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 ...
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Very interesting graphs. (Not at all ugly either! :) )
I do wonder about the charging graph's SOC plot though. It seems to be showing about 5% too high an SOC at that 65 minute point, compared with what I have seen with my recharges.
Perhaps there is a different allowance for heat loss?
I also can't reconcile your battery acceptance rate of 20 amps at about 95 minutes at "90%" SOC at 14.2 volts with my "marker" of 5 amps per 110AH at 14.5v, which would be 9.5 amps for 208AH, and less than that at a lower voltage (14.2 vs 14.5)
That would also make your 50-90 take about an hour and a half, which is about a half hour too soon, based on what I have seen.
So either the SOC plot there has something wrong with it, or there is more to be learned here about this. (My "marker" works out right cross-checking with the Trimetric AH counter, so it is not "wrong"---the thing to figure out here is what is making the difference)
"The AH returned" plot on this graph is linear, which would keep the SOC percentage lower than the SOC plot in the above graph.
http://www.engineersedge.com/battery/specific_gravity_battery.htm
For sure the drop from 14.6 battery to 14.2 has less of a drop in amps than dropping from 14.6 to 13.6 does. 13.6 means twice the amps drop.
I do wonder about the charging graph's SOC plot though. It seems to be showing about 5% too high an SOC at that 65 minute point, compared with what I have seen with my recharges.
Perhaps there is a different allowance for heat loss?
I also can't reconcile your battery acceptance rate of 20 amps at about 95 minutes at "90%" SOC at 14.2 volts with my "marker" of 5 amps per 110AH at 14.5v, which would be 9.5 amps for 208AH, and less than that at a lower voltage (14.2 vs 14.5)
That would also make your 50-90 take about an hour and a half, which is about a half hour too soon, based on what I have seen.
So either the SOC plot there has something wrong with it, or there is more to be learned here about this. (My "marker" works out right cross-checking with the Trimetric AH counter, so it is not "wrong"---the thing to figure out here is what is making the difference)
"The AH returned" plot on this graph is linear, which would keep the SOC percentage lower than the SOC plot in the above graph.
http://www.engineersedge.com/battery/specific_gravity_battery.htm
For sure the drop from 14.6 battery to 14.2 has less of a drop in amps than dropping from 14.6 to 13.6 does. 13.6 means twice the amps drop.
