Originally Posted by rgleason
Has your thinking changed a little and what are your current
"not above" and "not below"?
Your "summary" is not my words, never heard of a knee wall, where did that come from?
Best to just ask a specific question, in context, one at a time.
This is mine
>I define my 0% SoC as 11.9V (2.975Vpc) in a low-amp discharge context.
Yes, at higher amps, going a point or two lower on the LVD is equivalent, help reduce early cutoffs due to sag.
Setpoints should be easily adjusted to account for changing circumstances.
Look at any OTS BMS LVD cutoff, and you will see they are way way lower.
So lots of leeway there, I just choose to be more conservative.
And there is no significant usable AH capacity left between those two zones.
> Also if MaineSail has previously identified
Again, quote his actual words, with enough relevant context.
Giving your "summary" with different numbers from different use cases is misrepresenting others' recommendations.
> What voltages are generally accepted as the Manufacturer's range for full capacity 100% SoC?
Check with each manufacturer directly, to me that is not relevant to actual usage patterns.
If a vendor says the batt holds 80AH, and I find that charging
to my 100%
3.45Vpc (holding Absorb tapering to .03C only when precise calibration required, not as in daily use where I "charge **to** and stop)
then discharging 80AH down from there
leaves voltage way above my 0%,
say 3.15Vpc after resting
then I'm happy.
Some arbitrarily higher / lower voltages that IMO may be pushing destructively into the shoulders, and any few AH capacity gained that way is just theoretical, have no utility IRL and thus are not of interest to me.
Or rather the areas above and below that vendor-defined 80AH are only of interest as no-go zones, to be avoided in daily use.
But say I found a batch of cells that required "a BMS" to do active cell-level balancing, and that functionality only kicked in at 3.5Vpc or greater.
I may then have periodic maintenance
as one does equalizing FLA
where I increase my top-end setpoint to 3.55Vpc, and hold Absorb until each pack is re-balanced to spec
This higher-than-100% SoC has nothing to do with capacity IMO, and in fact is not in the least significant wrt usable AH, just surface charge and dissipated heat.
In doing a capacity load test down from my calibrated 100% above
if discharging to 2.975Vpc only used 75AH rather than 80, I would use that to re-calibrate my BM setting for bank capacity, and log the lost
capacity with an eye to learning
from that in order to try to avoid the same in other bank purchases or sub-optimal usage patterns, perhaps adjusting to a shallower DoD if possible in that install's context.