When buying deep cycle batterys for camper

Discussion in 'Electrical and Ignition' started by MileHighDart, Aug 11, 2018.

  1. MileHighDart

    MileHighDart FABO Gold Member FABO Gold Member

    Messages:
    2,791
    Likes Received:
    1284
    Joined:
    Jun 3, 2004
    Location:
    Lyons, CO
    Local Time:
    11:09 PM
    what should I be looking for, Cold cranking amps, or amp hours?

    Just wondering what will last the longest is a camper application, group 24 size deep cycle.

    Any ideas how to compare different ones?
     
  2. RustyRatRod

    RustyRatRod Just another dumbass. Technical Editor

    Messages:
    46,202
    Likes Received:
    10569
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    View My Photos
    Local Time:
    6:09 PM
    Reserve Capacity and physical size. Reserve capacity is the amount of time a fully charged battery can deliver 25 amps at 80*F before reaching 10.5 volts. When looking for deep cycle batteries, that's the number to compare. The physical size with batteries is also a player. The bigger the battery, the more plates it has, the bigger the plates are and the more electrolyte it holds. If my customers have the room, the one I usually try to sell is the group 31. Usually the 31-5. If I remember right, their reserve capacity is 185 minutes. That's a ton. That's what you're looking for. Remember, don't compare CCA, because a deep cycle battery will have a lower CCA than standard automotive batteries by design. It's the reserve capacity that's important.
     
    • Thanks! Thanks! x 1
    • Agree Agree x 1
    • MileHighDart

      MileHighDart FABO Gold Member FABO Gold Member

      Messages:
      2,791
      Likes Received:
      1284
      Joined:
      Jun 3, 2004
      Location:
      Lyons, CO
      Local Time:
      11:09 PM
      Thanks Rusty, that's exactly the kind of info I needed. Pretty sure I have to stick with the group 24, unless I buy bigger battery boxes, and modify the mount to make room. Its a dual battery system.
       
    • 67Dart273

      67Dart273 Well-Known Member

      Messages:
      37,538
      Likes Received:
      5238
      Joined:
      Oct 14, 2010
      Location:
      Idaho
      View My Photos
      Local Time:
      3:09 PM
      Ignore CCA and don't buy automotive starting batteries. Buy what are labeled as deep cycle. Amp hour ratings are fine if they are honest. The quick and dirty is the WEIGHT OF THE BATTERY and the reputation of the supplier
       
    • pishta

      pishta I know I'm right....

      Messages:
      12,937
      Likes Received:
      2817
      Joined:
      Oct 13, 2004
      Location:
      Tustin, CA
      View My Photos
      Local Time:
      3:09 PM
      Are deep cycle batteries also built differently? I heard if you kill a car battery it wont come back up 100% even after a slow charge. It takes a 10% capacity damage hit every time..?
      Just get a few of these GR-45's: 3900 amp/hours a piece. You can go off the grid for a month. Of course youll need another trailer to haul them....see credit card for size comparison
      20180811_095944.jpg
       
    • RustyRatRod

      RustyRatRod Just another dumbass. Technical Editor

      Messages:
      46,202
      Likes Received:
      10569
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      View My Photos
      Local Time:
      6:09 PM
      Look at part number 24DCM from O'Reilly. That's the group 24 style deep cycle marine battery. O'Reilly batteries are made by two companies, both of which are in USA. One is East Penn Battery and the other is Johnson Controls, which makes the Interstate batteries. East Penn has been making Deka batteries since the turn of the 20th century. The group 24 marine style battery from O'Reilly is also not maintenance free, which means you can add water and electrolyte to it as need. I cannot stand maintenance free batteries. That's usually what kills them. They dry out.
       
      • Agree Agree x 1
      • Tooljunkie

        Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

        Messages:
        5,733
        Likes Received:
        4232
        Joined:
        Jul 22, 2017
        Location:
        Manitoba
        Local Time:
        5:09 PM
        I sold deka for years.
        Very good batteries.
        Deep cycle will withstand deep discharge/recharge where a cranking battery will not put up with it as well.
        Group 27 batteries are just a little larger,may want to measure battery box.
         
      • RustyRatRod

        RustyRatRod Just another dumbass. Technical Editor

        Messages:
        46,202
        Likes Received:
        10569
        Joined:
        Jun 7, 2010
        Location:
        Georgia
        View My Photos
        Local Time:
        6:09 PM
        Yup. Sometimes the 27DCM will fit where the 24DCM will. It just depends on whether there's any extra room in the box.
         
      • TrailBeast

        TrailBeast Slightly Twisted Member

        Messages:
        18,741
        Likes Received:
        4894
        Joined:
        Mar 11, 2011
        Location:
        Arizona
        View My Photos
        Local Time:
        3:09 PM
        Don't even bother with 12v deep cycles for an RV.
        Take it frome someone with years of RV experience and get yourself 2 6v Golf cart batteries.
        Those 2 sixes will outlast 2 12's by almost 4 times.
        A nice solar powered charger/maintenance system is a killer addition, because it helps bring batteries back up in the daytime.

        Here's a bit of proof in case you need it.:D
        6 volt or 12 volt batteries for rv - Google Search
         
        • Like Like x 1
        • Agree Agree x 1
        • RustyRatRod

          RustyRatRod Just another dumbass. Technical Editor

          Messages:
          46,202
          Likes Received:
          10569
          Joined:
          Jun 7, 2010
          Location:
          Georgia
          View My Photos
          Local Time:
          6:09 PM
          Then get two of the GC110DT six volters from O'Reilly. lol
           
        • 67Dart273

          67Dart273 Well-Known Member

          Messages:
          37,538
          Likes Received:
          5238
          Joined:
          Oct 14, 2010
          Location:
          Idaho
          View My Photos
          Local Time:
          3:09 PM
          I've never been a fan of batteries in parallel. I'd lean towards a pair of 6's
           
        • TrailBeast

          TrailBeast Slightly Twisted Member

          Messages:
          18,741
          Likes Received:
          4894
          Joined:
          Mar 11, 2011
          Location:
          Arizona
          View My Photos
          Local Time:
          3:09 PM
          From where? :D
           
          • Like Like x 1
          • Abodybomber

            Abodybomber Breaking street machines , since 1983.....:)

            Messages:
            31,715
            Likes Received:
            10056
            Joined:
            May 21, 2011
            Location:
            Arroyo grande ca
            Local Time:
            3:09 PM
            A good knowledgeable parts man ,can save many customer headaches. Kudos ,Mr. Merritt.
             
            • Agree Agree x 2
            • YY1

              YY1 Well-Known Member

              Messages:
              5,056
              Likes Received:
              801
              Joined:
              Oct 11, 2011
              Location:
              FL
              Local Time:
              6:09 PM
              I've been using Exide RV deep cycle/starting batteries in both my 73 and my 2000 Dakota.

              Oldest one is 2012, newest is 2016.

              No problems.

              Hot cranking comes into play in FL.

              I stumbled on this idea by accident when the batt in my 73 gave it up in the parking lot of Dick's sporting goods, and that was what they had.

              I don't think I'll ever go back to a regular "car" battery.

              If you have a Rural King, they sell Exide batteries branded "RK" and a 625 CCA group 24 Deep/starting can be had for $45 occasionally.
               
            • 1969383S

              1969383S FABO Gold Member FABO Gold Member

              Messages:
              3,572
              Likes Received:
              1099
              Joined:
              Jan 8, 2012
              Location:
              Cumming, GA.
              View My Photos
              Local Time:
              6:09 PM
              Agree if you have the room to mount and vent them!