Good day, I have the Esner 3kw inverter, my concern is that the battery float voltage stays at 28.2 volts although the inverter setting is at 27.2 volts. I have lowered the float voltage to 26 volts but batteries still stay at 28.2. There are 2x lifpod4 25. 6volt 100 amp hour batteries in the system. Is this normal?? Thank you.