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REC-A BMS issue with Eve cells LiFePo4

  • P

    Just recently I had an issue where the negative lead between battery and shunt came slightly loose. This allowed a high resistance connection and I presumed gave slightly inaccurate readings to the BMS. The lead wasn't too hot (I could still touch it) but since then I am getting a cell mismatch on charging.

     

    I have attached the log and the settings of the REC A BMS with my Eve LiFePo4 cells running in 840Ah bank.

     

    Could anyone please help with this strange behaviour, because after charging the batteries then settle back to balance charge as I would expect

     

    I have adjusted cell balance parameter start 3.45v down to 3.35v this will help cell 1, which never gets to the 3.45v balancing value. Not sure if this is right or not.

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  • P

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  • R

    it looks like your cells got out of balance when you had the loose connection.  LFP cells balance best when near the top of the range so put a trickle charger on it for a day or two and they should balance out.  If you need to do it faster you can manually balance them using some like an old incandescent bulb with a pigtail socket to bleed off the higher cells or disasemble the pack and put them all in parallel overnight

  • P

    @Rick Thanks for coming back. Will that cause problems if I carry on using them. I am leaving the boat and I need to decide whether to disconnect the batteries until I return?

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  • R

    Thats your call Phil, but if its for a short time and its connected to shore power or solar and your systems are working properly, it should balance itself out while youre gone.

     

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