Electric Car Prediction - Whatdayathing???

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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Tue Aug 14, 2018 7:03 am

BeauV wrote:
kdh wrote:I've owned two 911s, and they've been reliably perfect.

The Model S is fast 0 to 60 and the batteries are low in the car so handling is reasonable, but to compare the track performance to something like the technology on the Porsche 918 is ridiculous.


Yup, you have to compare it to a Panamera, which it clobbers. Also, the track performance of the Model3 is simply faster than its competitors. (BMW 3, Audi A4, MBZ C) One has to compare horses to horses not horses to cows. Tesla hasn’t built a 918 competitor other than the initial roadster, that would be something to compare to a 914/6.

On the drive home from StFYC tonight I clobbered a Nissan GT/R. Nailed it off the line and got 4 car lengths by the time I hit 60. The kid didn’t know how to spool up the turbo before the light turned green. He also doesn’t let the computer shift and revs the thing way way way too far past the tongue peak. Easy meat for the Tesla. (I can’t believe I’m still drag racing at 66!! Don’t tell the Admiral!)

Beau, horses to horses is not Model S to Panamera, it's Model S to the Mission E. What electric lacks currently is repeated fast 0 to 60s without the batteries getting too hot.

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Re: Electric Car Prediction - Whatdayathing???

Postby Jamie » Tue Aug 14, 2018 9:20 am

I think it's improving quickly and given that most conventional sports cars don't withstand more than a couple hot laps without modifications, it's not too bad.

https://www.roadandtrack.com/new-cars/road-tests/a22625274/tesla-model-3-performance-track-test/
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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Tue Aug 14, 2018 9:47 am

Will be interesting to see how well Porsche can play this game.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Tue Aug 14, 2018 10:16 am

Well, first, Porsche will have to actually ship a Mission E. Then, they’ll have to put it into production at volume. Then, they’ll have to compete with whatever Tesla is shipping at that time, not the 10 year old Model S. Then, Porsche will need to figure out how to build a network of high-speed charging stations or figure out a way to poach on Tesla Superchargers. These are all pretty big hills to climb.
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Re: Electric Car Prediction - Whatdayathing???

Postby SemiSalt » Tue Aug 14, 2018 11:06 am

Apparently, Porsche is entering Formula E. That should give them a boost up the learning curve.
https://newsroom.porsche.com/en/motorsp ... 15186.html
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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Tue Aug 14, 2018 11:25 am

BeauV wrote:Well, first, Porsche will have to actually ship a Mission E. Then, they’ll have to put it into production at volume. Then, they’ll have to compete with whatever Tesla is shipping at that time, not the 10 year old Model S. Then, Porsche will need to figure out how to build a network of high-speed charging stations or figure out a way to poach on Tesla Superchargers. These are all pretty big hills to climb.

Again, will be interesting to see. The idea of letting chargers be a competitive advantage is a new notion. Imagine if all car manufacturers had their own gas stations?

http://www.thedrive.com/tech/20151/porsche-to-install-500-ultra-fast-chargers-in-u-s-by-end-of-2019
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 12:04 am

Yes, it will be very interesting to see. Porsche has the brand to knock off Tesla, the rest not so much.

I was quite stunned to discover that once the little town of Buttonwillow allowed one Tesla Supercharger cluster to be built, they turned down other manufacturers who wanted to do the same thing. "One is enough." was their answer.

I've no idea if this will actually be a sustainable advantage, but at the moment it's a hell of a lead. I do think that eventually the customers will demand "standard" connections. Of course, Tesla does that. But if one uses the "standard" the charge rate is a small fraction of what the Supercharger can do. We'll see what happens when an alternative fast-charge technology emerges.

I still do NOT understand why Toyota is launching a hydrogen powered car. The barriers are gigantic!
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 12:11 am

Keith, I've watched very very closely (since the first Tesla was built) and the charge rate is determined by the ability to dissipate heat as one stuffs electrons into the battery bank. Obviously, it's not limited to the amount of power at the charging station, we'll come back to that.

Tesla has liquid emerged batteries with a giant radiator and a even more gigantic fan to cool the liquid. When a Tesla is on the Supercharger at full chat it sounds like a hover craft.

Given the reason for all this noise from fans and time spent attached to a supercharger is simply the physics of LiIon Batteries.... I do wonder what Porsche is up to. They could build even bigger fans, or some other sort of battery technology, but all of that seems very un-Porsche like. It'll be interesting to see how they do their 15 min. charge.

