![]() ![]() Each have their own advantages and disadvantages. You’ll have to choose between diode isolators or relay isolators. Systems with more robust batteries should take advantage of equally robust supporting equipment. Though you can find more powerful kits for niche scenarios, most people will be well-suited by almost any properly constructed battery isolator. For the better battery isolators on the market, these typically range between 120A and 150A. You want isolators rated to carry the amount of voltage and amperage you expect to draw. Different batteries have different needs. Isolation aside, different vehicles have different batteries. Seemingly simple features, like start isolation, can ensure that your sensitive electronics won’t be subjected to the kind of sags in voltage that may occur when engine cranking happens. Expanding beyond two batteries isn’t only prohibitively expensive, it’s totally unnecessary in most circumstances. But for someone seeking a simple two battery solution, what you’re looking for is a dual battery isolator. If you’re planning on running a giant battery bank, filled with hundreds or thousands of batteries, then you’d need a pretty impressive isolator. Luckily, it’s not that tough to choose an effective battery isolator. You don’t want your battery isolator to cause problems with your vehicle’s electrical systems, or with the devices connected to whatever local grid you’re working on. Perhaps more importantly, ending up with the wrong detector could be more trouble than its worth. Choosing the Right 12V DC Dual Battery Isolator That way, when one battery in your bank is drained, it won’t end up pulling current from another. They allow DC power to flow through the isolator, while forcing electricity to flow in only one direction. If you’ve ever entered your car on a cold night, and felt relieved when your engine actually turned over like it should, the component you need to thank is probably a battery isolator.Ī good battery isolator works as a kind of rule-enforcer for battery systems. It could be for work lights, an audio system, a power winch, or even for the sake of having a backup. Understandably, people often want to add a second battery. If you need to do this regularly you can place a Battery Doctor® switch inline with the earth wire which can be then used to turn disable the isolator.Out of the factory, most vehicles only include one starter battery. If you need to disable the dual battery system, this can be achieved by disconnecting the auxiliary battery or disconnecting the small black earth wire from isolator to the chassis. Since the Isolator is fully automatic there is no way to turn the unit off. It is recommended that when charging the starting battery, the Auxiliary battery is disconnected or the isolator is disabled. This is not an ideal way to fully charge the batteries. When charging the starting battery the isolator will automatically connect the auxiliary battery when the starting battery reaches 13.4V (about 75% charged) and will then be charged also. You can charge the auxiliary battery with a battery charger without affecting the battery isolator at any time. Can I use a charger to recharge my batteries with a Dual Battery System?A. The isolator has in-built surge suppression and over-current protection for extra safety. In fact the isolator itself has a small microprocessor that intelligently controls the charging. The battery isolator has been designed to work with all vehicles, especially new vehicles with onboard computers. Is the battery Isolator safe to use with modern ‘electronic’ vehicles?A. To protect the cable from the auxiliary battery an inline fuse or fused battery terminal is needed. The battery isolator has inbuilt over-current protection which will protect the cable from the starting battery. Since a dual battery system contains two batteries connected together, the cabling needs to be protected for short circuit at each battery. 12V batteries can produce large amounts of power and are capable of melting cable insulation in the case of a short circuit. Why does the positive cable from the Isolator to the Auxiliary battery need to be fused?A. Direct high pressure washing of the battery isolator (or if the vehicle is submerged for a period of the time) may cause some water damage and this will not be covered under warranty. Normal use, including river crossings and light engine washing, should not pose any problem. No! Battery isolators are designed to be dust and shower resistant (water-resistant). ![]()
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