Blue Seas has a very good ACR you might consider. The ACR is then tied across the battery banks with the appropriate size conductors and all else is automatic. There must be a fuse or breaker of suitable size, of course between the alternator and battery. Regarding alternators if you have single wire alternators which you should really step up to then that single wire can be directly wired to the battery terminal on the starter motor. The ACR's on the other hand close a relay when the potential difference is sensed and the battery being charged realizes the full charging potential. The down side is these isolators will not pass the full alternator voltage usually between 6/10 to 1 volt difference. The isolator will reach a breakdown threshold and allow current to flow from the higher potential to the lower potential. The isolators are an electronic device that senses a charge voltage as well as a battery requiring a charge. The isolator allows the other engine's alternator to charge the dead bank. Consider you are out and run one of the banks down and cannot get one engine started. Nominally, however the isolator is more or less a "backup" device which allows both battery banks to be charged from a single charge source like one alternator. BATTERY MATE VERSION A battery isolator as part of a charging system.Having a charger routed through an isolator is very unusual unless the charger was a single output and charging multiple banks.Mastervolt offers the Battery Mate series for use in installations where charge equipment cannot be adjusted. Mastervolt alternators equipped with the Alpha Pro charge regulator can be adjusted to the correct charge voltage so that the voltage drop is compensated for. If the charger is not fitted with the sense wires, a jumper or dip switch setting will have to be made to increase the voltage. and neg.), the voltage drop is automatically compensated for. In Mastervolt appliances with sense wires (pos. The (average) voltage drop for 0.7 V can be compensated for in different ways: 1. As there are no moveable parts there is no wear. Solid state - maintenance free Charging is done fully automatically once you have fitted the BI battery isolator. The Mastervolt battery chargers and alternator regulators are prepared to operate with traditional battery isolators, as this equipment offers easy accessible voltage adjustment to compensate the voltage drop. The battery isolator is ‘solid state’ and will therefore not wear. This aluminium profile has three or more diodes mounted inside it that isolate the charge current and prevent it recirculating. A more reliable option is to use a battery isolator. A downside to this method is that both batteries can become discharged at the same time. Before doing so, however, ensure the switch is fitted with a ‘dual’ mode. Manual switch versus battery isolator The advantage of a manual switch is that, if needed, the battery supplying the system can be parallel connected to the starter battery. Only when two or more banks have to be charged with high current, a battery isolator has to be fitted (75 A + 100 A optional). Almost all Mastervolt battery chargers come standard with two or three outputs. Although it is possible to select the battery source manually, using a battery switch, much better results can be achieved by placing a battery isolator in the positive cable connection from the alternator and/or battery charger to the various batteries. As a consequence the charge system is more complicated than in installations with only one battery: the alternator on the propulsion engine has to recharge all the battery sets individually and the same applies to the battery charger. 500004204 BATTERY ISOLATORS BI & BATTERY MATE Solid state and electronic battery isolators Multiple battery charging To prevent the starter battery and the batteries supplying the lighting and bowthruster from draining each other they should be kept separate.
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