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Discussion Starter #1
So, I've been thinking about building a EV Bike (no money for a car right now), which I thought would be really complicated and/or impossible for me to do. Upon finding this forum I realized I could do it. So, and after a lot of research I got to this:

A Yamaha Zuma (In Europe it's called Bw's) that can reach 50mph and do about 80-100 miles.

http://www.bikez.com/motorcycles/yamaha_bws_2006.php

After my calculations based on your Beginners Guide, this could be achieved with a 72v motor, and preferably Li-po's, or at least I hope so, that's where you experts come in :p

So I guess a 5kw with 72v would do the trick, although many of you may think it's overkill, well, I don't need to max out the motor all the time, so, in a 6000rpm max motor, if I geared the bike in a way that it would reach 50mph in the 3000-4000 rpm range, i guess the motor won't be stressed all the time, I would end up getting better milleage, and won't hurt the batteries too much. (This is what's going on in my head, I need your help before I start buying anything)

These are the motors I found that fit my needs:
http://www.thunderstruck-ev.com/index.php?dispatch=products.view&product_id=3
http://goldenmotor.com/hubmotors/hubmotor-imgs/HPM5000B-BLDC.jpg

I was thinking the alltrax (http://www.thunderstruck-ev.com/index.php?dispatch=products.view&product_id=7) would be a nice controller, although the price could be sweeter, so, and by looking at the kelly controllers, if I used http://kellycontroller.com/kbl7210124-72v100abldc-controllerwith-regen-p-56.html , would the 50A give me enough power to have normal-good acceleration and 50mph speed? If not, how much would I need?
Or should I just stick with the Goldenmotor HPC300A?
Bare in mind that I weight about 80kg and the bike(With the ICE) 75kg.

Next are the Batteries.
After the calculations 150Ah is what's needed to make the 80 mile range possible. Here's were my biggest question is, in the guide there isn't a clear explanation, do I need 150Ah to cover the distance, or should I have much more than that?

I am going for LifePO4, and, the only ones I can match up to the bike (Under the seat, helmet space and fuel tank, are 22x these: http://stores.headway-headquarters.com/-strse-1/Headway%2C-batteries%2C-EV%2C-solar/Detail.bok

Okay, so, what do you think?
 

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I am going for LifePO4, and, the only ones I can match up to the bike (Under the seat, helmet space and fuel tank, are 22x these: http://stores.headway-headquarters.com/-strse-1/Headway,-batteries,-EV,-solar/Detail.bok
You don't need 22x headway 10Ah to have 72v 150Ah...... you need 330 cells!!!!!

You range of 80 miles seem imposible to reach.....

I have a good exemple for you :
http://www.diyelectriccar.com/forums/showthread.php/suzuki-drz-sm-2005-electric-48239.html

I put cells at many place, but I only have 90 cells on the bike. That give to me aproximatively 30 miles at 35 MPH of average speed.
 

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Have you looked into the Motorcycle hub motor ?? That would give you room for more batteries inside the frame. Also, allow for regen braking for a LITTLE extra range ??
 

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Discussion Starter #5 (Edited)
can't help with the motorcycle but be cautious of Headway Headquarters.
I only used the link as an example, thanks for the warning though! I'm trying to source everything out from European countries, as the cost of importing expensive parts will be really high.

You don't need 22x headway 10Ah to have 72v 150Ah...... you need 330 cells!!!!!
Oh, please, can you explain to me how do I do those calculations? I thought it was strange to have so few batteries. I had seen your thread and you made an awesome bike!

Have you looked into the Motorcycle hub motor ?? That would give you room for more batteries inside the frame. Also, allow for regen braking for a LITTLE extra range ??
I haven't found a hub motor that fit what I want. Most are only 48v, and I wanted at least 72v for efficiency, and those who are 72v or more have really low Kw and most have a mph max of about 25-35! Regen braking is something I want to use, as I even though of putting up some solar panels, but I read around here that they can make the whole system even heavier.

Keep the comments coming!:D

Btw, Before I though about Lifepo4, I was thinking about using lipo's, but from what I could search in several stores, a 20c battery will have a high voltage and a low Ah rating, so, can I have a sum of batteries that will have a higher voltage than the motor or controller?

Thanks
 
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