My points of skepticism: 1. Semis . A typical long haul semi gets well under 10MPG. In some cases not much more than half that. They are heavy and need a lot of energy to move. A Tesla Model S weighs 4650 lbs and has a range of a couple of hundred miles. A semi truck can weigh up to 80,000 lbs. That is a lot of weight to get rolling and a lot to pull up a grade. Semis spend a large part of their time driving at highw…
1. They'll be able to line the entire trailer with batteries. Elon's pretty good at physics and engineering: if he says this can be done better than existing gas-powered semis, you're not going to be able to prove him wrong with some back-of-the-envelope arithmetic, as if he hadn't considered this. Obviously he has and knows it will work. Tesla didn't get this far on vague conjecture. 2. Maybe so, but it will happen,…
But that's an enormous inversion of expense that falls on the trailer owners. The tractor-trailer model works so well because it concentrates complexity and cost in the tractor.
At present trailers are mechanically fairly simple and require only routine servicing with a basic toolkit. They draw power from their tractor. An owner can maintain a fleet of trailers to match their peak demand and are immediately available. Just charter a tractor and away they go.
Battery-equipped trailers will be much more complex, heavy and maintenance-intensive. More expensive but with a smaller payload and prolonged periods of unavailability whilst charging. The cost of haulage charters will have to reduce by magnitudes to make that an attractive preposition.