[North America] - Porsche's official guides to charging

[daveo4EV]

there have been a few technical documents published by Porsche on North American Charging.

They are factual well written, and specific - highly recommend reading them to hear directly from Porsche on best practices for charging an EV.

• Best Practices for home charging in North America: https://static.nhtsa.gov/odi/tsbs/2022/MC-10222530-0001.pdf
• Supercharger Access Announcement: https://newsroom.porsche.com/en_US/...ow-access-the-tesla-supercharger-network.html
• ChargePoint Access to the Porsche Charging Service: https://newsroom.porsche.com/en_US/..._chargepoint_into_charging_service-36491.html
• Factors that affect fast charging speed: https://ask.porsche.com/us/en-US/charging-speed/
• TI date: 2022.Apr.05 , MY 2021: Technical information for recommendations and measure for storing electric vehicles.
  TI date: 2022.Apr.05 , MY 2022: Instructions on advanced technical information for parking or storing a Taycan.

this thread is specifically for Porsche official links regarding EV charging…I welcome suggestions for additional Porsche authored articles.

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[daveo4EV]

thanks to @Tooney for additional article suggestions - the only forum member that argues with me at 1 am

 

[cometguy]

It's interesting that the MY2022 storage recommendations say to lock the car, whereas the MY2021 recommendations don't mention that. I've left my car for 2-3 weeks at a time in my garage unlocked when away from home. I wonder what the point of locking it would be, in terms of draining the battery... It's also interesting to see Porsche recommend 20%-50% SoC when parking the car unused for weeks; I'd always heard 40%-60% SoC elsewhere.

 

[daveo4EV]

It's interesting that the MY2022 storage recommendations say to lock the car, whereas the MY2021 recommendations don't mention that. I've left my car for 2-3 weeks at a time in my garage unlocked when away from home. I wonder what the point of locking it would be, in terms of draining the battery... It's also interesting to see Porsche recommend 20%-50% SoC when parking the car unused for weeks; I'd always heard 40%-60% SoC elsewhere.

this fits with my general opinion/experience that _ANYTHING_ to do with Battery Health is generally a "SWAG"

SWAG = Scientific Wild Ass Guess

SWAG is used to describe an estimate derived from a combination of factors including past experience, general impressions, and heuristic or approximate calculations rather than an exhaustive search, proof, or rigorous calculation. The SWAG is an educated guess but is not regarded as the best or most accurate estimate.[2] The SWAG is not computed or proven rigorously, but the proponent asserts his or her own judgement suffices to rationalize the estimate; and it may, in time, be viable to produce a rigorous forecast of increased precision.[6]

engineers/scientist know certain things affect the longevity of LiON cells, but quantifying it down to a specific value/characteristic is very very difficult…the quantitative difference in longevity between storing a LiON battery at 35% SOC vs. 50% SOC is very very difficult to tease out…

so it's all a giant SWAG - as long as you're in the general area you're doing the best you can.

 

[CraigUrch]

@cometguy I was told by my service advisor that the reason to lock the car is it ensures that all the modules go to sleep.

 

[Tooney]

so it's all a giant SWAG - as long as you're in the general area you're doing the best you can.

SoC, SoH: no precise definitions, not actual physical properties that can be directly measured.
SWAGs, or maybe SWIGs (scientific highly informed guesses).

 

[Gino]

there have been a few technical documents published by Porsche on North American Charging.

They are factual well written, and specific - highly recommend reading them to hear directly from Porsche on best practices for charging an EV.

• Best Practices for home charging in North America: https://static.nhtsa.gov/odi/tsbs/2022/MC-10222530-0001.pdf
• Supercharger Access Announcement: https://newsroom.porsche.com/en_US/...ow-access-the-tesla-supercharger-network.html
• ChargePoint Access to the Porsche Charging Service: https://newsroom.porsche.com/en_US/..._chargepoint_into_charging_service-36491.html
• Factors that affect fast charging speed: https://ask.porsche.com/us/en-US/charging-speed/
• TI date: 2022.Apr.05 , MY 2021: Technical information for recommendations and measure for storing electric vehicles.
  TI date: 2022.Apr.05 , MY 2022: Instructions on advanced technical information for parking or storing a Taycan.

this thread is specifically for Porsche official links regarding EV charging…I welcome suggestions for additional Porsche authored articles.

