Some cool battery graphs
I'm checking out the Costco GC2 batteries and Iota 55A converter as well as the new 16-bit a/d for Arduino. Prior to discharging the 208AH GC2 batteries, they were top charged with 16V for about ...
Forum Discussion
Salvo wrote:
I think one can assume 100% AH efficiency below the gassing voltage. And efficiency drops when greater than 75% SOC. Efficiency should be close to 0% at 100% SOC.
Of course the energy efficiency is much lower.BFL13 wrote:
So you are claiming 100% charging efficiency????
Trimetric user's manual says Trojan wet cells were tested, and showed 95-98% charging efficiency below gassing voltage. Above gassing voltage of course efficiency is less. Trimetric chose 94% setting for their default average, but you can adjust that if you find it isn't quite right for your own batteries.
I did not change my Tri setting of 94% so I may be getting a tad higher in SOC earlier on, than my graphs show, which explains the 5% I think your SOCs are too high. It would seem that they are too high but not by that much. Maybe 3% too high? Something anyway.
Gassing voltage at 20C is about 14.4 ISTR, ( It is lower at 25C) so you should apply some heat loss towards the end of even the bulk stage going to 14.6, and then more after that.
