911Jeff

Today for the first time, while on a small road trip, my charge level hit 20%. I only had a few miles left to go to get home, but I experienced several “no / low responses when trying to accelerate. When I got home I was unable to direct charge, The screen said that the battery was too low to direct charge. The programmed charge was the only option. At 50% charged, the direct charge was still unavailable.
Is this some power saving scheme? I still had an indicted 42 miles of range remaining.
(MyTaycan is a 2021 RWD with the recent software update).

white6speed

I hope not

daveo4porsche

no it is not normal

I have not experience "low power" acceleration until you are much closer to 10% (I've been as low as 3%) - I've never experienced any problems charging due to low battery percentage - time for a dealer/service visit in my opinion.

991carreradriver

I direct charged twice below 10% this weekend. Once on a DC and once at home and no direct charge anomaly.

white6speed

What is the typical charge time with a 240 volt charger say at 50%. I needed 12 hours at 50 % for full charge to 100%.

daveo4porsche

Taycan is a usable 83.4 kwh (so we'll call it 84 kWh)
50% of 84 is 42 kWh

normal 40 amp full charge rate is 9.6 kW - so we need 42 kwh and the rate of charge is 9.6 kWh per hour

42 / 9.6 = 4.3 hours - charging is not 100% efficient - so we'll round that up to 5 hours to deal with charging losses/overhead

with Porsche "fix" in place their EVSE now charges at a rate of 4.8 kwh per hour of charge so...2x the time

42 kWh needed
charge rate 4.8 kW

42 / 4.8 = 8.75 hours - charging overhead/loss means it will take 9 1/4 to 9 1/2 hours to do a 50% charge on the Taycan

daveo4porsche

50% charge should be less than 6 hours at a full 40 amps @ 240 volts - at a full 40 amps @ 240 volts Porsche specifies a full charge will take less than 10 hours - 12 hours means you're running a handicapped 240V/40 amp charger (which means you're not getting a full 40 amps).

but that's assuming your 240V EVSE is configured/installed/provisioned for 40 amps

please review the posting below were I lay out how long it takes to charge a Taycan at various charge rates

https://rennlist.com/forums/taycan/1...from-blah.html

daveo4porsche

there are numerous high quality alternatives to the Porsche EVSE that can/do operate at full capacity with _NO_ issues of safety or overheating - there are viable alternatives to the now-nerfed/maligned PMC+/PMCC from Porsche that can operate at a full 40 amps (9.6 kW) for as little as $200, or many choices in the $400-$800 range.

I am personally disappointed in Porsche in this aspect of Taycan/EV because this is not rocket science and there are numerous examples of EVSE's that charge at full rate that are reliable and do not overheat or have issues…

Porsche's EVSE is big, bulkly, finicky, and now handicapped and also the most expensive unit on the market (if you attempt to purchase a 2nd Porsche PMCC for a vacation home for example it costs well over $3000 and is perhaps the worse EVSE on the north american market). Viable and ultra reliable units can be had for $200-$1500 vs. Porsche's offering at over $3000 "real cost" if not included with the vehicle.

If Porsche's EVSE was not included with the vehicle there is no way I (or many other Taycan owners) could/would recommend it as your EV charger.

daveo4porsche

a short list (but not exhaustive) of top EVSE alternatives to charge your Taycan can be found in this thread as a place to start - of you can find one on your own - but the major point is you're not stuck with the Porsche unit…or it's abysmal performance…any North American J-1772 EVSE can charge your Taycan and there are numerous alternatives

https://www.taycanforum.com/forum/th...3/#post-196796

post #4 is a list of top alternatives - any one of which is better, cheaper, higher quality, and more effective than the Porsche PMC+/PMCC.

daveo4porsche

where were you charging?
what EV charger (EVSE) were your using?
and if you were charging at home what is the circuit breaker "size" on the EV charging circuit?
what did the in-car charging rate "show" in terms of kW on the lower center panel during the charging session?

all of this is data required to know what the ideal/optimal charge rate could be?

my home chargers charge my Taycan at 240V/48 amps - or 11 kW charge rate - that is normal/optimal - anything less than that charge rate is an un-expected result.

the charger at the Valley Fair mall at 208V/30 amps - or 6 kW charge rate - I would expect the same charge to take twice as long at valley fair vs. home

if you were at a 350 kW Electrify America fastDC charging station runinng at full capacity - 30 min or less would be "normal" expected…anything more than that would mean the charge rate is reduced for some reason.

it can be "normal/expected" for the Taycan to take 12 hours to charge - if you're charging off a 240V/20 amp circuit
it is not "normal/expected" for the Taycan to take 12 hours to charge if you're charging off of a 240V/40 amp circuit (9 hours covers 0-100%, it does have a big enough battery to take 12 hours)

the "normal" home residential EV charging installation is a NEMA 14-50/6-50 power socket - which is rated for 240V/50 amps - EV chargers only get to use 80% of that capacity for thermal safety - so all EVSE's (EV chargers) only use 40 amps on a 50 amp circuit - 240V * 40 amps = 9.6 kW - that is maximum/optimal/ideal capacity on a NEMA 14-50/6-50 north american residential home electrical circuit.

the next variable is what can my EV charger do? ChargePoint sells 32 amp chargers that plug into a 14-50/6-50 socket - so even though you're plugged into a 40 amp socket, your EV charger could only be using 32 amps (or 7.68 kW of the 9.6 kW capacity - this is allowed/normal/expected…so it will charge slower than a full 9.6 kW EV charger because it's using less capacity…but the same circuit.

most people with Taycan have the following:

a NEMA 14-50 socket
the Porsche PMC+/PMCC EV charger (EVSE)

which under normal circumstances will charge the Taycan at 9.6 kW…

that was true until recently…when Porsche "nerfed" their EVSE and lowered it's default charge rate from 40 amps (9.6 kW) to 20 amps (4.8 kw) - this was a "free" "fix" for the PMC+/PMCC's overheating problems which are well known and simply caused by Porsche cost reducing their powersupply cable (probably to save $2.30 on a $8.00 component in a $3200 EVSE retail priced component)

so as of about 70 days ago - your Porsche PMCC was a 9.6 kW charger - this is no longer true it is now a 4.8 kW charger so that it won't overheat and melt…this will double the amount of time it takes to charge your Taycan - Porsche feels this is a great solution to their problem and has done a ****-poor job informing people as to why/how/WTF this change was about…but if you're using their charger - it is no longer as "fast" as it used to be.

so for a given setting of voltage/amps it could be "normal" to take 12 hours to charge your Taycan

the real question is: Is that duration ideal/optimal based what the charger should be charging at?

and for that we need to know the following answers:

• where were you charging?
• what EV charger (EVSE) were your using?
• and if you were charging at home what is the circuit breaker "size" on the EV charging circuit?
• what did the in-car charging rate "show" in terms of kW on the lower center panel during the charging session?

once we have answers to the 4 questions above -I can tell you if you are charging as fast as possible or if you're running at an artificially reduced rate…

911Jeff

I awole to this?
service appointment scheduled

AlexCeres

That looks normal

/s

911Jeff

255% of what?

daveo4porsche

something is messed up somewhere - in software 255 is an auspicious number - it's typically caused by a coding error of some kinda - it's unlikely 255 is ever a valid number in this context - software fault - will probably go away on it's own.

991carreradriver

^^^^ Learn something new everyday!