<<  <  Page 3/6  >  >>
User Rank
To many electric things
wheely   11/3/2011 4:34:18 PM

User Rank
Re: Electric vehicles
BudM   11/3/2011 4:02:46 PM
Well, to make solar panel, wind turbine they will have carbon foot print since you need factories and resoureces to make things. There is no real carbon foot print free, when things are needed to be manufactured.

User Rank
Re: Volt = Short Term
gafisher   11/3/2011 3:54:21 PM
"We, as example, have family thousand or more miles from here.  Visiting them every few years ..."


That's not your only point, of course, but it wouldn't make sense either to buy or to forego a particular model based on such an occasional need.  Far better to buy what works best for everyday use and rent for the unusual trips -- it's not expensive, and lets you optimize your investment (and save some wear and tear on the personal vehicle).  Of course mass transit may also be an option depending on your location.

User Rank
Getting around the Hype - Positive and Negative
diskguy   11/3/2011 2:38:16 PM
I'm trained as a nuclear engineer but have worked on disk drive technology for the past 25 years waiting for the FUD around nuclear energy to be corrected but that's another story.  I bought a LEAF and have been driving one since May 2011 and have made all but 4 of my trips in the LEAF.  Since there are 4 drivers in my family, an ICE car for longer trips is always available for those times when the LEAF was not suitable for the range (4% mileage and less than 1% of the trips). I think the economics of hanging onto an extra ICE car for range extension doesn't make much sense when you can rent an ICE for much less money.

I read all the comments and I'm saddened to see so much wrong information.  In particular the toxic battery comments, the energy efficiency of powerplants vs ICE, and the range question. The primary reason I went with electric is the reliability of electric motors and wanting a first hand experience with how well the battery will last. Since I keep my ICE vehicles for 15+ years I am planning to keep the EV for a long time as well and expect to replace the battery. So what will become of the battery that's removed?  The current LEAF battery is expected to have 70 to 80 percent of it's 24 KWHr capacity after 8yrs/100K miles and there is some interest in using the 20KWHr 'used' battery for energy storage. So instead of thinking of these batteries as needing to be disposed, they really have a secondary use for energy storage. 

There are many ways to look at the economics of EV vehicles and while the thermodynamic efficiency of a LEAF is somewhere between 30 and 40 MPG the source of fuel is much more robust. I am no fan of transmission of electricity for hundreds of miles but the US national loss in transmission is only 7% and the source can be coal, natural gas, nuclear, hydro, geothermal or pick your favorite renewable. The infrastructure to charge EVs at night is sufficient to supply 70% of our transportation needs for cars and light trucks (Pacific Northwest DOE Report).

The main reason I went with an EV is for energy independence with a strong desire to make things simple and more reliable. I encourage you to study EV's and don't listen to all the fear. Finally, don't race an EV - the hole shot with full torque on an EV will set all ICE at a disadvantage. Google "White Zombie Electric" to see a street legal 1/4 mile -- 125MPH@10.4Sec vehicle.

APG3 inventer
User Rank
Re: Volt = Short Term
APG3 inventer   11/3/2011 2:27:52 PM
The way I see the volt is as a car that can operate only on a battery, to/from work or the store or the church.  It is a reasonable run time car.  The Gasoline is used when power fails (e.g. North East now) or when the owener needs to take a road trip for vacation or simply to friends / family.  It extends the range while charging.  The Volt is the type of car that is needed. 

The leaf is more only a short distance sprinter.  Once there, plug me in (oh no public plugs ? - charge my battery before I go home...  Or with luck a short range to / from and not much more.  Charge at home.  Maybe charge at work - would you pay to charge your friends cars if they came over for dinner ?  With a Electric Grid and home batteries - yes.  Without - maybe not.

We, as example, have family thousand or more miles from here.  Visiting them every few years would be ok in the Volt.  It would be impossible in the Leaf.  The Leaf was designed for society and lifestyle unlike our society.  If we all lived in the same home town and worked there. (Utopia ?) We would be able to scoot about and be close to our lives.  Since we are not like that we need a little more range.

The Leaf would be good for small towns and for those that don't go anywhere but Church and the store for food.  It might be a good second car to a family to take kids to the school, home to charge, store, home to charge, back to school, home to charge and then whatever.  Maybe excessive charging, but after schook some like to go shopping or buy a coke...  more miles added.

I think of the Volt as an everyday car while another might be for trips.  But that means I have to own and pay for two cars.  The Volt helps keep me from buying that second car.


