S866 Controller & Display Kit – Complete, hassle-free control for your electric bike
Has your old controller given up the ghost, or are you looking to upgrade your e-bike’s entire electronic setup? This S866 controller and display kit sorts it out in one go. It works seamlessly with 24V and 36V brushless motors at power ratings of 250W and 350W — meaning it’s compatible with virtually any standard e-bike on the market.
Note: This kit is exclusively designed for brushless motors. Please double-check your motor’s voltage and power rating before purchasing.
Why choose this kit? (Key advantages):
- Dual 24V / 36V compatibility — covers the most common battery voltages without needing to buy separate sets for different setups
- Automatic 120° / 60° detection — the controller automatically identifies your motor’s Hall sensor type with zero manual configuration required
- 20 programmable parameters (P01–P20) — easily adjust pedal assist (PAS), speed limits, wheel size, max current, and more directly from the display
- 20A nominal current — rock-solid stability at maximum power, complete with automatic overload protection built specifically for 250W and 350W motors
- Deep discharge protection — cuts off automatically at 19V or 29V depending on your battery voltage, safeguarding your pack from damage
- Straightforward plug-and-play installation — comes with standardised connectors and full wiring included for a quick setup in under 30 minutes
Details and Performance
Engineered exclusively for brushless motors, this controller ensures ultra-quiet operation with zero extra vibration. Its robust 20A current output also makes it suitable for 500W motors, provided your operating voltage stays within the permitted limits.
The S866 display clearly shows your real-time speed, battery level, trip distance, and active PAS mode. Accessing the settings menu takes just 3 seconds — tweak what you need and exit straight away, with no clunky manuals or hidden menus to wade through. The built-in cruise control function (P17) holds your speed steady without needing to keep your thumb pinned on the throttle, which is a lifesaver on long, straight stretches.
| Parameter | Value / Detail |
|---|---|
| Operating voltage | 24V / 36V |
| Nominal power | 250W (24V) / 350W (36V) |
| Nominal current | 20A |
| Minimum battery voltage | 19V (24V) / 29V (36V) |
| Compatible motor type | Brushless |
| Motor detection | Automatic 120° / 60° |
| Display included | S866 LCD |
| Programmable parameters | 20 (P01 – P20) |
| Pedal Assist System (PAS) | Yes – configurable levels (P05) |
| Automatic cruise control | Yes (P17) |
| Speed units | km/h or mph (P02) |
| Speed limiter | Yes (P08) |
Programming and User Guide
- Power on the S866 display and enter the menu by holding down the MODE button for 3 seconds.
- Navigate through parameters using the + and – buttons; confirm your selection with MODE.
- P01 — adjust screen backlight brightness to suit your riding conditions.
- P02 — select your preferred speed unit: km/h or mph.
- P03 — set your battery voltage (24V / 36V) to ensure correct low-voltage protection.
- P05 — choose how many PAS assistance levels you want available.
- P06 / P07 — input your wheel size and magnet count for pinpoint speed tracking.
- P08 — configure your maximum speed limit.
- P14 — fine-tune the maximum current limit to match your motor’s wattage.
- P16 — reset your total odometer distance (ODO) if needed.
- P17 — turn the automatic cruise control function on or off.
- Exit the menu by holding down MODE or simply wait a few seconds for it to auto-save and close.
What’s in the Box
- 1x 24V / 36V – 250W / 350W / 20A brushless controller
- 1x S866 LCD display
- Complete wiring harness included
Frequently Asked Questions
Is this compatible with any electric bike?
It works with any e-bike equipped with a 24V or 36V brushless motor rated between 250W and 350W. It is not compatible with brushed motors. It can also support 500W motors as long as the voltage remains within the allowed limits.
Can I use this kit with a 500W motor?
Yes, under normal riding conditions. The controller delivers 20A, making it fully compatible with 500W setups, though optimal performance is guaranteed within the specified 250W–350W range.
Does the S866 display work with any controller?
It’s optimised specifically for the controller included in this kit. Compatibility with third-party controllers depends on their communication protocol, which can be configured via parameter P20.
Do I need to know my motor’s Hall sensor phase angle?
No. The controller automatically detects whether your motor uses 120° or 60° sensors. If your motor doesn’t spin smoothly right after installation, check your phase and sensor wire connections first.
Is installation difficult?
Not if you’ve tinkered with e-bikes before. The connectors are standardised and the full wiring harness is included. If this is your first time upgrading and you’re unsure, we recommend having a professional technician lend a hand.
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