I'm a newbie... and love to start things I never finish! Ha!
I'm dieing to build an EV bike but for getting my feet wet and keeping costs low I've gone the pusher route. I've not found very many projects using the pusher and that surprised me. Would love to see a video of someone using one. Any links?
So here's the plan:
MY1070 Motor 36volt 750 watt
(2) 24 volt 75 amp/hr deep cell marine batts from Wally-world
16" wheels taken from a CHEAP kids bicycle... the bearings won't last.
I plan to over-volt the motor with 48 volts. Only one wheel will be driven on the trailer. Two sprocket drive (no secondary reduction).
So far I have about $230 in the project. I still need two sprockets, chain, motor controller and BRAKES BRAKES BRAKES!!!
I worked on this on Saturday. Bought some additional steel at Home Depot, did a CAD layout at work and cut the steel on their band-saw, and tack welded the frame together when I got home. Not bad for a days' work!
Except I tacked the battery frame on the opposite side... have to move that. :-[
I've attached some CAD views below. They are VERY rudimentary but allowed me to get started.
The motor came with a #25 - 11th sprocket. If I wanted the pusher to go 30mph I would want a 4:1 ratio. I'm not sure if I want it to go that fast (not even sure it could push me). And this is where I would like some of your thoughts. I know I would like a larger sprocket on the motor anyway. Something in the range of 20 or more teeth to hold down wear and noise.
What ratio do you guys recommend for the sprockets and what size chain. Is #25 ok or should I use #35.
Second... can you recommend a controller that's reasonably affordable. The choices are daunting. I'll even consider one that might require modifications. I'm capable and have some electronics background. (this is a poor man's first project).
and Third... I have an inexpensive 26" bike with lousy breaks. Are there any reasonable generic kits for putting better brakes on bikes? I know this is a big issue for me.
Would love your comments and advise. I would like this to work first time out with a minimum of upgrades later... seems like I spend a lot of money replacing things that I should have just bought in the beginning.
Remember I'm a newbie... be gentle.
6" of snow just fell outside... I have a little time to work on this thing! Bother!