Electronics > Beginners
Is there a way to safely charge a car battery with this equipment? If not, why?
Yansi:
Guess what: 27V just tells you those alternators are probably shot, as with 27V (13.5V) you are NOT going to charge the battery, especially during the typical couple of hours of motor run time. Understood? :-//
Simon:
:horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm: :horse: :palm:
T3sl4co1l:
Ah, well there you have it, I left the lights on last night :-DD so I've got it indoors charging right now. Taking a good 12.3A at 13.63V right now, slowly rising (max 14.20). Was about 12V OC, should be here most of the afternoon then I'll put it back good as new.
Tim
Simon:
shhhh don't tell Yansi you can charge with less than 14V, you will be on his naughty list too...
T3sl4co1l:
Well, so what? It's taking current at a lower voltage because it's in a discharged state. As the concentration of Pb-->PbO2 and PbSO4-->Pb rises, the cell potential also rises. (In fact it's up to 13.74V already.) When all surfaces are fully charged, the voltage levels off somewhere around there (when under some degree of charge, because again, overpotential). I'm going to float it at 14.2 for a while (preferably 12-24 hr, not sure if I'll get that much time on it tonight) to ensure a full charge (desulfation, to the extent that it can be performed at all).
Tim
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