VOTOL EM50 SP (LIN)
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 $76 across 5 sellers.
Specs verified Jul 20, 2026
Where to Find
Prices tracked across 5 sellersAliExpress
$91.98
AliExpress - SIAECOSYS Official Store
$76.90 + $21.14 shipping
AliExpress - SiAECOSYS Electric Powertrain Store Store
$76.34 + $23.70 shipping
AliExpress - SIA Tech Store
$85.31 + $24.82 shipping
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
$85.81 + $24.94 shipping
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
$85.81 + $24.94 shipping
AliExpress
Check seller for priceAliExpress
Check seller for priceAliExpress - SIAECOSYS Official Store
Out of stockAliExpress - SiAECOSYS Electric Powertrain Store Store
Out of stock* Shipping estimates are for the contiguous US and may vary by location.
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Price History
Price History
Price changes tracked by the crawler
Current best price $76.34. Over the past 90 days: low $75.60, high $104.16, average $86.20 — down 11% vs average.
- AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
- AliExpress - SiAECOSYS Electric Powertrain Store Store
- AliExpress - SIAECOSYS Official Store
- AliExpress
- AliExpress - SIA Tech Store
- AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
- AliExpress - SiAECOSYS Electric Powertrain Store Store
- AliExpress - SIAECOSYS Official Store
All Records
98 price records in this period
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress(12 records) | |||||||||
| Jul 7, 202607:57 AM | $91.98 | — | $91.98 | $12.18 | — | — | — | Yes | active |
| May 29, 202610:33 AM | $104.16 | — | $104.16 | $0.10 | — | — | — | Yes | active |
| May 28, 202609:01 AM | $104.06 | — | $104.06 | $0.06 | — | — | — | Yes | active |
| May 27, 202610:20 AM | $104.00 | — | $104.00 | $0.00 | — | — | — | Yes | active |
| May 25, 202601:55 PM | $104.00 | — | $104.00 | $6.40 | — | — | — | Yes | active |
| May 23, 202610:17 AM | $97.60 | — | $97.60 | $0.00 | — | — | — | Yes | active |
| May 22, 202609:01 AM | $97.60 | — | $97.60 | $0.04 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202609:07 AM | $97.64 | — | $97.64 | $0.00 | USSS12−$12.00 | — | — | Yes | active |
| May 19, 202609:09 AM | $97.64 | — | $97.64 | $0.18 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202609:08 AM | $97.46 | — | $97.46 | $5.92 | USSS12−$12.00 | — | — | Yes | active |
| May 16, 202609:07 AM | $103.38 | — | $103.38 | $0.10 | — | — | — | Yes | active |
| May 14, 202609:38 AM | $103.48 | — | $103.48 | Initial | — | — | — | Yes | active |
AliExpress - SIA Tech Store(14 records) | |||||||||
| May 29, 202610:33 AM | $85.31 | $24.82 | $110.13 | $0.42 | — | — | — | Yes | active |
| May 28, 202609:01 AM | $85.73 | $24.82 | $110.55 | $0.04 | — | — | — | Yes | active |
| May 27, 202610:20 AM | $85.69 | $24.82 | $110.51 | $0.00 | — | — | — | Yes | active |
| May 25, 202601:55 PM | $85.69 | $24.82 | $110.51 | $0.16 | — | — | — | Yes | active |
| May 23, 202604:40 PM | $85.53 | $24.82 | $110.35 | $4.76 | — | — | — | Yes | active |
| May 22, 202609:01 AM | $80.77 | — | $80.77 | $0.05 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202609:07 AM | $80.82 | — | $80.82 | $0.00 | USSS05−$5.00 | — | — | Yes | active |
| May 19, 202609:09 AM | $80.82 | — | $80.82 | $0.61 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202609:08 AM | $80.21 | — | $80.21 | $5.36 | USSS05−$5.00 | — | — | Yes | active |
| May 17, 202609:01 AM | $85.57 | — | $85.57 | $0.00 | — | — | — | Yes | active |
| May 16, 202609:07 AM | $85.57 | — | $85.57 | $0.00 | — | — | — | Yes | active |
| May 15, 202609:01 AM | $85.57 | — | $85.57 | $0.08 | SRUS02−$2.00 | — | — | Yes | active |
| May 14, 202609:07 AM | $85.65 | — | $85.65 | $0.04 | SRUS04−$4.00 | — | — | Yes | active |
| May 12, 202609:07 AM | $85.61 | — | $85.61 | Initial | SRUS07−$7.00 | — | — | Yes | active |
