![]() ![]() I also included a second master/kill switch in the wiring set up that has a remote control switch. The Bluetooth enabled smart BMS came with an Android app that I planned to use with a smartphone configured for the bike, and this would be used to switch the discharge side of the BMS on/off as a pseudo master switch. Having studied the Kelly KLS7275H wiring diagram, I confirmed with Kelly that pin 7 does require the full 72v voltage (not 12v as some sources suggested). I’d been gifted an as new contactor (Tyco Kilovac EV200AAANA) with suitable pre-charge resistor, only to discover that this needed 12v to operate the solenoid, so a second 72v to 12v convertor was included in the configuration to drive this. I decided to ditch the 12v battery on the bike completely and just use the 72v pack, with a convertor to step this down to 12v to power the lights, indicators etc. Smart Bluetooth BMS capable of 160A continuous 320A peak Having decided on a hub motor set up I went for the following motor/controller/battery spec:Ĭustom 72v 40Ah 20s10p pack using Samsung 40T cells So this meant a hub motor with continuous power rating of 4000w or less. ![]() In some cases an engineer report is also required. I decided I would keep the EV conversion as a 50cc/moped as in the UK this is just a matter of registering the change from petrol to EV with the DVLA and having the necessary paperwork demonstrating the power of the motor. I had originally looked at importing one of these to the UK but when I went into it, and the challenges of getting it through an MSVA test to be roadworthy, the cost and effort wasn’t worth it. It’s very similar to the base bike from companies like Hanbird selling Chinese Electric Motorcycles with hub motors from QSMotor of various ratings. This is a Chinese Yamaha R3 clone imported to the UK, using a pretty generic frame and 50cc pitbike engine. You can see where that ended up on my original thread (), but suffice to say that there were too many issues with the limited width of the swingarm and further mods required to it would have led to issues registering the conversion with the UK DVLA authority.Īs there’s still some interest in the build from folks here on the forum here is a new thread documenting it from the beginning, this time using a new donor bike, a Yamasaki YM50-RE. Those reading this may well remember back in 2019 this build started with an Aprilia RS50 as the donor bike. As it’s not something for the track, I wasn’t too concerned about unsprung weight issues of using a hub motor. My goal wasn’t to create some superbike EV equivalent, rather a lightweight moped/125cc equivalent suitable for commuting, max speed around 50-55 mph and a range of circa 30-35 miles. I’ve been playing about with electric bike conversions for a couple of years now, and progressed along the way, like I’m sure many on here, from standard pedal bike conversion, Enduro frame build to finally a full motorbike conversion. ![]()
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