Peak charging power is the same 97kW on V4 superchargers, at least that’s what I’ve experienced so far. I think Tesla has upgraded some charging stalls to V4 and not the power cabinets.
This is exactly correct. There are no Tesla v4 power cabinets anywhere in the world, at least not public ones. Tesla has officially announced them, and says they will start installing them later this year. I suspect they will be quite rare until well into 2026 or maybe even 2027.
In the meantime, right now there are some stations with v3 power cabinets (400v) and the newer v4 dispensers with the longer cables. I've seen this called v3.5 stations, but I don't think that is official Tesla terminology.
When the new v4 power cabinets start coming out later this year, they will be 800v, so our EGMP vehicles will be able to charge at full speed (I got 237kw peak at an EA station over the weekend). And they will have long cables, so you won't need to take up two stalls. At that point, the only downside of charging at one of these stations will be that you are paying Elon Musk.
Right now, no extension cable is needed if you charge at a "v3.5" station - they have long cables so all you need is an adapter. But you are still limited to 97kw, because that is all the power the car will take at 400v (the car then internally converts the voltage to 800v - it's this converter that is limited to 97kw).
The only situation where an extension cable might be required is for charging at the old style v3 stations. These have very short cables, so the GV60 has to be parked in a position that blocks two stalls. This also means that you CANNOT charge unless two consecutive stalls are available. Some of these stations are quite busy, so you might wait longer for two stalls to open up than you would to go to an EA station.
I know what you mean about the extension cables, but I still have hopes for it.
For our cars specifically, I also have hopes for this. 97kw at 400v is only 242 amps. There are plenty of air cooled cables that can handle that amount of current. A2Z says that the cable will be rated for 350 amps, so our usage would be well below the limit. Since the vast majority of Tesla stations are going to have these short cables for years into the future, I think this extension cable might be a good investment for owners that plan to do a lot of road trips.
On the other hand, for a 400v car this extension cable might be a bit more iffy, since it wouldn't be limited to 97kw.