Reviving this thread, any recent information for or against a 1 MW cabinet being able to charge 4 teslas at 250 kW? In the extremely rare case 4 hot batteries arrive at 8-12% will we see the full 1 MW? I am skeptical, I'd actually like to test it sometime if 3 other LA people are game.
Definitively not possible. The max output possible to serve 4 stalls from the same V3 cabinet is around 900kW, so ~225kW/car instead of 250. And this would only be possible at sites that have a large battery system attached (600kW or higher) or where there are at least 2 additional V3 cabinets that aren't serving other cars (i.e. need 3 cabinets total serving only the 4 cars trying to max charge). This limitation results from the architecture and hardware of the V3 system. Each individual supercharger cabinet can only draw 350 kVA (AC) from the grid and can also draw up to 575 kW from the other cabinets in the group (and from a connected battery if it exists) via an interconnecting DC bus. So in the "standard" V3 supercharger site that has no battery and only 2 supercharger cabinets, the max output is only around 630 kW (± 30 kW). To get up to the 900 kW level, you need at least 3 cabinets or a connected battery system. It's unclear how the cabinets would allocate the available 900 kW, so the experiment would still be interesting. Will all cars get totally even power? Or will some get the max 250kW, and the last to plug in gets hind tit? And since the V3 superchargers that Tesla builds in CA tend to have more than 2 cabinets, you're in the right geographical area to test it. If it happens, let us know.
Thanks, this is helpful. Do you have any cabinet pictures to share? I will try to test it if I can get some volunteers with LR batteries. The new Hawthorne v3 SCer seems like a good place. @Bighorn and I were just discussing this topic. I am curious what other people see.