AliExpress - SiAECOSYS Electric Powertrain Store Store(18 records) | |||||||||
| Jul 20, 202608:02 AM | $76.34 | $23.70 | $100.04 | $0.10 | — | — | — | Yes | active |
| Jul 7, 202607:57 AM | $76.24 | $23.65 | $99.89 | $0.64 | — | — | — | Yes | active |
| Jun 25, 202607:59 AM | $75.60 | $23.55 | $99.15 | $0.71 | — | — | — | Yes | active |
| Jun 10, 202608:01 AM | $76.31 | $23.68 | $99.99 | $9.54 | — | — | — | Yes | active |
| May 29, 202607:27 PM | $85.85 | $23.68 | $109.53 | $0.00 | SSUS08−$8.00 | — | — | No | active |
| May 28, 202605:04 PM | $85.85 | $23.68 | $109.53 | $0.04 | — | — | — | No | active |
| May 27, 202606:26 PM | $85.81 | $23.66 | $109.47 | $4.92 | — | — | — | No | active |
| May 23, 202606:17 PM | $80.89 | $23.60 | $104.49 | $0.00 | — | — | — | No | active |
| May 22, 202604:14 PM | $80.89 | $23.60 | $104.49 | $0.04 | USSS05−$5.00 | — | — | No | active |
| May 21, 202604:18 PM | $80.93 | $23.62 | $104.55 | $0.00 | USSS05−$5.00 | — | — | No | active |
| May 19, 202604:21 PM | $80.93 | $23.62 | $104.55 | $0.60 | USSS05−$5.00 | — | — | No | active |
| May 18, 202604:17 PM | $80.33 | $23.55 | $103.88 | $5.36 | USSS05−$5.00 | — | — | No | active |
| May 17, 202602:20 PM | $85.69 | $23.62 | $109.31 | $0.00 | — | — | — | No | active |
| May 16, 202602:19 PM | $85.69 | $23.62 | $109.31 | $0.00 | — | — | — | No | active |
| May 15, 202601:27 PM | $85.69 | $23.62 | $109.31 | $0.03 | SRUS02−$2.00 | — | — | No | active |
| May 14, 202603:58 PM | $85.72 | $23.63 | $109.35 | $0.05 | SRUS04−$4.00 | — | — | No | active |
| May 14, 202609:38 AM | $85.77 | $23.65 | $109.42 | $0.05 | — | — | — | Yes | active |
| May 12, 202611:55 AM | $85.72 | $23.63 | $109.35 | Initial | SRUS07−$7.00 | — | — | No | active |
AliExpress - SiAECOSYS Electric Powertrain Store Store(11 records) | |||||||||
| May 29, 202602:04 PM | $85.93 | $23.71 | $109.64 | $0.08 | — | — | — | No | active |
| May 28, 202612:32 PM | $85.85 | $23.68 | $109.53 | $0.04 | — | — | — | No | active |
| May 27, 202601:51 PM | $85.81 | $23.66 | $109.47 | $0.00 | — | — | — | No | active |
| May 25, 202605:52 PM | $85.81 | $23.66 | $109.47 | $4.92 | — | — | — | No | active |
| May 23, 202601:55 PM | $80.89 | $23.60 | $104.49 | $0.00 | — | — | — | No | active |
| May 22, 202612:32 PM | $80.89 | $23.60 | $104.49 | $0.04 | USSS05−$5.00 | — | — | No | active |
| May 21, 202612:35 PM | $80.93 | $23.62 | $104.55 | $0.00 | USSS05−$5.00 | — | — | No | active |
| May 19, 202612:37 PM | $80.93 | $23.62 | $104.55 | $0.60 | USSS05−$5.00 | — | — | No | active |
| May 18, 202612:35 PM | $80.33 | $23.55 | $103.88 | $5.36 | USSS05−$5.00 | — | — | No | active |
| May 17, 202610:32 AM | $85.69 | $23.62 | $109.31 | $0.00 | — | — | — | No | active |
| May 16, 202610:38 AM | $85.69 | $23.62 | $109.31 | Initial | — | — | — | No | active |
AliExpress - SIAECOSYS Official Store(13 records) | |||||||||
| Jun 25, 202607:59 AM | $76.90 | $21.14 | $98.04 | $1.24 | — | — | — | Yes | active |
| Jun 10, 202608:01 AM | $78.14 | $21.25 | $99.39 | $8.49 | — | — | — | Yes | active |
| May 29, 202610:02 PM | $86.63 | $21.18 | $107.81 | $0.00 | SSUS08−$8.00 | — | — | No | active |
| May 28, 202607:23 PM | $86.63 | $21.18 | $107.81 | $0.00 | — | — | — | No | active |
| May 23, 202607:50 PM | $86.63 | $21.18 | $107.81 | $4.82 | — | — | — | No | active |
| May 22, 202605:24 PM | $81.81 | $21.18 | $102.99 | $0.04 | USSS05−$5.00 | — | — | No | active |
| May 21, 202605:42 PM | $81.85 | $21.20 | $103.05 | $0.00 | USSS05−$5.00 | — | — | No | active |
| May 19, 202605:31 PM | $81.85 | $21.20 | $103.05 | $0.15 | USSS05−$5.00 | — | — | No | active |
| May 18, 202605:27 PM | $81.70 | $21.14 | $102.84 | $14.59 | USSS05−$5.00 | — | — | No | active |
| May 17, 202603:35 PM | $96.29 | $21.20 | $117.49 | $9.63 | — | — | — | No | active |
| May 16, 202603:19 PM | $86.66 | $21.20 | $107.86 | $0.00 | — | — | — | No | active |
