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10 or 20 amp battery charger?

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    10 or 20 amp battery charger?

    I have been thinking about up grading my charger since I have up graded my house bank. I went from one 8D to 4 golf cart 6v batters. I have been looking at a Marinco Charge Pro ether a 2 bank 10 amp, or a 2 bank 20 amp charger. The golf cart batters are for the house and the start is one 8D. Which one do I need? Marinco Charge Pro

    Just love being on my 3870............Bill
    1985 3870
    Twin 130 Mits. not turbo charged
    Name of boat is "Plenty Of Fish"
    Live on board full time.
    North Myrtle Beach, SC

    #2
    20 AMP of course.
    Xantrex True charge 2 is probably the best out there.
    it can throw all of its rated amp to one bank if necessary.
    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
      You need a 2 bank, you have 2 different batteries.
      The battery charger needs to be able to charge 2 banks separately, not combined or one bank may over charge and ruin one battery bank..
      I bought 2 battery chargers for that reason, but I recently switched to all sealed same type batteries.
      I have one spare sealed battery under the forward bed switched off from the house and starting and a separate charger for emergency.
      I have 2 true chargers.
      Pat says: DO-IT-RIGHT THE FIRST TIME!

      Bayliner 3870 "ALASKA33)
      Twin 350 GM power
      Located in Seward, AK
      Retired marine surveyor

      Comment


        #4
        True charge 2 can be a 1 bank, 2 bank, 3 or more.
        all depends on how it is wired...
        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


          #5
          Originally posted by Ruffryder View Post
          True charge 2 can be a 1 bank, 2 bank, 3 or more.
          all depends on how it is wired...
          Are they separate charging banks or just charging all banks?
          I have the older yellow chargers.
          Pat says: DO-IT-RIGHT THE FIRST TIME!

          Bayliner 3870 "ALASKA33)
          Twin 350 GM power
          Located in Seward, AK
          Retired marine surveyor

          Comment


            #6
            Separate charging banks.
            Unlike most conventional charger with those pre made charging leads.
            True charge 2 is done inside the charger, hard wired as you make up.
            No devided charging rate AMP per bank...
            if your starting bank 1 is floating, it will send almost all of its available rated charging amp to the house bank 2.
            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
              Originally posted by Ruffryder View Post
              20 AMP of course.
              Xantrex True charge 2 is probably the best out there.
              it can throw all of its rated amp to one bank if necessary.
              +1 on the 20 amp
              Dave
              Edmonds, WA
              "THE FIX"
              '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
              (.030 over-Vortec top end-part closed cooled)
              The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
              Misc. projects thread
              https://www.baylinerownersclub.org/f...56-gctid789773

              Comment


                #8
                The original charger on my 3870 was 40 amp.
                I installed a Promariner Pronautic 1250. This unit will put out 50amps to one bank or divide the current between two or three banks. It has multiple charging states and can also desulfate your batteries. It has been a great addition. I have (2) 8D’s and a group 27 for the genny.
                Gibraltar, Mi.
                1986- 3870- Hino 175's - Just purchased May ,2017
                34' Tollycraft- sold
                88 26' Shamrock/ Diesel
                14' Zodiac Bay Runner

                Comment


                  #9
                  If your going to spend a lot of time on the hook you want a larger charger than 20 amp or you will be running your genny a lot. Depending on what you are running, you could use up to 200 amp hours a day. Or even more. TV for example can by your biggest battery drain. If you have your original frige it can draw about 9 pam hours when running. Outside temps will determine how long it runs but in hot weather it can run all the time. Newer ones will use much less amp hours.
                  You can do the math.
                  Personally I have a 100 amp charger. It, like any charger will not charge its max for very long but it isn't to big either. We live on the hook for the entire season. Its an inverter/charger.
                  Doug
                  Started boating 1955
                  Number of boats owned 32
                  Bayliners
                  2655
                  2755
                  2850
                  3870 presently owned
                  Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner

