Your idea of waiting a few days with the present settings, so see how the bank responds sounds fine to me.
Will have a couple of questions about the data that you posted, but later for that. Yes, this is a long Thread, and there have been many, many suggestions of what you should try. This can be a bit overwhelming, but you have hung in there. Later, Thanks for your Spain location. Vic
I am available for custom hardware/firmware development
This is a fairly long discussion, and forget some of the fine detail, and all of the suggestions that have been offered/discussed.
The Return or Finishing current in Absorb will depend upon the Absorb voltage. Likewise for battery current in Float and EQ.
Do wish that Ako had an MPPT CC, which was more settable, and info from it would be more easily understood. The TS-60 CC has always been a bit too mysterious to me.
I forget just how you determine battery current, is this inferred from Duty Cycle? A battery monitor, ... or ...?
If the :"Rolls absorb algorithm" that jonr referred to, was the one for calculation Absorb time, then, agree, IMO, this is for constant current chargers (IUI, or similar), and is not well suited for Solar charged batteries.
FWIW, each of the two Surrette battery banks here (4KS25s), each bank has had one battery (two cells) that have an SG of 1.280 (temp compensated), while the rest of the cells average 1.260 - 1.266-ish. IMO, this is not an impossibility. There are variations in the way each cell happens to turn out. There are differences in how the cells are Formed. Sere some of our batteries stored at the manufacturer, as dry charged, etc?
Had also wondered, if, perhaps some manufacturers ship batteries a bit short-filled, with 1.280 SG electrolyte, or similar (for those with target SGs of 1.265), hoping that the lower electrolyte level might result in less spillage during shipping (for those shipped, wet), Then the dealer/customer tops-up with Distilled Water, resulting in nominal 1.265 SG electrolyte, when at the correct fill level.
Couple of other things;In a single string battery bank, each cell will have a voltage across its terminals that represents the SOC of the battery. Cells that are more fully charged, will have a bit higher voltage than the lagging cells. When we add water duing Absorb for example (my favorite time to do so), then the cells with the highest terminal voltage will be gassing more vigorously than the lagging cells. Gassing (as well as heating during charge) raises the apparent electrolyte level. SO, generally with healthy batteries, the cells that electrolyze the most water, and need the most make-up water tend to get the least, when they are filled to a certain level. Taller batteries probably tend to exaggerate this difference.
Just more opinions, FWIW, Vic
Vic , i dont think the Rolls formula for calculating asorb time is for constant current chargers as it recognises the input current tapers off and voltage rises and factors that into the equation , if it were for a constant current charge then the calculation would be simpler . I have found the end current voltage to be reasonably accurate using the TS60 algorithm and terminates around the figure Rolls suggest at around 2% of C20 . After that Float kicks in and current in gradually reduces from around 8 amps to 2 amps .
Fine on that, but the Surrette formula appears to treat the available charge (max) current as a constant -- 50% of the maximum current available, They mention,
" ... for example,