![]() So, while our final parts list was bigger than we planned, we were confident we were doing the job right.Thank you 84 I appreciate your input. For the two new batteries, we looked to Odyssey for a couple matching Extreme Series 78-PC1500s that would fit into both the stock location and the factory-style auxiliary battery tray we picked up off eBay for a few bucks. Then we called up Powermaster Performance, because we knew it carried a 220-amp alternator that bolted right into the stock location and had the correct plug and pulley. To make it all work, we discussed our needs with Painless Performance, who recommended its weatherproof dual-battery control system, which consists of an extreme-duty solenoid and three-way switch along with all the other connections. Finally, Painless added 16-foot lengths of 1-gauge cable to cover all the cable we were adding or replacing. We completed the job in a couple afternoons and were soon enjoying the fruits of our labor, feeling confident this truck is one giant step closer to being the reliable off-road cruiser we envisioned form the beginning. Follow along and check out next month for what we think will be the final installment of Project Over/Under.Out of the factory, most vehicles only include one starter battery. Understandably, people often want to add a second battery. It could be for work lights, an audio system, a power winch, or even for the sake of having a backup. 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. They allow DC power to flow through the isolator, while forcing electricity to flow in only one direction. 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. Perhaps more importantly, ending up with the wrong detector could be more trouble than its worth. 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. Luckily, it’s not that tough to choose an effective 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. But for someone seeking a simple two battery solution, what you’re looking for is a dual battery isolator. Expanding beyond two batteries isn’t only prohibitively expensive, it’s totally unnecessary in most circumstances. 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. Isolation aside, different vehicles have different batteries. Different batteries have different needs. You want isolators rated to carry the amount of voltage and amperage you expect to draw. For the better battery isolators on the market, these typically range between 120A and 150A. Though you can find more powerful kits for niche scenarios, most people will be well-suited by almost any properly constructed battery isolator. Systems with more robust batteries should take advantage of equally robust supporting equipment. ![]() You’ll have to choose between diode isolators or relay isolators. Each have their own advantages and disadvantages. A diode isolator is positioned between your alternator and your batteries, and the built-in diodes let your alternator charge those batteries while keeping them both isolated from each other. That lets you connect with the secondary battery without having to discharger your starter. Moreover, installing a diode isolator is pretty simple because there are no moving parts. It’s almost as simple as placing the unit. Similarly, an isolator relay diode is also installed in a position between your batteries and the alternator.īut the heat sink for these types of units tend to be larger, and voltage drop among the diodes can lead to undercharging your batteries if you’re not careful. The relay switches on or off depending on the status of your ignition. These relays tend to be very small, and they don’t lead to voltage drop among your contacts. ![]()
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