![]() ![]() A pressure release valve keeps their internal pressure at a slightly positive level, but they can release excess pressure if needed. They self-discharge at only 3% per month, handle the highest number of lifetime charging cycles, and are maintenance free, spill-proof, submersible and leak-proof. Gel Batteries: Sealed Valve-Regulated (SVR) gelled-electrolyte batteries offer advantages over regular flooded batteries. Long life, a low 3% self-discharge rate and outstanding performance make AGM batteries excellent dual-purpose batteries for boaters who require the fastest recharging, quick starting power and reliable deep cycle ability. High-density AGM batteries have lower internal resistance, allowing greater starting power and charge acceptance, up to 40% of the battery’s total capacity, and quicker recharging than other types of deep cycle batteries. In addition to providing equal saturation across the entire surface of the battery’s positive and negative plates, the fibers in the dense glass mats embed themselves into the plates’ surface like reinforcing rods in concrete, providing more plate support and better shock and vibration protection than in conventional batteries. During charging, precision pressure valves allow oxygen produced on the positive plate to migrate to the negative plate and recombine with the hydrogen, producing water. These high-performance styles include gel batteries, Absorbed Glass Mat (AGM) and different chemistries of lithium-ion batteries.ĪGM Batteries: Sealed Valve-Regulated AGM batteries feature fine, highly porous microfiber glass separators compressed tightly between the battery’s positive and negative plates, which are saturated with just enough acid electrolyte to activate the battery. There's a good video there too.Newer styles of marine batteries are sealed and do not require you to ever add distilled water. I don't want to hijack this thread going off on a state of charge tangent, but take a look at the link below for that Oasis battery, which if you scroll about halfway through has a couple of links to some independent tests by Compass Marine for Practical Sailor, and Nigel Calder who is like a God in the marine electrical world tested the shit out of them as well. Batteries have a hard time living a long time when just discharged to 50%, which is around 12.3VDC. There's nothing out there that can compete with that battery when it comes to true deep cycling, and it's important to understand how crucial it is for a battery to recover from a deep state of discharge. If you want the absolute best, look at the Firefly Oasis, which is a Carbon Foam AGM. Odyssey is also worth mentioning with their TPPL (Pure Lead) 31M battery. Lifeline makes an excellent group 31, the GPL-31XT. These are calcium based lead, and I would consider to be the best value in AGMs. West Marine uses East Penn for their AGMs, AKA Deka. Make sure you're going with a very good battery manufacturer. Yours is a combination of both, so you have a heavy duty 12V bank with four 6V T105s.įor anyone who is looking to go the Group 31 route on a house bank, super important you don't get a cranking battery. Connect in parallel, voltage stays the same but Ah capacity increases. The way it works with series/parallel is if you connect in series, the voltage doubles but Ah stays the same. Some might have a lower CCA and higher Ah, but what you have is like the equivalent of two 8Ds in parallel. With FOUR of those batteries wired for 12V, each battery being 6V Ea at a 225 AH, you'd have a total of 500 Ah capacity. ![]()
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