Tata Nexon EV: Analysing charging rate curves & patterns

Notice the change in slope of the graph which means the first 25 odd %SoC it is charging faster than normal

BHPian electric_eel recently shared this with other enthusiasts:

I am attaching the charging graphs of the last charging (done on a 7.2 KW home charger). The first image shows the overall charging graph. Notice the change in slope of the graph which means the first 25 odd %SoC it is charging faster than normal

Here is the zoomed version of the charging graph in the normal charging region. Each dot in the graph can be seen as a 1 min worth of charging and as expected there is roughly 3 or 4 dots between each percent SoC increase (as expected). A 7.2 KW charger should be able to add 0.3 percent SoC per minute for a 40 KWH battery.



On the other hand in the abnormal charging region every soc increase is happening in less 1 min roughly. This means the energy content in 1% SoC in the abnormal region is about 1/3 of what is available in the normal region.

In practice the sudden SoC drop starts at 15 %SoC although the charging graph indicate some where around 25-26% SoC has a energy content issue. I will soon be taking the EV for its schedule service As of now the SoC curve is predictable.

Read BHPian comments for more insights and information.