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...
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It just means the battery has a lower capacity after you don't do full recharges, leaving some sulfation, so now 100% next cycle is with fewer AH than before. It gets worse with each successive incomplete recharge.
That means with the same initial amps, you are starting off with a higher charging rate. That means you will get to Vabs sooner at a lower SOC.
Of course it also means with fewer AH making for 100%, it will not take as long to restore them to "full." Full is not as much as it was.
You have to do a "recovery" to get rid of the sulfation so then your battery can hold more AH and get back to near rated AH when indicating Full.
It is all about the charging rate. You can increase the charging rate by using more initial amps on the same size battery like in my ugly graph or get the same shifts in SOC by using the same amps on ever smaller battery banks.
This happens with AGMs same as it does with Wets.
You could compare charging a sulfated 110AH AGM with a clean 110AH Wet with the same initial amps and get the same recharge time because that 110AH AGM is not 110 amymore. Of course you would want to run a fair test, so you wouldn't do that :)
In the OP test (first guy) he may have had higher R wiring OR his batts may have been sulfated somewhat (or both things) but he said they were newish.
That means with the same initial amps, you are starting off with a higher charging rate. That means you will get to Vabs sooner at a lower SOC.
Of course it also means with fewer AH making for 100%, it will not take as long to restore them to "full." Full is not as much as it was.
You have to do a "recovery" to get rid of the sulfation so then your battery can hold more AH and get back to near rated AH when indicating Full.
It is all about the charging rate. You can increase the charging rate by using more initial amps on the same size battery like in my ugly graph or get the same shifts in SOC by using the same amps on ever smaller battery banks.
This happens with AGMs same as it does with Wets.
You could compare charging a sulfated 110AH AGM with a clean 110AH Wet with the same initial amps and get the same recharge time because that 110AH AGM is not 110 amymore. Of course you would want to run a fair test, so you wouldn't do that :)
In the OP test (first guy) he may have had higher R wiring OR his batts may have been sulfated somewhat (or both things) but he said they were newish.
