As many of you also must have I saw a youtube video with a 48v electric flat tracker built from a beach cruiser frame. From that moment I became obsessed and just had to build one of my own, but better. So when I got my tax refund check I bought two things, a tablet pc for ease of designing and a stretch cruiser bicycle. So far I've been able to transform the bike from this,
The only parts I kept on there from the original bike is the frame, stem, bars and chain. I swapped out the rear wheel for a surly large marge rim and sturmy archer hub. As for the front, I have a disk hub but I think I'm going to be replacing that with a dual disk hub to be mounted on a custom springer fork I'm building based on John Brains design.
I have all the steel and hardware together finally and found a place here in boston that I can do my welding work free of charge. Also I have a 48v-5000w brushless motor from golden motors.
But being a young proletariat I have run into the ol finacial wall, but it was a rather well timed one as I still have to weld in the motor mount and build the fork before I get going on the battery and controller. Which is why I'm here, I still have many questions on what direction to go. It was suggested on another forum that I run this thing at 24 volts but it seems like I would be wasting that powerful motors potential. A123 systems headquarters is right down the street from me and I've been trying to get friendly with those guys as I think they are one of the few battery technologies that could supply the juice I need to power this thing at 48v.
So as it stands right now my next purchase will be an alltrax controller so I can do motor and drive train testing with an alternate power supply before I make that significant battery purchase, but would like some advice from all you ev wizards out there. I've been lurking in here for a while and it's time to step out of the shadows. Any advice would be much appreciated.