That Tesla Data: What It Says and What It Doesn’t
Two bits are completely non-sensical to me, is there any battery technician or otherwise knowledgeable person that can indicate in what conditions this makes any sense?<p>> Beginning early in the morning of my second day with the car, after the projected range had dropped precipitously while parked overnight, I spoke numerous times with Christina Ra, Tesla’s spokeswoman at the time, and Ted Merendino, a Tesla product planner at the company’s headquarters in California. <i>They told me that the loss of battery power when parked overnight could be restored by properly “conditioning” the battery, a half-hour process, which I undertook by sitting in the car with the heat on low, as they instructed.</i> That proved ineffective; the conditioning process actually reduced the range by 24 percent (to 19 miles, from 25 miles).<p>If there is one thing that will use up large amounts of energy it is electric heating, I find it hard to believe that using a heater as a consumer would regenerate the battery capacity in excess of what the the heater is consuming unless most or all of the energy was directed at the batteries. The exterior of a car will drain heat energy about as fast as you can put it in under cold conditions (or faster...).<p>> It was also Tesla that told me that an hour of charging (at a lower power level) at a public utility in Norwich, Conn., would give me adequate range to reach the Supercharging station 61 miles away, even though the car’s range estimator read 32 miles – because, again, <i>I was told that moderate-speed driving would “restore” the battery power lost overnight.</i> That also proved overoptimistic, as I ran out of power about 14 miles shy of the Milford Supercharger and about five miles from the public charging station in East Haven that I was trying to reach.<p>That does not make any sense either. Any kind of consumption will ultimately reduce the available range, you don't restore by removing joules from a pack.<p>I've lived in a house powered with batteries, solar and wind for a long enough time to know that indeed temperature affects battery capacity, sometimes dramatically. But consuming power under cold conditions never put energy back in. Is this different for the kind of batteries that the Tesla uses?<p>Or is the 'Tesla said' claim just an effort to get out from under the apparently non-sensical decisions that were made here?<p>Or are Tesla spokespeople and product gurus totally clueless (which would seem to be very hard on the imagination)?<p>All the hard data from the Tesla logs except for the 'shutdown' is contradicted by words apparently spoken (and probably unverifiable except for 'he said/she said' style debate) rather than actually refuting the data.