Forum Discussion
KendallP
Sep 13, 2013Explorer
As I said... this is an oldie. Here's a canned response I found in my rv.net folder. Note the real data from 2 typical RV converters charging an actual Lifeline...
I have yet to see any test results on an AGM that when charged at any fast rate with a typical converter at say 14.4V or so... doesn't begin to force the amperage to taper long before 90% SOC.
Here's one that is being charged at about C/2. The IOTA dropped out of boost at 15 minutes or so, but notice that the Amps still begain to taper at just 10 minutes in. These are typical RV converters. This is how a Lifeline reacts to them in real life. Even at C/2 it took over 2 hours to go from 40% to 90%. The IOTA took 2 1/2 hours.
(Below the Lifeline chart is BFL13's infamous "ugly graph" that shows it took 129 minutes to do a 50-90 on a pair of 6V GC2s at only C/3. And as we all know... the 40-50% portion of the charge is definitely the easy part. It only added about 10 minutes. So the speed winner here is actually the GC2s. At best it's a draw... even at a slower charge rate for the GC2s.)
(And at the bottom of the page is Fisherguy's graph. 2 hours or maybe 2:15 to do a 47-90 at C/3 using another typical converter.)
BFL13's Ugly Graph
I have yet to see any test results on an AGM that when charged at any fast rate with a typical converter at say 14.4V or so... doesn't begin to force the amperage to taper long before 90% SOC.
Here's one that is being charged at about C/2. The IOTA dropped out of boost at 15 minutes or so, but notice that the Amps still begain to taper at just 10 minutes in. These are typical RV converters. This is how a Lifeline reacts to them in real life. Even at C/2 it took over 2 hours to go from 40% to 90%. The IOTA took 2 1/2 hours.
(Below the Lifeline chart is BFL13's infamous "ugly graph" that shows it took 129 minutes to do a 50-90 on a pair of 6V GC2s at only C/3. And as we all know... the 40-50% portion of the charge is definitely the easy part. It only added about 10 minutes. So the speed winner here is actually the GC2s. At best it's a draw... even at a slower charge rate for the GC2s.)
(And at the bottom of the page is Fisherguy's graph. 2 hours or maybe 2:15 to do a 47-90 at C/3 using another typical converter.)
BFL13's Ugly Graph
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