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12V heater

Discussion in 'Electronics Q&A' started by Pirate Lady, Sep 22, 2020.

  1. Pirate Lady

    Pirate Lady Active Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    1991 250 Sundancer & Goplus 7.5' / 2.6hp outboard.
    Previous: 180BR, 220DA, 268DA, 250DA, 268DA
    7.4 Bravo 1
    Fall here. Anchor out. Have 2 deep cycle batts. Anybody know a heater to take off morning chill when we wake up? Amazon only got AC heaters.
  2. bobeast

    bobeast Dance the Tide SILVER Sponsor

    Oct 22, 2017
    Isleton, CA
    2002 310DA
    350 MPI w/V-drives
    Last edited: Sep 22, 2020
  3. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    I use that one to keep warm when working in the boat during the winter when it is blocked up out of the water. It does a decent job of keeping the chill away if I keep it close.
  4. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Dickson, TN / Chattanooga, TN
    1998 290 Sundancer
    Twin EFI 5.0L w/Alphas
    Kohler 4kW
    Could always just get one of those DC/AC converters .... properly sized it should be able to operate a small heater.
  5. markrsimon

    markrsimon Active Member

    Sep 1, 2018
    Cleveland, OH
    92 Sea Ray 400 Express
    454 Mercruiser
    While potentially possible - running a 110v heater off of an inverter would take a decent sized (expensive) inverter and would require alot of your battery bank. Then you have the step of recharging your battery bank as well. We could run the numbers but propane would be a better choice.

    An additional note about propane - When you heat with it, it does release a fair amount of water vapor which will start to condense on cold surfaces (windows, hatches). Might be good to have a few towels the first time around, and/or the ability to help vent the cabin afterwards. Granted, depends on how long you run the heater.

  6. Kevin P Winters

    Kevin P Winters New Member

    Jul 6, 2020
    Easton, Ma
    1987 Pachanga 19
    5.7 mercruiser
    I would think a small propane solution would be the best plan. 12V does not have a great deal of heating capability.
    a typical 1500W heater will draw ~ 12-14 Amps off 120V. Doing the math the same heater at 12V will draw over 120 amps. You may find a hand warmer or small 100W unit but it will not warm much.
  7. northern

    northern Well-Known Member

    Jan 17, 2007
    Anacortes Washington
    380 Aft Cabin 1989 Charts Timezero radar Furuno
    Twin 454 strait shaft
    I got a 12 volt coffee maker for the jetboat. It took 30 minutes to get hot water and the cigarette lighter got hot. The fuse blew in the coffee heater once. I watched a Utube on Mr Heater where a real fire department monitored the heater for one complete 1# burn in a 100% closed RV and the gas level were zero all the time. Only problem seems to be they produce humidity. I am going to get one now.

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