Go Back   EcoModder Forum > Introductions
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-13-2010, 09:35 AM   #11 (permalink)
EcoModding Lurker
 
CarlosP's Avatar
 
Join Date: May 2009
Location: PR
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Excellent build.. More or less what I'm looking to build..

Ironically I was looking at some 72v motors a couple of days ago, but they were golf cart engines.. But I'm not sure if they would be powerful enough for a build like this. They were rated about 4-5hp and around 4,200rpm.

What specs would be the best to look for in a 72v motor, as in torque, hp rpm?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-15-2010, 01:37 PM   #12 (permalink)
24.27 lbs per gallon Co2
 
Oval_Overload's Avatar
 
Join Date: Aug 2008
Location: Minneapolis, MN
Posts: 217

Unicorn - '12 Nissan Versa 1.8S hatch
90 day: 31.9 mpg (US)
Thanks: 8
Thanked 13 Times in 10 Posts
20 HP, 40 hp peak seems to be a common number. Don't worry much about torque. Any electric motor you find will have fistfulls more torque than the three pot engine that you pulled out. Besides, you have 5 gear ratios to choose from. Before you go out buying ****, think about the future. 72 volts is a very low system voltage... Solectria's are 144 volts, Tesla is like 320 volts. I worked on a gel lead-acid/WarP car that ran at 177 volts...
You may want to upgrade at some point!

The lowest voltage component in your system is what will hold you back. You are building a 72 volt car, but you may want to spend a wee bit more for a 96 volt charger (Delta Q makes a nice one), 96 volt contractors, 96 volt shunt, 96 volt fuses, etc...

Going overkill on the component rated voltage will make voltage upgrades easier. Say you are not satisfied with the car's performance, if your components are appropriately sized, you just pop another battery in and away you go! Also, using a higher system voltage will yield the same performance from smaller, lighter wiring, while drawing fewer amps and getting more range.

Just something for you to chew on

~Jimbo

P.S. Could the mods move this to the FFF forum?
__________________


Quote:
Hehehe... If one of your facial lacerations leaves a small scar, you'll have a SCarlett.
  Reply With Quote
Old 01-17-2010, 09:38 PM   #13 (permalink)
EcoModding Lurker
 
CarlosP's Avatar
 
Join Date: May 2009
Location: PR
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Yes, I would be a good idea to spend a little more on better chargers, etc.. in case of a future upgrades. Although, a setup of 144volts or more is going to be too costly. It would definitely be a a far better choice.

If I could over volt to 96v, I think it might be enough for daily commute. I don't think a car this small is going to handle so many batteries as to accommodate a 144v system, and a 320v is even further off.

Yes, this thread went from introduction, to technical.. should be moved.
  Reply With Quote
Old 01-17-2010, 09:41 PM   #14 (permalink)
EcoModding Lurker
 
CarlosP's Avatar
 
Join Date: May 2009
Location: PR
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
I found some pretty good books online, with conversion charts, formulas etc.. I think they might help a lot of beginners like me, and probably some experienced people too.

I'll see if I can post them on the forum..
  Reply With Quote
Old 01-18-2010, 09:19 AM   #15 (permalink)
24.27 lbs per gallon Co2
 
Oval_Overload's Avatar
 
Join Date: Aug 2008
Location: Minneapolis, MN
Posts: 217

Unicorn - '12 Nissan Versa 1.8S hatch
90 day: 31.9 mpg (US)
Thanks: 8
Thanked 13 Times in 10 Posts
For your needs, I think you'll be more than happy at 96 volts. You probably want to connect with other electric Geo owners to discuss suspension and weight distribution.

I probably should read those books :P

May I ask you what we are dealing with financially? What components would you like to buy new and what would you prefer used? This way I can give you a heads up if I happen across a suitable part.

Carlos, are you going to build Paul's controller?
__________________


Quote:
Hehehe... If one of your facial lacerations leaves a small scar, you'll have a SCarlett.
  Reply With Quote
Old 01-21-2010, 02:54 AM   #16 (permalink)
24.27 lbs per gallon Co2
 
Oval_Overload's Avatar
 
Join Date: Aug 2008
Location: Minneapolis, MN
Posts: 217

Unicorn - '12 Nissan Versa 1.8S hatch
90 day: 31.9 mpg (US)
Thanks: 8
Thanked 13 Times in 10 Posts
Carlos, come out come out wherever you are

__________________


Quote:
Hehehe... If one of your facial lacerations leaves a small scar, you'll have a SCarlett.
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chris' Electric Motorcycle Build Thread bennelson Motorcycles / Scooters 75 01-11-2016 01:47 PM
Electric car conversion: Project ForkenSwift MetroMPG Fossil Fuel Free 1041 07-28-2014 09:19 AM
Electric Cars Push Japan Engine Parts Makers to Crisis Mode tjts1 The Lounge 14 12-23-2012 12:47 PM
How to Build an Electric Car DVDs for sale! bennelson Fossil Fuel Free 52 01-10-2011 01:52 PM
100 mile range Ranger EV? Frank Lee Fossil Fuel Free 10 08-05-2010 12:09 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com