Installing a home DC charger

[Grim]

I’m in the process of building a new house and have been considering options for charging.

I will have a 3 phase supply able to cater for 2x 22kwh AC chargers but was also exploring the option of 20kwh DC charger as both of my cars can only accommodate 11kwh AC …

Has anyone installed a home DC charger like one below?

https://www.projectev.co.uk/wp-content/uploads/2023/05/EVD-20S-P-Datasheet-V1.4-C.pdf

Presumably 20kwh wouldn’t be considered fast enough to degrade the battery more quickly than standard charging?

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[Jhenson29]

I looked into single phase DC chargers, in the US, but they were very expensive (around $10k).

I wouldn’t expect any additional degradation using low power DC.

Many people use AC charging at around that power. I always charge at 18kW at home.

 

[McgR]

I’m in the process of building a new house and have been considering options for charging.

I will have a 3 phase supply able to cater for 2x 22kwh AC chargers but was also exploring the option of 20kwh DC charger as both of my cars can only accommodate 11kwh AC …

Has anyone installed a home DC charger like one below?

https://www.projectev.co.uk/wp-content/uploads/2023/05/EVD-20S-P-Datasheet-V1.4-C.pdf

Presumably 20kwh wouldn’t be considered fast enough to degrade the battery more quickly than standard charging?

Your current cars can accommodate 11 kw but your future ones will maybe have 22kw. To be future proof go for the 22 kw ones and for now 11 kw is enough to charge over night.

 

[Scandinavian]

There should not be any difference at all charging with 20 kW DC or AC for battery impact. Would be interesting to see which rectifier is the most efficient, built in or external one?

 

[daveo4EV]

as noted I've found none that are affordable - and my home would be limited to about 20 kW anyways - which is no faster than 100/80 amp 240V L2 AC charger

the main problem with DC residential charging is there is:

• no schedule support for DC charging w/Taycan
• no max battery SOC % support for DC charging w/Taycan
• most other EV's are similar - but they may support SOC% but not scheduling
• you'd need a CCS adatper to charge a Tesla - if a friend/familiy/neighbor with a Tesla needed to charge they have a J-1772 adapter but may not have purchased the CCS1 adapter.

so every time you plugged in it would start charging immediately (most like peak rates for my personally) and would charge to 100% SOC which is hard on the battery's longevity.

a good 100/80 AM AC charger is plenty fast (no slower than most residential DC chargers could offer for 99% of residential homes) and you can option the 19.2 kW charging option for Taycan in North America or 22 kW charging option in ROW…and it's cheaper than any FastDC charger I've found.

money would be better spent putting in a 100 amp circuit (80 amp charging capacity) and then installing two universal Tesla Wall chargers (each 60/48 amp 11 kW capable) and configuring them to "power share" the 100/80 amp circuit.

my $0.02

 

[Grim]

Thanks all.

The 20kw DC charger is about £5k so probably around 3x the cost of an 22kw AC ones - expensive but not prohibitively so if it can then be used on any car.

I didn’t like the idea of optioning 22kw inverter on the Taycan as it’s expensive option and given my car is on a lease you get nothing back on residuals the way the leases are priced.

I suspect that going forward 22kw inverters will remain optional on most cars given the additional cost (and presumably weight) involved and the fact that most people charging at home will be limited to 7kw anyway due to single phase connections.

Interesting consideration re scheduling and limiting the SOC. I do wonder if DC chargers generally have to be smarter (with two way communication) and the limit could be set on the charger itself?

The gadget lover in me wants to go the DC route but my head thinks 22kw AC should be plenty even if limited to 11kw.

Presumably the Tesla connector issue only affects the US with CCS being ubiquitous in Europe?

 

[McgR]

Thanks all.

The 20kw DC charger is about £5k so probably around 3x the cost of an 22kw AC ones - expensive but not prohibitively so if it can then be used on any car.

I didn’t like the idea of optioning 22kw inverter on the Taycan as it’s expensive option and given my car is on a lease you get nothing back on residuals the way the leases are priced.

I suspect that going forward 22kw inverters will remain optional on most cars given the additional cost (and presumably weight) involved and the fact that most people charging at home will be limited to 7kw anyway due to single phase connections.

Interesting consideration re scheduling and limiting the SOC. I do wonder if DC chargers generally have to be smarter (with two way communication) and the limit could be set on the charger itself?

The gadget lover in me wants to go the DC route but my head thinks 22kw AC should be plenty even if limited to 11kw.

Presumably the Tesla connector issue only affects the US with CCS being ubiquitous in Europe?

Yes because Tesla has a different one in Europe.

 

[whitex]

as noted I've found none that are affordable - and my home would be limited to about 20 kW anyways - which is no faster than 100/80 amp 240V L2 AC charger

the main problem with DC residential charging is there is:

• no schedule support for DC charging w/Taycan
• no max battery SOC % support for DC charging w/Taycan
• most other EV's are similar - but they may support SOC% but not scheduling
• you'd need a CCS adatper to charge a Tesla - if a friend/familiy/neighbor with a Tesla needed to charge they have a J-1772 adapter but may not have purchased the CCS1 adapter.

so every time you plugged in it would start charging immediately (most like peak rates for my personally) and would charge to 100% SOC which is hard on the battery's longevity.

a good 100/80 AM AC charger is plenty fast (no slower than most residential DC chargers could offer for 99% of residential homes) and you can option the 19.2 kW charging option for Taycan in North America or 22 kW charging option in ROW…and it's cheaper than any FastDC charger I've found.

money would be better spent putting in a 100 amp circuit (80 amp charging capacity) and then installing two universal Tesla Wall chargers (each 60/48 amp 11 kW capable) and configuring them to "power share" the 100/80 amp circuit.

my $0.02

IIRC the residential DC charger that Ford was selling does support max SoC target (the charger can read SoC via CCS protocol). I would think scheduled charging should be supported too, but haven't seen it. It also supports powering your home from the car battery (down to some settable SoC), but Taycans do not enable that.

 

[W1NGE]

Thanks all.

The 20kw DC charger is about £5k so probably around 3x the cost of an 22kw AC ones - expensive but not prohibitively so if it can then be used on any car.

I didn’t like the idea of optioning 22kw inverter on the Taycan as it’s expensive option and given my car is on a lease you get nothing back on residuals the way the leases are priced.

I suspect that going forward 22kw inverters will remain optional on most cars given the additional cost (and presumably weight) involved and the fact that most people charging at home will be limited to 7kw anyway due to single phase connections.

Interesting consideration re scheduling and limiting the SOC. I do wonder if DC chargers generally have to be smarter (with two way communication) and the limit could be set on the charger itself?

The gadget lover in me wants to go the DC route but my head thinks 22kw AC should be plenty even if limited to 11kw.

Presumably the Tesla connector issue only affects the US with CCS being ubiquitous in Europe?

In terms of battery degradation I doubt there will be any difference as the power output is too low.

In terms of programming a charging session does the DC EVSE not provide its own control mechanism?

Personally, I'd opt for 22kW AC (11 kW or even 7.4kW is more than enough for home based oernight charging) which provides some future proofing.

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