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Discussion Starter · #1 · (Edited)
Alright guys need some input here. Just swapped out the lead acid batteries in my travel trailer for Lion energy UT1300 LiFePO4 batteries. Question is.....will this mess up the Ascent battery when the 7 pin is connected because these have different charge rates / capacities and voltages? I’m worried that my LiFePo batteries will try to equalize with the car battery and over charge it.
Or does the pass through charging on the 7 pin only go 1 way? (From Ascent to trailer).

Leads me to my next thought.... can I just pull the wire out of the 7 pin that is the “charging” Wire? I have solar on my rig and don’t need to charge my rig batteries from the Ascent anyway. Thanks!
 

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How about using the charge controller to charge the LiFePO4 batteries? Or getting one that accepts a separate DC input to do so?
 

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Discussion Starter · #3 ·
I have not swapped out the trailer charge controller (via tow vehicle) for the new battery set up.....And don’t necessarily want to if I don’t have to. The solar charge controller is set for LiFePO4, but then once I plug in the Ascent 7 pin I don’t want the trailer (Higher voltage batteries 14.6v to interfere with the car battery 12.6 ish?
 

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Discussion Starter · #4 ·
Or I guess I can simply disconnect the 12V power on the trailer side of the 7 pin harness ...to keep them separate 🤔
 

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@Spotakus , what did you learn. I’m thinking of putting lifepo4 lion’s (yay Costco sale) too and did not consider this. Did you have any issue as-is or did your hookup require modification?
 

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Discussion Starter · #6 ·
@Spotakus , what did you learn. I’m thinking of putting lifepo4 lion’s (yay Costco sale) too and did not consider this. Did you have any issue as-is or did your hookup require modification?
Hey @Chado, this is turning out to be a non issue. What I did for a test is put my volt meter on the ascent terminals and it charges at 14.2V if I remember correctly and that’s what I set the charge controller at (which is close enough for me for the Lion energy batteries.) Been good for the last few weeks!
 

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I hope you are aware that any Li based battery has to be charged at a reduced rate below 40F and cannot be charged at all below 33F. So most people put these little firebombs in the conditioned area 💀

 
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