Do you have flooded lead acid batteries? When is the last time you’ve checked the water level? It sounds like your converter is stuck in bulk charging mode which is overcharging the batteries. You’ll need a basic digital multimeter to check the charging voltage.While going on a walkthrough of our Montana Legacy we noticed a smell and found out the batteries were hot to the touch and could smell battery acid, any idea what could cause this to happen. We have replaced the batteries.