arnis wrote:We can clearly state that at 120kW speed Tesla battery gets much more than 2.4kW of heat.
To be more exact Tesla is not able to charge at maximum speed in some scenarios because of thermal throttling.
That's a non-sequitur. Is thermal throttling only based on pack temperature, or could it be based on the temperature of other electrical components, like the big relay that Tesla uses to switch the power input pins between the charger and the battery?
To determine the heating inefficiency of charging, we'd need the following data on a charging session:
Starting pack temperature
Ending pack temperature
Pack thermal coefficient
Pack heat lost to cooling
Energy delivered in kWh
The computation would be a lot simpler if any forced pack cooling is temporarily disabled for this data gathering. Depending on how well the pack is thermally isolated, we might also need to know the passive cooling rate when the pack is above ambient temperature. If the temperature decay rate is low enough, and the charge session is short enough, we can ignore the passive cooling.
arnis wrote:Do we agree that Tesla can extract heat at minimum 6kW rate?
No, I don't know anything about how Tesla extracts heat from its packs, and you haven't presented any data on the topic.