The only time you use a battery isolator is in motor homes or boats. A battery isolator is a one way electrical device that allows an electrical current to flow in one direction but not the other.
Canadian Energy Battery Isolator 101 Youtube
What does a battery isolator do. Battery isolators are hard on alternators because they have a voltage drop within the isolator and they are restrictive to current flow so your alternator has to power that voltage drop and resistance. This is very useful in keeping the battery that you run your boat with fully charged while out on the water especially if you have a lot of battery powered items on board your boat. Provided the alternator is sufficiently sized there is not much of a problem when the vehicle engine is running. These switches transfer batteries without reconnecting your wires each time you drain one battery. The problem of not isolating batteries. The diode battery isolator the diode type battery isolator uses semiconductor diodes to split the current from the alternator or generator and charge 2 or more batteries at the same time.
Installing a battery isolator in your vehicle allows you to use two or more car batteries for different purposes. Some vehicles take advantage of this extra electrical capacity to sustain a 2nd onboard battery. A battery isolator typically is used in situations where multiple batteries are required and its primary purpose is to ensure that the failure of a single battery will not incapacitate an entire electrical system. Battery isolators are commonly used to maintain the starting battery charge while using a second battery to power accessory items sound systems refrigeration emergency lights computer equipment etc eliminating the fear of having a dead battery when trying to start the engine. One battery is used to start the engine and the other is used to run the accessories. What does a battery isolator do an automotive electrical system produces enough electrical power for an automobile to run the ignition system charge the battery again and supply power for electronic devices inside the vehicle.
A battery isolator is a one way electrical battery that allows an electrical current to flow in one direction but not the other. A battery isolator is an electrical device that divides direct current dc into multiple branches and only allows current in one direction in each branch. Choosing battery isolators can be a daunting task for the uninitiated. The primary benefit of such an arrangement is the ability to simultaneously charge more than one battery from a single power source eg an alternator without connecting the battery terminals together in parallel. A battery isolator typically is used in situations where multiple batteries are required and its primary purpose is to ensure that the failure of a single battery will not incapacitate an entire electrical system. Simply put the battery isolator allows this charging to occur while keeping the house devices from accidentally discharging the starting battery.
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