If you have an auxiliary battery that powers electronic devices, it can be damaged by voltage spikes from the alternator. Avoid Voltage SpikesĪnother reason to use a battery isolator is to protect your batteries from voltage spikes. Another example would be if you have a deep cycle battery that you use for camping or running appliances, and you don’t want it to drain your main battery. Having an isolator can be useful, for example, in your vehicle if you have to stop and start it multiple times a day, so you don’t drain your starter battery. It also allows you to have an auxiliary battery powering other moving parts in the vehicle, such as the stereo or the power inverters that charge your portable devices that you plug into your car. The reason for this is that, if you allow both batteries to equal out their electrical current (giving you low power on each), you might not be able to start your vehicle’s engine. An isolator will allow the alternator to charge the starter battery while also protecting that battery’s current so that it doesn’t unnecessarily travel to any auxiliary loads that aren’t fully charged. The most common reason to install a battery isolator is to prevent the secondary batteries from draining the starter battery. We alluded to some of these reasons already, but let’s look at them in more detail here. There are several reasons why you might want to install a battery isolator in your vehicle. The diode battery isolator is the most commonly used, so that is the one we will discuss in this article. Diode battery isolators, on the other hand, are less complicated and have a longer lifespan, using only two high-current diodes on the isolator to get the current to move to the battery. It utilizes many relays to manage the electrical current. The solenoid battery isolator is a bit more complicated. There are two kinds of battery isolators: solenoid and diode. You can even get smart isolators that are microprocessor-controlled. Not only does a single direction of current prevent the batteries from draining each other, it also protects the batteries from being damaged by voltage spikes, which we will discuss in more detail later. It does this by using a series of diodes that only allow current to flow in one direction. Said in another way, it is a device that lets you charge multiple batteries from one alternator. A battery isolator is a device that prevents electrical current from flowing between two batteries.
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