Uneven home charging issue using Porsche Mobile Charger Connect?

[Gronk]

I have a dedicated 50A charging circuit in my garage that I use for my 2020 Porsche Taycan 4S. I have configured my Porsche Mobile Charger Connect for 40A.

Recently, I’ve noticed that my charging speed overnight fluctuates between 7 and 8.5kW instead of the consistent 9.5kW I used to get. Additionally, in the morning I receive a My Porsche notification indicating that my set charge level couldn’t be reached.

The charging graph in My Porsche shows this significant variation in the charging rate. However, looking at my charging history I saw a more consistent charge two weeks ago. I’ve attached 2 screenshots of the charging graphs to show the difference.

Has anyone else encountered this issue before?

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[daveo4EV]

I have a dedicated 50A charging circuit in my garage that I use for my 2020 Porsche Taycan 4S. I have configured my Porsche Mobile Charger Connect for 40A.

Recently, I’ve noticed that my charging speed overnight fluctuates between 7 and 8.5kW instead of the consistent 9.5kW I used to get. Additionally, in the morning I receive a My Porsche notification indicating that my set charge level couldn’t be reached.

The charging graph in My Porsche shows this significant variation in the charging rate. However, looking at my charging history I saw a more consistent charge two weeks ago. I’ve attached 2 screenshots of the charging graphs to show the difference.

Has anyone else encountered this issue before?

this could be a nubmer of things - but also may indicate thermal stress and damage on the charging cord(s) - the power supply cable, NEMA socket, and charging cord from the EVSE to the vehicle operate at high thermal loads and over time may degrade causing increased electrical resistance…

I would inspect:

• the NEMA socket where the EVSE is plugged in
• the NEMA plug itself
• the charging port on the vehicle
• the charging plug on the end of the charging cord

you're looking for any signs of thermal stress - discloration of metal bits - plastic melting or inconsistent plastic surface texture indicating past thermal heating/cooling cycles - charge rates like this will vary when the electrical connections are beginning to fail due to increased electrical resistance as the plastics in the connectors allow more "play" due to thermal stress allowing them to flex or simply melt into slightly different positons over time…

the components of an EV charging system/circuit are normally plastic of some nature - as the EVSE is charging the vehicle the components heat up due to normal electrical currents and their loads - this is normal and expected - but all materials expands when heated and contract when cooled - over time the natural and expected heat-cool/expand-contract cycle causes things to shift and become deformed - these accumulated "shifts" caused by repeated expansion/contraction behaviors can lead to electricla connections not having the correct position and while still operating and conducting current, doing so with increased resistance, this increased the heat cause even more "melting" amplifying the deformation process during the expected heat/cool cycle - causing more deformation - rinse. lather, repeat - voltage fluctuations can be sign of increased electrical resistance and a strong indications we're approaching failure points…this is caused by years of heat/cooling cycles deforming the plastic components…

the Porsche EVSE has very high nominal operating temperatures vs. other non-Porsche EVSE's…this requires higher grade components with greater tolerances of thermal loads to avoid long term thermal stress issues leading to problems…

I prefer an EVSE that operates at cooler temperatures placing less thermal demand on the electrical circuit it's operating with. Porsche's approach is to make sure everything can handle the load, my approach is to use a less demanding EVSE…YMMV

I would also charge the car with another EVSE and see if the charging behavior is repeated

also try using the other charging port on the opposite side of the car and see if you have problems…

is your NEMA socket a Hubble commerical grade electrical socket like Porsche recommends? If not that could be your problem and your electrical socket is starting to fail due to the high thermal loads the Porsche EVSE operates at…

this historical FAQ may shed insight

https://www.taycanforum.com/forum/t...uide-to-the-porsche-evse-pmc-pmcc-pwcc.13886/

has your EVSE had the recall service performed? is it the newer more robust power supply cable or the old power supply cable known to have thermal operating challenges?

good luck!