User Rank
Re: I wouldn't buy either
jimwilliams57   11/3/2011 2:11:10 PM
jimwilliams57: Environmentally, battery power isn't any better, and may even be worse, than gasoline or diesel.

JRoque: Source for this statement, please?

Amount of CO2 emissions for electric vs. gasoline...

Volt can travel up to 50 miles on a single charge of 16 kWh battery - http://gm-volt.com/full-specifications/

In the US, in 1999 electricity generators emitted an average of 1.341 lbs of CO2 per kWh - ftp://ftp.eia.doe.gov/environment/co2emiss00.pdf

Electricity transmission & delivery is approximately 93% efficient. - http://www04.abb.com/global/seitp/seitp202.nsf/c71c66c1f02e6575c125711f004660e6/64cee3203250d1b7c12572c8003b2b48/$FILE/Energy+efficiency+in+the+power+grid.pdf

This means 17.2 kWh must be generated in order to deliver 16 kWh to the battery charger.  I will ignore losses in the charging process.

17.2 kWh produces 23.065 lbs of CO2.  Thus, 23.065 lbs per 50 miles, or .461 lbs per mile.

The Volt is said to get 36 MPG highway in extended range mode - http://gm-volt.com/2010/10/10/popular-mechanics-finds-chevrolet-volt-gets-32-mpg-city-and-36-mpg-highway-in-extended-range-mode/

Gasoline contains 2421 grams (5.337 lbs) of carbon - http://www.epa.gov/otaq/climate/420f05001.htm

Assuming all carbon is converted to CO2, 5.337 lbs carbon will result in 19.747 lbs CO2 - http://www.fueleconomy.gov/feg/co2.shtml

That is 19.747 lbs of CO2 per 36 miles, or .548 lbs per mile.

Recap: Gasoline produces .548 lbs per mile while electricity produces .461 lbs per mile.

I stand corrected.

User Rank
Re: Electric vehicles
nicart56   11/3/2011 2:08:00 PM
There's no time right now to think or debate about these things. We have to turn it around now. Wehave to all work to Together to overcome pollutin. If it means a wind turbine then we do it! If you have the sun you use it! They subsidise the Fat Pig Oil companies that have just made trillions in profits but they can;t subsidise the citizens of America whose money this really is. It'snot a Moot Point! And if you make enough of them the price comes down on everything involved. Oxygen levels have been greatly reduced over the past 50 years-Look it up on Google?

User Rank
Re: Leaf or Volt
Absalom   11/3/2011 2:04:23 PM
Toolmaker I know what you mean. My daughter thinks the sky is falling and that recycling stuff and riding a bike is what she can do to fix it. I'm sure she hates it when I light up the rear tire on my motorcyle when leaving the driveway.

User Rank
Volt = Short Term
mr88cet   11/3/2011 1:50:48 PM
I personally think that the Volt is a good short-term solution, but that it's ultimately going to prove too expensive.  The reason is simple:  It requires an electric system with enough power to drive the whole car, and also a gasoline engine with enough power to drive the whole car. 

On contrast, the Prius is a "real" hybrid, in that it shoots for, very approximately speaking, half of its power profile on the electric side and the other half on the gasoline side.  The result then is that it can't operate for very long entirely on one power source or on the other. 

The Volt's goal is to provide a significant pure-electric range with gasoline backup.  The Leaf's goal is to provide an even more significant pure-electric range with out any backup. The Prius makes no goal at all of pure-electric driving;  its goal is just to make the most efficient second-by-second simultaneous use of both power sources, in combination with each other.

sensor pro
User Rank
Re: The real cost of gas.
sensor pro   11/3/2011 1:35:54 PM
Good point. When looking on cost comparisson, we need to dig deeper and see what we are really paying per gallon. That would be a more fair comparisson.

<<  <  Page 3/6  >  >>

Partner Zone
Latest Analysis
The term “autopilot” is now at the heart of a growing debate between Tesla Motors Inc. and Germany’s Federal Motor Transport Authority.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Highly regarded engineer and physicist Ransom Stephens speaks with Design News about his extensive science and engineering background, the serious yet funny study of neuroscience, and how one primes their brain for innovation.
It's your turn to cast your vote for one of these 12 finalists to win the ARM TechCon Reader's Choice Award for the most innovative product of the past year.
While supercapacitors and rechargeable Lithium-ion batteries both store energy, these two technologies are very different in their design and in their performance capabilities.
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 10 - 14, Embedded System Design Techniques™: Getting Started Developing Professional Embedded Software
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10

Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Course September 27-29:
Sponsored by 3M
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service