2 years ago I converted my lwb recumbent using a 700c rear wheel with Bafang motor from Leeds Electric Bikes. About 21 months(2 year warranty)the controllers on all three batteries failed. Replacement controllers lasted about month. Another replacement lasted 4 days. Minimal technical support from Leeds. Giving up on them, I posed the problem to a friend with extensive experience in electronics. He suggested the problem was the motor, that the copper windings in the motor had developed a short which got worse over time, and was frying the controllers. I think he is right. I'm now investigating solutions to the problem that don't involve a Bafang motor or Leeds.