DC Charging at Home

[DSHTaycan]

I have a 2021 Taycan and have been AC charging at home for 3 years. Recently got my wife a 2025 Audi Q6 Etron. With 2 EVs in the garage, I began searching for a way to charge faster at home. Most DC fast charger require 480v 3 phase power to function which can be quite expensive to install in a home residence. I found a great solution from Primecom.Tech who offer a DC charger that can run from 220v single phase AC input power. It is a 22kwh or 28kwh charger and can charge up to 800v DC. So i ordered the 22kwh version. Received the unit and installed it in my garage. Required a seperate 100amp 220v circuit. Since i am an EE, i installed the circuit myself, mounted the charger on the wall and turned on the breakers. Up came the charger and ready for use. Plugged in the Q6 and charging began. Charger display showed DC voltage at 670v at 50amps. I was getting 1 mile of charge every 40 seconds, so after 1 hour of charging, i got over 75 miles of charge which is 5x what my AC charger would do. Full charge from 10% to 80% in alittle over 2 hours. Unit was expensive but in my opinion well worth it if you want DC faster charging at home. Primecom. Tech customer service is Outstanding. Call David and he will tell you all about this charger.

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[daveo4EV]

this effectively makes all EV's a 22 kW fast charging EV because it bypasses the limits of the onboard AC charger…

the _ONLY_ reason I don't have one of these (other than the cost) is DC charging bypasses/disables all the onboard timers/profiles - so if you're on a TOU electrical pricing system I'm unaware of any mechanism to schedule your charging to take place between midnight and 7 am for example…

has Porsche "fixed" their charge scheduling in J1.2 to have scheduled charging support?

and can you limit DC charging to 80% for daily use via Porsche's vehicle profiles/timers?

this is a great work around for the lack of a 22 kW OBC option from Porsche (or for that matter any EV) - I wanted one of these for my ChevyBolt with it's anemic 7.68 kW AC OBC, but support for 50 kW via CCS1…

I like the product - but most EV auto manufactures don't allow fast charging to be a daily/scheduled thing…for plug in when you get home and have it "wait" until electrical rates are cheaper before you start charging.

great solution if you don't want TOU scheduled charging, but maybe the unit itself supports this.

 

[Flying ace]

Do you have a picture of this? This is a good solution to the defective 19.2/22kw AC charger option

The other possible higher power 48kw DCFC you can install is this Autel version, but needs a higher voltage permit for
commercial.

 

[WalterG]

I have a 2021 Taycan and have been AC charging at home for 3 years. Recently got my wife a 2025 Audi Q6 Etron. With 2 EVs in the garage, I began searching for a way to charge faster at home. Most DC fast charger require 480v 3 phase power to function which can be quite expensive to install in a home residence. I found a great solution from Primecom.Tech who offer a DC charger that can run from 220v single phase AC input power. It is a 22kwh or 28kwh charger and can charge up to 800v DC. So i ordered the 22kwh version. Received the unit and installed it in my garage. Required a seperate 100amp 220v circuit. Since i am an EE, i installed the circuit myself, mounted the charger on the wall and turned on the breakers. Up came the charger and ready for use. Plugged in the Q6 and charging began. Charger display showed DC voltage at 670v at 50amps. I was getting 1 mile of charge every 40 seconds, so after 1 hour of charging, i got over 75 miles of charge which is 5x what my AC charger would do. Full charge from 10% to 80% in alittle over 2 hours. Unit was expensive but in my opinion well worth it if you want DC faster charging at home. Primecom. Tech customer service is Outstanding. Call David and he will tell you all about this charger.

That’s really cool! Thanks for sharing. There’s really nothing else like it that I’ve seen that delivers 75 miles per hour from a home charger.

 

[daveo4EV]

That’s really cool! Thanks for sharing. There’s really nothing else like it that I’ve seen that delivers 75 miles per hour from a home charger.

