First, thanks to motomech, LewTwo, John (rumped6), and everyone else at ES who helped me find the right parts to achieve my goals with this, my first build. This is a great community. This build started out with a 2012 MAC motor from John but unfortunately it wasn't playing nicely with the controller due to the advanced hall timing. I tried to relocate the halls and damaged a winding. So, long story short I picked up a Bafang SWXK from a neighbor (Bike Swift, https://www.bikeswift.com
) to replace it.
Here's my bike, it's a 1993 Trek 1200 road bike with an aluminum frame and CrMo front fork. I wanted to use my existing bike for this build to keep costs down, and the steel front fork seemed like a better place to put a motor than a 126mm rear aluminum dropout.
I got a box of parts from BMS Battery today. Well packed, not missing anything, and I even got a hand written thank you note from Sherry who helped me place my order. Impressive.
The battery case is indeed the "jumbo shark" or "new hailong", as I suspected. It has a USB port and enough room for 65 cells, 13s5p. The sticker says 20Ah but it was advertised at 14.5Ah. The sine wave controller is built into the mount, it's in the small metal box. Looks like 6 FET and I think I see a shunt that could be modified for more power, though it seems like any extra heat in such close proximity to the cells would be a bad idea. Let me know if you guys see anything of interest, I don't really know much about controller internals/components.
I got a handlebar extender from eBay and cut a piece of pipe to give me a good place to mount the throttle, LCD, control, and my bell.
My water bottle rivnuts are too low to mount the battery on, so I got some hose clamps to slide it further up. I ended up shortening most of the cables for a cleaner installation. For the HWBS, I used the 2 connectors from the brake levers that came with my kit - one for the standard signal and ground, and one for the 5v supply, which I got from the throttle (I added an extra wire).
Overall, I'm happy with how it turned out. It goes fast enough for the bike paths around here, I can cruise at around 24mph when I want to, and it makes the 10% grade hills near my house seem easy. The PAS is really nice, I barely find a need for the throttle. Now I'm just counting the days until they open the bike lane on the bridge I take to work every day.
Motor: Bafang SWXK from Bike Swift, https://www.bikeswift.com
Battery: 48v 14.5Ah 13S5P Panasonic NCR18650PF, https://bmsbattery.com/ebike-battery/81 ... ttery.html
Controller: Integrated into battery case, 18-20A sine wave, same as the one in this package https://bmsbattery.com/ebike-battery/77 ... ttery.html
Throttle: Thumb, same as the one in this package https://bmsbattery.com/ebike-battery/77 ... ttery.html
PAS: 8 pole, same as the one in this package https://bmsbattery.com/ebike-battery/77 ... ttery.html
Wiring: Motor wire and splitter harness, same as the ones in this package https://bmsbattery.com/ebike-battery/77 ... ttery.html
LCD: S-LCD3, same as the one in this package https://bmsbattery.com/ebike-battery/77 ... ttery.html
E-Brake: HWBS, https://bmsbattery.com/ebike-parts/459- ... parts.html
Torque Arm: Custom arm for SWXK from Bike Swift, https://www.bikeswift.com