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hey guys welcome to boating tech talk    i'm jake one of the technicians here    with pys we have a question from sean    who says i watched your video about    charging multiple battery banks from an    alternator i have a similar setup i have    one alternator three lead acid for    starting two lithium per house and a one    by three isolator what role does the bms    in lithium play i thought the bms was    supposed to manage charge rate temp and    discharge is this wrong    battleborn lithium batteries are pricey    and i don't want to screw them up thanks    for the question sean and that is a    great setup that you have    the role that a bms in lithium battery    plays is    managing the cells inside the battery so    that we can utilize lithium technology    in a safe way on our boats    so    they're actually going to be    monitoring what's coming in and out of    the cells    so that the rate coming in and out is    safe and that we don't do damage or    overheat or that we're not overcharging    for example at low temperatures    one other thing to consider with a bms    is that it is not controlling these    things it is there as a safety measure    at the end of the day that if it is    being overcharged or undercharged    it will disconnect them to make sure    that your boat stays safe    one thing with having a isolator in a    lithium system is that your alternator    configuration    would need to be set up for either lead    acid    or for lithium charge profiles but it    can't do both    so instead of an isolator you may want    to consider choosing    connecting the alternator directly    either to the lithium house battery with    an external regulator    and surge protector or to your lead acid    starting batteries and then sharing that    charge either way through a dc to dc    charger    thanks for watching boating tech talk if    you do have any other questions please    send them in and also check our youtube    channel for answers to any others that    you might have