Tag Archives: Tesla

Tesla Roadster

Tesla’s Refrigerator Sized Cooling Problem

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Electric cars require cooling systems. Not nearly to the extent that a combustion engine vehicle does, but lithium ion batteries get hot. Put your laptop on your lap for an hour and you might start cooking your own thighs. So you can imagine, thousands of lithium ion batteries will require a significant amount of cooling. There are 6,831 lithium-ion batteries in the Tesla Roadster, each about a third bigger than a typical AA battery. They’re linked together in a unique package that incorporates liquid cooling, safety fuses, and sensors that prevent the cells from experiencing what battery engineers like to call “thermal events.” The batteries feed 410 volts to the Roadster’s air-cooled AC induction motor. Here is the AC cooling system, for the cabin and battery pack:

Telsa Roadster AC Cooling System

Martin Eberhard, former CEO of Tesla Motors, is making the claim that the current cooling pump is working overtime, a lot of overtime. In, fact Eberhard stated that the pump for his Tesla Roadster seemed to be on all of the time, which is completely unnecessary after the car has been parked for an hour or so. Now the ESS cooling system is crucial to the life of the battery, but this is ridiculous. So, Martin Eberhard, being the electrical engineer that he is, installed one of those electric meters you see on the sides of houses ahead of his car’s charging station. Then he charged the car up fully, unplugged it for four days, then measured how much power it took to recharge the battery after the car sat, fully charged and cool, for four days. Doing some math, he found the car consumed 1,278 kWh per year, from just sitting there. That is enough to power two big refrigerators. Not only is this significant on your electrical bill, but this drastically reduces the lifespan of the pump.  Eberhard explains in his blog post:

The second question is the life expectancy of the pump. I expect that Tesla used an automotive-grade pump from a good supplier. I am also sure that no other car leaves a pump running 24/7. Consider a typical car designed to run for 200,000 miles at an average speed of 30 mph. Such a car is designed to run for 200,000 / 30 = 6,666 hours. Let’s say the designers want some room for error, and design the water pump for that car to operate for 10,000 hours without failure. 10,000 hours life expectancy would be a good-quality automotive pump.

Now, let’s run that same pump 24/7 instead of the couple of hours per day it would run in our typical car. Running 24/7, that pump will pass 10,000 hours in only 13 months. That’s all – end of life. Just to make it through Tesla’s 3-year warranty, that pump would need to last 26,280 hours without failure. To last just 5 years, the pump would need to run 43,800 hours. Hopefully, Tesla installed a pump rated for at least 50,000 hours of operation without failure, implying an MTBF of at least 70,000 hours, assuming an exponential failure distribution. Does any automotive parts manufacturer even make such a pump?

Tesla also told Eberhard that the new Drivetrain 1.5, that they guarantee to retrofit all the purchased Tesla Roadsters with, will not make any changes to the pump. However, in a recent article from TIME, Elon Musk responded to Eberhard’s cooling pump complaints and also shed some light on the nature of their tumultuous business relationship:

Eberhard, the ousted cofounder, says Musk interfered with the design of the roadster, demanding changes that were costly and led to delays. These included installing electronic door latches, building a lightweight carbon-fiber body and lowering the doorsill by two inches. “It cost us $1.5 million to lower that doorsill,” Eberhard says. “We would have been better off to have a simpler car shipping a year earlier.” Musk says his design changes were not the cause of delays. Eberhard says that despite Tesla’s green-tech credentials, the roadster has a coolant pump that operates even when the car is parked, wasting as much electricity as two refrigerators. Musk says that will be fixed next month. Eberhard also gripes that Musk controls the board of directors, whose members include his brother Kimbal Musk. “I’m very unhappy about what’s happened to my company” under Elon, says Eberhard, who still owns about 3 percent of Tesla. “I think he’s a terrible CEO.” Elon Musk responds that “Martin is the worst individual I’ve ever had the displeasure of working with.” –TIME, An Electric Car Loses Its Juice

While Eberhard does have a legitimate complaint, keep in mind he probably takes some pleasure in publicly criticizing Elon Musk’s Roadster. But in the end, both sides just want to see the Roadster improved, and hopefully the issue can be fixed fairly easily and cheaply.

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Play by Play of 60 Minutes’ Electric Car Episode [VIDEO]

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:25- “The jury is still out on whether electric cars can ever really be practical”

The EV1 and Toyota Rav-4 EV showed us that electric cars could be completely viable alternatives over 10 years ago, using lead-acid batteries.

:58- “This (Tesla Roadster) is the first, all electric sports car…”

C’mon Lesley, you’re better than that. Forget the Venturi Fetish, Hybrid Technology’s LiV Rush, the Wrightspeed, and the Tzero; the Tesla Roadster was the first electric sports car. Why? Because an intern at CBS Googled it.

