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virtualdom | 5 years ago

You've compared the range of a Model 3 driven at 75MPH to a Camry driven at 48MPH, for one thing. But I don't know why you would bring passenger cars into the discussion, since you can't scale performance linearly from cars to class 8 trucks. You've already made that mistake by scaling cabin heating requirements linearly with battery capacity, for example.

> For class 8 trucks wind drag is a very small percentage of the losses, rolling resistance from weight is the largest loses.

According to this source[1], for class 8 trucks at max gross weight on level road, aero and rolling resistance losses are the same around 50MPH, and aero dominates after that. Is that source wrong, or out of date? Source says "aerodynamic drag and tire rolling resistance are major contributors to energy loss" - neither is a "very small percentage".

From everything I've read publicly, EV semis won't have transmissions or transaxles, just motors on the drive shafts (4x120lbs). Not sure where you get 6k lbs, even including the "added copper wiring".

I can totally see a 1-2 ton payload advantage for diesel+CCS over EV semis when the required range is 500+ miles, just not a 15k lbs advantage. Ultimately the market will decide what tech to use for different routes though, and I agree that a variety of solutions will be utilized.

[1] https://www.nap.edu/read/13288/chapter/7#79

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