Clarity around CAC imbalances, voltage imbalances, bad bricks, and battery warranty - 2015 90D

[hybridbear]

I've also had a rapid loss in range for the last months, however I just got the scanmytesla cable and app last week and I don't have much for imbalances.
Can some explain the Nominal Full Pack number... Mine reads 62.7 kWh, for my 2015 P90D what should it be?

Our 2016 90D reports about 75 kWh as nominal full pack. A few years ago it was just under 80 kWh.

 

[Zelectric]

Here are the non driving numbers.

 

[brainhouston]

Here are the non driving numbers.

none of these show imbalance values... did u mean to attach more pics?
but 61.6 nominal is pretty bad degradation
my 90D pack has 76 with 90k miles

 

[Zelectric]

none of these show imbalance values... did u mean to attach more pics?
but 61.6 nominal is pretty bad degradation
my 90D pack has 76 with 90k miles

Tesla says it's only 16% degraded

 

[brainhouston]

Tesla says it's only 16% degraded

Hmm.. ur full rated on the other post shows 207mi
Depending on what rating u use, i get either 23% or 18% degradation (270mi or 253..)
Check out this thread:

P85D / P90D range compared to 85D/90D

Original specification show P85D/P90D has less range than their non Performance (85D/90D) couterpart. Did Tesla later send an update to Performance cars to improve the range (miles per change) similar to that of 85D/90D? Ex. P85D increased to 265miles? Not sure why Tesla.com used inventory show...

teslamotorsclub.com

8mV imbalance is really good.

 

[Zelectric]

This mornings 80% charge numbers.

 

[Zelectric]

So my 80% charge for the last 5 years (depending on the time of year and temp) 199-205, starting about actually dealing with this for about a year now. My 80% charge numbers range from 156-161. Plus when I bought the car it was already 1.5 year old, so I figured the normal degradation had already happen. So just take those numbers into play, its around 78% not taking into factor the first owners normal first year degradation.

I'd just like to know the nominal rating of the battery new so I can show them what it is now?

Are there any test/reading that I need to do? Full charge reading?

Also how do you all get the graphs that are attached to your other pictures to show historical data?

 

[hybridbear]

Also how do you all get the graphs that are attached to your other pictures to show historical data?

@ajadan & @EvDart used charts from TeslaFi. Have you used TeslaFi? It won't be able to show you past data that it didn't log, but you could start logging now. If you want a referral code for a longer free trial I'll send you ours via PM.

 

[Zelectric]

I think I signed up for teslafi years ago @hybridbear let me look.

 

[BrownOuttaSpec]

I think I signed up for teslafi years ago @hybridbear let me look.

62.6 kWh Nominal full pack is REALLY bad and probably going to fail soon. I would suggest "helping it" if you are still under warranty. For reference my 90 pack is 76.9 kWh with 83k miles.

@seenhear @hybridbear You need to go into the Google store settings and sign up for the "Join Beta" for this app to get the new visuals and CAC values.

Here is a Android screenshot of the beta version on my 3/2016 MS 90D.

@ajadan Let us know the specs of the new pack once you get it replaced under warranty

 

[hybridbear]

62.6 kWh Nominal full pack is REALLY bad and probably going to fail soon. I would suggest "helping it" if you are still under warranty. For reference my 90 pack is 76.9 kWh with 83k miles.

@seenhear @hybridbear You need to go into the Google store settings and sign up for the "Join Beta" for this app to get the new visuals and CAC values.

Here is a Android screenshot of the beta version on my 3/2016 MS 90D.

How do you "help it" along to failure?

The SMT Beta has lots of issues. I had tried it before. Is it still unable to customize tabs like in the normal version? Until the customizing is there I won't change over. I only really use my customized tab with the values I want to see.

Also, I don't see CAC in your screenshot...

 

[BrownOuttaSpec]

How do you "help it" along to failure?

See post #4 and #12. Stress and heat, pretty much doing the opposite of what's good for a battery.

Also, I don't see CAC in your screenshot...

It was in the app but cutoff on that screenshot. I tried to get it again just now but that field wouldn't populate. Like you said the beta app is a little buggy

 

[seenhear]

@seenhear @hybridbear You need to go into the Google store settings and sign up for the "Join Beta" for this app to get the new visuals and CAC values.

Thanks, I'll try it out. My car is still in the SC getting a new DU and brakes fixed.

 

[BrownOuttaSpec]

Also, I don't see CAC in your screenshot...

Update: I went for a drive and the CAC values populated in the Android beta app.

 

[brainhouston]

Update: I went for a drive and the CAC values populated in the Android beta app.

View attachment 952352 View attachment 952353

Same experience here.

 

[jensk2]

Same experience here.

Yes, a drive plus leaving Phone connected for 20 minutes in car revealed a +/- 0,8% CAC imbalance on Model S 70D October [email protected]:

And total capacity of approx 221Ah * 3,6V * 6 Bricks * 14 Modules = 66,83kWh total to compare with 71,2kWh new
My usage pattern is charge as little and often as convenient and center around 40% SoC and all long resting should be < 55% SoC.(55% when NCA, 60% when NMC) .

As stated elsewhere the SMT BrickId is partly an integer and partly a Float and often way out of Range, say 111 on my 84 Brick battery I will report to SMT Beta.

 

[Zelectric]

I opened another ticket with Tesla 2 weeks ago, this time the said it was due to the CAC imbalance, my Android version still won't ever give me the CAC numbers so I borrowed an old iPhone from work and got the following numbers. Tesla remote tech suggested charging to 90 for a few charge cycles and to 100% a few cycles while allowing it to discharge to 60% or less each time. Then closed the ticket a week later before giving me what he thought the results were after those test.
20.4AH of lost is only about 10% loss, and my Nomial full pack has also last another 1kWh since my July post above.

 

[kirkusss]

At 20Ah CAC imbalance your pack is hanging by a thread

 

[NV Ray]

At 20Ah CAC imbalance your pack is hanging by a thread

@Zelectric if still under warranty, my understanding is that a CAC inbalance of >20% is grounds for in warranty pack replacement. Looks like you're halfway at 10%

That said, there is some indication that ScanMyTesla does not provide an accurate reading of CAC imbalance. This discussion over on Facebook will help.

From the link "one note on SMT. it does display min/max CAC in the latest version and is great improvement. however, we’ve seen some variability in the numbers it reports - in fact, we saw a 4 Ah discrepancy just this morning. and the brick IDs are all over the place for some reason. sadly totally unreliable currently

we’d suggest getting CAC from second source before running for the hills. we always use raw CAN data directly from the BMS to avoid any issues"

 

[Koike]

I actually have a dumb question. I have SMT and I'm not seeing the CAC imbalance on my app. Am I missing something?