Electric conversion: Project ForkenSwiift - Page 83 - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 10-16-2007, 04:55 PM   #821
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
For comparison: Tesla recenty did the EPA test cycles for the roadster. In city driving, it's rated for 300 wh/mile (also based on energy usage at the charger).

http://www.teslamotors.com/blog4/


VP1 undergoes range testing on the dynamometer
__________________

MetroMPG is offline   Reply With Quote
Old 10-16-2007, 06:37 PM   #822
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
127 wh/mile doesn't seem too awful by comparison to 300. It would be like a 20mpg car compared to a 45mpg car, sort of.

Very cool all the same, the forken that is. Do you think the tesla can be hyperwatted? 10kwh/day seems a bit much. Is it as simple as crawling to minimize battery losses?
__________________

__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 10-16-2007, 06:44 PM   #823
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
The Tesla is undoubtedly far more efficient battery-to-wheels
MetroMPG is offline   Reply With Quote
Old 10-16-2007, 06:53 PM   #824
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
No more fiddling with spreasheets past my bed time.
MetroMPG is offline   Reply With Quote
Old 10-16-2007, 07:09 PM   #825
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Haha, wow! That's a pretty big oops right there...

At least your still on par with the professionals...
SVOboy is offline   Reply With Quote
Old 10-16-2007, 07:24 PM   #826
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Quote:
Originally Posted by MetroMPG View Post
FS is 331 wh/mi, not 127.

Drat, Tesla wins, even with me driving 20 km/h.

No more fiddling with spreasheets past my bed time.
If ya had li-ions you'd be at 231Wh/mile and given that the Tesla's charger is such a hog, they're likely more than 127Wh/mile from the plug. Just sayin...

Here's some more from GCC
Quote:
Henrik,

Click "Where the Rubber Meets the Road" above and scroll down to the section on Range Testing. They show recharge energy of 31 kWh/100 miles for combined cycle. That's at the wall plug, not the battery. As you note, the car only needs a little over 200 Wh/mile from the battery. This means 1/3rd of the wall plug energy is lost in the charging process. Tesla's well-to-wheel white papers claim 90 or 95% charging efficiency instead of the 65-70% implied by this data. That's a huge gap.

Ok I get it. That is an interesting observation. Wonder what went wrong. Lithium batteries should have very high charging efficiency near 100% according to http://www.batteryuniversity.com/partone-12.htm. So the problem must be the charging transformer. As far as I remember they often lose a lot of energy possibly 30% but it is possible to buy some that loose very little energy. Maybe they have chosen a model that is cheaper and perhaps lighter but that waste more energy in the conversion. Most people will never notice such a change anyway but you do. Plus electricity is still very cheap compared to gasoline so the economics is still ok and the people that can afford a Tesla will not care about the economics of driving anyway.

Remember that the EPA tests that tesla ran now include running the air conditioner. The california sun beating down through the windows, and on a dark green roof will require alot of air conditioner power to keep temperate. That could explaine alot of the difference between the 216 WH/mile that they got when actually commuting (probably with the top down), and the 310 WH/mile they got while running the EPA designed tests (top up, air on).

Coalburner, the problem with your theory is they show 245 mile range on the combined test.Even if they used all 53 kWh in the battery pack that only comes out to 216 Wh/mile. The diff between 310 and 216 is apparently charging efficiency. It's a really horrible result, hopefully caused by a really inefficient non-production charger. If not Tesla needs to completely re-do their well-to-wheels white papers.

Update, Tesla deleted my question but in response to another message said the difference between 216 and 310 Wh/mile was due to charging inefficiency, including the need to run a cooling system to keep the batteries cool during charging!

Somehow I doubt they'll update their well-to-wheels paper or stop making their ridiculous "penny per mile" claims. Tesla is doing good work but there's no shortage of snake oil, either.
Meh?
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 10-17-2007, 11:20 AM   #827
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Good diggin', omg. Thanks for posting that.
MetroMPG is offline   Reply With Quote
Old 10-17-2007, 11:22 AM   #828
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Better not slow down unless you REALLY need too,
SVOboy is offline   Reply With Quote
Old 10-17-2007, 03:15 PM   #829
Tuggin at the surly bonds
 
Silveredwings's Avatar
 
Join Date: Apr 2006
Posts: 839
Country: United States
Blistering!
__________________
Reality is merely an illusion, albeit a very persistent one. - Albert Einstein
Silveredwings is offline   Reply With Quote
Old 10-17-2007, 05:16 PM   #830
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Blistering indeed.
__________________

MetroMPG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 08:59 PM
Combined totals of all my vehicles? nizationpcs Fuelly Web Support and Community News 0 03-30-2009 06:41 AM
Vehicle Notes pb Fuelly Web Support and Community News 4 10-08-2008 11:38 AM
Converting numeric to current tire sizes. omgwtfbyobbq General Maintenance and Repair 5 06-01-2007 04:51 AM
Prius. First Impressions zpiloto General Fuel Topics 17 09-03-2006 10:49 PM

» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 02:00 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.