S866 Controller and Display Set – Effortless E-Bike Control
Whether you are replacing a faulty unit or upgrading your e-bike’s electronics, the S866 controller and display set provides a comprehensive, all-in-one solution. It is designed to work seamlessly with 24V, 36V, and 48V brushless motors at 250W and 350W, making it a versatile choice for most standard electric bikes on the market.
Note: This set is exclusively for brushless motors. Please verify your motor’s voltage and power rating before purchase.
Why choose this set? (Key Advantages):
- Universal Compatibility: Supports 24V, 36V, and 48V systems, eliminating the need for separate controllers for different battery configurations.
- Automatic 120°/60° Detection: The controller automatically identifies your motor’s Hall sensor type, requiring no manual configuration.
- 20 Programmable Parameters (P01–P20): Easily customise your ride, including PAS levels, speed limits, wheel size, and maximum current directly via the display.
- 20A Rated Current: Ensures stable power delivery with built-in overload protection for 250W and 350W motors.
- Low-Voltage Protection: Automatically cuts off power at 19V, 29V, or 39V (depending on battery voltage) to prevent deep discharge and battery damage.
- Simple Installation: Features standardised connectors and included wiring, allowing for a quick setup in under 30 minutes.
Performance and Features
Engineered exclusively for brushless motors, this controller ensures smooth, quiet operation without unwanted vibrations. The 20A output also makes it suitable for 500W motors, provided the voltage remains within the specified limits.
The S866 LCD display provides real-time data, including speed, battery level, distance, and active PAS mode. The intuitive menu allows you to adjust settings in seconds—no complex manuals or hidden configurations required. The cruise control function (P17) allows you to maintain a steady speed without holding the throttle, perfect for long, straight roads.
| Parameter | Specification |
|---|---|
| Operating Voltage | 24V / 36V / 48V |
| Rated Power | 250W (24V) / 350W (36V, 48V) |
| Rated Current | 20A |
| Low Voltage Cut-off | 19V (24V) / 29V (36V) / 39V (48V) |
| Motor Type | Brushless |
| Motor Detection | Automatic 120° / 60° |
| Display | S866 LCD |
| Programmable Parameters | 20 (P01 – P20) |
| Pedal Assist (PAS) | Yes – configurable levels (P05) |
| Cruise Control | Yes (P17) |
| Speed Units | km/h or mph (P02) |
| Speed Limiter | Yes (P08) |
Programming and Usage Instructions
- Power on the S866 display and hold the MODE button for 3 seconds to enter the menu.
- Navigate through parameters using the + and – buttons; confirm your selection with MODE.
- P01 – Adjust display brightness.
- P02 – Select speed units: km/h or mph.
- P03 – Set battery voltage (24V / 36V / 48V) for accurate low-voltage protection.
- P05 – Set the number of PAS assist levels.
- P06 / P07 – Input wheel size and magnet count for precise speed calculation.
- P08 – Configure the maximum speed limit.
- P14 – Adjust maximum current based on motor power.
- P16 – Reset the odometer (ODO) if required.
- P17 – Enable or disable the cruise control function.
- Exit the menu by holding MODE or waiting for the automatic timeout.
Package Contents
- 1x 24V/36V/48V – 250W/350W/20A Brushless Controller
- 1x S866 LCD Display
- Connection wiring harness
Frequently Asked Questions
Is this compatible with any electric bike?
It is compatible with any e-bike using a 24V, 36V, or 48V brushless motor (250W–350W). It does not work with brushed motors. It can support 500W motors if the voltage remains within the specified limits.
Can I use this with a 500W motor?
Yes, under normal operating conditions. The 20A output is compatible with 500W motors, though optimal performance is guaranteed within the 250W–350W range.
Does the S866 display work with other controllers?
It is optimised for the controller included in this set. Compatibility with other controllers depends on the communication protocol, which can be configured via parameter P20.
Do I need to know the Hall sensor angle of my motor?
No. The controller automatically detects whether your motor uses 120° or 60° sensors. If the motor does not start correctly, please check your phase and sensor cable connections first.
Is installation difficult?
Not if you have experience with e-bike maintenance. The set uses standardised connectors and includes all necessary wiring. If you are a beginner, we recommend professional assistance for the first installation.
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