Accunergi NPS / NPT Series Single & Three Phase Rectifier and Battery Charger

The Accunergi NPS and NPT Series Rectifier and Battery Charger systems are engineered for high-reliability industrial standby power applications, supporting both single-phase (NPS) and three-phase (NPT) power inputs. Backed by more than five years of expertise in standby power electronics, these systems are purpose-built for environments where continuous and stable DC power is essential.

The system operates by converting the AC supply through a transformer and power converter, delivering a filtered and regulated DC output to both the connected load and the standby battery. A dedicated main control circuit manages isolated triggering while continuously sensing rectifier voltage and current to ensure stable, controlled output under varying load conditions.

Technical Specifications

Input Characteristics

• Single-Phase (NPS): 110V / 220V / 240V (±10%)

• Three-Phase (NPT): 380V / 400V / 415V (±10%)

• Frequency: 50Hz / 60Hz (±5%)

Output Characteristics

• Nominal DC Voltages: 12V, 24V, 30V, 48V, 110V, 220V

• Output Stability: Static regulation within ±2% for 10–100% load variation

• Charging Mode: Constant voltage / constant current (I/U) in accordance with DIN 41773

Protection & Reliability Features

To ensure safe and dependable operation in industrial environments, the NPS and NPT Series include multiple protection mechanisms:

• Soft-Start Function: 4-second walk-in to limit inrush current

• Surge Suppression for input power disturbances

• Short-Circuit Protection: Current limiting at 110% of rated output current

Industrial Applications

The NPS and NPT Series are designed for demanding infrastructure and heavy-duty industrial environments, including:

• Energy & Utilities: Power stations, substations, transmission & distribution systems, dams

• Infrastructure: Airports, MRT, railway and LRT systems, water treatment plants

• Critical Facilities: Hospitals, data processing centers, defense installations

• Heavy Industry: Petrochemical facilities (onshore and offshore), turbine control systems

Mechanical & Environmental Specifications

• Enclosure: Epoxy powder-coated, RAL 7032 Light Grey

• Ingress Protection: IP20

• Operating Temperature: −10 °C to +40 °C (derating up to +55 °C)

• Physical Configuration:

  • Wall-mount cabinets

  • Floor-standing cubicles

Customisable Options

Accunergi offers a wide range of configuration options to meet specific site and operational requirements:

• 12-pulse rectifier configuration

• Digital metering

• DC earth fault alarm

• Battery temperature compensation

• Remote communication via RS232 / RS485