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  • Battery question......?

    Here I go, trying to learn something new about batteries.
    I plan on adding a second battery to my system, (Basic riverboat).
    The existing battery is only a year or so old and seems ok, it is a marine battery but not a deep cycle battery, its made by Exide and called a "starting battery".
    Exide offers a deep cycle, a dual purpose and a starting battery, the question is, can I use a deep cycle with the starting battery?
    I know the sytem will function as they are both 12 volt group 24 batteries.
    I am wondering if because they are diffrent types, could that shorten the life of both batteries? I know in any dual battery situation both should be replaced at the same time, however if I can save a $ that would be ok.
    He who know nothing, still knows nothing

  • #2
    Info for dual battery use in your boat

    You can mix and match batteries in your boat with no problem if you use a marine battery isolation switch. Deep cycle batteries are designed to survive when repetitively run all or almost all the way down on longer term, low amperage draw conditions. They don't last long if used for starting the main boat motor.

    Starting batteries are designed to survive when used to start engines, which is a short term high amperage draw condition. It isn't conducive to long life to use a deep cycle battery as a starting battery, and it isn't good to run a starting type battery real low (like you would if running an electric trolling motor, for example).

    If you switch from the starting battery over to the deep cycle when you are going to run an electric trolling motor, and then back to the starting battery when you are ready to start the boat's main motor, you can then use the switch to connect both batteries for recharging purposes.

    If you aren't going to repetitively run one of the batteries low, I wouldn't recommend using a deep cycle battery for your second battery. Just install a second starting type battery, along with the battery switch, and generally operate just from one or the other, occasionally switching between them to keep them both fully charged. Then you will always have a fully charged backup.

    Best Regards,
    Jim
    Last edited by midnightsunfun; 03-09-2009, 20:06. Reason: One more note--You don't need to replace both at the same time.

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    • #3
      Originally posted by midnightsunfun View Post
      You can mix and match batteries in your boat with no problem if you use a marine battery isolation switch. Deep cycle batteries are designed to survive when repetitively run all or almost all the way down on longer term, low amperage draw conditions. They don't last long if used for starting the main boat motor.

      Starting batteries are designed to survive when used to start engines, which is a short term high amperage draw condition. It isn't conducive to long life to use a deep cycle battery as a starting battery, and it isn't good to run a starting type battery real low (like you would if running an electric trolling motor, for example).

      If you switch from the starting battery over to the deep cycle when you are going to run an electric trolling motor, and then back to the starting battery when you are ready to start the boat's main motor, you can then use the switch to connect both batteries for recharging purposes.

      If you aren't going to repetitively run one of the batteries low, I wouldn't recommend using a deep cycle battery for your second battery. Just install a second starting type battery, along with the battery switch, and generally operate just from one or the other, occasionally switching between them to keep them both fully charged. Then you will always have a fully charged backup.

      Best Regards,
      Jim
      Jim, Thanks for the info, I do plan on adding the second battery for a T. Motor or to operate a winch, so will plan on using a deep cycle. Any battery/ dealer recomendations in Fairbanks?
      John
      He who know nothing, still knows nothing

      Comment


      • #4
        I like one of each

        I have had a high cranking amp and a marine deep cycle battery hooked up in my boat for many years. With the isolator switch it makes it easy to run on one or the other depending on what your activity happens to be at the time. If I am out for a few days at a time, I usually switch over each day to run on and charge batteries individually. I put the switch in the "both" position when running long distances.
        I don't think you will have any trouble with the batteries performance because one is older than the other. My batteries are a couple of years apart, the starter battery being the oldest. As long as you keep a good charge in them, especially overwinter, they will last a long time.

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        • #5
          The deeper you discharge a deep cycle battery, the less long it will last. Although most marine deep cycle batteries will tolerate an occasional 80% discharge, you probably don't want to go below 50% on a regular basis.

          Here's a link to a helpful FAQ on deep cycle batteries.

          http://marine-electronics.net/techar..._faq/b_faq.htm

          Comment


          • #6
            Concider an ACR

            Look into ACR's ( Automatic charging Relays). When used with the proper battery switch set up, you can keep both batteries isolated and charged as needed. I use one battery for the motor only, and the 2nd battery for all the electronics and stuff. When either battery is fully charged, it automatically drops it out of the charging circuit ( motor alternator ), and automatically adds it back in when necessary.
            I almost never use the battery switch setting at " Both" , because with an ACR, both batteries get charged as needed, stay isolated, and I never have the issue of running both batteries down accidentally because the switch is set to "Both, and I left something on...

