Dual Battery Setup with Detailed DIY Install

We show you what we consider the best dual battery system for powering an automotive fridge and accessories. And, we show you in detail how to install it! We also show you how we made and wired our outlet/gauge panel.
While researching second battery systems we learned about Redarc dc-dc chargers. It didn’t take long for us to decide a dc to dc charger was the direction we needed to go in. They make for a super efficient power source.
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The majority of the parts and components we use for the install were obtained from Overland Power Solutions.

Below are links to where we got everything else.

This video will explain in greater detail why you should choose a dc-dc charger;

Here is where we got the ABS plastic we used for the charger base/battery hold-down; https://www.amazon.com/gp/product/B00JPHTIES/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1

The plastic sheet we used to make the outlet panel; https://www.amazon.com/gp/product/B00CF4AELE/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1

The switches we installed in our power panel; https://www.delcity.net/store/50-Amp-Toggle-Switch-with-Interchangeable-Boots/p_789183.h_789188

Anderson Plug; https://www.amazon.com/gp/product/B07DWXM7DD/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1

Dash mounted indicator light (at time of order ask them to put a green LED in it.); https://www.amazon.com/gp/product/B071YTV56M/ref=ppx_yo_dt_b_asin_title_o03__o00_s00?ie=UTF8&psc=1

Rear Cargo Storage Panel;

  • Seriously professional fabrication of that Rear Power Outlet Panel!! Beautiful job, it is a shame to be hidden behind that monster 75L fridge/freezer though I must say it fits well into the back of the 4Runner. I'd be tempted to go with the window mount box but wonder if that would hinder the opening of the fridge/freezer? Been considering the Dometic myself but tempted to go with the 50L as it consumes about 40% less energy. You may want to use the insulated cover for it too. Roughly how much does a system like this cost from Overland? That DC-DC battery charger is such a game changer!

    Looking forward to hearing your follow-ups with how well it performs. The solar option is a major bonus with being able to drop a stand alone MPPT charge controller. You'll definitely want/need that to keep that fridge/freezer going otherwise the dual battery will take a good whoopin' lol.

    You guys have a seriously good channel, sure appreciate the effort you put into making these videos, a real labor of love!

  • I've been anxiously awaiting this video. I just picked up the C4 battery mount a few days ago (C4 is awesome) after looking at all the other very expensive 4runner options out there. Glad to see a more DIY solution and love the rear power panel. Would love to hear about what influenced the various decisions on each of the components (25amp vs 40 amp redarc, AGM battery choice, etc). Thank you again for another great production.

  • Thanks guys, what you doing is great? Question: since you have fj cruiser as well, I was wondering if that Dometic 75 is fitting in the cargo area of fj cruiser without folding the rear seat?

  • I'm so not there yet in my power needs but I like your setup and could see a similar setup in my future. Although I won't be doing said setup myself, cuz I just don't have the patience for all that, I still watched the video as if I would do it myself.

  • Awesome video and work. Just a few questions
    1. Will you be retiring the bussman fuse/relay set up or will you route it to the 2nd battery?
    2. Why use 40amp breaker on this set up instead of 80( i think thats what you have on the bussman)?
    3. How do decide what is connected to the 2nd batter vs the main.
    Thanks again for sharing the k bbn knowledge.

  • I wondered why in my JKU i could get my 2nd battery to 14+ volts no problem, but know that I have a 4runner, the same battery only gets to 13Volts…you just answered that question for me. I had no idea a smart alternator even existed?? Thank you! Now to search out a little more budget friendly option….lol Thanks for your vids!

  • hi all of you at wonder lost overland i was very interested in this video and the duel battery set up but I lost my hearing from a job I use to have can you please turn the caption on I checked no you don't have the caption on on you're system caption please and let me know me know when you have the caption working and I will come back to watch yes I'm subscribed to you're channel thank you have a good day 🙄 🙂 C😎😎L

  • Awesome video, i got a few points. 1) the 5th gen 4runner has a temperature compensated alternator, as such I do not think the blue ignition wire was necessary. Why did you choose to hook it up? 2) In their manual, REDARC does not like breaker and recommend MIDI type fuse, personally, I think a good breaker like the bluesea is not an issue. It will interesting to see how it performs. 3) Did you duse the brown wire? Albeit short run but expect to see 35amps at times. 4) You grounded both batteries together, if the charger is grounded to neg pole of accessory battery, isn't it sufficient? Why adding a ground to the body? 5) Why did you choose AWG 4 wire? Most amps you will see in the engine bay is 35 amps, even with both batteries separated this way, AWG 8 could be enought. However, bigger does not hurt.
    Sorry for so many questions but hope it could help to clarify. Thanks again for putting time and effort doing this. Cheers

  • Thank you for this wonderful how to. Have been waiting for ever seems like 4 your next video & as always you never disappoint. KnuKonceptz has battery terminals that might work?

    Sorry for the auto spell Engrish. Lol

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