Odd BMS behavior

[Tooney]

BTW (and apologies for the thread drift), the potential 4CT purchase is here:
https://www.infinitiofbellevue.com/...oss-turismo-4-awd-4d-wagon-wp0ba2y19nsa67077/
... with one problem being that I am not there, and more specifically almost at the other end of the width of the North American continent.

Nothing beats a full cross-country road trip as a first drive. Ask @whitex.

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[Jonathan S.]

Nothing beats a full cross-country road trip as a first drive. Ask @whitex.

Given EA's decreasing reliability, I would probably give up partway and trade it in to the first dealer who offered me enough to cover return airfare!

 

[2P168S]

My car before the Taycan was an i3. When I bought the Taycan, I used my old BMW 10A EVSE for about three months before I got my L2 charger installed.

Other than it being very slow, it was fine.

Much ado about nothing IMO

 

[2P168S]

^ Interesting scenario for the overnight maintenance, thanks.

Curious though, for anyone who has plugged in at, say, more like 90% for that scenario, does the Taycan then reflect about 1%/hr SoC gain the next morning, or is it far less than that?

I got about 1% per hour with the Performance Battery (small battery). The car would show 0.8kW while charging.I have no doubt that L1 charging the Plus battery at 10A would result in less than 1% per hour.

BTW I have also charged on a 15A L1 EVSE at my parents house. While slow, it was overall much better because it took 2.5 days to fully charge the car instead of >4 days.

 

[daveo4EV]

^ Interesting scenario for the overnight maintenance, thanks.

Curious though, for anyone who has plugged in at, say, more like 90% for that scenario, does the Taycan then reflect about 1%/hr SoC gain the next morning, or is it far less than that?

my experience is about about 1% an hour…if things go well

in the overnight "scenario" also I would only use L1 if there is no alternative and I believe the car could be 'stressed' overnight - cold weather being the primary example - if presented with L2 opportunities I would never choose L1 over L2 - I will only use L1 if there is no choice and I feel the car could benefit from having power overnight (say morning pre-conditioning to warm it up)

I was in willows, ca last weekend for my daughter's new-driver clinic - temps were 78F-85F overnight (it was hot there) I was unconcerned for the battey overnight in those conditions - so the vehicle sat outside unpowered

 

[Jonathan S.]

^ All of that matches up with experiences (both rates and scenarios) with the i4, so reassuring the Taycan is roughly the same, thanks.

 

[2P168S]

As my own update to this thread, in case anyone cares-

I still see the same behavior now that I have a L2 EVSE. I don't think it has anything to do with L1 charging.

My latest case is I charged to 74% at ~8.5 kW (40A L2). The charging stopped. Three hours later the car showed 79% as I began driving it.

I've become convinced this is just the BMS doing an SoC calibration after the voltage has an opportunity to relax.

 

[WasserGKuehlt]

@Jonathan S. a couple of points - with apologies to the OP for re-hijacking.
- L1 charging: my view to this is "any port in a storm". I have used it this past winter to add some 'comfort margin' while renting a cabin in the wilderness. The rental had a 120V outlet outside (detached garage), and I noticed the car put on about ~10% in an evening +overnight. I had no concerns with overheating (at least the segments that were outside) since it was well below freezing. I would not hesitate to use L1 if I needed to, and had no alternative.
- the Bellevue car is local to me/us (several here), so I could take a look at it if you wanted. (We can continue this in private.) Based on a quick glance, the photo shows the 21" Design Aero blade wheels, but the description mentions 19" Aero. Not a good sign.

 

[Jonathan S.]

^ Thanks for the confirmation on L1 charging. Exactly my experience (both scenario/purpose and result) w/ the i4.

Maybe I should start a new thread for "Help Jonathan Blow Lots of $ on 4CT!" -- seriously though, I appreciate the support.
The dealer seems interested in negotiating, so could be promising.
(By contrast, of the other two candidates ... one immediately replied when I asked for the build sheet, yet has not responded to the q's I emailed him two nights ago ... another has the window sticker posted on-line, but appears to be a screen capture, and has not responded to my request for a better resolution.)
As for the wheel discrepancy, I've seen that in other listings: the dealership automatically populates the listing with all the standard specs, even if in contradiction with the actual build. Plus the pictures clearly show 21".
Perhaps if any of you locals have 20" yet would prefer 21" at no cost, we could have the dealership conduct a transplant operation on side-by-side lifts!

