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Old 01-09-2020, 07:42 AM #1
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Dual Battery?

I am going to be installing a 2nd battery in my 4Runner. Where are you guys and girls putting your 2nd battery? Underhood, in the back? Show some pics, please thanks!


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Old 01-09-2020, 08:43 AM #2
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I moved the starting battery to the rear pass corner, then installed the house battery in the original spot (need the space to accommodate a group 31M battery). Used an Off-grid engineering battery mount in the back and a Pelfreybilt I had from my 16 Tacoma for the front. Both batteries are AGM and I use a DC to DC charger for the house battery.
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Old 01-09-2020, 09:03 AM #3
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I can't take any credit for it, but here's a very detailed explanation of the dual AGM setup that's in my truck. The PO did a great job and I love it.

https://www.toyota-4runner.org/3255206-post10.html
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Old 01-09-2020, 09:43 AM #4
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Quote:
Originally Posted by JuniorPigeon View Post
I can't take any credit for it, but here's a very detailed explanation of the dual AGM setup that's in my truck. The PO did a great job and I love it.

https://www.toyota-4runner.org/3255206-post10.html
Thanks for the link. That's a great setup, I'll have to follow that when I get around to doing mine.
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Old 01-09-2020, 03:07 PM #5
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I have plans to update the dual battery for the purpose of making improvements, but as of now here is how it sits:

My parts list can be found in this thread:
Toyota 4Runner Forum - Largest 4Runner Forum - View Single Post - Questions: Dual Bat setup and Power Distribution block from Shrock










I have started working on a triple battery setup now... with the fridge having its own dedicated 24 volt lithium battery in the back which charges off the dual battery using a DC to DC converter. I really need to do a write up on it because I have been wanting to share that but been busy. Its built out of 18650 batteries and last about for 2.5 days without any supplemental charge from alternator.




Last edited by Bumbo; 01-09-2020 at 03:18 PM.
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Old 01-09-2020, 03:42 PM #6
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I have been thinking of doing a duel battery set up as well. But was contemplating of doing a lithium battery to run much longer.
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Old 01-09-2020, 04:00 PM #7
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Originally Posted by Ripper238 View Post
I have been thinking of doing a duel battery set up as well. But was contemplating of doing a lithium battery to run much longer.
Yes, you get a lot more usable power and much better power density. The same job can be done in a much smaller and lighter package when compared to lead.

All this lithium battery stuff is kind of my thing… been working with them for many years. I am more than happy to help if you want someone to bounce ideas off of.
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