[folivier]

Found the shunt for the inverter in the engine compartment. The shunt for the Victron battery monitor is at the LiFePO4 batteries. That explains the 0.4 volt higher reading from the inverter.
Now, should I try to move the inverter shunt to the battery which will entail reconnecting the negative wires where it was and moving the sense wires to the new location? I should be able to just connect all of the negative cables together to a new stud into the frame?
Or, just try and trick the inverter to give me a higher charge voltage?
When not charging and running the inverter both voltages are only a few tenths of a volt different. Keep in mind the only voltage that matters is at the batteries where the BMS is sensing the voltage. I'm not using the inverter for any controls.