Net Amp-hour Reset

[Resthome]

Okay, I have to admit that I did not get to observe enough of the SOC functionality in my last trip to the boat when I updated the Classic firmware to 1779 dated 2/20/2014. So a few questions for the Midnite gurus.

My questions are around when can the Net Amp from the WB Jr get reset. In the latest WB Jr manual it indicates it can be reset every time the Classic goes to float. So what happens in skip days when the Classic comes out of Resting and goes to float? Or does it have to go from absorb to float to be reset?

Somewhere else and it could have been the Local App V 0.3.51 there was a check mark to reset Net Amp-hours on 100% SOC  IIRC.
So are there two setting or only one and when does the reset occur?

I am trying to figure out how to get the Classic SOC to closely track my Link 10 battery monitoring meter. But maybe this isn't possible since SOC is so subjective. But I would think I could get the Net Amp-hours to be similar if they reset at the same time. They are both using the same external shunt. Right now they are totally out of sync with each other. Any clues are appreciated.

[ClassicCrazy]

As far as I know  the SOC  will reset by itself when it gets to 100 percent - then it won't add any more amps It will count back down when amps go negative again.
I find the Classic Whizbang SOC is pretty darn close to the Trimetric SOC - or it was until a firmware update  added in the cold weather battery capacity de-rating . The Trimetric doesn't have that feature.  I have the same battery amp hour capacity and use 94% efficiency on both the Trimetric and the Whizbang settings.

My Trimetric and Whizbang also share the same shunt.

[boB]

In the tweaks menu, that last tweaks menu before the arc fault tweaks menu, you can tell the NET A-Hours
to reset when it goes TO Float by turning on WBRST.  Otherwise, the NET A-Hours will not reset at all unless
you reset it in the LOGS menu by pressing ENTER and selecting to reset it manually.

BTW, the NET amp-hours charing UPwards, does NOT take into account the efficiency reduction, nor does
it stop counting up when the SOC hits 100%.

Also, you probably already know this but you can disable the battery temperature capacity adjustment by
selecting 0.0% A-Hours per degree C in the WB Jr. 2nd setup screen.

boB

[Resthome]

In the tweaks menu, that last tweaks menu before the arc fault tweaks menu, you can tell the NET A-Hours
to reset when it goes TO Float by turning on WBRST.  Otherwise, the NET A-Hours will not reset at all unless
you reset it in the LOGS menu by pressing ENTER and selecting to reset it manually.

BTW, the NET amp-hours charing UPwards, does NOT take into account the efficiency reduction, nor does
it stop counting up when the SOC hits 100%.

Also, you probably already know this but you can disable the battery temperature capacity adjustment by
selecting 0.0% A-Hours per degree C in the WB Jr. 2nd setup screen.

boB

Thanks boB,

Can not check it now but I think the Local App setting is labeled to reset net amp-hours when SOC reaches 100% or something close to that. Maybe someone else can verify that.

If you have it set to reset net amp-hrs when going to float what does it do in the case of the skip days that goes to float after resting? Does it reset?

Now that we have established that Net Amp-hrs can accumulate positive amp-hours while in float after it has been reset to zero. It would appear that it would have to count down these positive accumulated amp-hrs once the batteries are being discharged. While I understand for wet cells that you need to put more in that you took out. I think in this case net amp-hrs would not be showing the true amp-hours taken from the batteries during the evening. So unless I have this all wrong I don't thing the Classic net amp-hours are going to match the net amp-hours of my Link10.

[boB]

The NET Amp-Hours will have nothing to do with the SOC or remaining amp-hours aspect of the display.
It is a completely different amp-hour counter.

If you have skip-bulk-days set up, I'm pretty sure (will check for sure) that the NET A-H will not
reset until it goes from Absorb to Float, whenever that happens.

If the net amp-hours reset at 100% SOC, then it would be the same thing as amp-hours-remaining except
starting from 0.  It would be amp-hours pulled out of the battery.  Maybe there should be a number for
that.

NET amp-hours was originally intended to be a life-time in vs. out amp hours kind of like the lifetime  -AH and +AH.

boB

[Resthome]

If the net amp-hours reset at 100% SOC, then it would be the same thing as amp-hours-remaining except
starting from 0.  It would be amp-hours pulled out of the battery.  Maybe there should be a number for
that.

NET amp-hours was originally intended to be a life-time in vs. out amp hours kind of like the lifetime  -AH and +AH.

boB

Thanks again for you reply boB. It's helping clear up a few things. I do understand the need for lifetime values being saved. I however would prefer to see how many amp-hours I am taking out of my batteries each day and when or if I have returned them. While the lifetime values are great for overall history of the battery bank it's different than the actual day to day performance that I look for. I think I am going to start a separate thread just on Classic SOC.

[zoneblue]

I can confirm that net ah doesnt reset at full charge when operating under days between bulk.

Ive pondered this some, but havent had a chance to start storing SOC datapoint yet.

Under days between bulk, (im currently running 5 days for the last 10 days or so), the charge acceptance curve tapers much slower, but the overall charge process occurs (more or less) nonetheless,  if you have enough daylight that is.

But a human can look at that taper and say, yes despite not having absorbed, the bank is full, by in my case about 2pm. Presumably SOC just hits the 100% ceiling and stops anyway.

I think theres things that can be learnt by the controller by tracking Ah in an Ah out over time. For instance some laptop energy mgmt packages you can actually watch the declining capacity of the bank.