Adding Extra EV battery - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 09-06-2007, 06:00 PM   #1
Registered Member
 
billynjoanna's Avatar
 
Join Date: Jun 2007
Posts: 23
Country: United States
Question Adding Extra EV battery

I was wondering if I was to add a second EV battery would that let me run on electric motor twice as long?
__________________

__________________
He who lives the longest WINS!
billynjoanna is offline   Reply With Quote
Old 09-06-2007, 06:27 PM   #2
Registered Member
 
Join Date: Aug 2007
Posts: 313
Country: United States
Only if you hook it up in parallel... ;-)
__________________

__________________
2TonJellyBean is offline   Reply With Quote
Old 09-06-2007, 07:22 PM   #3
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
There was a guy who did something like that. Last I heard, he was using lead-acid batteries, but that was about 4 years ago. I think his name was Wayne, but I'm not sure.
__________________
Bill in Houston is offline   Reply With Quote
Old 09-06-2007, 07:57 PM   #4
Registered Member
 
GasSavers_Ryland's Avatar
 
Join Date: Mar 2006
Posts: 1,325
Country: United States
Send a message via AIM to GasSavers_Ryland
yes, on an EV, if you add more batteries you can run the motor longer, you want to keep the voltage the same, but make the amp hours of the pack more, you do this by hooking it up in parallel, you of course want to use batteries that are of a simaler age, construction, and if you can the same brand is nice, this helps to keep the batteries equal as they charge and discharge.
if you have a hybrid car, you can also add more batteries, but often the hybrids computer will need modifications to alow it to make use of the new battery, as it keeps track of the discharge and is designed to prevent over discharge.
Most EV's are pretty flexable when it comes to batteries, it is commen to simply have a large space with strong frames to suport your banks of lead acid batteries, if you want to use a differnt style of battery, simply make sure they will physicaly fit, then weld up another frame to suport this new size of battery, but the best thing in my mind is to upgrade the type of batteries used from lead acid (cheap to buy, durable, short life span) with NiCads, or NiMH batteries of course they are going to dubble or triple the cost of your battery pack, and lithium batteries seem to start at about 5 times that of lead acid, but the more you spend the less space, and the lighter they are, so the longer you can drive on a charge.
GasSavers_Ryland is offline   Reply With Quote
Old 09-07-2007, 05:08 AM   #5
Registered Member
 
billynjoanna's Avatar
 
Join Date: Jun 2007
Posts: 23
Country: United States
adding batteries

I was looking on ebay and found some used EV batteries($375) out of 2006 prius. I thought that if I hooked them up to what I had it would give me twice the time on the electric motor. But, if I read some of your post right I can use regular lead batteries also. Is this right?
__________________
He who lives the longest WINS!
billynjoanna is offline   Reply With Quote
Old 09-07-2007, 06:42 AM   #6
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
You gotta find the guy who did the work on the Prius. He was a genius. The kind of guy who has his own patents and such. By now he may be working with an installer to do conversions, or something like that. It's not like you can just get 288 volts worth of batteries and hook 'em up and it all works fine.
__________________
Bill in Houston is offline   Reply With Quote
Old 09-07-2007, 06:45 AM   #7
Registered Member
 
Rick Rae's Avatar
 
Join Date: Jun 2007
Posts: 240
Country: United States
Ryland did a great job of covering the question. Since you've said "twice" twice though let me just add that doubling your battery pack size probably won't quite double your range. If you were just running an electric motor with no load, yes. But the motor you're running has to move those batteries, so as you add more of them the weight goes up and you get a "diminishing returns" situation.

How much you fall short will depend on things like the ratio of battery weight to total loaded vehicle weight, and the shortfall may be so small you don't even notice it, but it should be there.

This is just an off-the cuff thought, but maybe: Find out what a second battery pack weighs. Load that much weight into your vehicle. Drive it and determine the range/time with that load. Double that value and that might represent what you'd get with the second battery pack, presuming the condition of both packs are identical. (Anyone see a fault in that thinking? I didn't ponder it long so I don't have a lot of confidence in it.)

Of course if you go with lighter or higher-energy-density batteries, all bets are off.

Not quite making "twice" aside, I like that you're thinking along these lines. The more of us pondering creative approaches to FE, the better the chances everyone will benefit.

Rick
__________________
Rick Rae is offline   Reply With Quote
Old 09-07-2007, 06:54 AM   #8
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
http://privatenrg.com/PriusBattery.htm
__________________

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
Fuelly for Maintenance? brandonrossl Fuelly Web Support and Community News 11 01-05-2009 04:09 AM
Feature Request: City vs Highway jethrographic Fuelly Web Support and Community News 1 08-08-2008 10:43 AM
MPFI Swap parts list UfoTofU General Maintenance and Repair 3 09-21-2006 04:24 PM
hi SuperRobot46000 Introduce Yourself - New member Welcome 6 07-15-2006 07:44 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 09:47 PM.


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