 

[daveo4EV]

https://www.taycanforum.com/forum/t...ehicle-side-charging-cable-dec-18-2023.18826/

https://www.taycanforum.com/forum/t...e-failure-in-fixed-pmc-october-30-2024.22242/
https://www.taycanforum.com/forum/threads/tsb-wpu1-–-pmc-supply-charging-cable-with-nema-power-plug-and-updating-charger-software-july-5-2024.20778/
https://www.taycanforum.com/forum/threads/tsb-ac-charging-not-possible-july-19-2024.20036/
https://www.taycanforum.com/forum/threads/tsb-for-recall-apb6-–-charging-cable-porsche-mobile-charger-with-nema-plug-may-17-2024.20018/
https://www.taycanforum.com/forum/t...process-cannot-be-started-march-4-2024.19542/
https://www.taycanforum.com/forum/t...right-side-charge-socket-march-12-2024.19497/
https://www.taycanforum.com/forum/threads/tsb-troubleshooting-ac-charging-nov-6-2023.18233/
https://www.taycanforum.com/forum/t...-overtemperature-condition-nov-17-2023.18230/
https://www.taycanforum.com/forum/t...d-fault-troubleshooting-august-21-2023.17305/
https://www.taycanforum.com/forum/t...charger-plus-pmc-red-leds-july-18-2023.16900/
https://www.taycanforum.com/forum/threads/porsche-tsb-troubleshooting-charging-jan-31-2023.15197/
https://www.taycanforum.com/forum/t...-bugs-loss-of-power-setting-jan-3-2023.15173/
https://www.taycanforum.com/forum/t...ging-cable-porsche-mobile-charger-wnm6.13990/
https://www.taycanforum.com/forum/threads/tsb-on-board-charger-fault-“charging-socket-–-overtemperature”-with-pmcc-or-pmc-nov-2023-update.13977/
https://www.taycanforum.com/forum/t...orsche-mobile-charger-wmp2-sep-21-2022.13832/

 

[daveo4EV]

I have a dedicated 50A charging circuit in my garage that I use for my 2020 Porsche Taycan 4S. I have configured my Porsche Mobile Charger Connect for 40A.

Recently, I’ve noticed that my charging speed overnight fluctuates between 7 and 8.5kW instead of the consistent 9.5kW I used to get. Additionally, in the morning I receive a My Porsche notification indicating that my set charge level couldn’t be reached.

The charging graph in My Porsche shows this significant variation in the charging rate. However, looking at my charging history I saw a more consistent charge two weeks ago. I’ve attached 2 screenshots of the charging graphs to show the difference.

Has anyone else encountered this issue before?

given 5+ years of PMC+/PMCC experience in North America I believe many many Taycan owners would agree to the following steps:

• inspect the NEMA socket for signs of thermal stress - replace/upgrade as necessary
• if your NEMA socket is _NOT_ a hubble commerical grade socket or the Leviton EV rated socket - replace it immediately - normal grade NEMA sockets are not up to the task of muti-hour EVSE usage and will eventually fail
  • Porsche has documented their recommendation of using Hubble commerical grade NEMA sockets with part numbers - don't believe me? great! Believe Porsche!
• inspect the charging ports on your Taycan and make sure there is no sign of thermal stress on the charging ports - if there are signs of thermal stress on the vehicle's charging port(s) you may have to consider having the charging ports repaired/replaced - out of warranty this is pricy option so YMMV and it's a personal decision and a personal finance challenge
• take your PMC+/PMCC and pack it away someplace dark, cool, and hard to reach so that your not tempted to use it ever again…
  • you should also verify your 2020 Porsche EVSE has had the power supply cable recall performed - original units have a known issue with thermal loads and factory supplied components for which there is a document recall and replacement components available that mitigate the thermal load issues
  • even with the recall performed my personal opinion is that the Porsche EVSE is still a "sh*t" product and should be ignored - but others have different opinions.
• purchase one of many many excellent non-Porsche alternative EVSE's and live a happy life knowing you won't have to deal with the multitude of _KNOWN_ and _DOCUMENTED_ issues with this particularly horrible Porsche product…the history is there and the facts are well understood - this product has a lot of problems…

