How to boost charge AGM batteries in storage?
The manual for my Lifeline 100 Amp Hour Deep Cycle AGM 12 volt batteries says this: "While in storage, batteries should be boost charged every 90 days or when open circuit voltage drops to 12.5 vol...
Forum Discussion
MEXICOWANDERER wrote:
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Weekly application of temp compensated 14.4 volts constant for 2 hours each would approach ideal numbers. Temp compensation would be important.......
I use temp compensation. Even so 14.3 or 14.4 nominal volts and 2 hours typically leaves me a long way short of 0.5%. In fact if I start with batteries at about 75%, after bulk, I can hold the absorption for 2 hours and am still pulling about 3% amps. I called Lifeline and discussed this without any resolution or new information. I typically need to maintain 14.3 volts for at least 4 hours to get below 1%. That is with relatively new batteries. Since I am using solar, an interruption with a passing cloud or some shade will greatly prolong the absorption charging time. Sometimes it seems that even a brief interruption results in the need for another hour of absorption charging.
The whole process just seems weird and exceedingly slow.
