Bafang 48V 500W 750W Mid Drive Motor Controller Replacement for 8Fun BBS02 Motor. 48V 500W C571-30-514 : Current Limit 18A. 48V 750W C571-30-512 : Current Limit 24A. BBS02/BBS02B:48V 500W, 48V 750W. BAFANG BBS Controller C571-30-511 For BBS01B 36V250W.Compatible with BBS Drive System. All devices and parts are produced by OEM of BAFANG, reliable and in good compatibility. We will show you how to do. The new version controller is with gear shift sensor connector and light connector. Please kindly check the code of the controller you use matches the code of our controller before you placing an order. Is this controller compatible with your Bafang Mid Drive Motor. Our controllers are with Gear Sensor Sensor connector and Light Cable connector.