1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Dual Battery Questions.

Discussion in 'Technical Chat' started by Ferball, Apr 8, 2022.

  1. Apr 8, 2022 at 7:21 PM
    #1
    Ferball

    Ferball [OP] Well-Known Member

    Joined:
    Mar 2, 2019
    Member:
    #285065
    Messages:
    414
    Gender:
    Male
    First Name:
    Brent
    Unity, New Hampshire
    Vehicle:
    2019 Cement TR5
    I have been doing my research for a dual battery setupf for camping, and now I have questions. I was planning on using a smart isolator and run a parallel charging setup. Then I learned about "smart alternators" I am thinking my plan won't work. What are the downsides of disabling a smart alternators? Could I just tap the charging pin on the trailer plug to charge my second battery? Or can I tap off the bed inverter before the inverter and this will give me enough voltage to charge a second battery? I know the easy answer is just plug a charger into the bed inverter, but is it as simple as that?
     
  2. Apr 8, 2022 at 7:26 PM
    #2
    MGMDesertTaco

    MGMDesertTaco Come on, live a little...

    Joined:
    Jan 30, 2021
    Member:
    #354573
    Messages:
    6,973
    Gender:
    Male
  3. Apr 8, 2022 at 7:28 PM
    #3
    MGMDesertTaco

    MGMDesertTaco Come on, live a little...

    Joined:
    Jan 30, 2021
    Member:
    #354573
    Messages:
    6,973
    Gender:
    Male
    On second thought you might want to look into an aftermarket tune that will bump the ecu alternator charge voltage up for agm batteries. A tune might offer the answer you're looking for.
     
    Bastek likes this.
  4. Apr 8, 2022 at 8:01 PM
    #4
    Ferball

    Ferball [OP] Well-Known Member

    Joined:
    Mar 2, 2019
    Member:
    #285065
    Messages:
    414
    Gender:
    Male
    First Name:
    Brent
    Unity, New Hampshire
    Vehicle:
    2019 Cement TR5
    I had simple solar set up on my previous truck. I upgraded to sn access cab and there are no roof rack options that don't involve drilling holes in my roof so the simple idiot in me thinks there has to be a simple and cheap way to put juice into my charge controller from the truck instead of a panel when driving, and when not driving I can set my panel up and use that to feed my charge controller.
     
  5. Apr 25, 2022 at 12:14 PM
    #5
    wi_taco

    wi_taco My skid plates give rocks taco flavored kisses

    Joined:
    Jul 20, 2020
    Member:
    #335129
    Messages:
    3,473
    First Name:
    Adam
    SE Wisconsin
    Vehicle:
    2015 DCSB OffRoad
    MGMDesertTaco likes this.
  6. Apr 25, 2022 at 12:19 PM
    #6
    codyjphoto

    codyjphoto Well-Known Member

    Joined:
    Jul 10, 2021
    Member:
    #370931
    Messages:
    1,317
    Gender:
    Male
    First Name:
    Cody
    Vehicle:
    2015 gx460
    A bunch of junk
    What are you trying to power?

    I run a single agm battery
    Kd max tune accordingly
    Cascadia 4x4 solar panel on the hood


    This all allows me to effortlessly run my 45l fridge and even run camp lights for the evening with no issues to crank up and go the next day.
     
  7. Apr 27, 2022 at 10:03 PM
    #7
    4-Day-Work-Week

    4-Day-Work-Week Well-Known Member

    Joined:
    Jan 24, 2022
    Member:
    #388343
    Messages:
    49
    Vehicle:
    2022 OR DCLB Army Green

    What size battery are you running? I am getting ready to permanently install a Iceco VL45 for work that will be run to my starter battery. I’ll have a Lensun 85w panel to keep stuff topped off for this daily driver.I’m trying to figure out if I need to move to a group 31 (battery tray as well) or if I can run an AGM in stock size.
     
    Last edited: Apr 27, 2022
  8. Apr 28, 2022 at 3:14 AM
    #8
    codyjphoto

    codyjphoto Well-Known Member

    Joined:
    Jul 10, 2021
    Member:
    #370931
    Messages:
    1,317
    Gender:
    Male
    First Name:
    Cody
    Vehicle:
    2015 gx460
    A bunch of junk

    I'm running a 55ah, never had an issue
     
  9. May 7, 2022 at 2:57 PM
    #9
    cactushead

    cactushead Well-Known Member

    Joined:
    Sep 12, 2015
    Member:
    #164087
    Messages:
    286
    Gender:
    Male
    San Diego
    Vehicle:
    2017 MGM DCSB 4x4 TRDOR
    Front hitch, 5100's, 885's, Snugtop XV, Slimline II, Sumos, bed platform, AAL, interior LED lights in cab and bed, exterior camp/backup LED's, Rigid DOT Fogs and D2 Pro Spots, Mega Ultra +130 bulbs, heavy-duty fog light, spot light, and low beam wiring harness, Weathertech mats, Re-routed dif breather and A/C drip line, dash cam, front and side cameras, anytime rear camera and nav, Blue Seas fused bus bars to cab and bed, heavy-duty bus bar w/Anderson quick disconnects under the hood for powering winch, solar, air compressor, and other accessories.
    Last edited: May 7, 2022
    4-Day-Work-Week likes this.
  10. May 8, 2022 at 3:10 PM
    #10
    cactushead

    cactushead Well-Known Member

    Joined:
    Sep 12, 2015
    Member:
    #164087
    Messages:
    286
    Gender:
    Male
    San Diego
    Vehicle:
    2017 MGM DCSB 4x4 TRDOR
    Front hitch, 5100's, 885's, Snugtop XV, Slimline II, Sumos, bed platform, AAL, interior LED lights in cab and bed, exterior camp/backup LED's, Rigid DOT Fogs and D2 Pro Spots, Mega Ultra +130 bulbs, heavy-duty fog light, spot light, and low beam wiring harness, Weathertech mats, Re-routed dif breather and A/C drip line, dash cam, front and side cameras, anytime rear camera and nav, Blue Seas fused bus bars to cab and bed, heavy-duty bus bar w/Anderson quick disconnects under the hood for powering winch, solar, air compressor, and other accessories.
    The short answer is YES, a stock 24 AGM will work, as long as your battery is getting charged from either your alternator or SCC.

    My first solar setup was designed around a 20w mppt charge controller, an X2 24F AGM deep cycle primary battery, and a 100w panel. This configuration worked fine with my Dometic CFX-40 fridge, as long as I got a few hours of sun.

    Unfortunately, my primary parking space at home is in the shade. If I didn’t drive for a few days, I felt compelled to move my truck to a spot in the sun. That’s why my solar redesign included the addition of an auxiliary 100ah LiFePO4 battery and a DC-DC charger.
     

Products Discussed in

To Top