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> megawatt-hour territory. A tank full of diesel fuel

A full diesel tank on a truck is circa 13 megawatt hours

A bigger risk than the energy density (or how bomb-like it is) must be the self-sustaining fires.

Per mile driven, electric trucks have less fires than diesel ones but when they go on fire, they can be harder to put out.

It's different risk profiles, diesel can run downhill in an accident and create a fairly hard to contain situation. BEVs don't really do that but they reject attempts to snuff them out.

I like the Edison Motors concept a lot. Diesel generator running at peak efficiency charging a small battery. From a fire hazard point of view, probably worst of both worlds when it does go up in flames but i'd still expect less fires than conventional diesel trucks, based on nothing but the gut feeling that the drastic simplification of the drive train results in fewer ignition opportunities.



> A bigger risk than the energy density (or how bomb-like it is) must be the self-sustaining fires.

The whole problem with batteries is the oxidizer is already included. When the cathode decomposes, it turns into an O2 factory. There really isn't a limit to how fast this can go if there is a structural compromise of the battery. Diesel fuel requires external oxygen constantly. This makes it much easier to extinguish.




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