AGM vs Flooded Bulk Times
PT keeps asking whether AGMs will spend more time in Bulk at the same charging rate. I found a good example where that can be measured, using ah64id's test with his PD4655 on his pair of Lifeline...
Forum Discussion
Thanks for the clarification. So that confirms the 49% start I think.
Using 110 instead of 125 and ignoring heat loss (shouldn't be much in mid-SOCs) we get:
108 + (25 min at 110) 46 = 154/220 = 70% SOC at start taper/begin absorption stage with a 50% charging rate (110/220)
That compares with the other guy's 77% with an 18.7% charging rate. So that works where you should have same Vabs reached at a lower SOC by using a higher charging rate.
It is also higher in SOC than you would expect with Wets. But the other guy's came out the same as with Wets in the data I have. I think we should have more examples.
Ideally, testing doing the recharge should be with no load on the batteries to confuse things. I know the Trimetric just records the amps that actually go into the battery, but I am nervous if the results would come out right with the battery sucking and blowing at the same time. Also, note the Trimetric AH count on recharge has a 4% allowance for heat loss built in.
EDIT--stray thought! It looks like AGMs don't get that huge spike in initial voltage on a recharge. So that should help with those WFCO converters that need to see under 13.2 in order to go into boost? Solution for frustrated WFCO owners is to swap over to AGMs? :)
Using 110 instead of 125 and ignoring heat loss (shouldn't be much in mid-SOCs) we get:
108 + (25 min at 110) 46 = 154/220 = 70% SOC at start taper/begin absorption stage with a 50% charging rate (110/220)
That compares with the other guy's 77% with an 18.7% charging rate. So that works where you should have same Vabs reached at a lower SOC by using a higher charging rate.
It is also higher in SOC than you would expect with Wets. But the other guy's came out the same as with Wets in the data I have. I think we should have more examples.
Ideally, testing doing the recharge should be with no load on the batteries to confuse things. I know the Trimetric just records the amps that actually go into the battery, but I am nervous if the results would come out right with the battery sucking and blowing at the same time. Also, note the Trimetric AH count on recharge has a 4% allowance for heat loss built in.
EDIT--stray thought! It looks like AGMs don't get that huge spike in initial voltage on a recharge. So that should help with those WFCO converters that need to see under 13.2 in order to go into boost? Solution for frustrated WFCO owners is to swap over to AGMs? :)
