Bafang BBSHD 48V 52V 1000W 28V/30A Mid Drive Motor Controller ReplacementController Current :48V 1000W C769-51-501 : Current Limit 30A52V 1000W C571-30-506 :Current Limit 28ABBSHD:1000WAbout this item :Compatible with BBSHD Drive System.All devices and parts are produced by OEM of BAFANG, reliable and in good compatibility.If you don't how to assembly or disassembly, you could contact us and we would provide you with guidance.All controllers in this product link are New Version (With Light Connector & Gear Shift Sensor Connector)If you are not sure the controller version, feel free to contact us, please.Notes:Please check your own controller serial number on the motor before ordering. Do not buy if the serial number is different from our controller.Do not change the different voltage and power controllers on the motor. For example, you ordered a 36V 250W motor, but you want to change the controller to 36V 350W or 48V 250W, etc. Please buy 36V 250W for your 36V 250W motor.