_ANY_ 20 kW EVSE will delivery 75 miles of charge per hour _IF_ the vehicle has the 22/19.2 kW on board charger…but most EV's do not offer an 20 kW OBC factory option anymore…so you're limited to about 7 - 11 kW max AC charging speeds for most EV's

here are two AC EVSE's that will do 75 miles per hour of charge (if your EV will allow it):

https://shop.porsche.com/us/en-US/p/porsche-wall-charger-connect-9J1068209-B/9J1068209
https://enphase.com/store/ev-chargers/ev-chargers-business/enphase-CS-100-EV-charger

both of these North American EVSE's can be installed on a 240v/100 amp circuit (just like this FastDC unit) - and if plugged into an EV w/19.2 kW onboard charger will charge at 75 miles-range/hour…

the "secret sauce" of a FastDC charger is that it bypasses the onboard AC/OBC "limits" and will charge most any EV at ~20 kW (which is 75 miles-range/hour) - so you no longer need an EV that supports 20 kW AC power - and most (99.9%) EV's can charge at 20 kW via FastDC charging…in fact most EV's that support fastDc charging support much much more than 20 kW - 50 kW is kinda minimum and most are 100 kW or more (Macan EV is 290 kW, and J1.2 Taycan is 330 kW) - so 20 kW fastDC charging is considered "slow" by most FastDC charging standards/expectations - I unplug from an EA charger when it drops to 20 kW or less cause by that point you're almost full on your battery - ROFL

beware - installing this type of Charger will _NOT_ be able to charge your Cayenne Hybrid - the Cayenne/Panamera/Prius etc… do not support FastDC - so this home charger will not charge them…you'll need a traditional AC 240V/120V charger for your Hybrid in addition to this fancy FastDC unit…

NOTE: what would impress me even more is if this unit with the NACS plug option supported both AC and DC charging - one of the nifty things about NACS is it is both an AC plug type, and a DC plug type - and the EV/EVSE can negotiate either an AC charging session or DC charging session - in theory a home unit like this plugged into the home's AC power, should be able to offer both AC charging and DC charging conditionally - and then this unit could support charging Hybrid's/EV that lack FastDC support - it would even be acceptible if it was just a "switch/button" on the EVSE unit itself - I park, I select AC or FastDC on the unit - I plug into the NACS cable - now I can charge via AC _OR_ FastDC depending on my EV's requirements…

also when using this unit in "AC" mode it would support scheduled charging and SOC limits since the EV/Vehicle would simply see this as a normal AC charging session and apply it's scheudle/SOC limits.

but at the end of the day 20 kW is 20 kW regardless of if it's AC or DC - and 20 kW's of charging is about 75 miles-range/hour of charging…

again the nifty trick of this is since it's FastDC you are no longer limited by your EV's OBC AC/DC conversion limits…so it allows your EV to charge as fast as your electrical circuits capacity.

Pros:

• 20 kW fast charging for any/all FastDC charging based EV's - big win
  • bypasses the EV's OBC limits and uses most EV's native support for FastDC charging
  • ~70-90 miles-range/hour for most any EV
• supports NACS or CCS1 plug styles shouldn't matter which one
• 70 miles-range/hour of charge
• very very high cool factor
• fastest possible nominal charge rate for North American residential installation
• 99.9% of North American EV's will support charging at 20 kW's when using this unit - regardless of factory options

Cons:

• requires a 100 amp 240V circuit - many residential homes can not support this
  • but to be fair _ANY_ EVSE that supports 20 kW's requires this
• many EV's offer limited/no support for charge schedulingif you're using FastDC charging
  • limited/no support for TOU charging (wait until midnight to start charging)
• many EV's offer limited/no support for SOC limitswhile FastDC charging - so if you don't attend to the charging session you'll be charging to 100% SOC every time you plug in
  • this will greatly impact your batteries longevity charging to 100% SOC every day
  • NOTE: it's not the charge rate affecting battery longevity (20 kW is no big deal for longevity impacts) - it would be the daily charging to 100% SOC - charging LiON cells to max power and leaving them sitting idle at max power is very very hard on the batteries longevity…
• does not support charging non-FastDC charging EV's (namely plug-in hybrids) or EV's with out fastCharging support (some Bolts for example FastDC charging was a factory option so they can't charge via this charger if they lack the factory option)
• unclear if this will support Tesla's MY'2016 that do not support CCS1 based charging
  • it most likley only supports Tesla that also support CCS1 - MY'2016 or later I believe
• cost: $7,000 for an EVSE is quite steep…
  • 20 kW FastDC Unit - $7000+$2000 100 amp AC circuit = $9000 cost for this in your home
  • 20 kW AC PorscheWall charger - $1500 + $2000 100 amp AC circuit = $3500 cost for this in your home
  • so from an install cost point of view this unit is almost 3x the cost of an equivalent 20 kW non-FastDC unit…

at the end of the day this is a 20 kW EVSE - 20 kW EVSE's will delivery 75 miles of range to any car they are charging - but this 20 kW EVSE's will charge _MOST_/_MANY_/_ALL_ EV's at 20 kW's so you're no longer limited by your EV's AC Onboard-Charger (OBC) capacity - nifty…

 

