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WanderingEng  ·  2572 days ago  ·  link  ·    ·  parent  ·  post: Tesla Semi and Roadster Event summarized

    megacharging: 400 miles (644 km) per 30minutes

Google says seen trucks average 6.5 miles per gallon of diesel. Wikipedia has 10 kWh/L which converts to 37.6 kWh/gal. Wikipedia also says diesel engines can be 45% efficient.

So to get kWh/mile It's 37.6/6.5×0.45=2.6 kWh/mile. That doesn't include regenerative braking, so let's just round down to 2 kWh/mile.

So 400 miles would mean 800 kWh, and getting that in 30 minutes means 1.6 MW. I'd love to see how Tesla does that.