Build a 20s1p A123 Ebike

I installed 4mm bullets for the motor wires as the stock ones just sucked. Topspeed is the same, but got some better startups out of it. I'm getting peaks of 2002 Watts now!

My buddy Jeff made this torque arm for my bike. Now I can finally go all out with power when my other stuff gets here.

does it do wheelieeees with you on it ?

No, but when I put it in low gear and pop a manual wheelie, it gets pretty stupid when I hit the throttle after that.

Jeff did some nice fab work on the torque arm.

He promised a sexy weld and he delivered. Stainless steel, so I don't need to paint the sucker.

Weeding out bad cells from laptop batteries. Trying to build a 13s4p 8000mah battery pack, as a backup source.

where is the damn flux capacitor ?

I build up a ghetto battery pack consisting recycled laptop 18650 size batteries. Total of 13s4p setup. Startup is sucks, as there is not enough Amps. So more pedaling is required. But once you start to roll, it will go all the way to 25mph on a flat road. It just takes longer to get there compared to the lipo pack. Battery pack was at 109F at the end of the trip to work. A 6p pack would do better. I'm running at the max continuous ampdraw of the pack. But now I'm averaging 500W, like the system is rated for.

I'm at 18s Lipo now and did a test run at 31mph. I'm using a sensorless controller with the same ebay motor and same dinky thin wires with 4mm bullets. I blew up my eagletree in the process. But I verified the speed with my Iphone GPS. 31 Mph on a bicycle is stupid fast and scary.





update:

Went 34mph. Peaked at 3600W and only used 2000mah to my commute to work this morning. Got to love HV setups.

Pulling 1000W average at full throttle.


Sipping power 19mph@318W

I went 37mph on 20s1p today and the front felt light. I'll keep it around 25mph and only use my max power leaving the stoplight.

Damn 37 is hauling A,ss. That sounds like a lot of fun and a little scary all at once.

37mph is crazy on a bike. The cool part is that since I'm running such a high voltage, my ampdraw is really low at 20mph or so. My commute back home took a solid 1700mah!! hahahha got to love HV setups man.

I'm picturing this next.
HAHAHAHAAH

Talk about HV and having some serious capacity.

All I have to say is holy crap!!! You're like an evil mad scientist. 37MPH sounds like fun on an open road but around the Houston traffic, that sounds downright scary. It's bad a$$ though! Me likey.

Yea rather do 37mph on my BMX bike then a Moutain bike lol, more stable..

I relocated everything to the center of the bike as of yesterday. Much more stable now at max speed. Doesn't look stealth anymore though.

PICS???

So what are you dressed in riding this thing ?
Croch rocket Biker gear or Harley Gear ,..... that spandex Skin tight stuff ?

No pics yet. I changed some stuff around again. I need to build me a new wiring harness and a precharge connector as well. The 20S Acepow power source is kickbutt good. I have another pack to make a total of 22S, but that is just overkill. Still charging at 4.1V per cell, twice a day, 6 times a week. I have over 260 miles allready on the batteries.

I just wear my work jeans and orange biker shirt. I wanted white spandex short with a lace shirt, but people might of gotten the wrong idea.

Still funny how some people cut in front of me to proof that their car is faster off the light.

Maybe something like this

Added 30A fuses to both the positive and negative wire. Swapped out the deans for 5mm bullet connectors for the ease of using the precharge resistors. I use dual 1W 100Ohms resistors. Zero sparks now with 20S lipo. My setup doesn't look stealth anymore though. I had to choice as it was 95F today and there is no way the speed controller would keep it's head cool in the closed bag.

Everybody watching this thread................ 35+ mph on a bike is freaking awesome!!!!

That speed is crazy on a bike. As the weather is warming up again, I'm dropping back to 16S to keep the motor temps down.......untill I can get spare motor.