like there are two "battery Charge rectifiers" coming off the stator. One goes to the starter battery, the other to the 12vdc output for other battery charging. I haven't checked the starter battery charging side.
  4. MasterMech

    MasterMech Guest

    The next question is then, does each rectifier get fed from a separate winding?
  5. seige101

    seige101 Minister of Fire

    Joined:
    Mar 25, 2008
    Messages:
    553
    Loc:
    Palmer, MA
    Does your generator idle down or have an eco setting?

    If it does it will only put out full dc voltage at full throttle.

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