[Richard]

At the risk of sounding like a broken record, “listen to your batteries, they will tell you”. The trial that you ran where you looked at the batteries after 12 hrs, and they were at 13.4, tells me that the normal voltage at almost fully charged is 13.4. I would set the float at 13.4. Yes, I know BB’s recommendation is 13.6. You have already shown on your setup that value keeps the batteries at almost 100% SOC, and the system in perpetual charge state most of the time. BB may say their batteries are robust and can take it. My position is why take the chance. Other literature out there strongly suggests longer battery life if the steady state SOC is less that 90%. So it’s dealer’s choice on this one.

The downside is the battery bank rests at a slightly lower SOC, and if you want full charge for a longer term boondock, then you must go to Control and tell the charger to Absorb charge. The upside is a longer battery life.

My recommendations on how to set up the Lithiums are for pedestal to pedestal use, like we mostly do. There are more aggressive settings that a person wishing to stay off grid as long as possible would prefer.

My .02

Very very very clever idea on shutting off the breaker to the inverter to run a battery test trial and still have AC for the coach. Brilliant!