September 1, 20214 yr Hi, I’m hoping there might be somebody with Sunstar ibike experience here (it’s a Japanese crank drive system that is now out of production)? My Sunstar battery only gives me a few miles range now so I bought a new x-go 24v battery from ebay and soldered it in a couple of days ago*, initially it seemed to work fine so I took it for a ride. Unfortunately I caught my rear wheel in a pothole which ripped the tyre/tube and damaged the rim so I had a long walk home! When I had the bike up on the stand at home I just tried to turn on the ibike as usual via the controller and it now doesn’t work. It shows a single flashing red light on the controller which according to the manual is a ‘Battery fault’ – so I was blaming the issue on the x-go battery. I have since swapped my old Sunstar battery back, which I know works but with poor range, and I get the same flashing light. Any thoughts on troubleshooting? I am now wondering if the ibike motor took a knock when I hit the pothole although I can’t see any obvious damage (unlike my wheel!). Many thanks, Chris
September 1, 20214 yr The issue likely is to do with the rear wheel one would suggest as it was fine prior to this. Does it have a separate wheel sensor /spoke magnet ? If so make sure it isn't damaged or the spoke magnet is missing or out of alignment. Was the motor damaged or in contact with the ground ?
September 1, 20214 yr Some useful info here if you find out the controller's knackered. Though I wouldn't use the controller he did. You need a KT controller because you need current control for a crank motor. His is speed control. https://empoweredpeople.co.uk/2019/10/14/bringing-the-sunstar-s03-mid-drive-motors-back-from-the-dead/
September 1, 20214 yr Author Hi [mention=9614]Nealh[/mention], thanks for the suggestions but I don't have wheel sensor /spoke magnet and I'm reasonably sure that the motor didn't hit the ground. The problem occurs as soon as you turn on the system at the handlebar control - one flashing LED which the manual tells me is a battery fault. Last night I reconnected my old Sunstar battery which works I'm sure (has a limited range), exactly the same fault reported.
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