daveo4EV
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- David
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[TLDR]
I've confirmed my 2020 Taycan charges fine and adjusts it's charging rate dynamically when being charged via a JDApter/TeslaTap in a 4 charger Master/Slave/Slave/Slave 100 amp shared circuit Tesla Wall Charger Gen2 home charging situation
there now you don't have to read what's below.
all of my experience is with the North American Tesla Wall Chargers and Tesla UMC Gen1 - I can not speak for other regions
[/TLDR]
as you may or may not know I am a passionate EV adovcate and have owned EV's for over 7 years - Ford Focus, Leaf, Tesla Model S P85, Tesla Model S P85D, Tesla Model X P90D, Tesla Model X 100D, Tesla Model 3 Performance, 2017 Bolt, 2019 Bolt, 2020 Taycan Turbo…never more than 3 or 4 at once but I've owned a few EV's - and put over 350,000 miles on them in a family of 5 with 4 drivers using them for road trips and daily driving duty. I believe all EV's have pros and cons, but on the whole EV's from any manufacturer (done right) offer a compelling alternative to run of the mill gasoline cars that infest our road ways…
As one transitions to EV's you quickly become acclimated to the benefits of an EV and find yourself not willing to go back, once you own one EV, you're going to own another, and that raises the specter of EV charging at home for multiple EV's. If you think planning charging for one EV is tricky, charging 3 or 4 EV's over night with appropriate equipment and electrical capacity easily exceeds the typical capacities for residential electrical loads…
EV charging is best done overnight, at home and rarely using public charging. If you have an EV with 150 miles or more of range this will easily cover 99.9% of most people's daily driving and transitioning to an EV will be relatively painless at first, and advantageous over time as you grow more acclimated to your new EV overlords
The typical driving day is 70 miles or less for 98% of daily vehicle usage. This is easily handled by a home charging configuration and requires about 20 kWh of power overnight. With your typical 40 amp charger (50 amp breaker) this translates to to approximately 2 1/2 hours of overnight charging time…easy, no problem, this is a typical EV garage setup and will serve you well and you will enjoy your EV immensely.
However once you add a 2nd EV (for the wife - cause she loves charging at home and hates the gas station), and then with young adult drivers the Bolt is a great car, and it has all the EV advantages at a lower price point than Tesla, Audi, Porsche, VW - you can easily find yourself with 3 or 4 EV's to charge over night - each requiring 10-20 kWh. And the most direct install would be 4 separate EV chargers - one for each car, but then that's a 50 amp breaker for each EV charger (if you want to charge all 4 cars at once), and that's 200 amps just for the garage!! 200 amps is more than most residential service and is impractical for a multi EV install for 98% of residential situations.
An alternative is to go slower on the charge rate - say 4 12 amp EV chargers, which is one 60 amp breaker (48 amps / 4 = 12 amps) but that penalizes the EV charging when only one or two cars need to charge by slowing down their charge rate to 12 amps even when only one EV is charging.
A potentially better solution is to install multiple EV chargers, but have them share a single breaker. And have those chargers dynamically adjust the load based on how many EV's are actually plugged in, and charging at any given time. This has the advantage of charging one EV as fast as possible, but splitting the available load when multiple EV's are charging at the same time.
Fortunately for the EV community the J-1772 standard for North America was fairly forward looking in this regards and load sharing is a supported feature of the J-1772 standard - which is really really cool for a multi EV household. That means if you can find an EVSE that supports this feature of J-1772 - you only have to install one circuit for your garage (as big as you can handle or pay for) and you can link/share/master/slave multiple EVSE's to "share" that circuit - such that they will split the load while charging multiple EV's, but make the entire available AC-current capacity available when there is only a single EV charging.
There are four EVSE's that I know that support this advanced black-belt EV enthusiast feature (there may be more):
My setup at home is 4 Tesla Wall Chargers Gen2 - One Master, 3 slaves sharing a 100 amp circuit - this allows a maximum charge rate of 80 amps (19.2 kW), and when 4 EV's are charging at once it nicely splits the load such that each EV get's 20 amps (80 / 4) - 4.8 kW for each car.
