Supercharging curve.. Is there an issue with my Battery/BMS?

[MP3Mike]

I don't know what data TeslaFi reports, but the miles per hour figure reported on the screen in a Tesla is an average for the session, not an instantaneous reading like the kW charge rate is. So that may impact what you are seeing in your graph. (Unless TeslaFi is calculating the miles per hour itself instead of using what Tesla provides.)

Will TeslaFi report the kW charge rate instead?

 

[SilverSp33d3r]

Did someone plug in on a paired charger?

 

[jbuszkie]

I don't know what data TeslaFi reports, but the miles per hour figure reported on the screen in a Tesla is an average for the session, not an instantaneous reading like the kW charge rate is. So that may impact what you are seeing in your graph. (Unless TeslaFi is calculating the miles per hour itself instead of using what Tesla provides.)

Will TeslaFi report the kW charge rate instead?

i don't know how it's reporting the info. If I look at my data for the charge above it said I added 219 miles. I was there for 58 minutes (lets call it an hour) My last reported mi/h was 81mi/h. So either either the number on the screen isn't the average for the session or teslafi is calculating the mi/h based on kWh added. Otherwise my last mi/h should have been in the 200 range.

 

[Rocky_H]

I don't know what data TeslaFi reports, but the miles per hour figure reported on the screen in a Tesla is an average for the session, not an instantaneous reading like the kW charge rate is.

That used to be the case for several years, but I thought I heard that in one of the updates this last year, that got changed to an instantaneous reading too. It wasn't much talked about.

 

[jbuszkie]

That used to be the case for several years, but I thought I heard that in one of the updates this last year, that got changed to an instantaneous reading too. It wasn't much talked about.

I'm kinda inclined to agree with this. It really seems to change too rapidly to be an average...

 

[RyanT]

I've had a tesla for 5 years now. It does seem to have change to be more instantaneous at some point, or at least it's more instantaneous on the model 3 than my old model s.

 

[jbuszkie]

@jbuszkie,
I added your data to the same chart. It looks like the other curves.

Back to this.. If I look at your legend.. What do the xxkWh mean? Is that the max charger rate? Were these super chargers? I'm not sure this is an apples to apples comparison if these aren't Tesla 115kW SC stations.

I've yet to see any else's charging sessions that match mine. Everyone seems to have a flat section where they maintain
a constant rate until somewhere around 50% then they start to taper...
All mine start to taper right after they reach max rate. Here are my latest SC sessions.

My best charge was when it was 33 deg outside. As you can see, none of my sessions have a flat, constant, charging rate.

 

[Troy]

Can you compare the blue line at 3:16 here, to your version? You would need to match the starting percentages because yours doesn't start at 0%.

 

[jbuszkie]

Adding in the data from the video... I get this

So mine definitely sucks compared to the video.

 

[Troy]

@jbuszkie, the chart in the video shows rated range instead of percentage (state of charge). That means the numbers need to be converted to a percentage. 310 miles would be 100%. Here is how the conversion looks like:

I'm reading the following numbers:

Minutes Percentage
10 20%
20 45%
30 63%
40 77%
50 86%
60 92%
70 96%
80 99%

In your version, the percentages look higher. For example, at the 30 minutes mark, the percentage was 63%. In your chart, the brown line shows 70%.

 

[jbuszkie]

@jbuszkie, the chart in the video shows rated range instead of percentage (state of charge). That means the numbers need to be converted to a percentage. 310 miles would be 100%. Here is how the conversion looks like:

I'm reading the following numbers:

Minutes Percentage
10 20%
20 45%
30 63%
40 77%
50 86%
60 92%
70 96%
80 99%

In your version, the percentages look higher. For example, at the 30 minutes mark, the percentage was 63%. In your chart, the brown line shows 70%.

I took my numbers straight from the video. I [painfully] went minute by minute and recorded the SOC and the charge rate.

 

[jbuszkie]

I also had to slide his graph in time so the starting point to mine was the same. Look at delta time. Not actual time. That's where the discrepancy is

Jim

 

[Troy]

At 30 minutes, your last chart shows 70% for the brown line but the video shows 63% exactly at this moment.

You are supposed to move each of your own lines to match the starting percentage and leave the brown line as it is. Move each of your own lines separately.

 

[gilscales]

Not all charges go the way you expect but that is not the norm, you should see over 100kw until over 55% soc

 

[jbuszkie]

At 30 minutes, your last chart shows 70% but the video shows 63% exactly at this moment.

You are supposed to move each of your own lines to match the starting percentage and the brown line as it is. Move each of your own lines separately.

It was easier to move one line! Anyway we just need to look at relative anyway.. The brown jumps up much faster and stays higher during the duration than any of mine.

 

[jbuszkie]

Not all charges go the way you expect but that is not the norm, you should see over 100kw until over 55% soc

Thanks for this. What was the (approx) temp outside when you did these charges? Your graphs are what I would expect my car should do. If the battery was cold-ish.. I would still expect a sustained charge till ~50% maybe not 115kW.. but something lower but flat..

 

[Troy]

I think the two dark blue lines look similar to the video. Both of them were over 20% when you started. I think it would be the same had you started close to 0% too.

 

[jbuszkie]

I think the two dark blue lines look similar to the video. Both of them were over 20% when you started. I think it would be the same had you started close to 0% too.

You can see that they are not. I started the brown (Kubo) line so it just about intersected the the blue traces. The brown line charges much faster.

 

[jbuszkie]

Here is the graph normalized to the brown..

So mine are way off..

 

[gilscales]

Thanks for this. What was the (approx) temp outside when you did these charges? Your graphs are what I would expect my car should do. If the battery was cold-ish.. I would still expect a sustained charge till ~50% maybe not 115kW.. but something lower but flat..

Not sure as I don't have that app anymore, it was summertime though so in the 60 to 80 degree range for sure