Woo Hoo..New AGM Batteries
two of the new ones in their workplace, the battery rack last night 7:30pm meter 12.93v lights and fans running this morning 6:30 am (early for us) 12.62v down 65ampHrs from full i set th...
Forum Discussion
About 90-92% for many but not all.
One of the more "misunderstood" and rote misguided theories of amateurs is that somehow bulk charging 14.4 volts needs to be defeated to "float" immediately.
HORSE
PUCKY
An AGM battery can tolerate 14.4 volts (temperature corrected) FOR HOURS and not be damaged.
When an AGM fills to capacity they do not act like a flooded battery
AGM amperage drops to almost zero.
Battery lifespan suffers to a minor degree with continuous MINOR LEAGUE overcharging.
But please address the FACT (not hyperbole, hearsay or fiction) that tens of thousands of AGM batteries routinely "suffer" automotive charging system voltages and underhood temperatures of 150 degrees plus. Please look. Please find. Please post an AGM battery manufacturer's SUGGESTION that their absorbed glass mat battery must not be used for automotive under hood use. Automotive and diesel truck alternators do not have a float setting.
The point is...
Allow the AGM to achieve FOURTEEN POINT FOUR VOLTS
Allow the amperage to droop to ONE PERCENT of rated amp hour capacity
This is as close of a "Fully Charged" formula as you will ever get.
Please avoid comments that border on the absurd like incredible voltage levels combined with unbelievable temperatures. If you relish permutations refer to a thermal/voltage graph.
Someone commented on a 4 ampere constant charge rate for a 10-ampere AGM battery. Snide comments. Ignorant comments. I know of NO absorbed glass mat battery that cannot safely accept a 40% of total amp hour charge amperage that does not exceed 14.4 @ 25c temperature compensated volts. God almighty, the Lifeline group 31 safely accepts NINETY AMPS charge rate. All font on a forum looks the same - beware.
One of the more "misunderstood" and rote misguided theories of amateurs is that somehow bulk charging 14.4 volts needs to be defeated to "float" immediately.
HORSE
PUCKY
An AGM battery can tolerate 14.4 volts (temperature corrected) FOR HOURS and not be damaged.
When an AGM fills to capacity they do not act like a flooded battery
AGM amperage drops to almost zero.
Battery lifespan suffers to a minor degree with continuous MINOR LEAGUE overcharging.
But please address the FACT (not hyperbole, hearsay or fiction) that tens of thousands of AGM batteries routinely "suffer" automotive charging system voltages and underhood temperatures of 150 degrees plus. Please look. Please find. Please post an AGM battery manufacturer's SUGGESTION that their absorbed glass mat battery must not be used for automotive under hood use. Automotive and diesel truck alternators do not have a float setting.
The point is...
Allow the AGM to achieve FOURTEEN POINT FOUR VOLTS
Allow the amperage to droop to ONE PERCENT of rated amp hour capacity
This is as close of a "Fully Charged" formula as you will ever get.
Please avoid comments that border on the absurd like incredible voltage levels combined with unbelievable temperatures. If you relish permutations refer to a thermal/voltage graph.
Someone commented on a 4 ampere constant charge rate for a 10-ampere AGM battery. Snide comments. Ignorant comments. I know of NO absorbed glass mat battery that cannot safely accept a 40% of total amp hour charge amperage that does not exceed 14.4 @ 25c temperature compensated volts. God almighty, the Lifeline group 31 safely accepts NINETY AMPS charge rate. All font on a forum looks the same - beware.