I've had this setup of a number of years and it's worked well for charging 1-4 EV's all at once - and dynamically adjust the load based the actual draw it see's in use. It also helps optimize charging for EV's with different maximum charge rates - and doesn't "lock you in" to any fixed charge rate purely to allow "sharing". The charge rates of cars I've owned are listed below:
for example if you have a Leaf and Model X charging - the leaf can charge at it's full 16 amps, and the Model X will charge at 64 amps- if the leaf finishes charging first - it's load will drop - EVSE will then adjust the maximum rate for the remaining EV (the Model X) and it will get it's full 72 amp capacity to finish it's charging session.
when charging the Model 3P and the Model X and a Bolt - we have 80 amps / 3 - I've observed each car getting 24 amps - until one car "drops" off or taper's it's charge - and then the remaining capacity gets split for the two remaining cars that are still charging.
the Good news here is that this isn't very expensive, it's in fact not that bad - in that Tesla Wall Chargers are only $500 each - so you can have a 2 or 3 charger setup in your home sharing a single circuit for less than the cost of the Porsche Mobile Charger Connect and have a great home multi-EV charging setup.
My setup works great and all my families EV's can be plugged in and charge with impunity and the EV always get the maximum rate available which optimizes my charging time and does not limit the charge rate unless there are multiple EV charging at the same time.
What did I test?
2nd Test - Plug in the Bolt - confirmed 32 amp charge rate - 7.68 kW
3rd Test - Plug in the 2020 Taycan Turbo - confirmed 10.86 kW charge rate (48 amps)
4th Test - Tesla & Taycan - both got 40 amps
5th Test - TEsla & Taycan charging - unplug the Taycan - 5 min later the Tesla was at full 72 amps
6th Test - Tesla charging at full 72 amps - plug in the Taycan - both cars drop to 40 amps
7th Test - TEsla & Taycan charging at 40 amps each - unplug the Tesla - Taycan ramps up to 48 amps
8th Test - Tesla Charging at 72 amps, plug in Taycan - now both cars are charging at 40 amps - add in the Bolt - each car gets approximately 24 amps
9th Test - 3 cars charging - 24 amps each - Tesla, Taycan, Bolt - unplug the Tesla - Bolt gets 32 amps, Taycan gets 48 amps
10th Test - 4 cars charging - Tesla, Bolt, Taycan, Volt - Volt gets 16 amps, each of the other 3 cars each seem to get 20 amps
11th Test - during test #10 - unplug the Tesla & the Bolt - now the Volt is getting 16 amps, and the Taycan is getting 48 amps
In all cases I tried the Taycan will adjust it's charge rate dynamically with in 5 to 10 minutes and adjust it's charging rate to match the dynamic load currently being managed by the 4 Tesla Wall Chargers - it's the responsibility of the Wall Chargers to coordinate their usage to not exceed the maximum 80 amp total capacity while any number of EV's are charging - and in four years of charging I've never had a breaker trip or seen any consumption usage that exceed the 19.2 kW maximum capacity of my charging circuit.
If you are looking for a future proof advanced home charging setup - I seriously recommend you consider a high quality shared load EVSE setup which will allow you to use your full charging capacity at all times, and also seamless adjust the load dynamically when there are multiple EV's charging at once. It makes owning multiple EV's really really painless and lets each EV maximize it's charge session with out any manual adjustments.
I'm personally very happy with my setup and very gratified that the Taycan seems to play nicely in this setup and responds well to changes in the charging capacity during a charging session.
