- I have a system in a boat where I will be installing lithium house battery system. I want to charge house with stand alone 12v Alternator on one engine. Other engine 24v for starting system. My question is I want to use 2 Orion smart dc to dc charger to keep Alternator amperage in check with the lithium installed. However what happens if the battery bms disconnects on the load side of the dc to dc when fully charged, will the Alternator also see an open and fry the Alternator. I have no other start battery connected to the system. Stand alone Alternator for charging house. Will the Orion provide enough load as to not have Alternator see an open. Not using battery with external bms