6S-20S ESC Waterproof ZTW 150A ESC Dolphin FOC HV OPTO High Voltage

ZTW Dolphin 150A FOC HV OPTO Waterproof ESC 6-20S High-Voltage for Heavy-Duty Subsea and Marine Propulsion

High-Voltage FOC for Heavy Industrial Subsea Systems

The Dolphin 150A FOC HV OPTO extends the Dolphin FOC line to 6-20S LiPo (customizable), bringing high-voltage efficiency and field-oriented control to heavy-duty ROVs, large AUVs, and industrial marine propulsion systems.

60A Continuous / 150A Burst at Up to 20S

With 60A sustained and 150A peak across a 6-20S range, this ESC delivers high-voltage, lower-current power delivery for efficient subsea propulsion. The customizable voltage range allows OEMs to tailor the ESC to specific battery architectures.

FOC Efficiency for Extended Missions

Field-oriented control minimizes motor copper and iron losses, translating to longer dive times and reduced thermal load — critical for deep-water AUVs and ROVs where passive cooling in sealed enclosures is challenging.

Parameterless Programming for OEM Integration

Auto motor parameter identification eliminates complex setup, enabling rapid integration into production subsea vehicles. Consistent performance across units simplifies quality control for marine OEMs.

Optocoupler-Isolated Signal Input

HV OPTO galvanic isolation protects sensitive subsea control electronics from power-stage noise and ground loops, ensuring robust communication in high-voltage marine propulsion systems.

Full Waterproof Industrial Build

Fully sealed waterproof construction withstands deep-water pressure, saltwater corrosion, and temperature extremes, making the 150A FOC suitable for the most demanding subsea operating environments.

Heavy-Duty Wiring & Shielded Cable

8-gauge power (105mm) and motor (130mm) wires handle high currents with minimal loss. The 26AWG shielded signal cable (1085mm) rejects EMI, and field-upgradable firmware ensures long-term adaptability.

Technical Specifications

FAQ
1. What voltage range does this ESC support? What are its continuous current and peak current?

A: The ZTW Dolphin 150A FOC HV OPTO supports 6S to 20S lithium batteries (voltage range customizable) [1†L5-L7]. Its continuous current is 60A, and its peak (instantaneous) current is 150A [1†L5-L7]. This "high voltage, low current" power transmission design significantly reduces line losses, making it ideal for heavy underwater propulsion systems requiring long-endurance operations, such as deep-sea ROVs (Remotely Operated Vehicles) and large AUVs (Autonomous Underwater Vehicles) [1†L5-L7].

2. What are the advantages of "FOC (Field-Oriented Control)" technology?

A: FOC (Field-Oriented Control) is an advanced motor control algorithm that precisely controls the motor's torque and speed, resulting in smoother and more efficient motor operation [1†L8-L10]. Specific advantages include:

Extended operating time: By minimizing copper and iron losses in the motor, electrical energy is converted into propulsion more efficiently, thereby extending the diving operation time of underwater equipment [1†L8-L10].

Reduced heat load: Reduced energy loss means less heat generation, which is especially important for sealed underwater hulls where passive cooling is difficult [1†L8-L10].

Quieter operation: FOC control makes the motor run more smoothly, reducing vibration and noise [1†L8-L10].

3. What does "parameterless programming" mean for this ESC?

A: "Parameterless Programming" means that the ESC has an automatic motor parameter recognition function [1†L11-L13]. Users do not need to manually input complex motor parameters (such as pole pairs, internal resistance, inductance, etc.). The ESC will automatically detect and match the connected motor after power-on [1†L11-L13]. This feature greatly simplifies the commissioning process, enabling rapid integration of the ESC into mass-produced underwater vehicles and ensuring performance consistency across different devices, facilitating quality control for marine equipment OEMs [1†L11-L13].

4. Is this ESC waterproof? Is it suitable for use in seawater environments?

A: Yes. The ZTW Dolphin 150A FOC HV OPTO features a fully sealed waterproof design [1†L17-L19]. It can withstand deep-water pressure, resist seawater corrosion, and adapt to extreme temperature changes [1†L17-L19]. Therefore, it is ideal for long-term stable operation in the most demanding underwater operating environments, such as deep-sea ROVs, large AUVs, and various industrial-grade marine propulsion systems [1†L17-L19].

5. What does "OPTO" mean? Does this ESC have BEC output?

A: "OPTO" indicates that this ESC uses an optocoupler-isolated signal input design [1†L14-L16]. This design transmits control signals through photoelectric conversion, achieving physical isolation between the high-voltage power circuit and the low-voltage control circuit [1†L14-L16]. It effectively protects sensitive control electronic equipment such as the flight controller and main control computer from power-side voltage fluctuations and electromagnetic interference, ensuring stable and reliable communication in high-pressure underwater propulsion systems [1†L14-L16].

Please note: This is an OPTO (without BEC) ESC; it does not provide an externally powered BEC output [1†L25-L27]. You will need to provide a separate external power module for the flight controller, receiver, and other equipment [1†L25-L27].

6. What are the cable specifications for this ESC? Does it support firmware upgrades?

A: To handle high current transmission and reduce losses, it is equipped with an 8AWG power cord and an 8AWG motor cord (some models have a 10AWG motor cord) [1†L31-L33]. The signal line is a 26AWG shielded cable, which effectively suppresses electromagnetic interference and ensures signal integrity during long-distance transmission [1†L31-L33].

Yes, it supports firmware upgrades [1†L28-L30]. Users can set parameters via ZTW's LCD programming card G2, a mobile app, or a remote control joystick [1†L28-L30], and on-site firmware updates are supported, ensuring the product's adaptability and maintainability during long-term use [1†L28-L30].