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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