Secure Power Control
Our Power Distribution Unit manages, protects, and monitors your electric system, ensuring safe, efficient, and reliable power flow in all conditions.
Built for installers
STOK’s Power Distribution Unit is a versatile solution for battery-based systems, engineered to simplify installation and enhance system reliability. With smart design and robust performance, the PDU ensures efficient power flow and safer integration, making it ideal for diverse energy setups across marine and mobile applications.
Our high-voltage Power Distribution Units (HV PDUs) are the central hub for safe and efficient DC power distribution in electric systems. Designed for voltages ranging from 48 to 800 VDC, they manage power flow between batteries, inverters, chargers, DC-DC converters, and more.
With a modular design, our PDUs are ideal for marine applications, energy storage systems (ESS Integration), electric vehicles, construction equipment, and other high-voltage systems. Whether used as part of a complete STOK system or standalone, they offer unmatched flexibility, reliability, and safety.
* Custom Configurations Available
Secure Power Control
Built on recognized technology, this solution ensures high performance and reliability. Extensively tested for dependable operation, even in demanding environments, providing long-term, consistent performance in all conditions.
Integrated features for safe switching, protection, and monitoring of all high-voltage paths. The system maximizes safety and efficiency, offering real-time control to prevent failures, ensuring reliable operation even under heavy load.
Supports insulation monitoring, pre-charge, HVIL, current/voltage sensing, and real-time CAN diagnostics. These features continuously monitor the system’s health, providing instant feedback and improving both safety and performance.
A flexible system layout with space for contactors, fuses, DC-Link, control electronics, or BMS components. This modular design enables tailored configurations, ensuring compatibility with various vessel types, both for new builds and retrofits.
Corrosion-resistant, IP-rated enclosures are built to endure harsh conditions. Ideal for marine, industrial, and mobile use, the rugged design guarantees reliable operation in extreme environments, minimizing maintenance and ensuring durability.
Designed for quick integration with connector layouts and minimal cable complexity. This reduces installation time and simplifies setup, making it ideal for diverse vessel configurations, ensuring an efficient and streamlined process.
Simplify Installation
STOK Electric’s Power Distribution Unit simplifies electrical integration with a universal, plug-and-play design. Engineered for fast installation, the PDU combines flexible mounting options and standardized connections to support a wide range of applications. Built for durability and ease of use, it streamlines system setup while ensuring reliable power delivery across all environments.
Simplify your system
Our HV PDUs can be tailored to meet your system architecture. A wide range of functions can be integrated to reduce footprint, wiring and system complexity.
Safety first. Our Power Distribution Unit (PDU) is built with integrated safety components, including an insulation monitoring device (IMD), high-voltage fuses, and safety relays. These components ensure continuous monitoring, rapid fault detection, and immediate system shutdown in case of insulation failures, overcurrent, or electrical faults, protecting both equipment and personnel at all times.
The PDU features a High Voltage Interlock Loop (HVIL), a critical safety system that monitors the integrity of all high-voltage connections. If a connector becomes improperly attached or disconnected, HVIL instantly disables the high-voltage circuits, preventing dangerous electrical exposure and ensuring maximum operational safety.
To prevent component damage from sudden inrush currents, the PDU incorporates a pre-charge circuit. This system carefully charges capacitors to the correct voltage before full power is applied, safeguarding sensitive electronics, increasing system lifespan, and enabling a controlled, reliable start-up.
The PDU uses CAN-bus communication to guarantee fast, secure, and reliable data exchange between all key system components. CAN integration allows for streamlined diagnostics, real-time monitoring, and effortless connectivity to motor controllers, batteries, and external monitoring systems.
Our PDU design includes reserved space for integrated Battery Management System (BMS) functions. This modular approach simplifies the overall system design, minimizes wiring complexity, and enables close communication between battery packs and the propulsion system for optimal performance and monitoring.
To meet diverse installation needs, the PDU supports a wide range of connector types. Whether you require customized battery connections, motor outputs, or auxiliary power interfaces, our flexible connector options ensure secure, reliable, and application-specific solutions.
Powering Diverse Solutions
Our PDU technology is designed for high-voltage applications across industries. Its compact, customizable nature makes it ideal for:
Efficiency Meets Innovation
| Specs | PDU 500 | PDU 800 |
|---|---|---|
|
Maximum Voltage
|
500V |
800V |
|
Power |
300A |
300A |
|
Charge |
60A |
60A |
|
IP rating
|
IP65
|
IP65
|
|
Insulation Monitor
|
Yes
|
Yes
|
|
Precharge
|
Yes
|
Yes
|
|
Master BMS
|
Yes
|
Yes
|
|
Safety Relais
|
Yes
|
Yes
|
|
IT Grounded
|
Yes
|
Yes
|
|
Battery Compatibility
|
Super B / MG / Custom Integration |
Super B / MG / Custom Integration |
|
Charger Compatibility |
Brusa / TC Charger / Custom Integration |
Brusa / TC Charger / Custom Integration |
Complete Solutions
Discover STOK Electric’s high-performance electric inboard motors for yachts, ferries, and workboats, quiet, efficient, low-maintenance, and ideal for sustainable marine propulsion.
Explore our products to find the perfect electric solution for your boat, or contact us to discover how STOK Electric can power your journey forward.
Understanding STOK Systems
A High Voltage Power Distribution Unit (PDU) safely distributes DC power between all major components of your electric propulsion system — including batteries, inverters, DC-DC converters, and chargers. It acts as the central hub, ensuring efficient power flow and reliable system operation on the water.
Unlike traditional systems where installers custom-build a distribution box for each project, our PDU is a standardised, ready-to-install solution. This drastically reduces installation time, simplifies integration, and improves system reliability, since the design is pre-engineered, tested, and proven in demanding applications.
Our PDUs are built for 48V up to 800VDC, making them compatible with both low-voltage and high-voltage electric systems. This wide voltage range allows for scalable setups, from small pleasure craft to large commercial vessels and ESS installations.
Yes — our PDU is designed with robust, water-resistant enclosures and marine-grade components, making it ideal for saltwater and harsh maritime conditions. Whether used in yachts, workboats, or ferries, it delivers long-term reliability at sea.
Absolutely. While it integrates perfectly with STOK Electric systems, the PDU is also available as a standalone unit, suitable for integration into custom setups — whether you’re building your own electric boat, ESS cabinet, or industrial EV system.
Yes — our PDU features a modular layout that can be tailored to your application. We offer custom configurations depending on the number of inputs/outputs, protection levels, and type of monitoring (e.g. shunts, current sensors, fuses, relays).
The unit includes fuse protection, interlock systems, insulation monitoring, and overvoltage/undervoltage protection. These features ensure safe operation of high-voltage electric systems on board, even in dynamic environments.
Yes — our PDU can be equipped with CAN-Bus communication, allowing for seamless integration with your vessel’s system controller or monitoring display. This enables remote diagnostics, error detection, and real-time power flow insight.
Definitely. The STOK Electric PDU is ESS-ready, making it suitable for land-based or hybrid marine battery storage setups where high-voltage DC switching and protection are needed.
Yes — our PDU is designed to be component-agnostic, meaning it works with a wide range of third-party batteries, inverters, and chargers, as long as they meet the appropriate electrical and communication standards.