I have a 24v domestic Lithium battery system and the Smart LiFePo4's have to dump a charge voltage to another battery. The starter battery is a 12v system so I have to carry two 12v LA batteries in parallel to allow this to happen. I would like this voltage to be regulated to a 12v charging voltage through a Cyrix battery combiner so it will charge the starter battery when the Lithium batteries are full. Hope you can Help