Available KWh

[iomagico]

Which is the best way to know the REAL available capacity of the I-pace energy storage?
I have two softwares

Wattcat says more than 87 KWh
Power Cruise Control says 77Kwh

Both on may car, fully charged by slow charging

[dernotte]

Drive the car to empty the battery, as much as you safely can, then, depending on your L2, use your L2 charger if you can pull out metrics from it (kw, etc...), otherwise go to a L3 charger. In both case, fill the battery up to 100% (could cost some money on L3 charger) and note the kw that has been pushed to the car. Keep in mind that there is some energy loss with L2 charger due to the AC/DC converter. A bit less loss on L3.

[iomagico]

No way to extract from the car by ODB?

[ELray]

According to the chief engineer, Stephen Boulter, it’s NET capacity is 84,7KWh.
Here is a video he says that:

[ELray]

No way to extract from the car by ODB?

Power Cruise Control Is the app that pulls data from ODBII

[iomagico]

No way to extract from the car by ODB?

Power Cruise Control Is the app that pulls data from ODBII

Yes I know that available capacity “should be” 84.7 Kwh and PCC is connected to the car by OBDII but Jaguar doesn’t show the available capacity.
Power Cruise Control use the SOH parameter (which is wrong, in my opinion) to calculate the available capacity and, on my car, 1500 km, brand new, it shows 77 Kwh available and SOH=91.5%.
I am deeply testing now this topic, charging the car to the top by a slow charging and then driving till zero kwh. Will then recharge to estimate the absorbed energy (taking in count the heat loss).
Will publish here the results on a sheet, with Wattcat and PCC results.

[Jaganon]

My car is showing 56kWh at present through the data I’ve been collecting. This is shown by discharging the battery and taking the kWh added through the 7kW home charger. I found this to be high compared with the estimated energy from the WattCat and MyPace apps. After research it seems a 10% loss of energy through a 7kW a/c charge is average. (DC rapid charging has a lower energy loss). When I deduct this 10% from the kWh added shown on the charger app, the level of kWh available is very close the the WattCat and MyPace estimated energy.

This seems to be the only way for us to know the storage capacity of the batteries and provide ‘proof’ to Jaguar.

Just started another spell in the workshop, and hopefully the I-Pace technician and Jaguar get the problem now.

[dernotte]

Will publish here the results on a sheet, with Wattcat and PCC results.

If you want to share a full charging session data here, you can use my web page here : http://ipace.herokuapp.com/static/charge.html
Just cut and paste the graph when the charge is completed. You can also export all data to a CSV format.

[Grunt]

Will publish here the results on a sheet, with Wattcat and PCC results.

If you want to share a full charging session data here, you can use my web page here : http://ipace.herokuapp.com/static/charge.html
Just cut and paste the graph when the charge is completed. You can also export all data to a CSV format.

Thanks dernotte! Very cool.

I'm not sure to understand the different graphs...
Battery is net total capacity in kWh?
What is kW vs kW Comp?
Deg is battery temperature?

[dernotte]

I'm not sure to understand the different graphs...
Battery is net total capacity in kWh?
What is kW vs kW Comp?
Deg is battery temperature?

Yes, Battery is net total capacity in kWh.
kW Comp is the computed value for charging rate. Because the API does not provide Volt and Amp, but rather a % (of battery) per hour, this value is actually the result of : 86.5 (theoretical value for a full battery) x (%/h) . At the beginning of the graph, during the first hour, or so, this value may have a high kw rate than the capacity of the charger, which does not make sense (you can see 10kw for a 7kw charger) , but once you pass that initialization phase, the value seems accurate
Kw value is the same value as the previous one, except that it is based on the delta value on the battery metric over time. ie the battery value goes from 45kw to 46kw in 10 min, this will be translated into 1kw per 10 min or 6kw per hour. I recently put this metric to compare it with the kw based on %/h, to see how reliable it is. It seems like they are quite similar.
Deg is updated every hour, and comes from a public weather API , and I am pulling the external temperature where the car is located. I wanted to see if the external temperature has an incident on the graph.

The Y1 or Y2 refers to the left or right Y axis.

I hope that help.

You can also play around with those two other pages. These 3 pages just display values from the Jaguar API, just like the official app.

http://ipace.herokuapp.com/static/jlr.html
http://ipace.herokuapp.com/static/param.html