[red-beard]

The issue is charging 75% of 800kWh in 30 minutes. This requires 1.2MW. A "standard" house has a 150A service, but typically uses no more than 20kW at a time, maximum. 1.2MW is equal to the MAXIMUM power of 60 homes and the average power of well over 300 homes.

Even if the cables for the "charger" were run at 1000VDC, the current will be 1200 Amps. Let's split this up into 100 Amp sections, you would need 12 pairs of #2 wire.

Since most trucks can operate a maximum of 10 hours per day, there is roughly 14 hours per day for recharging. The 1200 Amps will drop to around 60 Amps, to fully recharge the batteries. This is much more "do-able". Of course batteries do not charge in a linear fashion, so the 60 Amps average will need a maximum current to be more than double that actually charge the bank in 14 hours.

Another issue is heat. If the battery charging is 95% efficient, then 5% of 600kWh is wasted. This is 60kW of heat generated! And this is the loss in the batteries. You will need a massive cooling system (see the Power Wall!) to reject 60kW of heat. The heating system for my building is 12kW and it runs for maybe 5 minutes to heat 650 square feet.

No, the engineering issues are not trivial.