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Adding a third (34)House(34) battery-gctid817903

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    Adding a third (34)House(34) battery-gctid817903

    I know it has been discussed a lot and i did my research, however i am still not clear on the best way to achieve this:

    I have two battery system in my 2855. Its a standard one, with the 1/2/Both switch and came with two cranking batteries. It works fine.

    What I want is to add a large deep cycle battery to run my stereo and amp and possibly fridge. So if it dies it dies, i don't care, i will charge it once back at the dock.

    Also, every time i anchor, i don't want to go in the bilge to switch between the batteries as well. Also i like the idea of two cranking batteries, just in case.

    Also when i am on the go , it would be nice if it would be charging if i am listening to music.

    So i can actually connect fridge, amp and a stereo to it, question is where do i connect the battery to charge when on the go and in the dock since the system is designed for two batteries.

    I would really appreciate the advise on it.
    1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

    #2
    2 separate starting bank plus new house bank is a bit overkill for a single screw boat IMO...2nd house bank can be used as a back up starting bank.

    I would add an ACR then possibly add a 2nd MBSS so you don't have to switch them frequently.
    Joon, Kathy, Jaden & Tristan
    Uniflite 42 AC, DD 671N
    93 3058 sold
    92 2855 (day boat)
    91 Fourwinns 205 (lake boat)
    Longbranch WA
    Life is Good

    Comment


      #3
      I don't know what ACR or MBSS means

      So the idea is to replace one of the batteries with the deep cycle? But how do i separate them then so one only starts the engine, but the other supplies the power to all the electrical ( stereo, fridge) without constantly going to the bilge?
      1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

      Comment


        #4
        It just seems easy and natural to simply add another battery on another side, wire the amp and fridge to it and that is it.

        The only question is charging it
        1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

        Comment


          #5
          ACR = automatic charging relay

          MBSS = main battery select switch

          replace your 2nd starting bank with a deep cycle battery(s), wire the amp and fridge to that house bank,

          ACR will charge both banks automatically,

          1 more MBSS on the house bank side...this way both banks would be isolated, but only combined when switched to ALL.
          Joon, Kathy, Jaden & Tristan
          Uniflite 42 AC, DD 671N
          93 3058 sold
          92 2855 (day boat)
          91 Fourwinns 205 (lake boat)
          Longbranch WA
          Life is Good

          Comment


            #6
            ACR = automatic charging relay

            MBSS = main battery select switch

            replace your 2nd starting bank with a deep cycle battery(s), wire the amp and fridge to that house bank,

            ACR will charge both banks automatically,

            1 more MBSS on the house bank side...this way both banks would be isolated, but only combined when switched to ALL.
            Joon, Kathy, Jaden & Tristan
            Uniflite 42 AC, DD 671N
            93 3058 sold
            92 2855 (day boat)
            91 Fourwinns 205 (lake boat)
            Longbranch WA
            Life is Good

            Comment


              #7
              Thanks, but i was thinking just add another battery and leave everything the way it is. All i want is the third battery to be charged with other two. So if the house battery dies, everything else, windlass etc functions just like it does now.

              Also, would deep cycle battery provide longer life running the stereo system and the fridge as well? opposed to the regular one
              1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

              Comment


                #8
                By the looks of it, Yandina Combiner should do the job

                http://www.defender.com/product.jsp?...9976&id=605576
                1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

                Comment


                  #9
                  I have plans to do this to my 2855, I hate every time I start the boat all my electronics recycle, but the way everything is wired through the wiring harness you can't easily separate them. I talked a tech at bluesea.com about this product

                  https://www.bluesea.com/products/764...tery_Kit_-_65A.

                  He told me the best solution would be to replace the MBSS with this system, then connect the current "A" side to the starter side, the current "B" side to the house side of the bluesea system and run a new wire to a new fuse box under the helm and move what you want to the new fuse box.

                  Then when you get on the boat you turn the switch to "on" and all charging is automatic. Turn the switch off when you leave.

                  It still has a way to connect both banks in case you need too.

                  Lee
                  Lee
                  Albermarle Sound, NC
                  1996 Ciera 2855
                  7.4 Merc Bravo 3
                  MMSI 338223458

                  Comment


                    #10
                    I'd second the recommendation for getting an Automatic Charge Relay. Wire all your house and electronics to your house battery system. Personally I'd go with 2-4 6V golf cart batteries but if you already have a 12V deep cycle, you can still use that and add another if you wish. Simply make your house system into one large battery bank rather than 2 house systems.

                    The ACR will combine both your House and Start batteries when there is a charging source present on either (engine running, plugged in, solar etc...). It automatically disconnects the two systems when charging stops, and will not combine them if the batteries are below 10.5V or have an issue.

                    These systems will extend the life of your batteries and completely removed the need to manually switch between house and start systems. I've installed them on my last 3 boats and would never be without one -- it's the first thing I did when I purchased the new boat.
                    Terry
                    1999 Bayliner 3388
                    Twin Cummins 4BTA
                    Fisherman, Cruiser, Boaticus-enthusiasticus-maximus
                    Member Royal Victoria Yacht Club

                    Comment


                      #11
                      Which ACR would you reccomend and what is the advantage of multiple golf batteries over a single 12v?

                      I think 2 battery system sounds good.
                      1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

                      Comment


                        #12
                        Hyper, battery combiner isolator , ACR would do the job.

                        now we are talking 3 banks with only 1 MBSS...this would require a 3 bank smart charger, no crossover between bank 1,2 and bank 3.

                        my suggestion was only for how I would have done in my 2855.

                        True deep cycle battery will last much longer... golf cart 6V, L16s

                        Lee, what they suggested would also work, you would have to switch your MBSS all the time unless you want to leave it at ALL draining bank 1 & bank 2 together while on the hook.
                        Joon, Kathy, Jaden & Tristan
                        Uniflite 42 AC, DD 671N
                        93 3058 sold
                        92 2855 (day boat)
                        91 Fourwinns 205 (lake boat)
                        Longbranch WA
                        Life is Good

                        Comment


                          #13
                          Ok. I think im starting to get the idea. I dont have to do 3 batteries, 2 should suffice. What i understand , the easiest is ACR , move all the electrical to deep cycle and that is it.

                          Questions is. Lets say i am coming back with the fully discharged house battery, but cranking one is pretty much full. Will the ACR keep charging a full battery as well until the house battery is fully charged?
                          1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

                          Comment


                            #14
                            yes.

                            you do not want to fully discharge a deep cycle batt...don't discharge below 50%.

                            good idea to purchase a batt voltage indicator.
                            Joon, Kathy, Jaden & Tristan
                            Uniflite 42 AC, DD 671N
                            93 3058 sold
                            92 2855 (day boat)
                            91 Fourwinns 205 (lake boat)
                            Longbranch WA
                            Life is Good

                            Comment


                              #15
                              It is never an easy way, lol

                              I guess i will get a deep cycle battery for now and go from there
                              1998 Ciera 2855, 7.4L MPI, Harbourfront Toronto, Ontario

                              Comment

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