Concerning "DCFC kW may not be 'very useful' information" ...

I hadn't looked in a long time, (the older units listing "max kW" based on unreasonable voltages of 500V, such as 50kW because it can provide a max of 100A at 500V) and I was surprised at the published specs for the newest DCFC units being installed.

For example, the last one I really paid attention to was the ChargePoint "Express 250", it is listed as "max 156A, 200–1,000V DC" . It turns out that the max power is 62.5 kW, not 156kW (156A x 1000V) - which works out to 156A around 400V (which is a reasonable V for today's cars). The "proto" ABB "150 kW" DCFC in Fremont, CA will supposedly offer a max of 350A (which I find

*very* hard to believe, as the cables don't seem to be liquid cooled) up to 920V. Realistically, battery packs these days run up to 370-375V (approx), so it's really a "130 kW" unit (and if it can only supply 200A, it's a 75 kW unit).

In fact, 250A at 400V (100 kW) is pretty much more than any (non-Tesla) car being sold today can pull. There are some cars that will pull 200A, but not many (if any) that will pull more than that. Now, since no (non-Tesla) EV today will pull over 200A, the "150 kW" (75 kW) unit in Fremont is just fine for every one driving around now - OR in the near future (2 years). Honestly, I don't understand why anybody is paying to install anything that will deliver over 175-200A (unless the prices for "twice the power" are pretty close to the 200A units). I understand "future proofing", but I think that it would be a better idea to install

**twice the number** (say, 4 instead of 2) of DCFCs that can deliver up to 200A (with thinner cables), and a transformer/power drop that can handle all of them. Trench/install ONE of the units with the cables necessary to supply "300 kW", and *IF* those mythical unicorns of super-fast charging cars ever get built and sold, go back in 4 years and swap out ONE of the units for a higher power one (that allows power-sharing, so it can pull a max of 350A, but the other {paired} unit can only pull 100A when the other is at full power, but will ramp back up to 200A as the demand on the other ramps down.)

Again, if the unit prices are similar (only 10 or 15% more) you might as well install ONE 250 kW (350A) unit, maybe ONE 150kW (250A) unit, and all the rest 80 kW (175A) units. So a max of one out of 4 or 6 will be the higher power units. And/or, only have the 250A+ units every other station (150 miles apart).

Ah well, enough rambles for this afternoon.