How a Battery Isolator Works How a Battery Isolator Works

Battery isolator is a device that splits direct current into many branches and allows the electric current to flow in only one direction through each branch.

Why Use a Battery Isolator?

The advantage of such arrangement is the ability of charging many batteries at a time from a single source without a parallel battery terminal connection. The battery isolator has a sensor that helps to estimate the number of connections and the strongest battery to draw the power from. The disadvantage is its cost and complexity. These battery isolators are commonly used on recreational vehicles, utility vehicles, boats, large trucks, airplanes where one battery is used to start and run the engine, and the other is used to run the accessory loads like winches and instruments. The basic purpose of the isolator battery is to ensure that the whole power system does not become handicapped due to a single battery failure.


To provide the vehicle access to the power backup source, the battery isolator keeps the multiple batteries separate from each other. The battery isolator also keeps the vehicles batteries from pulling power from many batteries at a time which might completely drain all the batteries and lead to an electrical system failure. The battery setup in the vehicle consists of two batteries connected to the isolator. The isolator is connected to the vehicle's alternator. Alternator is a device that provides the vehicle with electrical power to charge its battery. The alternator charges the idle batteries and if the active battery fails, the isolator switches the power source. 



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