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VOTOL EM50 SP is a compact 72V sinewave controller with 50A rated battery current, 55A boost, and 190A peak phase current. Suited for 1-2kW PMSM/BLDC motors — commonly paired with QS90 mid-drive or small QS hub motors in entry-level e-moto / e-scooter builds. Features flux weakening, IP67 waterproofing, and LIN communication. Uses VOTOL's "Old Version" EM/SV-series connector architecture: 3 flush Mini-Fit Jr headers (function 2×8, alarm 2×4, hall 2×3) + screw terminals for power/phase. Programmable via PC with the Old Version USB cable (shared with EM100SP, EM150SP, EM200P).

In brief: 48–72V controller. 50A continuous. 55A peak. Sinewave, dual mode, regen, field weakening support. From $74 across 5 sellers.

Specs verified Sep 8, 2026

Price History

Price History
Price changes tracked by the crawler

Current best price $74.22. Over the past 90 days: low $74.22, high $104.45, average $82.40 — down 10% vs average.

  • AliExpress
  • AliExpress
  • AliExpress - SIA Tech Store
  • AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
  • AliExpress - SiAECOSYS Electric Powertrain Store Store
  • AliExpress - SIAECOSYS Official Store
Jun 25Jul 2Jul 9Jul 16Jul 23Jul 30Aug 6Aug 13Aug 20Aug 27Sep 3$72.00$81.00$90.00$99.00$108.00

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Specifications

Type

VESC Based
No
Cooling
Air

Electrical

Voltage Range
48–72V
Continuous Amps
50A
Peak Amps
55A
Max Phase Amps
190A

Motor Features

Regen Support
Yes
Drive Mode
Sinewave
Sensor Mode
Dual Mode
Field Weakening
Yes
Self-Learning
No
Dual Motor Support
No
Controller Pairing
No

Inputs

Throttle Support
Yes
PAS Support
No

Display

Supports Display
Yes
Requires Display
No
Protocols
SiAECOSYS ONE-LIN

Power Switch

Supports Power Switch
Yes
Requires Power Switch
No
Requires Pre-charge
No

Programming

Via Display
No
Via Phone
No
Via PC
Yes

Physical

Weight
955 g
Dimensions (L×W×H)
200mm × 108mm × 65mm
IP Rating
IP67

Ports & Connectors

Power Input2-position Screw Terminal Block
Power
PinWire colorFunction
1RedBattery +
2BlackBattery -
Phase Wires3-position Screw Terminal Block
Motor Phase
PinWire colorFunction
1YellowPhase A
2GreenPhase B
3BluePhase C
Hall Sensor/
Hall Sensor
PinWire colorFunction
1Red5V Power
2No colorNone
3BlackGround
4YellowHall A
5GreenHall B
6BlueHall C
Function Harness (2×8)
Ignition
Power Switch
PinWire colorFunction
1Gray / PurplePower Switch Signal
Throttle / High Brake / Display
BrakeDisplayThrottle
PinWire colorFunction
1PurpleBrake Signal (High)
2WhiteOne-Wire Comm
3No colorNone
4BlackGround
5GreenThrottle Signal
6Pink5V Power
Three Speed / Sport / Parking
BrakeDisplay
PinWire colorFunction
1Brown / WhiteParking / E-Brake
2Green / WhiteGear Low
3Yellow / WhiteGear Sport
4No colorNone
5BlackGround
6Black / WhiteGear High
Low Brake / Reverse
DisplayBrake
PinWire colorFunction
1No colorNone
2Gray / WhiteGear Reverse
3No colorNone
4Gray / BlackBrake Signal (Low)
Program Port
UART
PinWire colorFunction
1BlackGround
2Pink5V Power
3OrangeUART TX
4BlueUART RX
One Click Repair
COMM
PinWire colorFunction
1No colorNone
2BrownOne-Click Repair
Main Connector
Alarm / Anti-theft Harness (2×4)
Alarm Power
security
PinWire colorFunction
1BlackGround
2RedAlarm Power
Anti-theft Motor Lock
security
PinWire colorFunction
1OrangeAnti-Theft Key
2BlueAnti-Theft Signal
3YellowWheel Signal
4No colorNone
Main Connector

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