CT Supercharging speeds on V4 SC

[Gyzz]

Hi

Has anybody experienced the CT charging speeds on the Tesla SC V4 chargers ???

as I recall the various geeks on the internet have insinuated to the CT battery being two 400V in connection thus being able to utilize 800V charging which should be supported by the V4 chargers (I dont know if the SW support this yet) but have anybody experienced different charging speeds from the V4 SC ??

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[mongo]

Hi

Has anybody experienced the CT charging speeds on the Tesla SC V4 chargers ???

as I recall the various geeks on the internet have insinuated to the CT battery being two 400V in connection thus being able to utilize 800V charging which should be supported by the V4 chargers (I dont know if the SW support this yet) but have anybody experienced different charging speeds from the V4 SC ??

800V only helps if cable connection is current limited.
V4 posts are connected to V3 style cabinets with the old current and voltage limits, but Tesla has started testing a few sites with higher current and power.

 

[Woodrick]

Hi

Has anybody experienced the CT charging speeds on the Tesla SC V4 chargers ???

as I recall the various geeks on the internet have insinuated to the CT battery being two 400V in connection thus being able to utilize 800V charging which should be supported by the V4 chargers (I dont know if the SW support this yet) but have anybody experienced different charging speeds from the V4 SC ??

From a charging perspective, there is NO difference between a V3 and V4 at this time. They are both 400V 250kW chargers.
The V4, I believe has credit card proximity readers and CCS plug support, but only 250kW charging.

There are some V3 pedestals that have raised the 250kW cap and are testing 320kW charging at 400V.

No Tesla supported 800V charging as far as I know.

 

[SSonnentag]

800V only helps if cable connection is current limited.

Or if the battery pack is current limited, which it likely is, at least during the hot months here in the desert. 800V charging would allow cutting the current in half while maintaining the same charge rate. Or potentially cutting the charge time in half while maintaining the same current observed on a 400V charger.

 

[mongo]

From a charging perspective, there is NO difference between a V3 and V4 at this time. They are both 400V 250kW chargers.
The V4, I believe has credit card proximity readers and CCS plug support, but only 250kW charging.

There are some V3 pedestals that have raised the 250kW cap and are testing 320kW charging at 400V.

No Tesla supported 800V charging as far as I know.

The 320kW uses V4 posts. Those only have card readers where required for Federal funding.

 

[mikeg112]

Is there a way to visually confirm if the cabinet is 320kW compatible, such as viewing the nameplate plaque at the charging cabinet?

 

[mongo]

Or if the battery pack is current limited, which it likely is, at least during the hot months here in the desert. 800V charging would allow cutting the current in half while maintaining the same charge rate.

Only if the limitation is from the charge port to the DPDT parallel/series switch. After that, the current seen by battery module wiring is solely dependent on charge rate kW.
Module current = charge power / 200V / 4 .

 

[mongo]

Is there a way to visually confirm if the cabinet is 320kW compatible, such as viewing the nameplate plaque at the charging cabinet?

Not at the moment, it's only a test set of posts. Once they prove it out, the navigation site list will get updated along with (one hopes) the ratings plates.

 

[SSonnentag]

Only if the limitation is from the charge port to the DPDT parallel/series switch. After that, the current seen by battery module wiring is solely dependent on charge rate kW.
Module current = charge power / 200V / 4 .

So the truck has a voltage doubler built-in? I thought the two halves of the pack disconnected and charged as two separate 400V packs. Maybe I'm confusing this with a different EV pickup....

 

[mongo]

So the truck has a voltage doubler built-in? I thought the two halves of the pack disconnected and charged as two separate 400V packs. Maybe I'm confusing this with a different EV pickup....

They do, but both halves charge simultaneously so the current per module is the same either way.

800V: 100A running through one series string of 4 modules
400V: 200A running as 100A in each of two parallel strings of 2 modules
Either way there is 100A going through the individual modules

 

[Woodrick]

Is there a way to visually confirm if the cabinet is 320kW compatible, such as viewing the nameplate plaque at the charging cabinet?

Nope, in beta.

 

[Woodrick]

So the truck has a voltage doubler built-in? I thought the two halves of the pack disconnected and charged as two separate 400V packs. Maybe I'm confusing this with a different EV pickup....

No voltage doubler, they just connect the two sides in series for 800V, parallel for 400V. Simple high current relays.

 

[SSonnentag]

They do, but both halves charge simultaneously so the current per module is the same either way.

800V: 100A running through one series string of 4 modules
400V: 200A running as 100A in each of two parallel strings of 2 modules
Either way there is 100A going through the individual modules

Cool, thanks for the explanation.

 

[Crissa]

Tesla hasn't yet rolled out much complete v4 Hardware/Software, so we don't really know. We do know some v3 backends are using v4 cabinets and vice-versa, but that's all limited to 400v systems.

Tesla has said v4 will have 800v, but it's hard to know if they've deployed any of it. Rumors, but nothing I can link to.

The 400v charging is limited at the cable... We don't really know what the eventual limit of the 800v charging will be on the Foundation Series.

-Crissa

 

[FlykidCT]

Hi

Has anybody experienced the CT charging speeds on the Tesla SC V4 chargers ???

as I recall the various geeks on the internet have insinuated to the CT battery being two 400V in connection thus being able to utilize 800V charging which should be supported by the V4 chargers (I dont know if the SW support this yet) but have anybody experienced different charging speeds from the V4 SC ??

There aren’t any V4 chargers yet. They are “3.5” out there . V4 dispensers and V3 cabinets. I understand Somme open 3.5s can do 400v at 700 a for longer because of the cooled cable but that’s it.

I’ve used the CCS1 to NACS adapter at a 350kW EVgo and Electrify America and it does do 800v at 400a (roughly) and can do 350Kw.. slows down to 330 until about 32% I think then settles down at 250kW for a good while. I unplugged at like 38% or something. The whole session was an 800v (740ish) and the cable never even hinted at getting warm. My next try is the Mercedes Benz /chargepoint 350kW

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