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D owners: When does current limiting occur?

Yes on the PD line shows up with low battery and is a big pain in the wazoo in cold weather. Goes away fairly soon for power limiting but can take 35 miles or more to give you full regenerative braking. I have had to move the charge limit up and add a hour of charge to warm battery to get proper operation. The car seems to think below 40 degrees is cold, not true, below zero is starting to get cold.
 

apacheguy

S Sig #255
Oct 21, 2012
5,167
1,356
So Cal
Interesting. The limiter I was seeing could have been caused by temp. As wraithnot pointed out this could occur as warm as 50 degrees. IIRC, it was mid 50s when I saw this so it could be. Never thought before that mid 50s were enough to cause any restrictions.

I would still be interested in seeing max power output (as logged via REST) against SOC for all models. It's clear that performance degrades with SOC, but I wonder if Tesla changed something with PDs to maintain the output at lower SOCs.
 

mspohr

Well-Known Member
Jul 27, 2014
12,091
16,174
California
Interesting. The limiter I was seeing could have been caused by temp. As wraithnot pointed out this could occur as warm as 50 degrees. IIRC, it was mid 50s when I saw this so it could be. Never thought before that mid 50s were enough to cause any restrictions.

I would still be interested in seeing max power output (as logged via REST) against SOC for all models. It's clear that performance degrades with SOC, but I wonder if Tesla changed something with PDs to maintain the output at lower SOCs.
Seems to be temperature related. My drive up My Rose where I saw the limit was at a temperature of 50F.
 
One more data point: my P85D was down to about 14% today but I never saw the yellow line even when doing Insane Launches. (Temp about 70F)

This would seem to suggest something is very different with the new E and F packs. While we can't all seem to agree on the exact SOC trigger for current limiting, it is clear that us with classic MS definitely get it below 20%.
 
I went back through some videos I shot when I first got the car, because I knew that I did some of them at relatively low power levels. I have a test drive where I was at 50 miles rated range left and did not experience the top end power limitation despite doing 5 or 6 insane launches in a row. At that time, I didn't have the ability to capture telemetry data but it was my subjective impression that the launches were slower than the ones I experienced with a fuller battery pack, but there was no visible power limitation. I know that I have seen it at least once and that was on a trip home where I was concerned about making it, so I never attempted to accelerate hard enough to test it, but I remember seeing the line at that time. It was quite cold that day.

I'm just under 50% now (after not charging overnight) and not seeing it despite spirited driving.
 

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