Still nice to have datapoint. They allow us to push out the location of the envelope, point by point. That's really good.
Until they enable more than 250kW from a V3 (if it is possible), I would roughly expect, from the Model 3 curves, with a direct scaling (V3 Supercharging Profiles for Model 3):
250kW up to about 33% SoC, tapering to about 205kW at 50% SoC, and 46kW at 90%.
Since this one is doing 54kW at 90%, apparently it has more capability than projected (about 17% better than expected). I don't completely understand the reason for that, other than since these cells can be discharged so fast, perhaps they can also be charged a bit faster than the 2170 cells. (This may have always been the case for 18650s (assuming the Plaid pack is 18650s here...), but due to wiring constraints, Supercharging peak currents were limited. I don't have a latest curve (at high SoC) for the prior version of the S, which may be a more appropriate match for doing these projections at the lower currents at higher SoC.)
Anyway, taking that 54kW at face value, and backwards projected, that would add 17% to the scaling (it may not be valid to do this all the way across the SoC range).
So 103kWh/78kWh * 1.17 = 1.545.
So that would taper to 240kW at 50% SoC, and the plateau of 250kW I would expect to end around 45-48% for an ideal charge (rather than my expectation of 33%). (!!!)
That would be pretty nice.
And assuming that 17% adder really holds all the way down the SoC range (this doesn't immediately follow, I think, since at higher SoCs there may be other rate-limiting processes, which the max charge rate at lower SoC, where wiring limits and heat might be an issue, might be decoupled from), that would also add to the 330kW projected peak and potentially mean 385kW or so would be the "actual" peak (I'd guess they'd just make it 350kW). (This "actual" peak gets confusing because we don't really know where the limit is coming from, for Model 3.)
As discussed, though, the actual peak isn't all that important - it's how long that plateau extends. Seems possible that it could extend 350kW up to about 30% SoC, with a SuC capable of it, IF the assumption about scaling high SoC charge rates to low SoC rates actually holds.
Another reason this might be invalid is that 90% SoC may not actually be 90% SoC for the battery, if they have voltage-limited it. We don't know that yet until we get SMT data (really the only way to tell). If they're capping the battery at 95% SoC or so, then 90% UI SoC is more like 85% true SoC. And that would scale to ~60kW "expected" rate. So it doesn't take much of a cap to throw off these projections.
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