Is The 22Kw On-Board Charger Really That Bad?

[tigerbalm]

Had it replaced four times on my 2021 Taycan. My 2023 Taycan still had the factory 22kW OBC in it when I traded it in and was regularly used at 22kW.

Porsche rolled out a software fix for the original 22kW ONC in late 2022 which went a long way to making them more reliable.

But it is obvious from this forum that they continue to be more unreliable than the standard 11kW charger and the fact that 22kW was promised for the facelift Taycan has not yet appeared is definitely "interesting".

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[Spyerx]

the one in my 22 lasted 20k miles 3 1/4 years before it failed.

 

[whitex]

yes it's bad - and yes it has a high failure rate- but it's only bad if you commonly use it's at it's worst when you commonly/routinely use it's 22 kW/19.2 kW capacity - having a 22 kW OBC on a Taycan but routinely using it at less than 22 kW should greatly extend it's life

Not sure the above is true. The one known (published by Porsche) failure mode in EU was using the 22kW onboard charger on a single phase 7.3kW. There used to be an advisory for 22kW OBC to only charge at 6kW when using single phase (but no way to limit it from the car side of course).

 

[allroadusa]

I did that for 2 years: 6kW max set at the wall charger… but I failed though…

 

[whitex]

I did that for 2 years: 6kW max set at the wall charger… but I failed though…

My (NA version) died in just under 2 years charging at 19.2kW.

 

[tigerbalm]

Not sure the above is true. The one known (published by Porsche) failure mode in EU was using the 22kW onboard charger on a single phase 7.3kW. There used to be an advisory for 22kW OBC to only charge at 6kW when using single phase (but no way to limit it from the car side of course).

Correct and the issues were more frequent in UK and Ireland where single phase electricity supply is more common than the three phase used in much of mainland Europe.

While I charged my original (and problematic) Taycan 4S on single phase 7kWh – it was interesting to me that *each* time that it did fail, it was when it was on a 22 kW three-phase public charger.

This issue with single phase (some sort of resonance issue if I remember correctly) was software fixed as part of the large original Taycan software update that introduced the new PCM version (colourful buttons one).

 

[PDAZ]

My car had 12500km and it blew up while charging at home at 10.5kW.

My 22kw charger blew up after2.5 yrs and was replaced for free. My 270 kw charger i complaint on only 120kw charging often, it has an error so this 270 was replaced and now it chatger my 2023ct4s much faster

up to 268 kw even at 52%, really a clear improvement

 

[ghostdriver]

22kw died at 3 years, only ever charged using 7kw home charger. Replaced with 11kw, awaiting agreed compensation to be paid

 

[PDAZ]

I have 2021 taycan4s with standard 22kw on board charger. There were a lot of problems at the beginning. Porsche replaced my on board charger 3 times due to failure during charging. The vehicle was towed 2 times. The last version is very good and I don't have any problem with this charger for the last 20k km.

This Sounds the latest 22kw charger s are better Versions hopefully, my 22kw works well. My Porsche Dealer told my zu Here are No 22kw at Porsche more in Stock, next time every 22kw will be with 11kw chargers replaced will is Not ok. I paid as extra für 22kw charger, hast this happened to someone slresdy??

 

[whitex]

This Sounds the latest 22kw charger s are better Versions hopefully, my 22kw works well. My Porsche Dealer told my zu Here are No 22kw at Porsche more in Stock, next time every 22kw will be with 11kw chargers replaced will is Not ok. I paid as extra für 22kw charger, hast this happened to someone slresdy??

A few threads on this. Search is your friend. Here is one:
https://www.taycanforum.com/forum/threads/22kw-charger-is-now-nla.29306/

 

[B61]

yes it's bad - and yes it has a high failure rate- but it's only bad if you commonly use it's at it's worst when you commonly/routinely use it's 22 kW/19.2 kW capacity - having a 22 kW OBC on a Taycan but routinely using it at less than 22 kW should greatly extend it's life…but you don't always control the charge rate when you plug into a public EV charger…

My experience was different.
During first year, i was charging only at 22kw (at work).
When i retired, i have 11kw only at home…another year, no problems.
In my 3rd year, still no DC charging, problems started; they replaced obc twice.
In my 4th year, i started to use Ionity a lot… got yellow errors several times, till red one occured,, but obc didn’t fail at all…. So my ex CT4 still has 22kw

 

[ze_shark]

This Sounds the latest 22kw charger s are better Versions hopefully, my 22kw works well. My Porsche Dealer told my zu Here are No 22kw at Porsche more in Stock, next time every 22kw will be with 11kw chargers replaced will is Not ok. I paid as extra für 22kw charger, hast this happened to someone slresdy??

There is no evidence that Porsche's supplier ever changed the STM MOSFETs which appear to be behind this widely established pattern of failures.

The question thus comes down to whether OP can tolerate the financial and practical risk of a failure, because the probability of it is very significant. You'd have to be peak "did not happen to me thus does not exist" millenial to conclude otherwise.

 

[daveo4EV]

I've been reading aroudn the forums and reddit and almost everyone says the 22Kw on-board charger is really bad and theres a 90% chance it will fail within the first year. How true is this?

I am looking for a CPO with 22kW onboard charger because in my country we mostly have 22Kw chargers around cities and malls (11kw at home). Considering the Gen 1 taycans range is low, i think 22kw would be a lifesaver for me.

How bad is it, and is the 11Kw charger really more reliable than the 22kw one??

https://www.taycanforum.com/forum/threads/no-22kw-charging-ports.31552/page-2#post-482843
https://www.taycanforum.com/forum/threads/22kw-charger-is-now-nla.29306/page-6#post-489802

in fact there are so many problems and known issue that Porsche itself has admitted the 22 kW OBC has issues via an extended warranty (Porsche doesn't do this on components that work well)

https://www.taycanforum.com/forum/t...y-extension-19-2-kw-in-us-july-11-2025.28844/

so - yeah - straight from the Horses mouth - Porsche is telliing it this is a problematic component.

let’s just say if you don’t have problems even Porsche will be surprised.

 

[JaseH84]

22kw died at 3 years, only ever charged using 7kw home charger. Replaced with 11kw, awaiting agreed compensation to be paid

Did they pay out? Mine has just failed, same thing only ever 7kW charging, so I’ll likely be looking at the same remedy.

 

[ghostdriver]

yes paid out, took a while tbf, had to chase a couple of times.

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