Deyang Rata Launches SILV-500L 500kW Mobile Resistive AC Load Bank for Power Testing Applications

Deyang Rata Technology introduces the SILV-500L, a 500kW mobile resistive AC load bank designed for generator testing, UPS discharge testing, data center load simulation, and battery energy storage system applications. The unit combines 1kW load resolution, 12 independently controlled resistive stages, remote monitoring, and multiple safety protections in a mobile cabinet design.

Deyang Rata Technology Co., Ltd. has introduced its SILV-500L 500kW Mobile Resistive AC Load Bank. Designed for professional power testing and commissioning applications, the new model provides controlled resistive loading for generator sets, uninterruptible power supplies (UPS), data centers, and battery energy storage systems (BESS).

Rated at 500kW with a power factor of 1.0, the SILV-500L operates at 400 Vac and 50 Hz using a three-phase, four-wire configuration with protective earth. Its mobile cabinet design allows the unit to be moved directly to data halls, factory floors, and outdoor testing locations. 

Designed for Multiple Power Testing Applications

The SILV-500L supports generator set load testing, load-step and load-dump testing, UPS discharge testing, power grid balancing, and data center server load simulation. It also supports grid-connection and discharge testing for battery energy storage systems.

With a 1kW load resolution, the unit allows operators to apply controlled resistive loads for rated-load, stepped-loading, and steady-state testing. Its 12 resistive stages provide a combined capacity of 500kW, with individual stages of 1, 2, 2, 5, 10, 10, 20, 50, 100, 100, 100, and 100kW.

The stages are switched through three-pole Schneider or Siemens contactors, with branch fuse protection. The element tolerance is ±3%, while the short-term voltage tolerance is +5%.

Industrial Components and Cooling System

The load bank uses finned stainless-steel tube elements containing nickel-chromium (Ni-Cr) resistance cores. Type 304 stainless-steel louvers and protective mesh are fitted at the hot-air outlet.

Its cooling arrangement consists of two 4kW three-phase AC fans operating at 400 Vac and 50 Hz. The vertical airflow system provides an airflow rate of 70 cubic metres per hour per kilowatt, with automatic phase-sequence correction for the fans.

For monitoring and operation, the SILV-500L includes a digital meter displaying voltage, current, power, frequency, and power factor. Operators can control the unit through a local HMI touchscreen or remote PC software using an RJ45 connection and Modbus TCP communication. An exclusive local or remote control ownership arrangement prevents simultaneous control conflicts.

Mobility, Monitoring and Safety Protection

The SILV-500L features a mobile cabinet fitted with four castors, allowing it to be positioned at different testing locations without requiring lifting equipment or foundation work. Its horizontal side airflow arrangement supports wall-side or side-by-side installation in space-limited data halls and containers.

The control chamber carries an IP54 protection rating, while the complete enclosure is rated IP2X. Operating conditions range from -20°C to +50°C, with a maximum recommended altitude of 2,000 metres.

The unit incorporates fan motor overload protection, low-airflow protection, thermal emergency cut-out, an auxiliary circuit miniature circuit breaker, and a hardwired emergency stop. In the event of an emergency stop or fault, the unit requires manual resetting and a new load command before operation resumes.

Its rated capacity is 500kW at 400 Vac, with derated capacities of 451.25kW at 380 Vac and 405kW at 360 Vac.

Manufacturing and Quality Testing

Production of the SILV-500L begins with reviewing customer requirements and completing the electrical design. The stage configuration, contactors, and fuses are selected according to the required testing capacity and site conditions.

The resistor manufacturing process includes Ni-Cr wire winding, insulation filling, stainless-steel finned-tube encapsulation, and individual dielectric testing. The cabinet undergoes sheet-metal fabrication and painting before the installation of side louvers and hot-air outlet protection mesh.

During assembly, the resistor components, contactors, busbars, and power terminals are integrated into the load modules. The control system incorporates a PLC, HMI touchscreen, digital meters, relay wiring, and fan installation.

Final testing covers dielectric withstand, switching of all 12 load stages, airflow interlocks, protection functions, and full-load temperature rise. Each unit is supplied with a factory test report, operation and maintenance manual, and electrical schematics.

Spare Parts and Maintenance Support

Each SILV-500L unit comes with a spare parts package intended to support maintenance and reduce equipment downtime. The package includes four intermediate relays, three branch fuses, two air-pressure switches, three Ni-Cr elements, and three indicators and push buttons.

The industrial Ni-Cr resistance elements and Type 304 stainless-steel components are designed to withstand high-temperature operating conditions and resist corrosion.

About Deyang Rata Technology Co., Ltd.

Founded in 2013, Deyang Rata Technology Co., Ltd. specializes in the research, development, and manufacturing of low- and high-voltage load banks and power testing systems.

Its product range covers resistive, resistive/reactive/capacitive, rack-mounted, liquid-cooled, and medium- and high-voltage containerized load banks.

As a load bank equipment manufacturer, our company holds ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certifications. It serves customers in power generation, marine and offshore, data center, renewable energy and energy storage, and aerospace industries, with more than 200 customers worldwide.