Deep cycle battery meter8/5/2023 ![]() ![]() ![]() These designs can accommodate only one charge voltage, and therefore must use a compromise setting - typically 13.8 volts. Most battery charger designs and standard alternators installed on boats cannot deal with the conflicting voltage requirements of the initial "bulk charge" and subsequent "float" or maintenance stage. Higher voltage levels will "gas" the battery and boil off electrolyte, again shortening battery life. Once fully charged, marine batteries should be held at a considerably lower voltage to maintain their charge - typically 13.2 to 13.4 volts. Over time, these deposits will cause a 200 amp-hour battery to act more like a 100 amp-hour battery, and battery life will be considerably shortened. (For 24 volt systems, double these figures.) If taken to a lesser voltage level, some of the sulfate deposits that form during discharge will remain on the plates. The accumulation of such deposits, otherwise known as sulfation, is the most destructive process in the life of any lead-acid battery.Ī typical 12-volt lead-acid battery must be taken to approximately 14.2-14.4 VDC before it is fully charged. As this barrier becomes thicker and thicker, the battery's ability to accept a charge or deliver energy is diminished, resulting in the perception that the battery is no longer usable. If, however, the battery is left in a partial state of discharge for as short as 3 days, the lead sulfate material will begin to harden and crystallize, forming a permanent insulating barrier. During the battery's recharge, this material is lifted off the plates and recombined into the battery's electrolyte solution. When a lead-acid battery is discharged, a soft lead sulfate material forms on the battery plates. The following information is designed to tell you how to get the longest life possible from your battery bank and also why batteries fail. As someone in the industry once put it, "few batteries die a natural death, most are murdered".
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