BFL13 wrote:
I have always used the same voltage vs SOC at all ambient temperatures. Is that proper?
The AGM loses 15% capacity at freezing vs at rating temp of 77F, so is it still 13.0v when full? BUT at freezing temp, your charging rate of 14.8 is now supposed to be adjusted upwards to 15.2 volts to compensate for the cold. Voltage going opposite directions there maybe.
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Hi BFL13;
In support of temp-comp charging, I offer
link.
I also believe the electrolysis(bubbling/gassing) that is sought after by FLA users, is a waste of charging energy for AGMs, as there is no requirement to stir the electrolyte .I know AGMs are recombinant, but IMHO, that is a recovery process in the event of gassing.
A temp-comp charger should automatically charge faster/cheaper while avoiding electrolosis.
I have looked at the annual temp variance for BC. Your temps are influenced by the Pacific Ocean and do not vary widely like they do in Oklahoma, USA. I need temp-comp. My battery temps can vary 10C inside of 24hrs. I have graphs that show daily charge Volts decreasing automatically while charging is in progress. No set and forget knob twisting will do that.
HTH;
John
