1.2 MW x 20 charging stations = 24 MW. How are they going to deliver that much power to many such “refueling” stations?
My guess is the cars would mostly use existing infrastructure during early stages of release. Solid state batteries are suppose to have better heat tolerance than the LI batteries. At a 350KWH charger that much energy isn't being dumped into a LI battery. It is more like 200KWH when LI batteries are at 20% capacity. At around 50% of capacity, the charge rate starts to slow. If the solid state battery car can use the full 350KHW rate, they will be out of the charging station sooner.