2:50-Enter Bob Lutz, Vice Chairman of GMBob Lutz

Is it me or could this man talk me out of driving a Ferrari off the lot for 10 grand. He is a terrible spokesman. He just sounds like he would rather be playing with his helicopters, his countless sports cars, and his Dassault/Dornier Alpha Jet in German Luftwaffe colors (image right).  It sounds like hes doing this because he doesn’t want to be embarrassed by Tesla, not because he believes in the product.

4:13- “GM is already touting the car even though don’t yet have a working prototype.”

Really, not even a working prototype? GM had EV1’s with 160 mile ranges before they canceled the program.  What happened?

4:25- “The real trick on the car, is software. The car needs to know where home plate is.” -Lutz

Oh, thats the holdup.  The hold up is developing a completely unnecessary amenity that will tell the car how close you are to home.  Use GPS, hook it up to the gasoline activation system, done deal.  Why are they even working on this? If the charge is low, the gasoline extender should just come on regardless of where you are, for safety’s sake.  This is like delaying a trip to Mars because they can’t decide what color to paint the ship.

5:55- “People say, I hope you enjoy the billions you got from the oil companies, you swine” -Lutz

Well, do you?

8:45- Ethanol and hydrogen all had problems, won’t that happen with the electric car?

Ray Lane- “It could.”

Come on man, your selling electric cars. You should have a practiced response to this.  New, cheap, clean, and renewable sources of electricity are being built every day.  Electric cars can run off electricity that is available everywhere.  The infrastructure is already here, as well as the technology; electric cars are the only vehicles that can someday have absolutely no carbon emissions. You cannot compare it to ethanol and hydrogen.  Those were fake solutions to begin with. Why? Because the oil companies want to sell ethanol and hydrogen.

10:20- Yeah, but they (silicon valley) have no experience in the car business…-Lutz

Grasping for straws…

Model S

Anticipation builds for Tesla’s Model S

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Could Tesla’s $60,000 electric sedan look something like this?

Aston Martin Rapide

That is what many are speculating after The Sun columnist, Ken Gibson, claimed he was given a “sneak preview” of the Model S at the end of his recent online column. Thus priming the the rumor mill at the telsamotorclub.com Model S potential design forum, and leading many to claim the Model S will look like the Aston Martin Rapide concept. This keeps in line with Tesla’s claims that the Model S will be a huge, very long, four door hatchback.

The design also fits the dimensions of the Dodge Magnum Mule that was spotted next to a Tesla Motors facility with no exhaust pipe and test wheels, also in the forums:
Whitestar Mule

This is still all speculation, but anything rolling out of Tesla Motors is sure to be superbly designed and built, given their track record.

Hybrid Technologies

Evolution of an Electric Supercar (LiV Rush)

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This is a cool old video on the Hybrid Technologies, L1X-75:

This car is now known as the LiV Rush and the Hybrid Technologies website says the beast accelerates from 0-60 in 5 to 6 seconds. Really pedestrian when you compare that to the 3.1 second claim in the video from over a year ago. What’s with the fluctuation? This car was really ahead of its time as a purchasable electric supercar. I’d blame its failure to really take off on its plasticky, kit car aura; as recent electric sport cars have more refined, individual looks. Compare and contrast:
Hybrid TechnologiesTesla Roadster

So that’s where Hybrid Technologies’ most recent evolution comes in. Popular Mechanics gives a pretty good overview of their latest concept electric car. Complete with unique exterior and hopefully a 150-180 mile range. With this still unnamed prototype, Hybrid hopes to compete with Tesla and Fisker for supremacy in the American electric supercar market by late 2009.

Chevy Volt

On the Chevy Volt

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Chevy Volt

The Chevy Volt is starting to look more and more like a GM pipe dream every day. For instance, this little bit of anecdotal evidence:

NHTSA, The National Highway Traffic Safety Administration, proposed earlier this year that U.S. automakers must achieve a 25% increase in fuel economy from the 2011 to 2015 model years. When the NHTSA asked GM why they left out the Chevy Volt in their submitted plans, GM basically responded by saying the Volt was a low-volume application and would not really be widely produced in that time frame. GM spokesman Greg Martin was quoted,“We’ve been very cautious in terms of the volume, just because of the innovation and the technology associated with that vehicle. There’s a note of caution that, yes the technology is breakthrough, it is a game-changer, but as with any new game-changing technology, there needs to be a reasonable expectation set in terms of volume.”

Game-changer… Right.  If privately owned companies like Tesla are coming out with cars that travel 220 miles on a charge, than I would hardly refer to 40 miles on a charge before a gas generator has to kick in to recharge the battery as game changing.  GM has access to vast amounts of resources and this is the best they can come up with? And they continue to beat this FlexFuel ethanol horse to death, which will never take off.  We might as well run our cars on fresh produce and livestock, rather than still relatively cheap, useless in any other application, oil.  Anyways, I’m sidetracked and I’ll have to write another post on the Volt later when they give me a good reason to. But for now, I don’t have much hope for this still very much a concept vehicle. Hope they prove me wrong.