I've confirmed my 2020 Taycan charges fine and adjusts it's charging rate dynamically when being charged via a JDApter/TeslaTap in a 4 charger Master/Slave/Slave/Slave 100 amp shared circuit Tesla Wall Charger Gen2 home charging situation
there now you don't have to read what's below.
all of my experience is with the North American Tesla Wall Chargers and Tesla UMC Gen1 - I can not speak for other regions
[/TLDR]
as you may or may not know I am a passionate EV adovcate and have owned EV's for over 7 years - Ford Focus, Leaf, Tesla Model S P85, Tesla Model S P85D, Tesla Model X P90D, Tesla Model X 100D, Tesla Model 3 Performance, 2017 Bolt, 2019 Bolt, 2020 Taycan Turbo…never more than 3 or 4 at once but I've owned a few EV's - and put over 350,000 miles on them in a family of 5 with 4 drivers using them for road trips and daily driving duty. I believe all EV's have pros and cons, but on the whole EV's from any manufacturer (done right) offer a compelling alternative to run of the mill gasoline cars that infest our road ways…
As one transitions to EV's you quickly become acclimated to the benefits of an EV and find yourself not willing to go back, once you own one EV, you're going to own another, and that raises the specter of EV charging at home for multiple EV's. If you think planning charging for one EV is tricky, charging 3 or 4 EV's over night with appropriate equipment and electrical capacity easily exceeds the typical capacities for residential electrical loads…
EV charging is best done overnight, at home and rarely using public charging. If you have an EV with 150 miles or more of range this will easily cover 99.9% of most people's daily driving and transitioning to an EV will be relatively painless at first, and advantageous over time as you grow more acclimated to your new EV overlords
The typical driving day is 70 miles or less for 98% of daily vehicle usage. This is easily handled by a home charging configuration and requires about 20 kWh of power overnight. With your typical 40 amp charger (50 amp breaker) this translates to to approximately 2 1/2 hours of overnight charging time…easy, no problem, this is a typical EV garage setup and will serve you well and you will enjoy your EV immensely.
However once you add a 2nd EV (for the wife - cause she loves charging at home and hates the gas station), and then with young adult drivers the Bolt is a great car, and it has all the EV advantages at a lower price point than Tesla, Audi, Porsche, VW - you can easily find yourself with 3 or 4 EV's to charge over night - each requiring 10-20 kWh. And the most direct install would be 4 separate EV chargers - one for each car, but then that's a 50 amp breaker for each EV charger (if you want to charge all 4 cars at once), and that's 200 amps just for the garage!! 200 amps is more than most residential service and is impractical for a multi EV install for 98% of residential situations.
An alternative is to go slower on the charge rate - say 4 12 amp EV chargers, which is one 60 amp breaker (48 amps / 4 = 12 amps) but that penalizes the EV charging when only one or two cars need to charge by slowing down their charge rate to 12 amps even when only one EV is charging.
A potentially better solution is to install multiple EV chargers, but have them share a single breaker. And have those chargers dynamically adjust the load based on how many EV's are actually plugged in, and charging at any given time. This has the advantage of charging one EV as fast as possible, but splitting the available load when multiple EV's are charging at the same time.
Fortunately for the EV community the J-1772 standard for North America was fairly forward looking in this regards and load sharing is a supported feature of the J-1772 standard - which is really really cool for a multi EV household. That means if you can find an EVSE that supports this feature of J-1772 - you only have to install one circuit for your garage (as big as you can handle or pay for) and you can link/share/master/slave multiple EVSE's to "share" that circuit - such that they will split the load while charging multiple EV's, but make the entire available AC-current capacity available when there is only a single EV charging.
There are four EVSE's that I know that support this advanced black-belt EV enthusiast feature (there may be more):
- ClipperCreek - 60 amp Share2 is one example - click here.
- JuiceBox
- Tesla Wall Charger Gen2
- Tesla Wall Charger Gen3
My setup at home is 4 Tesla Wall Chargers Gen2 - One Master, 3 slaves sharing a 100 amp circuit - this allows a maximum charge rate of 80 amps (19.2 kW), and when 4 EV's are charging at once it nicely splits the load such that each EV get's 20 amps (80 / 4) - 4.8 kW for each car.
