Mongo,
I'm assuming even with a 50amp 208v connection, you can potentially set software based limits on how fast it draws electricity in the car settings? Perhaps this is my solution. Maybe I can tell it to charge the battery to full over a 10 hour period knowing I will be at the restaurant for 12+ hours one day, and the next day I pull up, and know I will be driving all day, tell it to charge the battery in 3 hours, starting from plugin?
As for power costs, I'm in So-Cal, and commercial vs residential is a HUGE difference in how electricity costs work. In my house, I could draw 2,000 Kwh over a month and have a $500 bill. At the restaurant however, I could turn on power for a single hour and draw a total of 50Kwh, and turn the electricity off for the rest of the entire month, and be stuck with a $1500 bill for that single hour of use. Residential is billed purely on use. The more you use, the more you pay. They also have tier programs so lower amounts of electricity pay a lower rate, and as you draw more throughout the month, you get passed the initial tier A, and work to Tier B, C, and D. Each tier having a higher price per Kwh.
This is why I want to use the restaurant electricity to charge my car. I have enough solar to damn near eliminate my electric bill at home. That said, they don't give nearly as much credit for overgenerated electricity as delivered. If after an entire year, I use a total of 20,000 Kwh, but I generated 22,000 Kwh, I may still have a bill, because the time I drew electricity from the power company was during their "updated" peak use time based on the fact that everyone who decided to go solar as they complained "We shut down the last nuclear power plant at San Onofre, CA, and we are paying an arm and a leg to buy it from AZ, so please help us compensate for electricity or we will have brown outs!" suddenly turned into "We aren't making enough money to pay our costs since everyone went solar, and now we want to charge them delivery fees to use our power lines" even though we know that AZ Power suppliers didn't charge them per KWH delivery fees.
Outside of that BS, basically, when it comes to commercial electricity, the big expense isn't your usage, but supply and demand costs. As I said, I could use electricity for a single hour and have a $1500 electric bill for 50kwh. Commercial concepts are "What is the most amount of power we have to potentially make available to this restaurant? 50KWH? Ok. So to Guarantee we have 50kwh available to you at any given time of day or night, we need this $1400 fee. So the bill ends up being $100 in usage and $1400 in guarantee fees.
There's an introduction to the bullshit that is Commercial Electrical!