We are excited to offer high-performance Surron controllers like the ND72680, specially designed for Surrons!Upgrade your old Surron controller with our specially designed FarDriver ND72680 Surron Controller. Tailored for high-performance electric bikes like the Surron, this 72V controller delivers up to 330A max DC current and a protective 680A phase current. With a larger heatsink for enhanced cooling, this version ensures reliable performance, even under intense conditions. The sine wave BLDC technology offers smoother, more efficient power delivery for 4-6kW QS motors and stock surron motors, making it ideal for off-road or high-power applications. Key Features: Max Voltage: 88V Max DC Current: 330A Max Phase Current (Protective): 680A Motor Compatibility: Designed for 4-6kW QS motors, perfect for Surron builds Heatsink: Enlarged heatsink for superior thermal management Programmable: Bluetooth-enabled for custom tuning Sine Wave Controller: Delivers efficient, smooth, and quiet power Waterproof Rating: IP67 Ideal for Surron riders who demand maximum power and durability from their controller, ensuring that your bike can handle the toughest terrains and longest rides. Please note that custom wiring may be required depending upon accessories used. User Responsibility: It is the user's responsibility to thoroughly inspect all products upon delivery, ensure that all components are functioning properly, and complete the installation. We highly recommend that users have a good understanding of battery systems before installation. If unsure about any aspect of the controller, such as installation or safety checks, please contact us for guidance. The necessary checks must be performed to guarantee safe operation. We are not liable for any issues that arise after delivery, such as damages from improper installation or user error. Any damage incurred during installation or use is the sole responsibility of the user. For warranty and return details please check out the 'Returns & Warranty' Page on our site.