Unfortunately for Porsche my vehicle was delivered in January 2022 before Porsche released the service bulletin stating that 125V charging is only for emergency use. It was never stated in the documentation at delivery of my 2021 Taycan limiting 125V charging at home for a maximum of 12 hours and only in an emergency to get to a 220/240 or DC charger.
I have brought this up to PNA and they agreed there is no issue using my Porsche 125V charger for as long as I want provided I use the proper outlet specified and the circuit can handle the rated current for the outlet.
Unfortunately I have no way to get 220/240v to my detached garage in my community. It is not allowed for me to dig up common area to run the new line so I’m forced to use my 120V service. I purchased my Taycan knowing how slow charging in my garage would be but would not have purchased if I was told “125V charging is for emergency use only and never for daily charging at home”.
PNA knows if they said I couldn’t charge daily and only for emergencies in my garage retroactive to the date my vehicle was delivered it would be grounds for me to have them take back my vehicle.
Charging slower should never cause damage to the charging system or the HVB. If the Porsche charger can’t take long slow charging the problem is the quality of their charger not slow charging. They have no problem with charging at 240V for as long as you want if you put 300 miles a day with the big battery. The fact cheap outlets were melting at 120V is the homeowner’s issue. Porsche was simply taking the easy position that if you’re going to use a cheap outlet it is less likely to melt with 5-6A at 220/240V for 6 hours vs 10-12A at 120V for 10-12 hours.
The Porsche Charger shouldn’t care and the charging infrastructure in the car should be fine with slow charging unless Porsche has found weaknesses in the external or internal charging components leading to reduced lifetime.
I have been charging for 12-19 hours a day once a week in my garage to give me 160 miles a week that I drive. No melting outlets no problems with the charger or the charging components.
I use both my Porsche 120V charger which chargers at 1.2KW rate and my Lectron Charger which charges at 1.5KW rate. Both work perfectly but the Lectron is 20% faster.
My dealer and PNA told me (verbally) to disregard the service bulletin from Feb/2022 regarding my 2021 Taycan.

 

[cometguy]

Unfortunately for Porsche my vehicle was delivered in January 2022 before Porsche released the service bulletin stating that 125V charging is only for emergency use. It was never stated in the documentation at delivery of my 2021 Taycan limiting 125V charging at home for a maximum of 12 hours and only in an emergency to get to a 220/240 or DC charger.
I have brought this up to PNA and they agreed there is no issue using my Porsche 125V charger for as long as I want provided I use the proper outlet specified and the circuit can handle the rated current for the outlet.
Unfortunately I have no way to get 220/240v to my detached garage in my community. It is not allowed for me to dig up common area to run the new line so I’m forced to use my 120V service. I purchased my Taycan knowing how slow charging in my garage would be but would not have purchased if I was told “125V charging is for emergency use only and never for daily charging at home”.
PNA knows if they said I couldn’t charge daily and only for emergencies in my garage retroactive to the date my vehicle was delivered it would be grounds for me to have them take back my vehicle.
Charging slower should never cause damage to the charging system or the HVB. If the Porsche charger can’t take long slow charging the problem is the quality of their charger not slow charging. They have no problem with charging at 240V for as long as you want if you put 300 miles a day with the big battery. The fact cheap outlets were melting at 120V is the homeowner’s issue. Porsche was simply taking the easy position that if you’re going to use a cheap outlet it is less likely to melt with 5-6A at 220/240V for 6 hours vs 10-12A at 120V for 10-12 hours.
The Porsche Charger shouldn’t care and the charging infrastructure in the car should be fine with slow charging unless Porsche has found weaknesses in the external or internal charging components leading to reduced lifetime.
I have been charging for 12-19 hours a day once a week in my garage to give me 160 miles a week that I drive. No melting outlets no problems with the charger or the charging components.
I use both my Porsche 120V charger which chargers at 1.2KW rate and my Lectron Charger which charges at 1.5KW rate. Both work perfectly but the Lectron is 20% faster.
My dealer and PNA told me (verbally) to disregard the service bulletin from Feb/2022 regarding my 2021 Taycan.

We've been charging three PHEVs plus my Taycan over 7 years now in our garage at only 120 volts. No problems. Our garage was built in 2012, with all new wiring and upgraded ampage. I've not had the desire to upgrade to 240 volts (possible in my case) because I don't need the faster charging for my daily driving needs (like you and many/most other Taycan owners). I have regularly checked my cables after charging my Taycan for 12-24 hours straight, to check for how warm/hot they might be, and they're always only slightly warm (on both sides of the EVSE box), so I don't worry.

 

[Gino]

We've been charging three PHEVs plus my Taycan over 7 years now in our garage at only 120 volts. No problems. Our garage was built in 2012, with all new wiring and upgraded ampage. I've not had the desire to upgrade to 240 volts (possible in my case) because I don't need the faster charging for my daily driving needs (like you and many/most other Taycan owners). I have regularly checked my cables after charging my Taycan for 12-24 hours straight, to check for how warm/hot they might be, and they're always only slightly warm (on both sides of the EVSE box), so I don't worry.

Thanks for confirming the use of 120V charging for daily charging longer than 12 hours.
I have had the exact same experience.
No issues as long as you use a quality outlet which has been properly installed to code.

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