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Make your own 400Wh portable power battery for less than $100

Discussion in 'Technology' started by OnHartung'sRoad, Sep 28, 2019.

  1. Sep 28, 2019 at 10:09 AM
    #1
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

    Joined:
    Jul 24, 2017
    Member:
    #224878
    Messages:
    6,539
    Somewhere in the Mojave Desert...
    Vehicle:
    2017 Tacoma OR 4x4 (formerly 2002 OR 4x4, 1995 4x4 4Runner, 1985 4x4 Toy PU) ... and RIP’s (rust in pieces) to a Bronco II 4x4 & S10 Blazer 4x4
    I made this 12v 35Ah (420Wh) portable power battery with left over parts, but you can do it for $100 to $150 (or more) depending on options you want, such as solar charging, vehicle charging vs. 120v charging, adding a 120v power inverter, etc.

    A8DDD255-BFD2-4181-B65C-0C285C9BBD95.jpg
    11C1CECD-4761-45F7-825B-ED374C6FDB36.jpg

    The battery is based on a low cost 12v 35Ah deep cycle gel cell made for mobility scooters and trolling motors like these:

    Mighty Max Battery ML35-12 - 12V 35AH U1 Deep Cycle AGM Solar Battery Replaces 33Ah, 34Ah, 36Ah Brand Product https://www.amazon.com/dp/B00K8E0WAG/ref=cm_sw_r_cp_api_i_0h5JDbNJ4P8G9

    The case is a $9 HF plastic ammo box with a built-in handy cover storage area for cables, connectors, etc. I cut about 1/3 off the side of the tray and used it to mount the switch panel and 12v and USB charging plugs to:

    https://www.harborfreight.com/tactical-ammoutility-box-64113.html

    And I added a switch, voltage meter, USB power plugs and a cigarette lighter plug port like this to it:

    Linkstyle 4 in 1 Charger Socket... https://www.amazon.com/dp/B07JHH5YP4?ref=ppx_pop_mob_ap_share

    Also adding a 13.8v step up transformer to run my refrigerator and drone charger as they are designed for slightly higher voltage than the 12v a automotive battery provides after the engine turns off: DC-DC Boost Module 9-14V to 13.8V... https://www.amazon.com/dp/B01AW1JKO8?ref=ppx_pop_mob_ap_share


    This project is in progress still (adding fuses and additional plugs) so I will add more info to the build, including how to make just the basic version with the parts listed above and just a few more.
     
    Last edited: Jul 12, 2020
  2. Oct 7, 2019 at 12:34 PM
    #2
    Pickeledpigsfeet

    Pickeledpigsfeet Well-Known Member

    Joined:
    Sep 19, 2013
    Member:
    #112813
    Messages:
    955
    Gender:
    Male
    Foothills, CA
    Good info and thanks for the links.

    How are you charging it while on the road? Did you make a pigtail for the back of the alt that goes to your DC-DC charger?
     
  3. Oct 7, 2019 at 4:30 PM
    #3
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

    Joined:
    Jul 24, 2017
    Member:
    #224878
    Messages:
    6,539
    Somewhere in the Mojave Desert...
    Vehicle:
    2017 Tacoma OR 4x4 (formerly 2002 OR 4x4, 1995 4x4 4Runner, 1985 4x4 Toy PU) ... and RIP’s (rust in pieces) to a Bronco II 4x4 & S10 Blazer 4x4
    The plug on the lower left front of the case near the DC to DC charger is the input for powering the charger when I’m on the road. It automatically switches off if the main battery runs low or the auxiliary battery is fully charged. There’s another plug inside the box for when I’m solar charging it too. I am using temporary wires from the batteries, will be running permanent ones soon.

    I can unplug either of the charging power input wires if I want to move the battery somewhere else.
     
    Last edited: Oct 9, 2019
  4. Oct 9, 2019 at 8:57 PM
    #4
    OnHartung'sRoad

    OnHartung'sRoad [OP] -So glad I didn't take the other...

    Joined:
    Jul 24, 2017
    Member:
    #224878
    Messages:
    6,539
    Somewhere in the Mojave Desert...
    Vehicle:
    2017 Tacoma OR 4x4 (formerly 2002 OR 4x4, 1995 4x4 4Runner, 1985 4x4 Toy PU) ... and RIP’s (rust in pieces) to a Bronco II 4x4 & S10 Blazer 4x4
    Just ran a pair of 4ga wires from the auxiliary battery in the engine bay back along and inside the passenger side frame to the rear passenger cubby where I will use a Blue Seas fuse block as a junction for accessories including the portable battery. Pics soon...
     
    Last edited: Oct 9, 2019
  5. Oct 9, 2019 at 9:05 PM
    #5
    mCat

    mCat Well known member.....lol member

    Joined:
    Jan 18, 2014
    Member:
    #120912
    Messages:
    447
    Gender:
    Male
    First Name:
    Mike
    Bay Area
    Vehicle:
    2014 Tacoma TRD DCSB
    Following. Need something like this for my little Scamp travel trailer. Would be great to put in front right behind the propane tank.
     
    OnHartung'sRoad [OP] likes this.
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