Have lithium battery 120AH ( no canbus ) on Multiplus 48V /5 kVA and when monitoring the BMV 702 voltage there is a variation of about 0.1V yet there is no voltage variation on the VE Bus voltage. Seems like the internal voltage sens on the multiplus is not stable as it does not recognize thus voltage variation . There is also a 0.35V difference between the BMV 702 and the Multiplus. Can this be fixed?