I've had this setup of a number of years and it's worked well for charging 1-4 EV's all at once - and dynamically adjust the load based the actual draw it see's in use. It also helps optimize charging for EV's with different maximum charge rates - and doesn't "lock you in" to any fixed charge rate purely to allow "sharing". The charge rates of cars I've owned are listed below:
- Ford Focus EV - 30 amps - 7.2 kW
- Nissan Leaf - 16 amps - 3.6 kW
- Model S P85 - 80 amps - 19.2 kW
- Model S P85D - 80 amps - 19.2 kW
- Model X P90D - 80 amps - 19.2 kW
- Model X P100D - 72 amps - 17.28 kW
- Chevy Bolt - 32 amps - 7.68 kW
- Model 3 Performance - 48 amps - 11.2 kW
- 2020 Taycan Turbo - 40 amps - 9.6 kW (documented)
- 2020 Taycan Turbo - 48 amps - observed behavior in the wild (undocumented)
- Chevy Volt - 16 amps - 3.6 kW
for example if you have a Leaf and Model X charging - the leaf can charge at it's full 16 amps, and the Model X will charge at 64 amps- if the leaf finishes charging first - it's load will drop - EVSE will then adjust the maximum rate for the remaining EV (the Model X) and it will get it's full 72 amp capacity to finish it's charging session.
when charging the Model 3P and the Model X and a Bolt - we have 80 amps / 3 - I've observed each car getting 24 amps - until one car "drops" off or taper's it's charge - and then the remaining capacity gets split for the two remaining cars that are still charging.
the Good news here is that this isn't very expensive, it's in fact not that bad - in that Tesla Wall Chargers are only $500 each - so you can have a 2 or 3 charger setup in your home sharing a single circuit for less than the cost of the Porsche Mobile Charger Connect and have a great home multi-EV charging setup.
My setup works great and all my families EV's can be plugged in and charge with impunity and the EV always get the maximum rate available which optimizes my charging time and does not limit the charge rate unless there are multiple EV charging at the same time.
What did I test?
- 2017 Tesla Model X - 72 amp
- 2019 Bolt - 32 amp + JDApter and TeslaTap
- 2014 Volt - 16 amp + JDApter and TeslaTap
- 2020 Taycan - 48 amp + JDApter and TeslaTap
- 4 Tesla Wall Chargers configured as Master/Slave/Slave/Slave sharing a 100 amp circuit - 80 amp maximum capacity for EVSE charging
2nd Test - Plug in the Bolt - confirmed 32 amp charge rate - 7.68 kW
3rd Test - Plug in the 2020 Taycan Turbo - confirmed 10.86 kW charge rate (48 amps)
4th Test - Tesla & Taycan - both got 40 amps
5th Test - TEsla & Taycan charging - unplug the Taycan - 5 min later the Tesla was at full 72 amps
6th Test - Tesla charging at full 72 amps - plug in the Taycan - both cars drop to 40 amps
7th Test - TEsla & Taycan charging at 40 amps each - unplug the Tesla - Taycan ramps up to 48 amps
8th Test - Tesla Charging at 72 amps, plug in Taycan - now both cars are charging at 40 amps - add in the Bolt - each car gets approximately 24 amps
9th Test - 3 cars charging - 24 amps each - Tesla, Taycan, Bolt - unplug the Tesla - Bolt gets 32 amps, Taycan gets 48 amps
10th Test - 4 cars charging - Tesla, Bolt, Taycan, Volt - Volt gets 16 amps, each of the other 3 cars each seem to get 20 amps
11th Test - during test #10 - unplug the Tesla & the Bolt - now the Volt is getting 16 amps, and the Taycan is getting 48 amps
In all cases I tried the Taycan will adjust it's charge rate dynamically with in 5 to 10 minutes and adjust it's charging rate to match the dynamic load currently being managed by the 4 Tesla Wall Chargers - it's the responsibility of the Wall Chargers to coordinate their usage to not exceed the maximum 80 amp total capacity while any number of EV's are charging - and in four years of charging I've never had a breaker trip or seen any consumption usage that exceed the 19.2 kW maximum capacity of my charging circuit.
If you are looking for a future proof advanced home charging setup - I seriously recommend you consider a high quality shared load EVSE setup which will allow you to use your full charging capacity at all times, and also seamless adjust the load dynamically when there are multiple EV's charging at once. It makes owning multiple EV's really really painless and lets each EV maximize it's charge session with out any manual adjustments.
I'm personally very happy with my setup and very gratified that the Taycan seems to play nicely in this setup and responds well to changes in the charging capacity during a charging session.
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