Not another battery degradation thread…quite…

[raharris]

My understanding is that the more charge in the battery the better the obtainable performance; so this got me wondering…

I would assume that Porsche measured HP with batteries fully charged with 0% battery degradation - in my instance quoted as being 616 HP (Will ignore launch control for this topic).

As the battery degrades over time, is therefore our HP degrading?

Also, anyone have any insight into how battery charge level and HP correlate? If we typically stop charge at 85% - are we getting 85% of 616 HP?

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[raharris]

These guys did some Model 3 testing, very noticeable drop below 75% charge!

https://www.mountainpassperformance.com/tesla-performance-model-3-dyno-testing-at-various-soc/

 

[JimBob]

These guys did some Model 3 testing, very noticeable drop below 75% charge!

https://www.mountainpassperformance.com/tesla-performance-model-3-dyno-testing-at-various-soc/

This is testing a Tesla with its 400v system, not the 800v of the Taycan so the Taycan should do better. Or at least that's what the sales pitch says.

 

[raharris]

Found this thread on here about the correlation of SoC and performance.

https://www.taycanforum.com/forum/threads/performance-drop-with-low-soc.3471/

this would generally also align with the idea that as battery degrades, and 100% no longer being 100% we once had - that power my drop sooner than 50%

 

[feye]

My understanding is that the more charge in the battery the better the obtainable performance; so this got me wondering…

I would assume that Porsche measured HP with batteries fully charged with 0% battery degradation - in my instance quoted as being 616 HP (Will ignore launch control for this topic).

As the battery degrades over time, is therefore our HP degrading?

There was a YT guy testing LC of the Taycan as often as possible. 10 times no problem with repeated performance. Then the battery was low and the LC performance was reduced. That means even with some degradation, you still have plenty of LCs in the tank.

 

[epirali]

I can tell you that when I test drove RS Audi ETron (same basic drivetrain) that only had 25% battery sitting at dealer (which honestly was a good thing not to keep a car sitting at full charge that was not going to be driven, they were not allowing test drives) it was less punchy than when it was charged to 70 or 80%.

The repeated launch control shows that yes there is a lot of punch still left, but probably not as much as at higher charges. It more shows off the thermal management of the Taycan battery and the fact that unlike some previous Teslas the system is not being pushed beyond normal operations just to get the numbers, then needing a significant amount of time to cool down.

 

[smoothound]

Here is a link to test a Taycan Turbo S at 50% charge with a higher charged Taycan Turbo - The Turbo was faster.

 

[ericj320]

Also, anyone have any insight into how battery charge level and HP correlate? If we typically stop charge at 85% - are we getting 85% of 616 HP?

Short answer is no. But think logically, if at 85% SOC you had 85% HP, wouldn’t that mean at 10% SOC you’d have 10% HP?

One of the major benefits of todays battery technology is, not only is the power loss not linear in relation to SOC, they have a great ability to maintain voltage at a relatively high level deep into the discharge. There will be some loss of HP as voltage is decreased, how much is the question. For the most part I would be willing to guess it would be almost negligible unless you were pushing it to its limits or doing accurate testing. The graph below isn’t for the Taycan, but they are a fair representation of today’ batteries, and it will only get better as technology advances.

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