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Single battery v. Dual battery (Off grid side by side)

Discussion in 'Technical Chat' started by BrotherBudro, Sep 5, 2017.

  1. Sep 5, 2017 at 7:17 AM
    #1
    BrotherBudro

    BrotherBudro [OP] Well-Known Member

    Joined:
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    Member:
    #78690
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    479
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    Male
    First Name:
    David
    Nashville
    Vehicle:
    2017 SR5 Access Cab, V6 4X4
    Leer 100XR, Dual Battery, Dog Platform, Sleeping Platform, Ham, CB, Light Bar, Rear Lights,
    I'm in the process of building out the back of my Taco for camping. I plan to have a behind the bumper light bar, some rear-facing camp lights. I ordered the 3 cig 12V DC power block from Leer and plan to use it to run a fan in the summer and some sort of heated travel blanket in the winter and probably charge some phones overnight. I will more than likely driving during the day to charge up, but might stay stationary for 2 nights.

    Will a single battery setup suffice? I was thinking the X2 31M battery + a larger battery cage.

    Do I need to go dual batteries? If I go dual, I have a few more questions:
    1. I was thinking about going with the Off Grid Engineering Side by side kit.
      1. If I do, will the extra Yellow Top provide enough juice to power my stuff (in conjunction with my current battery or a matching Yellow Top)?
    2. Would a Blue Top get the job done, using my current stock battery as a starter?
      1. I know the recommendation is two get two of the same style battery, about the same age, but I'm not too thrilled about replacing my stock battery that is not even a month old.
    3. Would the Blue Top even fit side by side with my stock battery?

    My local off-road shop said they can make a dual battery setup work, all I have to do is bring in the deep cycle I want to use, and they will do the rest. I like this idea because I can still use my current starter battery, but I'm worried they might not be the experts in this area. Also, where else could I even mount a second battery if not in the Off Grid Side by Side system? I don't have a TRD Off Road, so the Split System is a no-go.
     
  2. Sep 13, 2017 at 6:08 AM
    #2
    jesse.thomas

    jesse.thomas MisguidedMelon

    Joined:
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    Jesse
    Mile High
    Vehicle:
    '17 TRD Off Road Super White
    Stock
    If you are going to be camping out of the back for more than just a couple of nights, I would definitely look at getting a dual battery setup. You don't want to be left stranded somewhere because your starting battery is dead. I'm building out a dual battery system in my '17 right now. I'm using the off grid engineering Auxilliary battery tray with an old Group 27 deep cycle battery. Right now its hooked up to a solar panel in the bed of the truck that keeps it topped off, but eventually I will be connecting it to the main starting battery using an Automatic Charging Relay from Blue Sea. I've only had the OGE tray for a couple of days but it is very well built and it fits very nicely in the space behind the air box (if you have the Off Road).

    20170911_145419.jpg

    I'm not sure about the heated blanket but the yellow top should be more than capable of charging a couple of cell phones many times between charges. You'll need to know how many amps the accessories you have draw and for how long you want to run them. These lead-acid batteries love to be charged, so try to leave as much room in the budget as possible so it doesn't get run down too much. I found this following website to be useful in determining (roughly) whether my battery is capable of running the accessories I wanted.
     
  3. Sep 13, 2017 at 6:26 AM
    #3
    BrotherBudro

    BrotherBudro [OP] Well-Known Member

    Joined:
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    Messages:
    479
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    First Name:
    David
    Nashville
    Vehicle:
    2017 SR5 Access Cab, V6 4X4
    Leer 100XR, Dual Battery, Dog Platform, Sleeping Platform, Ham, CB, Light Bar, Rear Lights,
    Looks like the heated blanket is 48 watts and 4 amps. If there are any experts here that can tell me how long it would take for that to drain the Yellow Top.
     
  4. Sep 13, 2017 at 2:36 PM
    #4
    jesse.thomas

    jesse.thomas MisguidedMelon

    Joined:
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    First Name:
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    '17 TRD Off Road Super White
    Stock
    The yellow top comes with two ratings: 66Ah or 75Ah
    You should never discharge the battery below 20% of its capacity so we'll take 80% of the total rated Ah for our calculations:
    66*0.8 = 52.8
    75*0.8 = 60

    To figure out how many amps the blanket will pull:
    48Watts / 12V = 4A

    To find out how long you can run the blanket continuously on the battery between charges:
    52.8Ah / 4A = 13.2 hrs
    60.0Ah / 4A = 15 hrs

    This is theoretical, and there is going to be some efficiency loss in the system from the cables, any inverters, heat, etc.
     
    BrotherBudro [OP] likes this.
  5. Sep 13, 2017 at 3:23 PM
    #5
    BrotherBudro

    BrotherBudro [OP] Well-Known Member

    Joined:
    May 12, 2012
    Member:
    #78690
    Messages:
    479
    Gender:
    Male
    First Name:
    David
    Nashville
    Vehicle:
    2017 SR5 Access Cab, V6 4X4
    Leer 100XR, Dual Battery, Dog Platform, Sleeping Platform, Ham, CB, Light Bar, Rear Lights,
    Awesome, Thank you!
     

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