[DSHTaycan]

this effectively makes all EV's a 22 kW fast charging EV because it bypasses the limits of the onboard AC charger…

the _ONLY_ reason I don't have one of these (other than the cost) is DC charging bypasses/disables all the onboard timers/profiles - so if you're on a TOU electrical pricing system I'm unaware of any mechanism to schedule your charging to take place between midnight and 7 am for example…

has Porsche "fixed" their charge scheduling in J1.2 to have scheduled charging support?

and can you limit DC charging to 80% for daily use via Porsche's vehicle profiles/timers?

this is a great work around for the lack of a 22 kW OBC option from Porsche (or for that matter any EV) - I wanted one of these for my ChevyBolt with it's anemic 7.68 kW AC OBC, but support for 50 kW via CCS1…

I like the product - but most EV auto manufactures don't allow fast charging to be a daily/scheduled thing…for plug in when you get home and have it "wait" until electrical rates are cheaper before you start charging.

great solution if you don't want TOU scheduled charging, but maybe the unit itself supports this.

The key for me was i did not have 480 3 phase in my garage. Was easy to install on 220v 100 amp service. I belive the Taycan allows TOU scheduling and 80% SOC.

 

[BeeEmm]

I thought that DC fast charging was only recommended to be done occasionally and slower charging on a regular basis was kinder to battery life. Am I wrong?

 

[daveo4EV]

I thought that DC fast charging was only recommended to be done occasionally and slower charging on a regular basis was kinder to battery life. Am I wrong?

you're not wrong but 20 kW is not "fast" charging from the perspective of the the battey - 200 kw and higher is "fast" charging…

it's not the "DC" charging that "wears" the battery - it's stuffing 200-340 kW of power into the LiON cells that causes the "pressure" and wears them more aggresively…

20 kW is a "light spring rain" and no different in wear/tear than AC charging…

 

[daveo4EV]

The key for me was i did not have 480 3 phase in my garage. Was easy to install on 220v 100 amp service. I belive the Taycan allows TOU scheduling and 80% SOC.

My Macan EV allows the following with FastDC charging

• Set SOC%

but does not allow "scheduling" - so it's no good for my midnight to 7 am charging window.

 

[DSHTaycan]

Do you have a picture of this? This is a good solution to the defective 19.2/22kw AC charger option

The other possible higher power 48kw DCFC you can install is this Autel version, but needs a higher voltage permit for
commercial.

Here is a pic of my installation.

 

[Flying ace]

you're not wrong but 20 kW is not "fast" charging from the perspective of the the battey - 200 kw and higher is "fast" charging…

it's not the "DC" charging that "wears" the battery - it's stuffing 200-340 kW of power into the LiON cells that causes the "pressure" and wears them more aggresively…

20 kW is a "light spring rain" and no different in wear/tear than AC charging…

So using Electrify America is just fine then ?

 

[WalterG]

The owners manual says that charging regularly with DC under 50kw is fine.

 

[meygoren]

I have a 2021 Taycan and have been AC charging at home for 3 years. Recently got my wife a 2025 Audi Q6 Etron. With 2 EVs in the garage, I began searching for a way to charge faster at home. Most DC fast charger require 480v 3 phase power to function which can be quite expensive to install in a home residence. I found a great solution from Primecom.Tech who offer a DC charger that can run from 220v single phase AC input power. It is a 22kwh or 28kwh charger and can charge up to 800v DC. So i ordered the 22kwh version. Received the unit and installed it in my garage. Required a seperate 100amp 220v circuit. Since i am an EE, i installed the circuit myself, mounted the charger on the wall and turned on the breakers. Up came the charger and ready for use. Plugged in the Q6 and charging began. Charger display showed DC voltage at 670v at 50amps. I was getting 1 mile of charge every 40 seconds, so after 1 hour of charging, i got over 75 miles of charge which is 5x what my AC charger would do. Full charge from 10% to 80% in alittle over 2 hours. Unit was expensive but in my opinion well worth it if you want DC faster charging at home. Primecom. Tech customer service is Outstanding. Call David and he will tell you all about this charger.

Hey Don! I appreciate the kind words, David is definitely very helpful and Im glad your getting some great speeds from your charger. If you ever need any help please reach out and Id be glad to help!

 

[d00d]

Thanks for letting us know about Primecom.

I was looking into home DC charging for when/if the Cayman EV arrives, as I live in the same town as the track, and wouldn't have time between sessions to drive to a public one.

Found Charge Qube, leisurely charge up the Tesla batteries with AC, then fast discharge DC.

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