BTW, the supercharge stations can be overloaded. I've been at one when there are 20 cars all trying to suck as much as they can from the cord. The charge rate goes from 60amps down to 40amps and even down to 30amps. NOT what the Teslarati expects!!! :evil: :evil: But, they can only get a certain amount of power from the grid and 20 Teslas on full power-suck can clearly overload the local grid.
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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Wed Aug 15, 2018 7:00 am

That's my understanding, Beau. You can't quickly get electrons in or out of a battery without creating heat. I doubt Porsche has anything revolutionary up its sleeve. Dissipating heat is a well known process.
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Re: Electric Car Prediction - Whatdayathing???

Postby LarryHoward » Wed Aug 15, 2018 7:51 am

Porsche has a lot of experience in the 918 on getting power quickly into and out of a battery pack, albeit on a somewhat smaller scale as well as full engineering access to Audi's last WEC prototype system so suspect they have a decent plan. With a profit per car of more than $17K USD and $4.1B in PBIT in 2017 just from the Porsche portion of VW AG, they have plenty of IRAD funding available.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 11:33 am

Didn't Porsche end up putting a flywheel into it's race cars because it couldn't do re-charge on braking quickly enough. I think it was about two or three years ago. I remember it because the flywheel went some insanely fast speed at full chat and they could dump something like 2,000 HP (that's undoubtedly not the right number) into it for 5 seconds without things falling apart. I remember the discussion about the gyro effect of the flywheel.

Larry, don't get me wrong, Porsche is a great engineering company and once the VW Group stops spending zillions trying to restore their image after the diesel lying escapade, they will continue as one of the truly great examples of how a government and a public company can work together to really do well. But, physics is physics and the current claims of 15 minute re-charge time don't pass the sniff test. As someone who would LOVE to spend 15 minutes at a re-charger, vs the 45 min. we currently take, I'm seriously interested in the answer to the question.

I find it fascinating that folks in the auto industry have consistently failed to realize what consumers actually want in their car. The starkest example was actually Porsche's initial SUV. Almost everyone, and especially Porsche die-hards, thought that the idea of brand extension to and SUV was idiotic. Let alone a large water cooled V8 based beast. The car made the company what it is today. Similarly, there is constantly a discussion of "range" for electric cars, but when one surveys customers they are fully aware that they don't need long range and they don't rank it very high. Yet the press and the industry keeps harping on it, and the customers keep buying what they wish. In the "range" case, it appears that experts haven't quite figured out that for many it's just fine that they have one long-range car and one short-range electric. My Admiral and I are really odd in that we have two electric cars, most customers have quite reasonably brought a petrochemical car for range and an electric for the majority of their driving around town. I wasn't able to dig it up, but a survey showed that in families who owned one of each, the electric car got used nearly 3 times as often.

Meanwhile, in each market Tesla has entered it has absolutely clobbered the established vendors. Can you imagine what Toyota/Lexus would have given to go from zero to market share in mid-sized lux sedans larger than all other competitors combined in less than a year? While there are certainly plenty of reasons to think Tesla will have trouble, most of them revolving around the highly amplified behavior of the CEO - which sells a lot of ads, the customers adore the cars and keep buying them. I think that the auto industry experts would do far better if they talked to significant numbers of customers rather than other industry experts and auto industry shills. Then, they might have actually produced the market demand that Tesla is capitalizing on. There really isn't all that much innovative stuff in a Tesla, but it is driving into established market segments like a bulldozer with clever marketing and a better product.

If I were MBZ, BMW, Lexus, Porsche, etc.... I would be mortified that I had missed the actual market demand by more than 5 or 10 years. But, one has to remember that a decade ago the auto industry was on its ass and places like Chrysler and GM were being bailed out. It's hard to be "innovative" and "market focused" when you're staring at insolvency. Of course VW group hasn't really had that problem with the solid underwriting of the German and Saxony state governments.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 11:37 am

In case folks haven't seen this, the NY Times does a good job of amplifying how upset the Tesla Board is with their CEO and largest shareholder. As the Sheriff shouted to the posse: "Lawyer Up". It seems that Elon and Donald have a lot in common, and as a result so does their staff's behavior.

Tesla Board Article

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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Wed Aug 15, 2018 1:16 pm

BeauV wrote:Larry, don't get me wrong, Porsche is a great engineering company and once the VW Group stops spending zillions trying to restore their image after the diesel lying escapade, they will continue as one of the truly great examples of how a government and a public company can work together to really do well. But, physics is physics and the current claims of 15 minute re-charge time don't pass the sniff test. As someone who would LOVE to spend 15 minutes at a re-charger, vs the 45 min. we currently take, I'm seriously interested in the answer to the question.