| May 15, 202602:20 PM | $86.66 | $21.20 | $107.86 | $0.03 | SRUS02−$2.00 | — | — | No | active |
| May 14, 202605:32 PM | $86.63 | — | $86.63 | Initial | SRUS04−$4.00 | — | — | No | active |
AliExpress - SIAECOSYS Official Store(15 records) | |||||||||
| May 29, 202603:14 PM | $87.34 | $21.28 | $108.62 | $0.52 | — | — | — | No | active |
| May 28, 202601:42 PM | $86.82 | $21.25 | $108.07 | $0.04 | — | — | — | No | active |
| May 27, 202603:03 PM | $86.78 | $21.24 | $108.02 | $0.00 | — | — | — | No | active |
| May 25, 202607:29 PM | $86.78 | $21.24 | $108.02 | $0.15 | — | — | — | No | active |
| May 23, 202603:10 PM | $86.63 | $21.18 | $107.81 | $4.82 | — | — | — | No | active |
| May 22, 202601:34 PM | $81.81 | $21.18 | $102.99 | $0.04 | USSS05−$5.00 | — | — | No | active |
| May 21, 202601:38 PM | $81.85 | $21.20 | $103.05 | $0.00 | USSS05−$5.00 | — | — | No | active |
| May 19, 202601:40 PM | $81.85 | $21.20 | $103.05 | $0.15 | USSS05−$5.00 | — | — | No | active |
| May 18, 202601:38 PM | $81.70 | $21.14 | $102.84 | $4.96 | USSS05−$5.00 | — | — | No | active |
| May 17, 202611:41 AM | $86.66 | $21.20 | $107.86 | $0.00 | — | — | — | No | active |
| May 16, 202611:47 AM | $86.66 | $21.20 | $107.86 | $0.00 | — | — | — | No | active |
| May 15, 202610:57 AM | $86.66 | $21.20 | $107.86 | $0.08 | SRUS02−$2.00 | — | — | No | active |
| May 14, 202611:54 AM | $86.74 | $21.23 | $107.97 | $0.00 | — | — | — | No | active |
| May 14, 202609:38 AM | $86.74 | $21.23 | $107.97 | $0.11 | — | — | — | Yes | active |
| May 10, 202610:28 AM | $86.63 | $21.18 | $107.81 | Initial | — | — | — | Yes | active |
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store(5 records) | |||||||||
| May 30, 202607:54 AM | $85.81 | $24.94 | $110.75 | $0.00 | — | — | — | Yes | active |
| May 29, 202605:08 PM | $85.81 | $24.94 | $110.75 | $0.08 | — | — | — | Yes | active |
| May 28, 202603:25 PM | $85.73 | $24.90 | $110.63 | $0.04 | — | — | — | Yes | active |
| May 27, 202604:46 PM | $85.69 | $24.89 | $110.58 | $0.00 | — | — | — | Yes | active |
| May 25, 202609:12 PM | $85.69 | $24.89 | $110.58 | Initial | — | — | — | Yes | active |
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store(10 records) | |||||||||
| May 29, 202601:26 PM | $85.81 | $24.94 | $110.75 | $0.08 | — | — | — | Yes | active |
| May 28, 202611:55 AM | $85.73 | $24.90 | $110.63 | $0.04 | — | — | — | Yes | active |
| May 27, 202601:13 PM | $85.69 | $24.89 | $110.58 | $0.00 | — | — | — | Yes | active |
| May 25, 202604:57 PM | $85.69 | $24.89 | $110.58 | $0.16 | — | — | — | Yes | active |
| May 23, 202601:11 PM | $85.53 | $24.82 | $110.35 | $4.76 | — | — | — | Yes | active |
| May 22, 202611:56 AM | $80.77 | $24.82 | $105.59 | $0.05 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202611:59 AM | $80.82 | $24.84 | $105.66 | $0.00 | USSS05−$5.00 | — | — | Yes | active |
| May 19, 202612:01 PM | $80.82 | $24.84 | $105.66 | $0.61 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202611:59 AM | $80.21 | $24.77 | $104.98 | $5.36 | USSS05−$5.00 | — | — | Yes | active |
| May 17, 202609:54 AM | $85.57 | $24.84 | $110.41 | Initial | — | — | — | Yes | active |
Reviews
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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 Input
Power
| Pin | Wire color | Function |
|---|---|---|
| 1 | Red | Battery + |
| 2 | Black | Battery - |
Phase Wires
Motor Phase
| Pin | Wire color | Function |
|---|---|---|
| 1 | Yellow | Phase A |
| 2 | Green | Phase B |
| 3 | Blue | Phase C |
Hall Sensor/
Hall Sensor
| Pin | Wire color | Function |
|---|---|---|
| 1 | Red | 5V Power |
| 2 | No color | None |
| 3 | Black | Ground |
| 4 | Yellow | Hall A |
| 5 | Green | Hall B |
| 6 | Blue | Hall C |
Function Harness (2×8)
No port details available
Alarm / Anti-theft Harness (2×4)
No port details available
