ADVrider

Go Back   ADVrider > Bikes > Some Assembly Required
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-27-2011, 05:45 PM   #1
Luke OP
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,074
Electric trail bike



I'm just getting started, but here's what I have. An electric trail bike based on a '99 YZ125. Everything is assembled, wired, and running. It needs a lot more work to get it into a useful state. I don't have much to show right now, but I'll get some pictures of the components and go into what it took to get to where it is now.

Until I figure out embedding vimeo videos; http://www.vimeo.com/26986399

Luke screwed with this post 07-27-2011 at 06:03 PM
Luke is offline   Reply With Quote
Old 07-27-2011, 06:22 PM   #2
alphaBETAdog
Gnarly Adventurer
 
alphaBETAdog's Avatar
 
Joined: Feb 2011
Location: Central Arizona
Oddometer: 273
Excellent Luke! Keep pluggin away (pun intended)!
__________________
'13 Suzuki Vstrom 650
'08 Beta 450 RS
'12 Kymco Gti300, '03 Aprilia Scarabeo 150
alphaBETAdog is offline   Reply With Quote
Old 07-27-2011, 06:37 PM   #3
DaveRMS
Beastly Adventurer
 
DaveRMS's Avatar
 
Joined: Jul 2005
Location: San Rafael, CA
Oddometer: 1,054
Awesome Luke!!!
DaveRMS is offline   Reply With Quote
Old 07-27-2011, 06:41 PM   #4
oregoncoast
Racing Like a Noob
 
oregoncoast's Avatar
 
Joined: May 2007
Location: Duh!
Oddometer: 4,416
Luke is da man. Where's that link to the video of it running though???
oregoncoast is offline   Reply With Quote
Old 07-27-2011, 06:44 PM   #5
Luke OP
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,074
Quote:
Originally Posted by oregoncoast View Post
Luke is da man. Where's that link to the video of it running though???
Right at the bottom of the post.

It embeds perfectly in the 'test your embed video' thread, but not here. Go figure.

Here, I'll try again:




Edit again: One message to the mods and it works! Embedding wasn't turned on for this forum yet. Thanks Johnjen!

Luke screwed with this post 07-27-2011 at 08:27 PM
Luke is offline   Reply With Quote
Old 07-27-2011, 06:47 PM   #6
oregoncoast
Racing Like a Noob
 
oregoncoast's Avatar
 
Joined: May 2007
Location: Duh!
Oddometer: 4,416
Yep. I could not get it to work here either...lol.
oregoncoast is offline   Reply With Quote
Old 07-27-2011, 06:50 PM   #7
Zachsv
SVhaver
 
Zachsv's Avatar
 
Joined: Sep 2010
Location: Wilmington, NC
Oddometer: 156
I hope you get it worked out right! I would love to have an electric dirtbike capable of a couple hours of medium riding. Would be amazing to tear through some woods w/o bothering the houses that are near.
Zachsv is offline   Reply With Quote
Old 07-27-2011, 07:40 PM   #8
OaklandStrom
Beastly Adventurer
 
Joined: Sep 2005
Location: East Bay
Oddometer: 1,612
Cool project!


Just out of curiosity, exactly which city in Oregon is idiotville? I think there's more than one possibility. My vote is for Springfield.
OaklandStrom is offline   Reply With Quote
Old 07-27-2011, 09:10 PM   #9
Luke OP
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,074
So I have a few goals for this bike. They may be modest, but they're goals.

1: Built like a real woods bike. I'm basing this on a full sized bike's chassis, and it needs to not weigh much more than the original bike. The YZ has a claimed weight of around 210 pounds, I didn't check the actual weight before stripping it and I'd like it to end up the same after conversion, but I figure if I keep the weight under 250# that'll be good enough. That's the weight of a modern 250 4 stroke. I'd prefer lighter (sub 225#) but we'll see what I get.

2: Good performance. It needs nice smooth power delivery, especially since there is no clutch to mask any thottle issues. It also needs to wheeley. Top speed should be good enough for local trails, which is around 25 mph.

