How to set to profile to only charge to 85%

[svp6]

I will do an experiment - downslope at 100% and see consumption at the bottom of the road vs downslope at 85%. If I am correct, the usage will be significantly higher when starting 100%. Will let you guys know.

So here are the results of today - mind you, it is a short distance, so errors could be significant. I drove downhill trying to keep constant 30 mph speed. Just paying more attention than usual to the green regen bar, I noted that at 100% charge, there is a wimpy green bar when braking. At 88 % charge there is a much larger green bar. The two runs are in the same day, probably one hour apart. The time difference on the clock (3 minutes vs one minute) is because I sat in the car for couple minutes during the first run - trying to get my SIM card to work - to no avail.....

Conclusion: regen is reduced to very little (if any) at 100% charge - meaning there is little (if any) buffer above 100%.

Bottom of slope starting 100% : usage 8 kWh/100 miles

Bottom of slope starting 88%: consumption -12.2 kWh/100 miles

 

[svp6]

Once there are plenty of the 350w chargers I totally agree but there aren't that many at all at the moment. I don't do many long trips but I don't always know much in advance that one will be needed. As mentioned it is slightly irritating for me but I have other vehicles so really it is yet another 1st world problem!

I suspect it depends on where the chargers are in relation to the route. 15% battery charge at the bottom of the battery takes so little that it is not worth mentioning. I usually try to arrive at the charging location with <10% - then top it up to 60-80% and go. I find that is the most efficient balance.

There is a very good youtube by the Autobahn Specialist in which he makes some calculations how long it will take to drive 1000 km at various speeds, and incorporating how many charging stops you have to take.

 

[Kingske]

So no, you don't. That document needs to be updated. Many here and elsewhere have reported battery availability at close to 90 kWh. Porsche decided at one point in time to allow more of the battery available for use. If there ever was a top buffer, my guess is that was the time when it got cancelled / severely diminished.

https://www.taycanforum.com/forum/threads/usable-battery-capacity.1773/post-22901

 

[Vim Schrotnock]

So no, you don't. That document needs to be updated. Many here and elsewhere have reported battery availability at close to 90 kWh. Porsche decided at one point in time to allow more of the battery available for use. If there ever was a top buffer, my guess is that was the time when it got cancelled / severely diminished.

OK, so reading the manual I see that you should be setting the maximum charge using AC to 85% for normal 'around town' driving. You should only use 100% for longer trips. I also read that using fast DC charging extensively will decrease battery life and capacity. Interesting.

 

[Gogs]

50KW DC charging will not hurt the battery. Anything above will as it’s forcing power into the battery and the chemistry of the battery is getting hammered. Saying all that, the battery management system is managing the flow so the degradation is going to be minimal. More importantly is not to charge to 100 and sit still for anything more than a few hours. Doing that will do more harm than charging at high KW chargers.

 

[svp6]

https://www.taycanforum.com/forum/threads/usable-battery-capacity.1773/post-22901

It is more than 87 kWh. Here are my calculations for 6 separate trips. Average comes to 91.48. Considering miles on the odometer may be slightly different than GPS miles, calculations could be a little off. Keep in mind that Google maps gives me 91.1 miles for one leg of the 182.4 mile trip on 6/1 - so not a lot of difference.

I did not drive the battery to 0 to see if behavior changes at the bottom third. From Bjorn Nyland's video, it looked like the battery usage remains constant at constant speed / temp.

Date	Speed (mph)	Distance (miles)	Wh/mile	Battery start (%)	Battery end (%)	Estimated battery size (kWh)	Estimated total range (miles)
5/30/2020​	73​	116​	332​	100​	60​	96.3​	290​
6/1/1931​	73​	182.4​	315​	98​	35​	91.2​	290​
6/4/2020​	73​	174.9​	299​	100​	43​	91.7​	307​
6/27/2020​	73​	184.6​	300​	100​	37​	87.9​	293​
7/31/2020​	73​	90.9​	307​	99​	68​	90.0​	293​
7/31/2020​	73​	90.5​	304​	68​	38​	91.7​	302​

 

[svp6]

OK, so reading the manual I see that you should be setting the maximum charge using AC to 85% for normal 'around town' driving. You should only use 100% for longer trips. I also read that using fast DC charging extensively will decrease battery life and capacity. Interesting.

As I get more comfortable with the car, I plan to use less and less the 100% option. With my wife's model 3 I have not charged to 100% in over a year - there are already 3 functioning superchargers in the Twin cities, another one under construction. As Electrify America expands the network (and hopefully the Porsche dealerships get their 800V systems) it will be the same for Porsche.

On the last trip to Chicago I did not charge to 100% at start - it was a last minute decision to go. I did not miss it - had to take two more sips of coffee at the Mauston supercharger

For the fast charging, that is correct. Luckily, if you do not depend on fast charging for your daily charge, the degradation you incur on the occasional trip is minimal. For my first Tesla (P85D), the degradation over 3 years was less than 2% - but I only drove ~25000 miles. I know other models (the 90 kWh battery) had larger degradation. Some owners complained that Tesla throttled the charging speed at superchargers to minimize battery degradation.

