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How much is too much (Into the battery)

Discussion in '2nd Gen. Tacomas (2005-2015)' started by diabetiktaco, May 31, 2019.

  1. May 31, 2019 at 9:47 AM
    #1
    diabetiktaco

    diabetiktaco [OP] Instalander

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    Eric
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    I've replaced my battery with an 80AH 94R agm. I've got the following electronics..

    ARB 50Qt fridge
    5 LED auxillary lights
    Fridge monitor
    Midland MXT115 GMRS
    Garmin GPS
    Ipad mini
    Escort radar / dash cam integrated into it
    Scangauge II
    ARB Dual compressor

    And all of the factory stuff as well. I understand most of that doesn't draw much, but all of it together does. At what point am I looking at going dual battery? Or is this sufficient. I run the fridge often, but not daily and it's rare that I'd have EVERYTHING going at the same time.
     
  2. May 31, 2019 at 9:59 AM
    #2
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    You have all it operating with the truck not running or is it really just the fridge you leave running while parked at camp?
     
  3. May 31, 2019 at 10:00 AM
    #3
    crashnburn80

    crashnburn80 Vehicle Design Engineer

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    You need to add up the current draw for each of those devices. All that is very minor save the ARB compressor and fridge. And the ARB should be wired (if using their wiring kit) to only come on when the vehicle is running, meaning the load is effectively managed by the alternator, not so much the battery. The time when the current draw matters most for the battery is when you are running all the devices with the vehicle off, so the alternator is not providing the power and you are relying soley on battery power.

    Add all the amps up for everything up that you would run at the same time with the vehicle off. Batteries have a reserve capacity rating (RC), which is number of minutes that battery will sustain a 25A draw. Take the 25A RC and divide that by the amps you added up RC, then multiply it by number of minutes.

    Example:
    Battery has a 90 min RC
    Sum of all items is 4A
    25A/4A = 6 So then 6 x 90min = 540 minutes of run time

    For running an AGM you should also adjust your charge voltage up as discussed here:
    https://www.tacomaworld.com/threads/the-northstar-agm-battery-voltage-booster-upgrade.604478/
     
  4. May 31, 2019 at 10:35 AM
    #4
    diabetiktaco

    diabetiktaco [OP] Instalander

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    Just fridge and iPad.
     
  5. May 31, 2019 at 10:35 AM
    #5
    diabetiktaco

    diabetiktaco [OP] Instalander

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    Great answer, thanks. I'll do the math but quick math tells me I'm fine with what I've got.
     
    crashnburn80 likes this.

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