Problem on first use of an OBDLink MX+

[Dr Bob]

Energy turnover is a good measure of total 'stored' power (it's a "mileage" counter for energy ingested). You can use this as the lower limit of consumption (and if you only charge at the marina, or are disciplined enough to make these readings before/after all charging sessions everywhere).

Thanks WasserGKuehlt, that's just what I was looking for. Your idea of 'Energy turnover' looks very good. I can easily take a photo of before and after charging to see what the KWh number is.

I can then see how that relates to 'battery energy'.

From the posts from Nick and Frank, I will also closely look at my charging on public chargers in the next month to compare actual kWh added (ie from Ionity etc) vs the delta SoC before and after charging to see if that is a better way - and then, as you said, agree with the marina owner the best way to pay.

Now, all I need to do is work out from car scanner how to get graphs of vatious tags and expot the data. All inputs very welcome.

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[ciaranob]

Frank,
you say look at the display of power into the battery - is that just the increase in SoC times the 93.4kWh - or are you using the dongle to report power?
I am thinking that the SoH is 90% ish, and the true capacity is lower than 93.4kWh, then the actual power put in is quite a bit less - but then that is offset by Nick's losses in the wires etc.

The loss you are reporting with a 13a plug is quite significant!! The wire did heat up a lot when I charged this way on the Tesla (not very often).

Might want to browse this thread although realize it is very long! I keep the following info in Post 1 and update the charts there as new data comes in:

https://www.taycanforum.com/forum/threads/baseline-for-hv-battery-soh-performance.12815/

PB+ capacity = 93.4 kWh
Porches's 'advertised' buffer states actual usable = 83.7 kWh
However, actual tested (multiple sources) accessible capacity = 86.7 kWh
Thus you SoH from CarScanner is a % of 86.7 kWh usable.

The latter number appears to be quite accurate and has fitted calculated degradation from quite a few cars to date including my own. Also the SoC HR is the correct SoC to use in CarScanner.

Cheers, C.

PS: and as others have said the warning on plugging in the OBDII tool is nothing to worry about.
PPS: and that Battery Energy field in CarScanner is a pretty accurate read of you current available capacity i.e. Soh applied to 86.7 kWh.

 

[WasserGKuehlt]

Now, all I need to do is work out from car scanner how to get graphs of vatious tags and expot the data. All inputs very welcome.

The app allows exporting of 'diagnostic codes', I'm sure there must be a way to do the same for sensor data. I would recommend contacting the developer (via the app) and ask - perhaps it's a paid option. (Mine's the cheapo, free version, as I only use it infrequently.)

After having spent a minute playing with the app in demo mode, it sounds like you can compose your own custom graphs showing just the sensors you want, and that backups should be possible. Good luck.

 

[kurand]

Not sure that looking at power on public DC chargers will give you anything useful for AC charging. When using AC, there is a lot more going on in the car and thin AC cables will likely have much larger losses than fat DC public charger cables. If you can’t measure the power delivered from the EVSE, I’d suggest that you just agree on a % figure for these losses, say 12%

 

[ciaranob]

Not sure that looking at power on public DC chargers will give you anything useful for AC charging. When using AC, there is a lot more going on in the car and thin AC cables will likely have much larger losses than fat DC public charger cables. If you can’t measure the power delivered from the EVSE, I’d suggest that you just agree on a % figure for these losses, say 12%

I actually calculated this based off the entire data history of my car (incl total AC charge put in etc) and came up with close to 20% losses which seems really high but the data appear to suggest so - but of course lot of variables involved!

See example here (2nd para below chart):
#382

 

[kurand]

Yup, AC charging losses do seem somewhat high. I have an EmonPi monitoring my EVSE (Simpson&Partners 7+) charge cable (3m long) and use the cable that came with the car to connect the EVSE to the charge port, and regularly see 17% losses. Actual losses will depend on individual EVSEs, installation, cables and the onboard converters.

 

[Johann55]

The app allows exporting of 'diagnostic codes', I'm sure there must be a way to do the same for sensor data. I would recommend contacting the developer (via the app) and ask - perhaps it's a paid option. (Mine's the cheapo, free version, as I only use it infrequently.)
After having spent a minute playing with the app in demo mode, it sounds like you can compose your own custom graphs showing just the sensors you want, and that backups should be possible. Good luck.

I already tested it. Sensors displayed on screen are always stored in Data Recording (can be exported as .csv). But app only records sensors from screen I am viewing at any moment. If I swipe to another screen, it will turn to recording sensors from the new page (displayed on screen).

But there's a shortcut to record any page even in background: Dashboard page > Settings cogweel > Customise, enable 'Update in background'.

 

[Dr Bob]

PS: and as others have said the warning on plugging in the OBDII tool is nothing to worry about.
PPS: and that Battery Energy field in CarScanner is a pretty accurate read of you current available capacity i.e. Soh applied to 86.7 kWh.

Thanks C for the link. I had seen that one but then lost it and forgot to look again -too many posts on ODBII dongles. I will post my Taycan data this weeked although my car was bought used (18 months old and 8,000 miles) so I have no data on its previoius life.

Thanks to all the others posting on power loss etc. All great information.

I already tested it. Sensors displayed on screen are always stored in Data Recording (can be exported as .csv). But app only records sensors from screen I am viewing at any moment. If I swipe to another screen, it will turn to recording sensors from the new page (displayed on screen).

But there's a shortcut to record any page even in background: Dashboard page > Settings cogweel > Customise, enable 'Update in background'.

Johann55, that's the sort of info I was looking for. I will spend an hour or two this weekend trying to work my way round the data recording and that will be invaluable. I may be back with more questions but please feel free to throw in any more tips.

 

[Dr Bob]

Ok, getting into working out how to use car scanner.

Thanks to the inputs above and particularly johann55 on recording all sensors, I can now see how to display the graphs etc.
Therefore in Data Recording when offline after disconnecting the dongle, I can click on a saved file and it gives me the long list of sensors. If I select a number and click 'ok', it then gives me the option of one chart, separte charts and Map+chart - which I can then view.

The question is though, how do I export the data? I cant see any options to export. I have upgraded to car scanner pro. Is there something in 'settings' that I am missing?

 

[Johann55]

Export - in Data Recording press and hold the saved file (probably swipe left/right on iPhone)

.csv - two versions, not sure how they work
.brc - probably a file for opening in Car Scanner on another phone

[edit: added Data Recording for clarity]

 

[Dr Bob]

Export - just press and hold the trip data (probably swipe left/right on iPhone)

Where is the 'trip data' ? I cant see that in data recording mode and dashboard and live data are not available when not connected to the dongle.

Please remember I am a muppet.

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