voltage drop
how much voltage drop is normal for a agm 12v battery or any battery if it is fully charged and connected to nothing?
Forum Discussion
full_mosey wrote:MEXICOWANDERER wrote:
Don, the Lifeline factory manual claims a 31 rated at 110 ampere hours can safely swallow a 500 ampere charge rate. This is what is giving me the willies with those cheapowatts, not a misprint here, the text reads five hundred amperes, 500% of 20 ampere hour rate,
Isn't that is where a temp-comp charger is needed? Doesn't that allow the charger to automatically monitor battery temp and control Voltage?
Why would there be any need for 'the willies' whith an automatic temp-comp charger?
Optima says their batteries can be charged with unliminted current at 15.6V so long as the battery is held under 125F until the charge rate reaches 1A. Isn't that a prescription for a temp-comp charger? What that says to me is that if the temp reaches 125F, the charger should automatically reduce Volts to maintain 125F and that would determine the actual current limit.
HTH;
John
John I hate to admit this but a temperature compensated charging device that can restore a 31 Lifeline to full charge in 2-hours is out of my league. The first of the ordinals is to recharge the battery - fast. This is not elective. When the power goes off -again- after 2 hours, that may be "it" for the day. Maybe 2-days. Again, when I am at home this is not an issue. When I am "here" and my generator is a 2,000 mile drive, or when I am in a hotel room, then things become sensitive. I am thinking of an audible temperature alarm to be pasted onto one of the battery posts. The CheapOWatts cannot be driven in excess of 350 watts. So this leaves me with no choice but to use "enough" 22 dollar units to saturate the battery to 14.2 volts instantly. This will keep the per unit wattage under the maximum tolerated wattage. Yes I could use a MeanWell. And after 2 hours end up with a battery not charged. There are times when 90% battery depletion is going to occur. As long as I can use the BiPAP this does not pose a problem. I do not appreciate the effects of atrial fibrillation. Cannot drive, and hard to impossible to walk.
Yep, this is a tough row to hoe, but the famous quote from my cowboy uncle keeps coming to mind: "Sonny, ya gotta be smarter than the problem"
