Agreed, but I think we're working on different assumptions. The R1 vehicles have large enough batteries that the difference in voltage materially matters compared to a max C rate and charge curve.The pack voltage makes no difference in all these comparisons - C-rate, charge curves, etc.
800V charging allows for higher kW (and C rates), but the Hummer and (eventually) the Rivian will utilize 800V charging on 400V packs (or 900V on 450V for the Rivian).
But, as an example, the Rivain charging at 450V and 450A would be a touch over 200 kW. Charging at 900V and 225V yields the same charge (200 kW) and C rate.
I'm working on the assumption that current R1 vehicles will/may stay at 450V if released at 450V and are limited to ~200 kW (maybe 225 at 500amps). But jumping up to 800/900v enables up to ~350 kW. I'm just not convinced by the snipped of RJ said and what's on the website that the *current* gen of vehicles (for example LE) will have that upgrade if it's not available at launch. The vehicles were delayed due to covid, if the hardware is there to enable the patent type switch, I don't really get what would have stopped them from enabling it on the vehicles by now.
I've taken his statement as meaning the next iteration of vehicles or a new model year would have that ability.
Out of curiousity, why reference 900V at 225 amps? Just to show that the kw is the same? There's 900V chargers from EA push out more than 225a, right? Or did I miss something.