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Dual battery isolator relay setup4/12/2023 ![]() Pros & Cons of a Dual Battery System Setup This is because deep cycle batteries are built to be repeatedly discharged and recharged without being damaged or shortening their lifespan.īy using a deep cycle battery to power your gear you can rest easy knowing you’ll have a consistent power supply and won’t risk damaging your battery by running it dry. Your auxiliary battery will most likely be a deep cycle battery. ![]() This is not the case with all isolators, however. The battery isolator will also ensure that both batteries charge properly.īe aware that some 4×4 dual battery isolators can allow your starter and secondary batteries to work together, boosting starting power to your vehicle should the starting battery suddenly drop in voltage. Keeping each battery functioning independently of each other is crucial in ensuring that your starter battery does not become drained and prevents your fourby from starting up. This is achieved thanks to the function of an isolator that disconnects your starter battery from your secondary battery, meaning that you only draw power from one battery at a time. While your vehicle is turned off, your secondary battery powers all gear and accessories attached to your vehicle meaning that you can run your portable fridge, lights, and inverters without having to keep your engine running. While your vehicle’s engine is running, your starter battery works with your alternator to power your vehicle and its electronics. In a dual battery system, both batteries function as two isolated systems. How Does a Dual Battery System Work? Image Source: RedArc ![]() A battery isolator automatically disconnects your two batteries when your car is off, so you can’t accidentally use power from your starting battery and potentially run it flat. The other requirement is a battery isolator. For a typical dual battery setup, you’ll want to connect your secondary battery to your starter battery, allowing you to charge both batteries from your alternator but this requires the appropriate wiring, via dual battery wiring kits. A dual battery system requires more than just a second battery though. This secondary battery is used as a power source for auxiliary gear and accessories.
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