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I have LiFePo 4 batteries in my motorhome. I had to change my BIM, Battery Isolation Manager) to a Li-Bim 225 BIM. This will cycle the charge from the alternator on 15 minutes and off 30 minutes. I have a 220 AH alternator on my diesel pusher. If it doesn't cycle, the alternator will overheat...

You must have a Battery Isolation Manager (BIM).