 

[WasserGKuehlt]

^ Thanks for the confirmation on L1 charging. Exactly my experience (both scenario/purpose and result) w/ the i4.

Maybe I should start a new thread for "Help Jonathan Blow Lots of $ on 4CT!" -- seriously though, I appreciate the support.
The dealer seems interested in negotiating, so could be promising.
(By contrast, of the other two candidates ... one immediately replied when I asked for the build sheet, yet has not responded to the q's I emailed him two nights ago ... another has the window sticker posted on-line, but appears to be a screen capture, and has not responded to my request for a better resolution.)
As for the wheel discrepancy, I've seen that in other listings: the dealership automatically populates the listing with all the standard specs, even if in contradiction with the actual build. Plus the pictures clearly show 21".
Perhaps if any of you locals have 20" yet would prefer 21" at no cost, we could have the dealership conduct a transplant operation on side-by-side lifts!

Took a closer look. It's a highly optioned build, so IMO looks like good value.

 

[Jonathan S.]

Took a closer look. It's a highly optioned build, so IMO looks like good value.

Thanks!
My main concern is that it's already used up 37% of the warranty mileage.
And as for time, the warranty would be used up by the end of 2025. I doubt that buying an extended warranty is ever a good deal, but with a complex EV, especially a Porsche, I'm worried that some repair in 2026 could be prohibitively expensive out of warranty.
Although of course I could just sell it in that case, albeit for not much of a price if in need of a repair...

I added a second tab to my spreadsheet here:

www.tinyurl.com/Used4CT​

Building up the same spec now, for the options that have value to me, would be $126,400, or $128,780 if I can get the Infiniti dealer to swap in 20" tires.
(The other amusing calc is that ~$18k in options have zero value to me, but alas that is almost inevitable with Porsche a la cart options!)

The only missing wishlist option that I really care about is the seat massage, but that 14-way driver seat is so marvelous that I doubt I'll miss the seat massage that much -- plus can't drive for more than 3 hrs straight w/ the Taycan range anyway!
I also took at stab in the spreadsheet about calculating the new vs used cost net of eventual resale value, but so speculative as to be nearly worthless, except that buying used would ultimately be *more* costly only under some really strange scenarios.

 

[whitex]

Based on a quick glance, the photo shows the 21" Design Aero blade wheels, but the description mentions 19" Aero. Not a good sign.

Original window sticker also lists 21", so either they swapped them after taking pictures, or the car comes with a spare winter set, or maybe a copy paste error. Dealers are amazingly uninformed about the used cars they are selling, even if it's their own brand (this is not a Porsche dealer). I'm sure an inquiry asking about it would clarify - maybe ask the sales person to go snap a picture of what's on the car today.

 

[Jonathan S.]

^ Yes, my hunch is that the original owner traded this in for a new Infiniti, and the dealership accepted it without having much knowledge of its resale prospects, and is now ready to deal.
("As far as the wheels, seems like you have that dialed in and could do that there if there was the price concession or easy solution" -- he clearly didn't want to get into the details of my "9Jx20 ET54 front + 11Jx20 ET60 rear, 5x130 bolt pattern, 71.6 bore" parenthetical aside!)

 

[whitex]

("As far as the wheels, seems like you have that dialed in and could do that there if there was the price concession or easy solution" -- he clearly didn't want to get into the details of my "9Jx20 ET54 front + 11Jx20 ET60 rear, 5x130 bolt pattern, 71.6 bore" parenthetical aside!)

Something is weird. Description says 19” wheels, sticker and pictures are 21”, sales rep says 20”. This might mean they are clueless, possibly a good negotiation opportunity. Did you ask the guy to just take a picture with his phone?

 

[Jonathan S.]

^ My fault for the confusion on that: the sticker and pictures are both 21". The description says 19" but I've seen many (many) used 4 CT listings that just copy the base spec, even when that material is essentially overridden by the particular build. The reference to 20" was from my email, since my plan is to eventually swap out the 21" for 20". (I've been in touch with some 20" sellers, although if anyone with 20" wants to do a transplant operation to receive a no-cost upgrade to 21", this might be your big chance!)

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