Indeed. It would be great if this were a new feature. The 12.5C/55F temperature of my garage was not lower than usual and I have not noticed this battery-heating phenomenon before.
Wien You start charging with the PMCC, you could check to see how much power gets into the battery, which is displayed in the car. And then check the power supplied by the PMCC. I think you should see a difference between the two values.
Good idea. Will do next.
But the outside temperature was much lower wasn’t it? The battery management takes this into account and probably acts upon that data. Here is a cut from the Porsche Technical description .
You are correct. I checked a minute ago. The PMCC is at 5.72 kw, the car says 5.18 kw (I'm charging at 24A) The battery temp continues rise. It is now at 65F (20 degrees higher than the initial temp).
That difference is likely too small, and just shows the charging loss. About 10 % or so is quite normal. Since your battery now is nice and warm it probably heats up by waste heat rather than specific pre heating. . It would be very valuable if you checked this at the start of the charging session if it still is cold outside.
Possibly. The Porsche document you linked to refers to "outside temperature" which may also be the temperature outside of the car (i.e. the garage temperature). The real under-the-sky-outside temperature was indeed markedly lower than before. Thanks for alerting us to this. On a related note: I checked the car again a minute ago - after it had been standing untethered overnight in a chilly 11.5C/53F garage - and the battery temperature of 13C/55F had nearly equilibrated with the garage temperature (see picture below). However, the projected range at 85% SoC was still 246 miles. The guess-o-meter seems to take the exterior temperature into account but not the battery temperature itself.
I have done research in the past about charging the battery at low temperatures. The measurements were made by charging with 3-phase 240V, which corresponds to approximately 6kW. These measurements showed that 100% of the current was used to heat the battery until the temperature had reached approx. 13C / 55.4F. Thereafter, 100% of the power was used exclusively for charging. The energy consumption to heat the battery approx. 13C / 55.4F was approx. 4kWt. (See the thread "Taycan 4S + Coldweather experience")
A lot of people have weighed in on the temperature question but I thought I'd respond to the notification part. I've seen this behavior myself a few times lately. My assumption is that the recent Feb 11 app update (v. 4.4) changed some default notification behavior. Like you, I've received notifications from Connect when charging has completed when I hadn't otherwise opened or used the app. At some point I'll poke around to see if I can turn it off, but it seems harmless enough.
Awesome data, thanks - sorry MadsK, should have remembered it was you who originally posted the info.I have done research in the past about charging the battery at low temperatures. The measurements were made by charging with 3-phase 240V, which corresponds to approximately 6kW. These measurements showed that 100% of the current was used to heat the battery until the temperature had reached approx. 13C / 55.4F. Thereafter, 100% of the power was used exclusively for charging. The energy consumption to heat the battery approx. 13C / 55.4F was approx. 4kWt. (See the thread "Taycan 4S + Coldweather experience")
At the request of "Scandinavian" I have done the same test with a lower current, 1-phase 240V, which corresponds to approx. 2kW.
These measurements showed that 100% of the current was used to heat the battery until the temperature had reached approx. 12C / 53.6F. After this, approx. 0.5 kW to maintain the battery temperature of 12C / 53.6F while the rest was used for charging. I have attached the form from previous thread and have added Test 3 with the lower current.
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It seems to be following a very similar SoC-temperature trajectory.Here is the latest. Battery temp continues to increase (now 72F) at 79% SOC charging 5.24kw. Maybe by the time it finishes charging to 85% it will be at the ideal temperature for charging
If I remember correctly that statement of pressing the button after completed timer charge etc refers to the Good to Know app for 2021 model?? Might be possible that for 2021 models Porsche tried to address the 12 volt issue and introduced some new problems instead?? Hopefully not included in that promised SW update, whenever or if that ever arrives?
