High Speed Regenerative DC Load Systems for OCP Power Shelves – From 30 kW to 2 MW

W5 Engineering delivers modular, field scalable high speed regenerative DC load systems that are purpose built for Open Compute (OCP) ORv3 power shelves, 48 V racks, AI/GPU power shelves and next generation server power supplies.

Our systems combine microsecond class current slew rates with the world’s most compact high density architecture – 30 kW in just 4U and up to 300 kW in a single 19" rack – and scale seamlessly to multi megawatt installations.

Why OCP Power Shelves Need a New Class of DC Load

OCP Open Rack V3 (ORv3) power shelves and 48 V architectures are pushing rack power well beyond 30 kW while demanding extremely fast dynamic response to GPU and accelerator workloads.

ORv3 guidelines and vendor implementations call for high peak load capability – typically 150–160% of rated load – with fast current slew rates around 5 A/µs to emulate real server and GPU transients at the power shelf level.

Traditional DC loads built for steady state burn in cannot reproduce these fast, high amplitude pulses on a full 48 V bus without huge hardware overhead, excessive heat, or custom low inductance fixtures.

The OCP Tests Our Systems Are Built To Solve

W5 High Speed Modular Test (HPMT OCP) systems are engineered around the actual test conditions called out in ORv3 power system documents and leading supplier design guides.

1. Shelf Level Peak Load and Pulse Testing

ORv3 power shelf designs, such as 3 kW rectifier based shelves, demonstrate repetitive step loads from 60 A to 450 A per shelf with current slew rates on the order of 5 A/µs to validate bus stability and voltage regulation.

Our 80 V high current modules deliver up to 1000 A per 30 kW unit with targeted slew rates up to 6 A/µs, enabling shelf level peak load tests up to and beyond 160% of rated current in a compact cabinet.

2. Rack Level 48 V Bus and Power Shelf Aggregation

ORv3 racks aggregate multiple power shelves and PSUs in N+1 and N+N configurations to reach rack power levels exceeding 30 kW, with future designs targeting 100 kW and beyond per rack.

W5 HPMT OCP systems scale from a single 30 kW shelf emulator to 300 kW per 19" rack and further into multi rack arrays up to 2 MW, allowing you to validate busbars, connectors and distribution under realistic worst case pulsed loading.

3. Fast Dynamic Load Response (EDPP, GPU and AI Profiles)

Data center power specifications now emphasize electrical data peak processing (EDPP), where loads jump from idle to full compute within microseconds, driving tight limits on output voltage deviation and recovery time.

Our high speed regenerative loads apply clean, repeatable load steps that mirror GPU and AI accelerator behavior, enabling measurement of overshoot, droop and recovery on 48 V shelves and server PSUs under realistic patterns.

4. Protection, Fault and Redundancy Behavior

ORv3 power shelves and high power PSUs must coordinate over current protection (OCP), over voltage (OVP), short circuit response and current sharing across multiple rectifiers and shelves.

W5 systems support controlled fault injection, fast step down events and shelf drop simulations so you can verify protection thresholds, fold back behavior and seamless fail over or redundancy at scale.

W5 High Speed Modular Test Systems – Built for OCP Power Labs

Every W5 HPMT OCP system is built from high speed regenerative DC load building blocks and integrated into turnkey racks, with safety, control and connectivity optimized for hyperscale power labs.

Key Electrical Capabilities

System Level Features

Why OCP Power Shelf Designers Choose W5

Reproduce Real OCP and Hyperscale Conditions

Our systems are tuned to the same kinds of load profiles and slew rates documented in ORv3 power system references and leading 48 V power shelf design guides, so your test setup reflects real data center behavior rather than idealized lab loads.

You can script shelf level pulse tests, 160% peak load events and rack level aggregation scenarios that mirror published requirements and internal qualification plans.

Compact, Scalable and Lab Friendly

Packing 30 kW into 4U and 300 kW into a single 19" rack allows you to consolidate what previously required multiple load cabinets and resistive banks into a small, serviceable footprint.

High efficiency energy recovery means far less heat added to already stressed lab HVAC systems, enabling long test runs without building infrastructure upgrades.

Designed for Engineers, Program Managers and CTOs

Engineers get deep control: programmable transients, scripting APIs, precise measurement and repeatable conditions from PSU bench validation all the way to rack level system tests.

Program managers and CTOs get predictable capacity planning – clear kW and kA roadmaps from initial 30 kW benches through multi megawatt test farms that can grow with OCP platform roadmaps.

Beyond OCP: Additional High Value Applications

While W5 HPMT OCP systems are optimized for OCP power shelves and hyperscale server PSUs, the same high speed, regenerative platform excels in several adjacent applications.

AI / GPU Rack and HVDC Bus Testing

Validate 48 V GPU power shelves and HVDC rack converters that experience rapid load swings due to AI, ML and accelerator workloads, using realistic, high di/dt load profiles.

Automotive and EV 48 V Subsystems

Stress 48 V DC DC converters, auxiliary power and high bandwidth regulators used in EVs and software defined vehicles under sharp transient loading while regenerating energy back to the grid.

Fuel Cell, Supercapacitor and Pulsed DC Sources

Characterize fuel cell stacks and supercapacitor banks with fast charge/discharge pulses and long duration cycling in R&D and validation labs, without building bespoke load fixtures.

Avionics, Space and Defense Power Electronics

Test 28 V, 270 V and 270–800 V DC bus converters for radar, RF and mission critical electronics with fast pulsed loads that uncover stability issues early in the design cycle.

Model Range – From 30 kW to Multi Megawatt Systems

W5 HPMT OCP systems are available across low, medium and high voltage ranges, each with extensive current and power scaling options.

All systems share the same core architecture and safety framework, so you can deploy a common platform across PSU, shelf, rack and cabinet test stations.

Ready to Align Your Test Lab with OCP and Hyperscale Requirements?

Whether you design OCP ORv3 power shelves, 48 V GPU racks, high power server PSUs or the infrastructure that feeds them, W5 Engineering can help you build a high speed regenerative DC load system that matches your roadmap – and grows with it.

Contact W5 Engineering to discuss your current OCP test specification, target rack power and transient requirements, and we’ll configure a system from 30 kW to 2 MW that fits your lab, your standards body requirements and your schedule.