Apparently the answer is simple. Double the voltage and get twice the power for same current/heat.

https://www.caranddriver.com/news/heres-why-the-porsche-mission-e-charges-into-the-future-with-800-volt-technology
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 8:35 pm

Well, the guys are Porsche are correct. If you double the voltage of the entire system, or build some massively expensive and complex switching system so that you only line the batteries up in series when charging, then in theory you can increase the charge rate. There's a reason everyone else is using 400 volts. It's cost. "Liquid cooled charging cables" <--- seriously? Then there's the tiny little problem that most generally used insulator materials won't work at 800 Volts. Even air isn't an adequate insulator at that voltage for short distances. I don't know what voltage I start to really worry about in a car. I was more than little worried about 400 v battery stacks, especially during a crash. But, 800 v is a lot more dangerous.

I think the real question then becomes: What does this cost? There is the cost of the car, but then there is the cost of building 800v chargers? I'm certain Porsche can do it and will do it beautifully, but this is going to be an eye-wateringly expensive car.

Finally, I have to go take a look at the numbers from the battery stacks. My memory is that the total heat created is not a function of voltage, because every cell gets the same voltage. When one stacks up the cells to a higher voltage, the heat in the wires drops but it doesn't have any effect on the batteries. They get hot at the same rate. The heat is a function of Watts, not Volts. I'll have to do more digging, but I believe that Porsche is going to have to design a battery cooling system that can cool the battery stack twice as fast as Tesla. Obviously, it can be done. But it will be LOUD and will burn a LOT of power to run the cooling, which of course will result in the overall power usage going up faster than just 2:1. All this assumes that there is not some nonlinearity in the heating with charge/time. I'll have to check that.
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Re: Electric Car Prediction - Whatdayathing???

Postby floating dutchman » Wed Aug 15, 2018 8:55 pm

Beau, I think the simplest way to look at is that each cell still charges at 3.7 volts (I think).
Yes the charging cable will have 1/2 the current and 1/2 the heat but on a cell level in the battery nothing changes. Smoke and mirrors.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Wed Aug 15, 2018 10:33 pm

floating dutchman wrote:Beau, I think the simplest way to look at is that each cell still charges at 3.7 volts (I think).
Yes the charging cable will have 1/2 the current and 1/2 the heat but on a cell level in the battery nothing changes. Smoke and mirrors.


What I don't know (yet) is how much of the heat dissipation problem is from hot overloaded cables and connectors, which is what the Porsche folks are claiming, and how much is just the heat of the batteries. From earlier conversations (4 years ago) with Tesla the issue was the battery cells. But it is certainly worth digging into. Sadly, my friends all work in the motor bit of Tesla and not the battery bit. I'll have to do some shout-outs to some friends in the battery business to check on this stuff.

Make no mistake, I have tremendous respect for Porsche's engineering skill. They are amazing. If they think they've found a way around the problem it is well worth serious investigation.
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Re: Electric Car Prediction - Whatdayathing???

Postby VALIS » Thu Aug 16, 2018 10:18 am

Boosting the voltage will probably reduce the heating during charge or discharge. If the cables are dissipating more heat than the batteries they are doing it wrong, but they can use smaller (lighter) cables. The battery cell power loss will be reduced since for a given Ah (Amp hour) capacity and charge wattage the cell charge/discharge current will be lower, reducing internal losses and heat (batteries are not pure "Ohm's Law" devices -- their efficiency drops as the current increases).

Yes, insulation and safety become a tougher problem at 800V.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Thu Aug 16, 2018 10:20 am

Paul, I haven't had time to do my homework, but isn't the battery technology the limit on charge voltage? Wouldn't a higher cell voltage during charge imply that they aren't using LiIon batteries?
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Re: Electric Car Prediction - Whatdayathing???

Postby VALIS » Thu Aug 16, 2018 10:27 am

BeauV wrote:Paul, I haven't had time to do my homework, but isn't the battery technology the limit on charge voltage? Wouldn't a higher cell voltage during charge imply that they aren't using LiIon batteries?

I am assuming the same battery technology, just that they are re-stacking the same number of cells in a more-serial and less-parallel configuration.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Thu Aug 16, 2018 11:09 am

Hmmm, thanks, I'll keep reading.

BTW, I remain puzzled as to why Porsche didn't go the technical route of the Karma. It seems a natural given their skills and technology base.

