I am replacing my sailboat AGM house bank with lithium. I plan to use an Orion XS or Tr DC-DC charger to throttle the lithium charging current and keep the alternator from overheating. The circuit now has an Argofet battery isolator that keeps the engine and house batteries from feeding into each other. I need to keep the engine lead-acid/AGM battery in the circuit to act as a buffer/capacitor to absorb alternator current in the event the lithium BMS suddenly disconnects its batteries. Should I keep the battery isolator in the system? If so, the new charger would be connected between the isolator and the LFP house bank, and the engine battery would still be connected through the isolator to the alternator. Should I take the isolator out and connect the engine battery directly between the alternator and the new charger? Does it make any difference?
Remove the isolator, run alternator to the start battery, and Orion XS between start battery and house bank, done!
Thanks. That’s where I was headed but wanted reassurance from someone smarter on this subject than I. I appreciate it very much.
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