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| User Info | America's Scam, Part 65023; entered at 2017-11-26 10:43:52 | |||
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Jayhawk Posts: 59 Registered: 2010-08-20 San Diego, CA 
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Actually, it's bad, but not quite as bad as your numbers reflect. Batteries are rated in kilowatt-hours (kWh) which is a measure of energy, rather than kW which is a measure of the rate at which they can deliver power. But doing the calculation based on energy still makes Tesla a moron. Today's freighter gets an average of 6.3 miles per gallon of diesel, which contains 40.74 kWh of energy. So to provide 90% of 400 miles would require the equivalent of 133.3 gallons of diesel, or 5432 kWh. Multiply by 90% and then by two to get the charging rate, since we are doing it in half an hour, and we get a charging rate of 9777.6 kW plus waste. That's not undoable, since at 400 volts it would only be 24 amperes, but it's pretty sizeable. On the other hand, if those are 12v batterys... Yikes, that would be 815 amps, which is not something I would want to be messing around with at a truck stop. In the old diesel boats we routinely dealt with 400V at up to 3000A, but that was carried by solid copper bars that had a cross section of 3" x 6". Can you imagine the size of the cable that you would be plugging into the truck that is carrying 815A? Or even 410A if they were using 24V batteries. Your post also points the feeble economy for electric. At 40.74 kWh/gal and $.07/kWh, electric energy works out to $2.85 per gallon equivalent for diesel. Gasoline would be higher, since its energy content is significantly lower than diesel. Plus, of course, where can you get electrity for $.07/kWh? If you live in San Diego, electricity is costing you a bit over $.30/kWh while gasoline,at $3.25/gal, is costing you slightly under $.09/kWh. Last modified: 2017-11-26 11:18:11 by jayhawk
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