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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Thu Aug 16, 2018 11:44 am

VALIS wrote:
BeauV wrote:Paul, I haven't had time to do my homework, but isn't the battery technology the limit on charge voltage? Wouldn't a higher cell voltage during charge imply that they aren't using LiIon batteries?

I am assuming the same battery technology, just that they are re-stacking the same number of cells in a more-serial and less-parallel configuration.

This is my understanding. They're just using an 800v configuration. The motors run on 800v.

A Very Expensive Decision

Why haven’t others done this before? The answer is primarily cost. In order to make it work, the 800-volt transformation has to involve more than a charging system. While the cells can technically be the same, nearly everything else power related needs to be different—and the costs for all those pieces together are astronomical. For example, you need to wind e-motors to the specific voltage level and power level, said Kramer, admitting that the company was not aware of any 800-volt production vehicles in existence when it started the project.

Porsche developed its own motor, as well as its own inverters and onboard chargers, all with the same control philosophy as 400-volt units but with different power switches that can take 800 or 1000 volts. Some components were designed internally at Porsche and some with partner suppliers that had off-the-shelf components that wouldn’t do the job. “There was nothing in the market we could just buy and use” in the power electronics realm, Kramer said.
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Re: Electric Car Prediction - Whatdayathing???

Postby VALIS » Thu Aug 16, 2018 12:55 pm

BeauV wrote:Image

That is such a iconic shot: Point Mugu, California (a bit north of Malibu). I guess they have it in their 3-D rendering library.
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Re: Electric Car Prediction - Whatdayathing???

Postby JoeP » Thu Aug 16, 2018 1:43 pm

Every car manufacturer in the world seems to use that location. Last time I was down there I was tempted to stop and take a picture of my rental car there.
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Re: Electric Car Prediction - Whatdayathing???

Postby Panope » Thu Aug 16, 2018 5:26 pm

A popular local (Washington) spot for car advertising is the road through American Camp State Park on San Jaun Island. Nice overlook of the Straits.

Got any pics of that view, Paul (Valis)?

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Re: Electric Car Prediction - Whatdayathing???

Postby VALIS » Fri Aug 17, 2018 9:44 am

Steve, here's one from the "Mt. Finlayson" trail, above that road -- sunset over the Strait of Juan de Fuca, the Olympics and Vancouver Island.
Finlayson Sunset.jpg
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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Fri Aug 17, 2018 4:11 pm

TSLA stock's market participants are reacting to Elon's being, well, human. He needs to be, at least on the record with the New York Times, more like Jesus Christ, err, Steve Jobs.

Beau, you'd be great there in the Sheryl Sanberg role.
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Sat Aug 18, 2018 10:50 pm

kdh wrote:TSLA stock's market participants are reacting to Elon's being, well, human. He needs to be, at least on the record with the New York Times, more like Jesus Christ, err, Steve Jobs.

Beau, you'd be great there in the Sheryl Sanberg role.


NOOOOOO!!!!!! I am NOT going to take a job. Period! I'm going to WIN at this "retirement thing" even if it kills me. :)

Actually, I have been lurking around Tesla ever since they were founded. I drove every single mule they built and ever single model they had before launch. I've turned down investing in them at least 5 times. The last time was probably a mistake. They'd been recapitalized and they were about to really blow out sales. But, I just could NOT get comfortable with either the initial founding team or with Elon. As you all know, I love the product. But the risk profile of the business has been (and probably still is) absurdly high. Once they got public and the stock price shot up, I knew there was no way I'd ever own any of the stock. That said, our extended family is now up to Tesla cars. We all love the product but will not own the stock.

Ah me.... if only they could get a real operations person in there, who was about 20 years younger than me, to run things while Elon launches cars into the sun and argues about boring holes through LA. ah well.....
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Re: Electric Car Prediction - Whatdayathing???

Postby BeauV » Tue Aug 21, 2018 8:40 pm

A blogger got a tour of the Tesla Model S & X production lines in THIS video. It's interesting to hear Elon talking about the process and way various bits of the manufacturing line works.
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Re: Electric Car Prediction - Whatdayathing???

Postby TheOffice » Fri Aug 24, 2018 1:48 pm

“If a man must be obsessed by something,” E.B. White once wrote, “I suppose a boat is as good as anything, perhaps a bit better than most.”

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Re: Electric Car Prediction - Whatdayathing???

Postby kdh » Fri Aug 24, 2018 4:24 pm

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