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Battery size help

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Battery size help

Home › Forums › Beginners › Battery size help

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  • 23 March 2010 at 14:05 #26039
    Queequeg Quint
    Participant
      @queequegquint38270
      My boat is about 35 inches long, 11 inches wide, Novi lobster boat hull.  Motor is MFA Como 800, direct driving a 55mm 4-blade brass prop.  I’ve run her hooked up to a 12-volt battery and she ran great for a long time.  But….

       
      The battery I’m using is 10AH, therefore it weighs about 10lbs.  Way too heavy for my boat.  Before I start buying other batteries, what do you guys reccommend for a battery.  I really want a looooonnnnnngggggg run-time so that’s why I opted for 10AH, but it’s just too heavy.
       
      Your thoughts?
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      23 March 2010 at 14:05 #1951
      Queequeg Quint
      Participant
        @queequegquint38270
        23 March 2010 at 14:36 #26041
        Dave Milbourn
        Participant
          @davemilbourn48782
          A 12v 10AH gel cell weights around 3 kg. A 10-cell D-Size NiMH 9AH pack weighs 2.1Kg. Price is £72.50. Two 12v 4600maH Sub-C packs would cost about the same but weigh only about 1.3Kg together. A 3C LiPo pack (11.1v) weighs only 350g, but it only holds 4AH. It also costs £54. All prices and weights c/o Component Shop’s website.
          I would think about changing the motor for a smaller, lower-current one running through a belt-drive or gearbox. That way you’ll be able to use a smaller SLA battery and still have the same running time.
          DM
          23 March 2010 at 17:45 #26045
          ashley needham
          Participant
            @ashleyneedham69188
            Q.  Depends how much weight you need to lose!
             
            I would just change it to a 7Ahr 12v gel battery as easiest method, personally.
             
            Should run for a fair old while (lasts ok on the Seahawk with a single 850).
             
            HOWEVER, if thats not enough weight saving you will have to go NiMh, as suggested.
             
            Do you have any other ballast barring the battery?
            Ashley
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