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            • #7
              Any battery/ dealer recomendations in Fairbanks?
              John[/quote]

              I have been using batteries from Costco for about 15 years. I have a 2 battery set up in my bowpicker, with a battery switch (#1 #2 or both). I buy one a new battery about every other year so i always have one fairly new battery on board, its been working great for all these years. I leave the batteries in the boat all winter but have a "smart charger" hooked up to them to keep them nice and snappy.
              sigpic
              Alaska Shrimp Pots

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              Ropes, Buoys, Bait
              alaskashrimppots.com
              akshrimppots@mtaonline.net
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              • #8
                Originally posted by Akgramps View Post
                Jim, Thanks for the info, I do plan on adding the second battery for a T. Motor or to operate a winch, so will plan on using a deep cycle. Any battery/ dealer recomendations in Fairbanks?
                John
                I would think that a second start type battery would work just fine for this application. No long term low amp draw involved here. This is actually a high amp short term draw. It would be good to have them isolated to protect the charge for the start battery.
                sigpicWhat-a-Day
                27' x 9.5' Glacier Craft - Volvo 300hp D4 Diesel
                Remember: Any fool can be uncomfortable.
                Denny

                Comment


                • #9
                  How hard is it to install a dual battery switch for a mechanically "challenged" guy? I've been thinking about doing that for a couple years.

                  Comment


                  • #10
                    Originally posted by Alaskan Fly Guy View Post
                    How hard is it to install a dual battery switch for a mechanically "challenged" guy? I've been thinking about doing that for a couple years.
                    The switch is fairly simple, I am using a "perko" switch, Napa and West marine would have something similar. Some are just disconnect switches, some are set for dual batteries. Take a close look to make sure it applies to what you want to do. they will come with a wiring diagram.
                    Essentially the negatives on both batteries are connected together, the postive from each battery will attach to a lug on the switch. Then from a third lug ("switched lug") on the switch you will attach the wire that runs to the starter on the motor. If you have a console you most likely will have some wiring from there as well. That wiring, which will be a much lighter gauge should also connect to the "switched lug" on your disconnect switch. That way when you turn off the switch everything is off. There can be many variables, but that is the idea for a basic setup.
                    He who know nothing, still knows nothing

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                    • #11
                      Originally posted by Alaskan Fly Guy View Post
                      How hard is it to install a dual battery switch for a mechanically "challenged" guy? I've been thinking about doing that for a couple years.
                      I agree it's not hard.
                      That being said why is it so many so called profestionals get it wrong?

                      Almosts anyone can make it work for a short time. Building a battery system to continue to work for several years, takes a person who knows what he is doing.


                      Not knowing what I am doing, never stopped me from learing what to do and how to do it.

                      Go for it.

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                      • #12
                        I'm a firm believer in Optima Blue Top Batteries (Deep Cycle). It can operate upside down, Sideways, there is no liquid inside and no maintenance and they hold an awesome charge.They have outlasted any other battery I have ever used I would dare to day 2 to 1. Optima is all I buy for anything I ride. I put a full charge on it, and disconnect the cables in the fall, and come spring time, they are ready to go.

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                        • #13
                          I purchased 4 of the Sears AGM batteries last spring. I have never used a battery that retained a charge as long as they do. Sears even gives them a full 3 year warranty for free replacement.
                          The batteries are rated as both "starting" and "deep cycle"

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                          • #14
                            Hey Gramps

                            I have a two battery system in my Wooly. I used an ACR for years, then when I repowered, I discovered that Evinrude has a seperate charging circuit for dual batteries. I have one marine starting battery that is only used to start the big 250 and the kicker.

                            The other battery is a Marine Deep cycle which is the "house" battery and everything else is connected to that. If I remove the batterries in the winter and store them in the garage they last me about 4 years +. I get mine from Costco or Walmart.

                            Good luck
                            sigpic
                            ALASKAN SEA-DUCTION
                            1988 M/Y Camargue YachtFisher
                            MMSI# 338131469
                            Blog: http://alaskanseaduction.blogspot.com/

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                            • #15
                              odyssey batts

                              http://www.odysseybatteries.com/batt...1200series.htm
                              I just installed two of these. supposed to be the latest and greatest technology. I mostly did it because of there size. Two fit prefectly under my dog house. I couldn't find them in Fairbanks, only at Batteries plus in Wasilla. I also went with a blue seas dual switch and Batt isolater from napa, www.surepower.com. pretty easy install. I would recommend buying audio battery wire, it's the same marine grade (tinned copper) for about 1/3 of the price. http://knukonceptz.com/. good luck

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