3: 10 miles of range. That's not much, but if it can be recharged quickly and/or have swappable battery packs then that's good enough for around here. My trials bike has about a 20 mile range and that's enough for a good multi-hour trail ride.
Luke is offline   Reply With Quote
Old 07-27-2011, 09:27 PM   #10
Luke OP
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,074
Quote:
Originally Posted by OaklandStrom View Post
Cool project!


Just out of curiosity, exactly which city in Oregon is idiotville? I think there's more than one possibility. My vote is for Springfield.
Thanks!


No, it's not Springfield. With all respect due our beloved Springfield ADVer's, that's a pretty good guess though.

I actually live in Beaverton; Idiotville is an old logging camp in the coast range where I usually go trail riding. http://en.wikipedia.org/wiki/Idiotville,_Oregon. Surprise, it's a real place.
Luke is offline   Reply With Quote
Old 07-27-2011, 10:44 PM   #11
Luke OP
GPoET&P
 
Luke's Avatar
 
Joined: Aug 2004
Location: Idiotville, OR
Oddometer: 4,074
Anyway, since I have some pictures of them, let's start with the batteries.

There are a zillion different kinds available. It turns out, though, that only one type will deliver the sort of power* that I want. They are a lithium cell made by A123. They're the same one used in the electric drag race bikes, and in the lightweight replacement starter batteries. The bad news is that they are only made in a long-C cell size, not a big rectangular pack. So I would have to build a big pack out of a lot of little cells.

*Batteries are usually rated by how much energy they hold, which translates into the range of the bike. Almost as important is the amount of power they can deliver, which translates into the power of the bike.

The cells are expensive, and would be hard to pack into the available space. A little math showed that 100 cells would make a pack that would deliver most of the power that the motor could use. So I paypalled $800 to some guy on ebay and crossed my fingers.

He delivered.









And one pack is filled. It isn't wired yet. The two packs are different sizes due to the way everything mounts on the bike. This one is smaller, a grid of 9 cells in series, 5 parallel. The other is 11 series, 5 parallel.

Lithium cells require management, and I couldn't find anything off-the-shelf that I liked, so I built these:



They limit the voltage to each cell to prevent overcharging, tell the charger when each cell is nearly charged to get the charger to slow down, and tell the bike if the cell voltage gets to low so it doesn't discharge them too much.
Luke is offline   Reply With Quote
Old 07-28-2011, 07:20 AM   #12
earwig
Crowbar of Embrayage
 
earwig's Avatar
 
Joined: Apr 2006
Oddometer: 4,707
Sweeeet!!!!


What an amazing project, and the bike rides really nice already. I can't wait to see how it feels after some of your power delivery tweaks!

Luke, you are an inspiration. Majorly impressive accomplishment!
earwig is offline   Reply With Quote
Old 07-28-2011, 09:19 AM   #13
Grider Pirate
Beastly Adventurer
 
Grider Pirate's Avatar
 
Joined: Sep 2007
Location: LV, NV
Oddometer: 1,686
What motor are you using? Brushless?
Nice project!
__________________
Please don't tell Mom I'm a pilot. She thinks I play piano in a whorehouse.

http://griderpirate.smugmug.com/
http://www.youtube.com/my_videos?feature=mhum
Grider Pirate is offline   Reply With Quote
Old 07-28-2011, 01:32 PM   #14
DireWolf
Knees in the Breeze
 
DireWolf's Avatar
 
Joined: Jun 2006
Location: In the Mustard Booyah. Whooop!!
Oddometer: 11,630
__________________
Please help Elias' (Toolfan's) young family - they lost a husband and a father: Donation Page: Toolfan Support Fund
DireWolf is offline   Reply With Quote
Old 07-28-2011, 02:48 PM   #15
a1fa
Riding Nomad™
 
a1fa's Avatar
 
Joined: Nov 2006
Location: Arkansas
Oddometer: 13,502
a1fa is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
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 On

Forum Jump


Times are GMT -7.   It's 01:19 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014