AGM vs Flooded Bulk Times

jharrell wrote:
It does help though at least with my Lifelines that they can take as much charge rate as you want in bulk. My Magnum can do 125 amps and my two 220Ah 6V can take that easily vs my old wet cells at ~40 amps.

For comparison, the initial amps amount like 125 amps isn't the point as such. But it is interesting in its own right for how long the bank can accept 125 AH constant amps from what starting SOC before amps taper at what battery voltage, to see what the SOC is when the 125 amps start to taper.

At 125/220AH that is a 56.8% charging rate. I would expect the 125 amps to start tapering (begin absorption stage) at quite a low SOC--maybe 55% as a WAG? Any data on that?

My tests have the Wets tapering at 65% using 70 amps on a 220AH bank, which is 70/220 = 31.8%

Mex likes to charge his batts with such a high rate that they do not have a constant amps bulk stage at all. They go straight into absorption. Of course that would depend on what the SOC is at the start. If you exploit the way AGMs can tolerate a deep DOD by starting the recharge at 30% SOC, you could have some time at 125 amps before reaching the SOC at which they start to taper.

If the "old wets" would only accept 40 amps at 50% SOC start, that seems a tad low for amps. Say those were 85AH 12s, then that would be 170AH and 40/170 = 23.5% charging rate. That would have them start tapering from 40 amps constant at about 73% SOC, so they should have been able to accept way more than 40 amps at 50% SOC.