[folivier]

My 3 BBs normally sit at 13.5 floating. When I use lights or waterpump, etc. the inverter puts in just enough charge to keep them at that float voltage. When I unplug for the day or overnight and the voltage gets below that 13.5 then when I plug back in the inverter will start the charging cycle: 14.4 until it puts in the correct amount of amps (based on my SOC) then absorb for 90 minutes, then goes into float to keep them at 13.5. I'm using a Victron BMV-712 bluetooth battery monitor to see my SOC. But the inverter detects the amount of charge necessary.
I'd suggest you call Battleborn on Monday to discuss with them your inverter setup, I've found them very helpful.