Electric conversion: Project ForkenSwiift - Page 80 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 10-11-2007, 03:12 PM   #791
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
Very cool, can't wait for some real world stats (0-30 times, top speed, range, etc).

So where is the garage entry already?

P.S. what is downshifting like without a clutch (spinning the motor up on the synchros?) or do you not do much shifting or hows that work?
__________________

__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 10-11-2007, 07:35 PM   #792
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Right... garage entry! I should get on that.

What formula will I use for MPG equivalent though? There are 33,557 watt hours in a gallon of gas, and the FS pack theoretically (when new) holds 48v*220AH (I think) = 10,560 watt hours (less than 1/3 of a gallon of gas, equivalent energy!)

Problem is, I don't have a killawatt meter, so I don't know exactly how much I'm putting back into the pack when I recharge. Suggestions? I can estimate SOC from pack voltage... but that's kind of like estimating MPG based on where you gas gauge was before topping up.
__________________

MetroMPG is offline   Reply With Quote
Old 10-11-2007, 07:41 PM   #793
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Whoops missed this:

Quote:
Originally Posted by skewbe View Post
P.S. what is downshifting like without a clutch (spinning the motor up on the synchros?) or do you not do much shifting or hows that work?
MetroMPG is offline   Reply With Quote
Old 10-11-2007, 08:43 PM   #794
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
I gotcha on the shifting.

re monitoring efficiency: I had this whole DIY Kill-a-Watt thing typed out, then went to ebay and searched for "Kill A Watt" and the dang things are $22 shipped, LOL. 15 amps max, don't know what a car charger needs.
__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 10-11-2007, 08:48 PM   #795
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Hrm. One of the chargers is 20A, the other is 5A. So if I feel like waiting 24h to recharge the car using the 5A unit, I could measure it.

EDIT: wait a minute... it charges at 20A DC. 110v AC amperage will be less.

I should get a killawatt anyway...
MetroMPG is offline   Reply With Quote
Old 10-11-2007, 08:53 PM   #796
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Get it, sucka!
SVOboy is offline   Reply With Quote
Old 10-11-2007, 08:57 PM   #797
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Otay, Panky!
MetroMPG is offline   Reply With Quote
Old 10-11-2007, 09:08 PM   #798
Registered Member
 
trebuchet03's Avatar
 
Join Date: Mar 2007
Posts: 812
Country: United States
Send a message via AIM to trebuchet03
Quote:
Originally Posted by MetroMPG View Post
Right... garage entry! I should get on that.

What formula will I use for MPG equivalent though? There are 33,557 watt hours in a gallon of gas, and the FS pack theoretically (when new) holds 48v*220AH (I think) = 10,560 watt hours (less than 1/3 of a gallon of gas, equivalent energy!)

Problem is, I don't have a killawatt meter, so I don't know exactly how much I'm putting back into the pack when I recharge. Suggestions? I can estimate SOC from pack voltage... but that's kind of like estimating MPG based on where you gas gauge was before topping up.

If you don't have a killawatt or other way to measure current draw.... Turn off/unplug everything in your house except for your charger and check out the power meter -- measure how much power it's using....

Hrmm... that only works if you know how long the charger is running....
------
Do those cheap multimeters do AC current for any appreciable current?

-----
As for gas equivalent....see if you can figure out how wrightspeed calculated the equivalent mpg - his EV gets 170mpg eq.
http://www.wrightspeed.com/

Doing a google search yields all sorts of results.... Some are based on energy content, others are on emissions equivalent...

From the wiki entry on battery EV's -- but that section is tagged as not having a source
Quote:
BEV operating costs can be directly compared to the equivalent operating costs of a gasoline-powered vehicle. A gallon of gasoline contains about 36.4 kWh of energy. To calculate the cost of the electrical equivalent of a gallon of gasoline, multiply the utility cost per kWh by 36.4. To calculate the equivalent mileage of a BEV, divide 36.4 kWh/gal by the energy efficiency in kWh/mile, to get the equivalent miles per gallon. For example, if a BEV owner's electricity rate is $0.10 per kWh, and the BEV gets 0.20 kWh/mile, then the owner is paying the equivalent of $3.64 per gallon of gasoline, and getting the equivalent of 182 miles per gallon.


Yet again, another post that looks like I'm playing darts... I'm all over the place
__________________
Time is the best teacher. Unfortunately it kills all its students.


Bike Miles (Begin Aug. 20 - '07): ~433.2 miles

11/12
trebuchet03 is offline   Reply With Quote
Old 10-12-2007, 03:15 PM   #799
Registered Member
 
Join Date: Oct 2005
Posts: 1,978
Country: United States
Congrats! ...really glad to hear that it worked out.

RH77
__________________
rh77 is offline   Reply With Quote
Old 10-12-2007, 05:05 PM   #800
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Thanks, Rick!

---
__________________

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 09:59 PM
Combined totals of all my vehicles? nizationpcs Fuelly Web Support and Community News 0 03-30-2009 07:41 AM
Vehicle Notes pb Fuelly Web Support and Community News 4 10-08-2008 12:38 PM
Converting numeric to current tire sizes. omgwtfbyobbq General Maintenance and Repair 5 06-01-2007 05:51 AM
Prius. First Impressions zpiloto General Fuel Topics 17 09-03-2006 11:49 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:04 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.