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The long answer: As far as I understand, the v3 charging cabinets are interconnected via a DC bus, so they can share power with each other. If everyone showed up with low state-of-charge and plugged into all the stalls at the same time, I think you'd only get about 80-90kW per stall (assuming no power packs connected to the system).
But in reality, that rarely happens. Most of the time, there's enough spare capacity to maintain a reasonably high charge rate for all the stalls in use. Someone please correct me if I'm mistaken; I'm not an expert.
So on Monday PG&E was there installing. Now we just wait until they get the crane out to iinstall the light poles that are still sitting on the ground. Otherwise, it appears done, although the construction fence is still up.
Went by yesterday. 4 people working. Light poles now installed and clean up looks like it is beginning. Transformer cabinets are open and there is wiring taking place. I should have stopped and asked when it would be up but it looks like it is getting closer.
Ok, some good news. PGE is on site installing transformers and construction fence is coming down this week. I spoke with the superintendant on site and he indicated Tesla plans to go active with the Supercharger at the end of the month.