it's important you inspect your charging circuit components for signs of thermal stress…that is the most likely cause of the fluctuations you are seeing…failure to resolve the thermal stress problems may lead to thermal failure one morning or overnight which could be spectacular (not in a good way)…thermal stress is not the only reason for this type of behavior - but it's the most common reason - actual diagnosis of root cause is tricky and best done with multiple EV's and alternative EVSE's - because it could be many things: your charging circuit, your EVSE, your vehicle, your vehicle's OBC - to isolate the actual reason requires you substitute each of these components with alternatives to see if the problem goes away and if it does then you've found the culpret…

the most likely and most common reason for these problems is however increased electrical resistances due to accumulated thermal stress given the high nominal operating temperatures of the Porsche EVSE components - over time these thermal loads can lead to failure of the charging system(s) and normally a melted NEMA socket…

but I must stress that's just _ONE_ possible explanation - and there are other reasons this could be happening - isolating those reasons is best done by having another EVSE to use and see if has the same the problem…this first diagnostic step would isolate the problem to either the EVSE or the Vehicle…

but probability and commonality is this is a electrical circuit thermal load stress problem…but it could be something else more difficult to isolate.

that's my $0.02 - YMMV - good luck

 

[B61]

David actually put few hundreds into this thread (again), while I’ll add $0.02 with my experience.
When in my case charging power dropped (from 9kw to 5-6kw), charging unit failed and they replaced it.
you can also make selftest: go to fast charger and it will stop in a minute or two…or it won’t start at all…

 

[Gronk]

Thank you so much for your responses. Here are my comments, please let me know if I am on the right track.

I took a careful look at the outlet, Taycan charging port, and both ends of the charger; I don’t see any issues with heat and melting. Although I don’t have the Hubbell socket, I do believe it’s commercial grade.

I did notice that the charger reports 39.9A/40A on the screen the whole time, and I see the same reduced speed when charging the other side port on the Taycan.

Based on the great feedback here, I think my next tests are to:

1. Charging to 100% to see if any errors crop up
2. Fast charge to 80% at a nearby public charger
3. Use OBD diagnostic to see if the Taycan is reporting any errors
4. Buy a separate EVSE to test

#4 comes with some cost, so I will investigate after the first 3.

Any additional advice on my plan?

this could be a nubmer of things - but also may indicate thermal stress and damage on the charging cord(s) - the power supply cable, NEMA socket, and charging cord from the EVSE to the vehicle operate at high thermal loads and over time may degrade causing increased electrical resistance…

I would inspect:

• the NEMA socket where the EVSE is plugged in
• the NEMA plug itself
• the charging port on the vehicle
• the charging plug on the end of the charging cord

you're looking for any signs of thermal stress - discloration of metal bits - plastic melting or inconsistent plastic surface texture indicating past thermal heating/cooling cycles - charge rates like this will vary when the electrical connections are beginning to fail due to increased electrical resistance as the plastics in the connectors allow more "play" due to thermal stress allowing them to flex or simply melt into slightly different positons over time…

the components of an EV charging system/circuit are normally plastic of some nature - as the EVSE is charging the vehicle the components heat up due to normal electrical currents and their loads - this is normal and expected - but all materials expands when heated and contract when cooled - over time the natural and expected heat-cool/expand-contract cycle causes things to shift and become deformed - these accumulated "shifts" caused by repeated expansion/contraction behaviors can lead to electricla connections not having the correct position and while still operating and conducting current, doing so with increased resistance, this increased the heat cause even more "melting" amplifying the deformation process during the expected heat/cool cycle - causing more deformation - rinse. lather, repeat - voltage fluctuations can be sign of increased electrical resistance and a strong indications we're approaching failure points…this is caused by years of heat/cooling cycles deforming the plastic components…

the Porsche EVSE has very high nominal operating temperatures vs. other non-Porsche EVSE's…this requires higher grade components with greater tolerances of thermal loads to avoid long term thermal stress issues leading to problems…