I am not aware on any report on battery degradation in the Taycan - car is still too young. Perhaps @louv has some info after his 11,000 mile trip.

 

[Vim Schrotnock]

50KW DC charging will not hurt the battery. Anything above will as it’s forcing power into the battery and the chemistry of the battery is getting hammered. Saying all that, the battery management system is managing the flow so the degradation is going to be minimal. More importantly is not to charge to 100 and sit still for anything more than a few hours. Doing that will do more harm than charging at high KW chargers.

I'm assuming that an occasional road trip with the 270kW DC charging will not damage the battery. Kind of silly for them to offer this option if it does.

 

[svp6]

I'm assuming that an occasional road trip with the 270kW DC charging will not damage the battery. Kind of silly for them to offer this option if it does.

If battery behaves like the Tesla, degradation will be undetectable for the occasional user. I think only heavy users will get in trouble with the effect.

 

[rcs1000]

I was under the impression Porsche reserves a portion of the battery to keep it safe and their 100% is not ACTUALLY 100% like it is with Tesla, therefore you can keep it to 100% by default and not worry about the misleading 85%. (ie Tesla requires you to set 85% as they are more reckless with resiliency and want to advertise a higher number, Porsche reserves some battery capacity so you can set it to 100%)

I would love to see a source for this.

 

[feye]

So no, you don't. That document needs to be updated. Many here and elsewhere have reported battery availability at close to 90 kWh. Porsche decided at one point in time to allow more of the battery available for use. If there ever was a top buffer, my guess is that was the time when it got cancelled / severely diminished.

But what is the actual gross capacity of the battery? How was the "close to 90 kWh" measured/calculated? Porsche must maintain a buffer in order to protect Porsche from warranty claims.

 

[Gubbjaevel]

I'm just referring to official Porsche numbers.

Many here and elsewhere have reported battery availability at close to 90 kWh.

I have completely missed this. Where and how?

 

[Scandinavian]

So here are the results of today - mind you, it is a short distance, so errors could be significant. I drove downhill trying to keep constant 30 mph speed. Just paying more attention than usual to the green regen bar, I noted that at 100% charge, there is a wimpy green bar when braking. At 88 % charge there is a much larger green bar. The two runs are in the same day, probably one hour apart. The time difference on the clock (3 minutes vs one minute) is because I sat in the car for couple minutes during the first run - trying to get my SIM card to work - to no avail.....

Conclusion: regen is reduced to very little (if any) at 100% charge - meaning there is little (if any) buffer above 100%.

Bottom of slope starting 100% : usage 8 kWh/100 miles

Bottom of slope starting 88%: consumption -12.2 kWh/100 miles

Some interesting observations in your posts. There is a huge difference in the regen between your two runs! It is not A very long run but yet.

I wonder if there would be even more regen when the battery is charged to a lower level. I know that for a Model3 it is still a bit limited at 88%. But at 75% it is much stronger?

 

[Scandinavian]

It is more than 87 kWh. Here are my calculations for 6 separate trips. Average comes to 91.48. Considering miles on the odometer may be slightly different than GPS miles, calculations could be a little off. Keep in mind that Google maps gives me 91.1 miles for one leg of the 182.4 mile trip on 6/1 - so not a lot of difference.

I did not drive the battery to 0 to see if behavior changes at the bottom third. From Bjorn Nyland's video, it looked like the battery usage remains constant at constant speed / temp.

Date	Speed (mph)	Distance (miles)	Wh/mile	Battery start (%)	Battery end (%)	Estimated battery size (kWh)	Estimated total range (miles)
5/30/2020​	73​	116​	332​	100​	60​	96.3​	290​
6/1/1931​	73​	182.4​	315​	98​	35​	91.2​	290​
6/4/2020​	73​	174.9​	299​	100​	43​	91.7​	307​
6/27/2020​	73​	184.6​	300​	100​	37​	87.9​	293​
7/31/2020​	73​	90.9​	307​	99​	68​	90.0​	293​
7/31/2020​	73​	90.5​	304​	68​	38​	91.7​	302​

In your post here how did you estimate the battery size? Is this details from how much the charger has delivered or from the car? Where can you find this?

Some of these posts should perhaps be moved to some sticky section as information? Is this possible.

 

[H20]

Morning All

First post for me.

I haven't seen the timer setting but not sure why I would want to stop at 85%?

I was advised that it would take 8 hours to fully charge but it is taking 12 hours and my theory is that the 8 hour time is based on the supply to the property being 100 amp hour cable. My cable is 80 amp hour and so it must restrict the supply.

Not really a problem but if I arrive home at 9:00 pm the car isn't fully charged for an early start the following day. Liveable with but a little frustrating.

Any comments?

Bob

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