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Many on board installations consist of two or more batteries which supply power to 12 or 24V equipment separately from each other. Naturally, this means that the charge system also has to be divided. This makes a charger system more complicated because either the Mastervolt alternator or battery charger will have to recharge the batteries individually.
Best and safest results can be achieved by using a high-quality Mastervolt battery isolator for the tailored supply of charge current to several batteries. This reliable solution allows simultaneous charging of two batteries from an alternator and/or battery charger without connecting the batteries together. Because of this the charge current becomes isolated, meaning it is prevented starter batteries and the ones supplying the lightning and bowthruster drain each other while output is optimal.
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The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts, the VSR engages, allowing two battery banks (start and house) to be charged simultaneously. When the voltage drops below 12.8 volts (eg the engine is stopped), the VSR disengages, separating the batteries. This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spikes.
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