I prefer an EVSE that operates at cooler temperatures placing less thermal demand on the electrical circuit it's operating with. Porsche's approach is to make sure everything can handle the load, my approach is to use a less demanding EVSE…YMMV

I would also charge the car with another EVSE and see if the charging behavior is repeated

also try using the other charging port on the opposite side of the car and see if you have problems…

is your NEMA socket a Hubble commerical grade electrical socket like Porsche recommends? If not that could be your problem and your electrical socket is starting to fail due to the high thermal loads the Porsche EVSE operates at…

this historical FAQ may shed insight

https://www.taycanforum.com/forum/t...uide-to-the-porsche-evse-pmc-pmcc-pwcc.13886/

has your EVSE had the recall service performed? is it the newer more robust power supply cable or the old power supply cable known to have thermal operating challenges?

good luck!

 

[Tooney]

+1

 

[daveo4EV]

Thank you so much for your responses. Here are my comments, please let me know if I am on the right track.

I took a careful look at the outlet, Taycan charging port, and both ends of the charger; I don’t see any issues with heat and melting. Although I don’t have the Hubbell socket, I do believe it’s commercial grade.

I did notice that the charger reports 39.9A/40A on the screen the whole time, and I see the same reduced speed when charging the other side port on the Taycan.

Based on the great feedback here, I think my next tests are to:

1. Charging to 100% to see if any errors crop up
2. Fast charge to 80% at a nearby public charger
3. Use OBD diagnostic to see if the Taycan is reporting any errors
4. Buy a separate EVSE to test

#4 comes with some cost, so I will investigate after the first 3.

Any additional advice on my plan?

your socket is not Hubble or Leviton EV rated…so lit's likely not commercial grade - Electricians are woefully under informed on this topic - the majority of NEMA sockets installed are simply not rated for 4+ hours of constant 9.6 kW 240V/50-40 amp loads - the thermal loads are unlike any other home appliance/device and you need the most robust socket possible…

I see no obvious thermal stress in your photos - do you have a picture of the other charging port on the vehicle - or is the passenger side port the one you use most often?

if you feel like it we could also use a photo(s) of your charging connector - the end that plugs into the vehicle - again looking for signs of thermal wear/tear/stress…

below are 3 choices from amazon all of which are clearly EVSE rated - given the "logo" on the plugs…but your plug looks ok - but still better safe than sorry…

https://www.amazon.com/Hubbell-9450A-50a-120-volt-Receptacle/dp/B00EN9VO7W/ref=sr_1_6?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-6

https://www.amazon.com/LIDER-Weather-Resistant-Receptacle-Electric-Charging/dp/B0FHZSY9KY/ref=sr_1_2_sspa?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

https://www.amazon.com/Leviton-Charging-Receptacle-Outlet-1450R/dp/B0CS8FFC1W/ref=sr_1_7?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-7

the problem could also be behind the NEMA socket where the wires connect to the NEMA outlet - have a licensed and certified electrician inspect that for you - if the connectors have come loose behind the socket that would cause electrical resistance leading to wonky charing behavior…

ChargePoint Flex EVSE is $599 and can be delivered before XMAS and is plug/play with your Taycan - and only slightly more expensive than an electrician visit…

https://store.chargepoint.com/product/home-flex-14-50

it's. top rating and well regarded EVSE with good app/wifi support and great reliability…it's literally plug&play and an easy install with great statistics and charge session reporting.

good luck and thanks for the photos - from what I see thermal stress is not leaping out as root cause but you never know what is going on inside the NEMA socket during a charging session…

 

[Gronk]

your socket is not Hubble or Leviton EV rated…so lit's likely not commercial grade - Electricians are woefully under informed on this topic - the majority of NEMA sockets installed are simply not rated for 4+ hours of constant 9.6 kW 240V/50-40 amp loads - the thermal loads are unlike any other home appliance/device and you need the most robust socket possible…

I see no obvious thermal stress in your photos - do you have a picture of the other charging port on the vehicle - or is the passenger side port the one you use most often?

