I am a senior and am on my fourth diy e-bike and second bafang system. First was a 750w mid drive and now struggling with a 750w rear hub (48v). Bafang has sent the wrong motor to controller cable (Twice)! I will raise this up in my next post. I got started with e-bikes in 2011 with a 700C road bike running a direct drive rear hub on 36v sealed lead acid batteries. My learning curve has been great. Until next time. Kilowatt.