Another AGM conditioning question
This is my chassis battery, an agm I got used and have little experience with. Trickle charger failed in storage, it is dead as a doornail. Not covenient to babysit it for long hours on meanwell or...
Forum Discussion
While I observed the Screwy31 closely, I was using the hydrometer, not amperage at absorption voltage, as a determinant when the battery was full.
I do recall using amperage at EQ voltages as a determinant when to stop EQing, after many EQ cycles where I did dip the hydro and look at the Amps the battery was accepting.
But I do not recall doing the same thing at absorption voltage. Mostly the Screwy31 was a downward trend in SG each and every cycle, and higher absorption voltages held longer just slowed the SG walk down, and reduced the time required at EQ voltages for it to max out again.
I find amperage at absorption voltage, while perhaps not quite as precise, but with no other option with AGM, other than blindly trusting the untrustable amp hour counter, to be quite enlightening, and the time to 0.5% of capacity, from when absorption was reached, to the time it tapered to that threshold, to make things quite obvious as to what was going on as the cycles accumulated, and how they varied when larger charging sources were applied and after they were applied.
I am seeing it take over an hour now to taper from 0.9 amps to 0.4 at 14.7v. Whenever I check it during the day I am expecting to see X amps, and as it ages I am seeing X amps + more than expected.
But after a High amp recharge from well below 50% to full, these times again are reduced. not to when it was new, but much less than 7 low and slow solar only cycles or 7 cycles without 40+ amps when depleted to 50% or more.
As mt AH counter is at my right elbow as I type this, I also get a very good idea how the battery is performing during discharge, and I judge this by voltage held under X amount of amps and at X AH from full.
Right now I am at 12.57v under a 6.4 amp load and 19Ah from full, and might just plug the meanwell into the power strip. I disconnected it during the day to utilize the solar instead and did not drive anywhere so i did not physically unplug.
My compressor fridge cycled on so it is delivering only 32 amps into the battery, but within a minute it is up at 14.8v. The battery is 61f. 18AH from full would be 80%, if the battery still can deliver 90AH, which I doubt, at ~750 deep cycles.
I last reset the monitor last week as it was saying 0 from full when it was accepting 1.8 amps at 14.7v, where full is 0.45 amps or less at 14.7v.
I do recall using amperage at EQ voltages as a determinant when to stop EQing, after many EQ cycles where I did dip the hydro and look at the Amps the battery was accepting.
But I do not recall doing the same thing at absorption voltage. Mostly the Screwy31 was a downward trend in SG each and every cycle, and higher absorption voltages held longer just slowed the SG walk down, and reduced the time required at EQ voltages for it to max out again.
I find amperage at absorption voltage, while perhaps not quite as precise, but with no other option with AGM, other than blindly trusting the untrustable amp hour counter, to be quite enlightening, and the time to 0.5% of capacity, from when absorption was reached, to the time it tapered to that threshold, to make things quite obvious as to what was going on as the cycles accumulated, and how they varied when larger charging sources were applied and after they were applied.
I am seeing it take over an hour now to taper from 0.9 amps to 0.4 at 14.7v. Whenever I check it during the day I am expecting to see X amps, and as it ages I am seeing X amps + more than expected.
But after a High amp recharge from well below 50% to full, these times again are reduced. not to when it was new, but much less than 7 low and slow solar only cycles or 7 cycles without 40+ amps when depleted to 50% or more.
As mt AH counter is at my right elbow as I type this, I also get a very good idea how the battery is performing during discharge, and I judge this by voltage held under X amount of amps and at X AH from full.
Right now I am at 12.57v under a 6.4 amp load and 19Ah from full, and might just plug the meanwell into the power strip. I disconnected it during the day to utilize the solar instead and did not drive anywhere so i did not physically unplug.
My compressor fridge cycled on so it is delivering only 32 amps into the battery, but within a minute it is up at 14.8v. The battery is 61f. 18AH from full would be 80%, if the battery still can deliver 90AH, which I doubt, at ~750 deep cycles.
I last reset the monitor last week as it was saying 0 from full when it was accepting 1.8 amps at 14.7v, where full is 0.45 amps or less at 14.7v.
