Tesla Roadster a power hog?
Tesla founder & former exec Martin Eberhard has posted on his blog about how shocked he was :D to discover how much power his car wasted sitting idle (battery coolant pump running constantly):
http://tbn0.google.com/images?q=tbn:...20Charging.jpg Quote:
He's also been tracking his total efficiency, at the wall: 439 watt hours/mile That's right: turn on four (point 39) 100 watt light bulbs for an hour, or drive 1 mile. Your choice. This includes the "idle wastefulness" that he discovered, and is frankly not very good. |
Yikes, looks like someone needs some lessons in ecodriving!
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Likely. But then that'd be like trying to teach a Ferarri driver to ecodrive. Probably ain't gonna happen.
For comparison, the ForkenSwift's average over winter & summer is 312 watt hours / mile (at the wall). Its built-in "efficiency hit" comes from having worn out batteries. If they were newer, it'd be better than that. |
More perspective: Eberhard's lousy 439 Wh/mile is still 76 MPG equivalent. Compared to the Ferarri, OK, not too shabby.
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Quote:
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Energy conversions used:
- 3412 BTU per kWh - 114,500 BTU per gallon (US) |
Ok; I was using 34.8 MJ/l, apparently from Oak Ridge National Lab, via Wikipedia. 114,500 BTU/gallon is 31.9 MJ/l, which explains why our numbers differed.
I really hope they're going to bring their efficiency up. That 33 mpg CO2 number could be quite damaging to its eco-reputation were it widely known. The trickle-down effect the smaller EV players wouldn't help matters either, even if their efficiencies were higher. |
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