I'll tell you more about my plan...at least my early first ideas(which likely will change with more research/help)
* I'd like this to mostly run 'sporty' @ lower city speeds 0~35mph...so gear reduction for that?
* commute range is not large:
... 3.5miles from my home to my shop(7 miles round trip, tho I'd be able to charge at either end)
... 9miles out to the marina from home(we keep our 30' cabin-cruiser in a slip out there, so I do have power and I would be able to ride it out on the dock to the boat)
so those requirements are really fine for a small electric motorcycle?
however: on both commutes, there are 1~3 mile stretches where the speed limit gets up to 55mph
...and esp. on the mile or so stretch out to my shop, its a killer as people tailgate you like crazy unless you are going more than 60mph(even if I'm pulling a trailer with crap falling off) as that road connects the city with the interstate(I-80) and then goes out to a smaller town that people zip back and forth to as fast as they can
...also I'd like a pretty good 'run time'...it would be great to 'play' on it for an hour without recharging
ok, so thats where this gets harder:
* as while 'range' isn't so important, i dont want to have to charge after every 20min.
* and it might be nice that this bike was originally designed and built for spirited low speeds, I'm gonna still need to 'kick it into high gear' and make a run for it to get out of peoples way on the highway
as for parts I'm looking at lower cost and ease of use, as well as doing a pretty simple build
...this will be my first adventure into DIY EV, so I want it to be as straight forward as possible and achievable
* battery cell modules
seems like I have to use the recovered Nissan Leaf modules
people seem to love these, but I wont have tons of space to fit a big 'block' or stack of them(but I have an idea on how to arrange them in the Derbi) so while using a bunch 18650 cells stuck together would be great, weigh less, fit better; I just dont want to spend all my time~energy figuring that all out
... so 9 Leaf modules for 63~75volts ?
* motor
looking at the goldenmotor HPM3000B
these seem small, light, and I think I've seen them installed in bikes of this size...not sure if I'll need to water cool it or not
price is right at only ~$300...and it might even be more powerfull than the 8.5hp 50cc engine the Derbi used
... so 3KW(6KW peak) 72volt 5000rpm ?
* controller
goldenmotor has the VEC200/72Vdc sine wave controller at $260 to go with that motor, so I just use that ?
https://www.goldenmotor.com/frame-bldcmotor.htm
I dont think I'll need a BMS(I guess I can just manually check each module?) but Contactor and Fuse, twist throttle ...gonna have to do some wild wiring if the Leaf battery modules aren't in a neat stack
and I dont know about a charger(but I think it would be cool to use the Nissan 120v charging cord/brick the Leaf comes with, and the standard plug they use at charging stations)...seen those on eBay, and it would be nice to have another one for the car...but can I get it to work on the Derbi ?
DC to DC 12v and 5v (yeah, and LED lights) , also one of those Cycle Analyst meter things
one of the interesting things Im thinking of doing is the drive-train, I'd might even change to belt(s), as to get the Leaf modules in: I'm looking at moving the motor up under the seat, just behind the top shock mount...then run a pulley system down to a cross shaft, and that shaft goes over to the normal front sprocket location and belt or chain to the rear wheel....this would give me the proper gearing ...and/or it might be nice to install a 2 or 3 speed transmission vs direct connection or with that single speed cross-shaft
hmmm ?
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