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Captain Hybrid
Slideshow: High-Voltage Hybrids & EVs
8/1/2013

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In 2009, electric dragracer Mike Willmon placed two parallel strings of 30 lead-acid batteries in his makeshift 'Crazyhorse' electric Pinto back. The 848-lb battery pack delivered 360V and 1,600A of current. Theoretically, the vehicle generated 576,000W of power.   (Source: Mike Willmon)
In 2009, electric dragracer Mike Willmon placed two parallel strings of 30 lead-acid batteries in his makeshift “Crazyhorse” electric Pinto back. The 848-lb battery pack delivered 360V and 1,600A of current. Theoretically, the vehicle generated 576,000W of power.
(Source: Mike Willmon)

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naperlou
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Let's evolve
naperlou   8/1/2013 10:24:03 AM
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Cap'n, this is an interesting trend.  The 48V systems are an interesting bridge.  As more functions are powered by electricity provided by batteries, the load on the engine is lessened.  This allows smaller (more fuel efficient) engines to power the vehicle.  Charging the batteries using regenerative braking captures energy that was unused before.  Thanks for the article.

TJ McDermott
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DC Bus Voltage
TJ McDermott   8/1/2013 11:03:28 AM
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The voltages noted in the article match the DC bus voltage one would find in an industrial Variable Frequency Drive.  Using just the converter portion of such a drive would permit the use of regular 220V AC motors on the 300-360 voltages, and 460V AC motors for those in the 650V bus range.

Rob Spiegel
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Re: Let's evolve
Rob Spiegel   8/1/2013 11:04:33 AM
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Hey Chuck, how does the greater voltage affect how long the car can go before it needs to switch to a fuel motor?

Charles Murray
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Re: Let's evolve
Charles Murray   8/1/2013 6:44:44 PM
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Essentially, Rob, you're asking how much more all-electric range can you get by employing a higher-voltage architecture? Higher-voltage architectures and higher-voltage batteries are in general better at capturing regenerative braking energy, which does get you some extra electric range. But putting a number on it is going to be tough. I'll try to get a rough estimate for you, but it will vary from vehicle to vehicle, since they have different electrical architectures. Great question.

Charles Murray
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Re: DC Bus Voltage
Charles Murray   8/1/2013 7:37:10 PM
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Thanks for that info, TJ. A few years ago, we wrote about how EV drag racers first tried to use smaller motors and lower voltages, and how they evolved. You might enjoy it:

http://www.designnews.com/document.asp?doc_id=228440

AREV
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Gold
Re: DC Bus Voltage
AREV   8/2/2013 1:54:44 PM
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This articel sounds like the cubic inch battles of the 60s.(Watch the disney movie Dumbo from the 40s and watch the drunk clown scene.) Sunco was kept in business since the Covettes required the 260 blend . . . . I lost count of the volatge on thedifferent cars. This means that battery makers cannot standardize. I'd like discussion on the safety factor. I have hears or the Pintos w/ fork truck batteriies having a short and the entire car tourched in seconds from a short(wrench dropped). Are we going to wait until one death from these vehicle w/ no concern to isolate the power from the rest of the vehicle? With this much electrical power they may be the next vehicle of choise for terrorists. Just like bigger planes became bombs on 9-11. Less weight. Less power. More safety.

 

MVRS
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Iron
Re: DC Bus Voltage
MVRS   8/2/2013 2:22:40 PM
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Why do you say that the high voltage is not isolated from the rest of the vehicle?  I would imagine that it is.  These cars do not use 300+ volts to power the radio, headlights, etc.

MVRS
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Iron
42V
MVRS   8/2/2013 2:34:39 PM
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Remember the 42V push back about 15 years ago?  Replace the 12V battery with 42V and the wiring would be smaller (and thus lighter), there would be less voltage drop due to lower currents, and electric motors could be used for some things that were now belt driven on a n engine (power steering, AC, etc).  Some electronics started to be developed to support the higher bus voltage.  They ran into some issues with switches not lasting due to longer arcing when opening, too close of a margin to the 60V shock safety limit, off-state leakage current (increased), and incandescent bulb filiments durability.

Some of those problems are less of an issue now with switch mode converters and LED lighting.

AREV
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Re: DC Bus Voltage
AREV   8/2/2013 2:53:50 PM
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By isolate I mean that in cases of accidents the battery is totaly disconnected from everything so the power cannot escape to start a fire or electrocute someone. Same way an air bag inflatestoday the batteries should be totally separated from the vehicle on a detedted impact. Or they flare up like palnes are experiancing.

Charles Murray
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Re: 42V
Charles Murray   8/2/2013 7:06:37 PM
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Good point, MVRS. One of the advantages of the proposed 48V systems is that they would keep a 12V network, so that suppliers wouldn't have to develop new compatible products (as they would have during the days of the proposed 42V systems). Let's hope we soon see that on our micro-hybrids.   

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