if you feel like it we could also use a photo(s) of your charging connector - the end that plugs into the vehicle - again looking for signs of thermal wear/tear/stress…

below are 3 choices from amazon all of which are clearly EVSE rated - given the "logo" on the plugs…but your plug looks ok - but still better safe than sorry…

https://www.amazon.com/Hubbell-9450A-50a-120-volt-Receptacle/dp/B00EN9VO7W/ref=sr_1_6?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-6

https://www.amazon.com/LIDER-Weather-Resistant-Receptacle-Electric-Charging/dp/B0FHZSY9KY/ref=sr_1_2_sspa?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

https://www.amazon.com/Leviton-Charging-Receptacle-Outlet-1450R/dp/B0CS8FFC1W/ref=sr_1_7?crid=1M64E5VX459D1&dib=eyJ2IjoiMSJ9.yUOXtAuaMfRkYJXXu8y1SvqnMQpvMWqcGyB9tCpkIbTHnLQ4nbpTyeVe--7odSBzw8zcEiAjAFBGDfS87LzTQ_SYA1m_qBj6dMhE3piTL8jUQEXRf3WrrJBmP8-ElCRQ3_a28DoYt0k4XZK03tBjGjujGLZeiZS2cW-0paKhjTQ5RdLmz5nOPN4QCRcNkVTjyGqxS5gPJU9k0jIolC6qYBO-QFRGHRn18SjVNoQ3Uo8dJRoFe0id5y0dkQECIOQ0-rccAPTxMhnp2BfmlvJimLbJsI80uuz-MT0d_67szR0.JAm-3M3ifXU0tU6_53k7fPDkg80zPFaTyUwTN4DwyNc&dib_tag=se&keywords=hubble+nema+14-50&qid=1764959407&sprefix=hubble+nema+14-50,aps,166&sr=8-7

the problem could also be behind the NEMA socket where the wires connect to the NEMA outlet - have a licensed and certified electrician inspect that for you - if the connectors have come loose behind the socket that would cause electrical resistance leading to wonky charing behavior…

ChargePoint Flex EVSE is $599 and can be delivered before XMAS and is plug/play with your Taycan - and only slightly more expensive than an electrician visit…

https://store.chargepoint.com/product/home-flex-14-50

it's. top rating and well regarded EVSE with good app/wifi support and great reliability…it's literally plug&play and an easy install with great statistics and charge session reporting.

good luck and thanks for the photos - from what I see thermal stress is not leaping out as root cause but you never know what is going on inside the NEMA socket during a charging session…

Thanks for all the helpful and detailed advice, it’s much appreciated. Here is a photo of the charger plug, I don’t see any discoloration or obvious damage.

I‘m a cheapskate, but I bit the bullet to buy the Chargepoint charger you recommended; at least it’s free returns if it doesn’t help.

So if the Chargepoint charger has the same issue, the problem lies either in my electrical wiring or the car itself, right? Too bad I don’t have another EV to test with

 

[daveo4EV]

Thanks for all the helpful and detailed advice, it’s much appreciated. Here is a photo of the charger plug, I don’t see any discoloration or obvious damage.

I‘m a cheapskate, but I bit the bullet to buy the Chargepoint charger you recommended; at least it’s free returns if it doesn’t help.

So if the Chargepoint charger has the same issue, the problem lies either in my electrical wiring or the car itself, right? Too bad I don’t have another EV to test with

it could just be the photo but the ground in the photo doesn’t look entirely healthy- the connector at 6 o’clock position is the ground - and the 120 volt connector at 10 pm also doesn’t look entirely happy either _ it’s looks like corrosion vs thermal - but again hard to tell

if the connector is worn that could explain the results you are seeing - and porsche will charge you more than the charge point charger to replace it …

but again the picture isn’t good enough for conclusive analysis

mt $0.02

 

[Genau]

if the connector is worn that could explain the results you are seeing - and porsche will charge you more than the charge point charger to replace it …

Actually, Porsche is replacing the vehicle-side cable under recall. Unfortunately the replacement cables aren’t currently available, according to my dealership.

