[bikestuff]

I have a Magnum inverter and their integrated BMK.  6 BB 100AH batts.  I set up the Magnum according to the BB recommendations.  My BMK says SOC is always at 100% and I rarely do any dry camping.

Although I found a mis-wired battery tender years ago....I have not really had any battery issues since then. The BBs just sit there and do their thing.

I am going to run Richard’s test soon and will document my results.

One thing to think about whenever playing with lithium  batteries and their settings.....  If you crank the coach with depleted lithium house batteries...the battery isolator will attempt to send current to the house batteries.  Lithium batteries have an almost unlimited ability to accept current.  This can easily overwhelm your isolator.  And when I say “overwhelm” I really mean completely melt.  In my coach I have the super big oil cooled alternator which can put out like 300 amps.  I think the isolator is rated at 200 amps.  If I drove off with empty house batts the alternator will do its job and keep sending current until the regulator tells it to stop.  There is no fancy charge limiting smarts in the Alternator / Isolator circuit.  (Some folks including Richard I believe) have disabled the ability of their alternator to charge their house batteries for this very reason.

What does this mean in the real world?  In practice it is good to make sure that you have charged your lithium’s using the inverters charge circuit before you crank the coach.    Don’t drive off with an empty house battery.  This will put maximum stress on the alternator / isolator./

Cheers,
Bill