Woo Hoo..New AGM Batteries
two of the new ones in their workplace, the battery rack last night 7:30pm meter 12.93v lights and fans running this morning 6:30 am (early for us) 12.62v down 65ampHrs from full i set th...
Forum Discussion
LY, I am used to the idea that the battery has a natural max acceptance rate for the SOC at a particular voltage, so that's all it will take in out of what the charger could provide. As SOC (battery voltage) rises, at constant charger voltage, acceptance rate goes down = tapering.
When you say the amps are maintaining the voltage, I see that as backwards for cause and effect.
I think the voltage difference is maintaining the amps. As the voltage difference between the charger and the battery shrinks as SOC rises, the amps taper.
If you jack up charger voltage, the difference widens and you get more amps at the same SOC.
But you still get the right answer even if you are looking at it all funny :)
On fast/slow charging-- my ugly graph does show this clearly. With a higher charging rate (initial amps/battery size in AH) you get a shorter bulk time but a longer absorption time--with overall shorter time to replace AHs.
So as your battery capacity shrinks with progressive capacity loss, your charging rate goes up--using the same charger-- and so that is what Mr Wizard is seeing because he is not doing very deep cycles and is mostly in Absorption for his recharge--which takes longer and longer for that part he is doing (absorption) He is missing the earlier faster time part by not going down so far in SOC.
If he were doing 50-90s every time , each one would take less time as there are fewer AHs to restore each time.
That does not mean Mr Wizard should be doing 50-90s! With solar the idea is to get the batts as high in SOC as possible each day and that means operating in the higher SOC zone where a recharge is mostly in the absorption stage.
When you say the amps are maintaining the voltage, I see that as backwards for cause and effect.
I think the voltage difference is maintaining the amps. As the voltage difference between the charger and the battery shrinks as SOC rises, the amps taper.
If you jack up charger voltage, the difference widens and you get more amps at the same SOC.
But you still get the right answer even if you are looking at it all funny :)
On fast/slow charging-- my ugly graph does show this clearly. With a higher charging rate (initial amps/battery size in AH) you get a shorter bulk time but a longer absorption time--with overall shorter time to replace AHs.
So as your battery capacity shrinks with progressive capacity loss, your charging rate goes up--using the same charger-- and so that is what Mr Wizard is seeing because he is not doing very deep cycles and is mostly in Absorption for his recharge--which takes longer and longer for that part he is doing (absorption) He is missing the earlier faster time part by not going down so far in SOC.
If he were doing 50-90s every time , each one would take less time as there are fewer AHs to restore each time.
That does not mean Mr Wizard should be doing 50-90s! With solar the idea is to get the batts as high in SOC as possible each day and that means operating in the higher SOC zone where a recharge is mostly in the absorption stage.
