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1

This really does depend on the "12V" equipment. If it's designed for automotive use, or motorhome/RV or marine use, it'll be designed with car batteries in mind, and generally tolerant of 15V or so while the battery's charging - as well as the sort of voltage spikes sometimes seen in a car. Plus, DC motors used in pumps and such are pretty robust ...


2

Supplementary: With lead acid, for more than terrible cycle life, depth of discharge should be limited. For really long life even with deep discharge rated cells a DOD (depth of discharge) of only 30% may be used (30 Ah available per 100 AH of capacity). More than 50% DOD is getting marginal and beyond say 70% DOD is very hard on LA cells. LiFePO4 cells are ...


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Charging a lead-acid batteries is rather complex matter. First, the safety: Even a discharged car battery can output enough current to melt your wires and/or start a fire and/or burn your hands, if you make a small mistake and short the battery. An over-charged, over-discharged or simply damaged battery may produce hydrogen. It is explosive when reaches ...


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What you are currently doing exactly opposite of what the article you linked to suggests charging lead-acid batteries. The article says to use CCCV method which means constant current constant voltage. It means that the charger first limits the charge current to constant predefined level and the charging voltage is at the battery voltage level, until the ...


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