                  Comment


                    #10
                    What about using two single bank 10 amp chargers. Would that work?
                    Just love being on my 3870............Bill
                    1985 3870
                    Twin 130 Mits. not turbo charged
                    Name of boat is "Plenty Of Fish"
                    Live on board full time.
                    North Myrtle Beach, SC

                    Comment


                      #11
                      Originally posted by Old_Man_With_A_Boat View Post
                      I have been thinking about up grading my charger since I have up graded my house bank. I went from one 8D to 4 golf cart 6v batters. I have been looking at a Marinco Charge Pro ether a 2 bank 10 amp, or a 2 bank 20 amp charger. The golf cart batters are for the house and the start is one 8D. Which one do I need? Marinco Charge Pro
                      Get the largest charger you can justify money wise. 20 amps will work, larger would speed recharge times.
                      Buy a model that can charge one bank with its full capacity.
                      Connect an ACR between your start and house battery.

                      I like the Xantrex Truecharge 2 units and the blue seas ACR.

                      We have all of those at my boating store www.boatparts4less.com



                      KEVIN SANDERS
                      4788 LISAS WAY
                      SEWARD, ALASKA

                      Comment


                        #12
                        Originally posted by Old_Man_With_A_Boat View Post
                        What about using two single bank 10 amp chargers. Would that work?
                        I did something similar on my 3055. I have a charger for my house and a charger for my starting banks. I went with two ProMariner 1210P chargers. They are 2 bank so if one does go bad I have redundancy. I also have the remote monitor for the house bank to monitor battery levels when on the hook. I have attached a photo. (note they are wired to the boats grounding system now, this was right after the install and I did not have any green wire on the boat). Link to the charger too.

                        http://www.promariner.com/en/63110

                        Attached Files
                        Phil, Vicky, Ashleigh & Sydney
                        1998 3055 Ciera
                        (yes, a 1998)
                        Previous boat: 1993 3055
                        Dream boat: 70' Azimut or Astondoa 72
                        Sea Doo XP
                        Sea Doo GTI SE
                        Life is short. Boats are cool.
                        The family that plays together stays together.
                        Vice Commodore: Bellevue Yacht Club

                        Comment


                          #13
                          when it comes to using two different models of wet cell batteries, such as 12v-8D vs multiple 6vGC batts wired for 12volt, when charged thru a charge/combiner relay, they can ALL be charged from the SAME source providing you are using the regular charge profile, and NO custom charge profiles have been set up in the charger, AND its best if the charge source is connected to the house bank so the 8D will charge thru the relay..

                          depending on how basic the charger is, there may or may not be advantages to a charge/combiner relay.


                          NU LIBERTE'
                          Salem, OR

                          1989 Bayliner 2556 Convertible
                          5.7 OMC Cobra - 15.5x11 prop
                          N2K equipped throughout..
                          2014 Ram 3500 crew cab, 6.7 Cummins
                          2007 M-3705 SLC weekend warrior, 5th wheel
                          '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                          Heavy Equipment Repair and Specialty Welding

                          Comment


                            #14
                            Originally posted by Centerline2 View Post
                            when it comes to using two different models of wet cell batteries, such as 12v-8D vs multiple 6vGC batts wired for 12volt, when charged thru a charge/combiner relay, they can ALL be charged from the SAME source providing you are using the regular charge profile, and NO custom charge profiles have been set up in the charger, AND its best if the charge source is connected to the house bank so the 8D will charge thru the relay..

                            depending on how basic the charger is, there may or may not be advantages to a charge/combiner relay.
                            I like to connect the battery charger to the house bank, and let the ACR keep the engine battery (which should not go down anyway) charged.

                            KEVIN SANDERS
                            4788 LISAS WAY
                            SEWARD, ALASKA

                            Comment


                              #15
                              The rule of thumb is to have the charger AT LEAST 1/10th the amp hours of the batteries.
                              Example: you have a pair of 100 amp hour batteries, so the charger is minimum of 20 amp.
                              Don't worry if the batteries are unequal sizes; the smart charger will figure it out.
                              Captharv 2001 2452
                              "When the draft of your boat exceeds the depth of water, you are aground"

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