OT after hours
So that Nikola video:
When driving in a parking lot:
View attachment 562114 View attachment 562113
The fuel cell was putting out 97kW
The pack was putting out 135kW (199.5 x 676)
Load > generation
When stopped:
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The fuel cell was putting out 95kW
The pack was putting out 80kW (119.5 x 673.5)
Load < generation
However, if the fuel cell was charging the battery, the BMS reported current should be negative (like during their regen demonstration).
It did manage to gain 0.8% SOC during the drive. Or rather, it gained 0.4% on the drive and 0.4% in six seconds 7:06-7:12 on the video (could be one bit of precision).
Tesla Semi Specs: <2kWh/ mile at 60 MPH -> 120kW load average WHEN DRIVING 60 BLEEPING MPH with 80,000 POUND GROSS!
He also claimed only they have four drive motors...
This is not 100% correct.
When they accelerate, the BMS current goes negative, they even say that in the video @ 5:35.
And you can see that they accelerate at that time.
And BTW there is no way that the battery will have to "put out 80kW" when stopped. Charging at 80kW from the fool cell and using the remaining 18kW from the fool cell for cooling and stuff sounds more likely...
The most power draw from the battery was -410A * 677V = -273kW during acceleration. I guess the fool cell works in parallel then and the total power output is thus about - 370 kW.
I think when they were "cruising" the battery was charging at about ~ 100A * 669V = 67kW (@ 5:59). Thus they use 97kW (FC) - 67kW (battery charging) = 30kW for driving and cooling. But this part is just a wild analysis of a shaky video where you can't saw then they just hold the speed. I could be significantly off there (easily 2x more).