Tesla founder & former exec Martin Eberhard has
posted on his blog about how shocked he was
to discover how much power his car wasted sitting idle (battery coolant pump running constantly):
Quote:
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Whoa! The car consumed a whopping 14 kilowatt-hours in four days, just sitting there! Doing the math, the pump draws about 146 watts all day long, all night long, every day. This works out to 1,278 kWh per year. To put this in perspective, a really nice 26-cubic foot side-by-side refrigerator with an ice maker uses only 618 kWh per year, so this pump is the energy-equivalent of two huge refrigerators!
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The car basically wastes about 20% of its battery capacity (and lifecycle) circulating coolant. Note this is for HIS particular driving patterns & style; YMMV.
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.