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Small super high capacity battery??

Discussion in 'Beginner Electronics' started by hdjim69, Jan 14, 2008.

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  1. hdjim69

    hdjim69 Guest

    Hello, I have a 12v dc space heater that I use in my truck when I go
    on trips. I only use it during the night (average about 6 hrs per 24
    hr period). The heater is 300w. I have it hooked up to a separate
    sealed12v car battery which means it's drawing 25 amps! This sucks
    the battery dead in no time and it's very hard to find a place to
    recharge the battery all the time. Does anyone know of a super high
    capacity 12v battery that would be better suited for such current
    demands? Or a better solution? Motels are out of the question.

  2. Baron

    Baron Guest

    Don't you recharge it from the truck system ?
    You need to get a "Leisure Battery"  this is a secondary battery used in
    campers/caravans to supply power.  Mine is rated 185 Ah and lasts about
    12 hours from full charge, but not at 25 amps !  My average draw is
    only about half that.  Though the fridge takes a constant 7 amps.
    You can get much bigger ones.  I've seen 330 Ah for sale.
  3. default

    default Guest

    How about a small catalytic radiant heater running from a propane
  4. default

    default Guest

    Better idea - adapt a Aladdin kerosene mantle lamp as a heater? I did
    that a long time ago as a greenhouse heater - just to keep plants from
    freezing at night. I only used the "gallery" and wick with a 3 foot
    piece of 1-1/2" thin wall conduit as a chimney. Only cost was a new
    wick once a season - I didn't use the mantle the flame burns blue and
    it doesn't need venting - produces CO2.

    More efficient than burning fuel to make heat to make electricity to
    make heat - smaller, lighter and cheaper than a battery. One Aladdin
    lamp puts out up to 2,000 BTU's (and the equivalent of 75 watts of

    300 watts is about 1,000 BTU. A quart of oil is good for more than 6
    hours at the highest setting.
  5. default

    default Guest

    True. Un vented heaters, as a rule, produce far more heat than the
    Oxygen consumed so the amount of venting is minimal, the heat would be
    uncomfortable before breathing suffered - but in something like a
    truck body that is well sealed it would be something to watch.

    It wouldn't do to fall asleep without a vent.

    I'd crack open a foot vent and leave one window cracked 1/2" or so.
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