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Dual Battery set up

Discussion in 'Technical Chat' started by Andrew K, Jul 14, 2014.

  1. Jul 14, 2014 at 7:37 AM
    #1
    Andrew K

    Andrew K [OP] yeah...im a newbie

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    Andrew
    Chesapeake, VA
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    camper shell, rod racks, not much. its a fishing truck
    anyone on here have a dual battery set up?

    im brainstorming about having a second battery to assist with accessories for those long nights on the beach, with out having to worry about killing my main battery.

    I have been on several boats that have a selector switch that allows the captain to switch between batteries (to advoid draining both), but also allows them to be able to charge both at the same time.

    so ideally i would be able to drive up to Assateague, having both batteries charging off the alternator while driving, then hit the beach and once im settled in my spot, change the switch to the aux battery for accessories, lights, chargers, etc.
     
  2. Jul 14, 2014 at 10:00 AM
    #2
    Andrew K

    Andrew K [OP] yeah...im a newbie

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    camper shell, rod racks, not much. its a fishing truck
    before posting i searched and couldn't find much on this topic, then after i posted, i saw the similiar threads at the bottom. lots of good info. sounds like to me using an isolater is better than the selector switch ive seen on the boats? anyone with any thoughts?

    also does anyone have a diagram that shows the connectivity?
     
  3. Jul 14, 2014 at 10:34 AM
    #3
    RND2

    RND2 Well-Known Member

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    I would have to look around and see if I can find my old drawings but its super easy. Theres plenty of kits on the market pre maid but tend to be pricey and can be made for the fraction of the cost. Mine was used for the winch mainly but could be swithed to use either batteries or both at the same time
     
  4. Jul 14, 2014 at 10:36 AM
    #4
    2000GTacoma

    2000GTacoma Well-Known Member

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  5. Jul 14, 2014 at 3:52 PM
    #5
    Shadetree

    Shadetree Well-Known Member

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  6. Jul 16, 2014 at 12:14 PM
    #6
    Andrew K

    Andrew K [OP] yeah...im a newbie

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    camper shell, rod racks, not much. its a fishing truck
    i appreciate it guys, ive just spent the last 3 hours reading all kinds of good info on this...hah. any disadvantages in putting the second battery in the bed (with camper shell)? i dont have a winch and do not plan on installing one.....this is mainly for powering small accessroies (cell phone chargers, music, etc) and LED lights...
     
  7. Jul 16, 2014 at 10:28 PM
    #7
    2000GTacoma

    2000GTacoma Well-Known Member

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    Other than losing space and needing to run longer wires from under the hood to it to keep it charged not really. However if you do put it in the bed figure about how long the wire will be and choose the proper gauge wire. The longer the wire the bigger wire needs to be in order to provide "x" load. Use fuses and protect the wire however you run it so it does not rub a hole in the insulation.
     
  8. Jul 16, 2014 at 11:51 PM
    #8
    penguins_cc

    penguins_cc Well-Known Member

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    OP, I'm currently installing the Blue Sea Add-a-Battery. The 2nd battery, switch and fuse panel are going behind the rear driver seat. Somehow I think I will be able to fit a group 31 battery. You do not need two of the exact same battery for this particular setup, but like mentioned there are other similar choices.

    I think what actually happens is that the system isolates the 2nd battery when voltage drops to a certain level, ensuring your starter battery has enough charge. It does not require me to flip a switch when I arrive at my camp site.
     
  9. Jul 17, 2014 at 7:30 AM
    #9
    Andrew K

    Andrew K [OP] yeah...im a newbie

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    roger that. thanks for the input. Penguins can you post pics after your done?
     
  10. Jul 17, 2014 at 12:51 PM
    #10
    penguins_cc

    penguins_cc Well-Known Member

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    Will-do. I will post today what I have completed so far as well.
     
  11. Jul 17, 2014 at 1:01 PM
    #11
    Grakyn

    Grakyn Well-Known Member

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    I should have my dual battery setup installed within the next week or two. Going with two Optima Yellowtops and the ATO dual battery tray. BamaToy (Marion Bumper2Bumper) is setting me up with a wiring kit including isolator and upgraded alternator. Difference will be that I am running a winch, a repeater, lights, and several other accessories. Probably a bit of an overkill build for your uses, but still nice to see some different options.
     
  12. Jul 18, 2014 at 4:45 AM
    #12
    Andrew K

    Andrew K [OP] yeah...im a newbie

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    camper shell, rod racks, not much. its a fishing truck
    i looked in my engine bay yesterday afternoon and was shocked at the amount of room that is there....i may not have to go to the bed for the 2nd battery after all...
     
  13. Jul 19, 2014 at 5:24 AM
    #13
    Shadetree

    Shadetree Well-Known Member

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    Andrew, the advantage of locating your deep cycle battery (or starting battery) outside the engine compartment is that it will not be subjected to the high underhood temperatures and have a longer service life. This is because the higher temperatures accelerate the grid corrosion. The downside is the extra cost and venting depending on the battery type.
     
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