I am charging a 230AH FLA bank in a motorhome with a Victron IP65 Blue Smart 15 amp charger. The Dekka batteries call for 15.0 to 15.3V for equalization. Whatever I set the charging voltage at I measure .3V less at the battery terminals. With the charger display showing that it is putting out 15.3V the reading at the batteries is only 15.0, is this normal and if so which voltage should I use when applying manufacturer's recommendations. The charging cord is 6 feet and it is AWG 12 copper. Am I seeing voltage drop due to the wire?