Customer project – Chopper e-bike, Harley Davidson

The frame was manufactured by the customer himself so that the 3 Bafang BBSHD motors could be placed and mounted. The other add-on parts are original Harley Davidson components. In addition to the 3 1000W motors, this chopper bike was also fitted with 3x Lekkie chainrings with 28 teeth, 3x DPC-18 displays, 1x thumb throttle and 3x 14S 7P Li-Ion batteries with Samsung 35E cells (total capacity 3,000Wh – 4,200Wh). The total power of the bike is up to max. 5,300W.

The main challenge was to make the 3 motors run synchronously, as they are connected to each other with their own chain. This was solved by using a separate display for each motor – as with a normal e-bike – with the difference that they are controlled via a common control unit. For this purpose, intermediate cables were connected in parallel and protected against mutual interference by means of diodes. As a result, all displays switch to the same support level when upshifting and downshifting. Of course, all motor and controller settings must match. The standard Bafang controllers were used for the motors. The 3 batteries are located in the side cases.

When using the sidecar, 3 more batteries are used, as the total weight is approx. 340 kg (bike + sidecar + 2 people).