E-Bike System

[zeropointbug]

Here are 4 pics I just shot. Battery mounting is TEMPORARY (along with some wiring), was doing work on it and just threw it back on for the pic. Tires are temporary as well, going to purchase some fat sticky rubber tires soon to really grip hard on our bad roads here. I know I loose about 4kph top speed (and thus Wh/mile) vs. road tires, but the safety and handling is well worth it.

I was pondering the idea about putting the battery in a standard size ammo box and using a rear cargo mount, as they can hold 40+lbs apparently.

Cheers

[mistercrash]

aaaah! Finally some pics.... I feel better now thank you

Very nice even with what you call temporary stuff on it. It looks like a nice, good, solid set up. I read from some people that a big battery in the rear on a rack makes for some funky handling. Many have the opinion that the battery belongs in the frame's triangle, just like what you did for a lower CG and better handling.

[Thomas]

I went with a 9C direct drive BL hub motor and 40 A controller from Grin Technologies in Canada (ebikes.ca). Their customer service has been great and the cycle analyst is very useful (low voltage limit, speed limit, Wh/km etc.).
Picture of the completed bike:
https://twitter.com/webetho/status/2.../photo/1/large

Attached is a picture of my torque arm, which is waterjet cut from 6 mm stainless steel, the slot milled to fit the axle and then mounted to the bike frame with an M4 screw. I have one on each side.

I was testing 18s lipo yesterday and reached 63 km/h with max power of 2.5 kW. My drive battery of made of 6s 5 Ah lipo packs. I'm using a seperate 2s A123 battery to power to bike's lights. To avoid sparks when connecting the battery, I split up the positive to an additional connector with a 250 Ohm precharge resistor.

Is it normal that the motor vibrates enough to make a loud noise and I can feel it on the saddle?