Factory Recall Campaign ​

WRA6 Replacing vehicle charging cable on the Porsche Mobile Charger 2​

 

[Gronk]

Here’s an update. I bought a Chargepoint charger and have been testing it for the last week. Short summary is that I’m seeing a bit more consistency when charging, but still seeing small spikes and a small drop in max charging speed (9.3kW instead of 9.6kW expected).

I also had my wiring inspected by my licensed electrician, and he assures me no issues with the internal wiring; I may end up upgrading the outlet anyway to the Hubbell EV outlet.

Please see screenshots of my last 2 charging sessions.

Is this lowered charging speed normal for the current spell of cold weather; anyone else experience this? Or does this point to an issue within the car itself? If yes, would it be reported over OBD? I have an extended warranty, so it’s not a problem to bring it to my dealer’s attention.

 

[daveo4EV]

Here’s an update. I bought a Chargepoint charger and have been testing it for the last week. Short summary is that I’m seeing a bit more consistency when charging, but still seeing small spikes and a small drop in max charging speed (9.3kW instead of 9.6kW expected).

I also had my wiring inspected by my licensed electrician, and he assures me no issues with the internal wiring; I may end up upgrading the outlet anyway to the Hubbell EV outlet.

Please see screenshots of my last 2 charging sessions.

Is this lowered charging speed normal for the current spell of cold weather; anyone else experience this? Or does this point to an issue within the car itself? If yes, would it be reported over OBD? I have an extended warranty, so it’s not a problem to bring it to my dealer’s attention.

yes the car will drop charging speed sometimes for various reason undisclosed to the general public - the car sometimes takes "a break" on the max charging speed to let things "settle" and see where it is in the charging process - the drop could also be due to battery conditioning and temperature maintenance - the "draw" from the charger may not always be to charge the battery - it may be a draw to run battery thermal equipment which has less demand than the OBC AC/DC converter to actually charge the battery…what goes inside the mind of Porsche' battery charging software is only slightly less opaque than what your spouse/partner is thinking at any given moment

on reason that porch will 'drop' the charge rate is that the German's are precise - and their charging software optimizes for exact-time-finish - if you have a profile/timer set for 6 am - they do not start the charging session until the exact time it would take to reach 6 am at the designated SOC…during the charging session they can sometimes be ahead or behind schedule due to various factors - so they will slow down the charge rate if they are predicting they will finish "early"…the software is trying to be precise and that sometimes means stopping a charging session mid-session to avoid being 2 minutes "early"…this are other factors like battery conditioning being done during the session can lead to non-flat line charging session.

your charging curves look good to me and are not as flaky as the Porsche EVSE…

 

[daveo4EV]

I may end up upgrading the outlet anyway to the Hubbell EV outlet.

I know this is a pain in the ass and we sound like chicken little - but there is a LOT of history here - and it's proven to be a risky move…

please consider swapping your plug to a EV rated outlet sooner rather than later…it's a serious issue if thing go sideways…

https://www.taycanforum.com/forum/t...porsche-evse-pmc-pmcc-pwcc.13886/#post-215303

below is just _ONE_ example of many about what happens to "lesser" NEMA 14-50 sockets that are not up to the task of running full tilt 240V@40 amps for hours on end day and day out…

this actually happened to a Taycan owner and it's not an isolated incident - we are not chicken little on this issue.

a Hubble commercial grade socket or Leviton EV rated outlet is best practice for running a 50/40 amp EVSE and this is based on years of actual experience with lesser socket failures - some leading to home fires…

 

[daveo4EV]

I may end up upgrading the outlet anyway to the Hubbell EV outlet.

please review Porsche's own requirements/recommendation from their 2022 Technical bulletin

https://www.taycanforum.com/forum/t...-related-porsche-ntsb-article-analysis.13902/

https://static.nhtsa.gov/odi/tsbs/2022/MC-10222530-0001.pdf

page 2 of 11 from the above official Porsche PDF

https://www.taycanforum.com/forum/threads/warranty-on-the-porsche-charger.16905/page-2#post-259876

https://rennlist.com/forums/taycan/1408300-home-charging-question.html

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