Wednesday, 12 May 2021
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Does anyone run lithium phosphate dual batteries? RV or overlander?

I have an AGM dual battery in the 4Runner and the way it is set up is really not efficient at all (differing charge voltages, 50% capacity disconnect, etc.), I probably am only able to use 30-40Ah of the 75Ah battery. It's enough for lights and phone charger overnight but not a whole lot more.

I'm looking at 100Ah with a DC-DC charger for the Sequoia. The advantage to the AGM setup is that switching to alternator power is really easy, but with the lithium I'd have to limit my load to the DC charger output or I'd be slowly draining the battery. Might not be a problem, pretty tough to get to 40A when you're driving unless you're running 5 light bars at once 😂

What are your experiences with lithium phosphate? Do you store your batteries in the house during the winter?
more than a month ago
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#2660
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I run an AGM battery as well as a 60Ah LiFePO4 house battery. House battery is charged via a REDARC DC-DC charger.

Experience is very positive (pun intended). You can drain them to 0%, even though I never get close to that. Fridge and battery come out for the winter unless I go on a trip to somewhere warm. :)
more than a month ago
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#2665
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Ok, I'll need to design for easy removal then. Do you find the 60 to be enough for more than 1 night, or just 1 night? What size is your Redarc? I am looking at the Renogy 40A.

I presume the AGM is the starter/vehicle battery right?
more than a month ago
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#2666
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I find that my fridge (Dometic CFX3 45) averages around 0.5-1.5 amps per hour (temperature dependent, of course). That's 40-120 hours of run time which is plenty for how I use it.

I previously ran the fridge off my starter battery, and that would get me at least overnight to a entire day of run time. I never pushed it passed that as I would usually be driving (and charging) the next day. I DID have to run a dedicated line from the starter battery to the fridge because there was too much voltage drop in the factory wiring.

I'm using the REDARC BCDC1225D . It's charges at 25A but they also have a 40A version. It's also ready for solar input, but I haven't needed that just yet... though it's on the bucket list. :)

Yeah, starter/vehicle battery is the AGM.
more than a month ago
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#2667
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Great, thanks for the info! I think what I've planned out should work well. I am going to try to make it interchangeable between the 94 trail rig & the Sequoia.
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