Heavy-Duty 400kW Backup Power – Engineered for Mission-Critical Reliability

When the grid goes down and your operations can’t afford a moment of downtime, you need a generator that delivers uncompromising power and unwavering reliability. The EMEAN EM-W550 provides a solid 400kW (500kVA) of prime power, backed by a 450kW WEICHAI WP13D510E311 turbocharged and aftercooled diesel engine. Whether you’re protecting a hospital, a data center, a manufacturing plant, or a large commercial facility, this is the diesel backup generator solution that keeps your critical systems running when you need them most.

The EM-W550 is more than just another diesel backup generator—it is a purpose-built power system engineered to withstand the demands of heavy industrial and commercial environments. With a standby rating of 440kW (550kVA), this unit provides ample headroom for starting heavy equipment with high inrush currents and handling sudden load surges. The generator operates at 1800 RPM (60Hz) with a fuel consumption of just 204.5 g/kW.h, making it a cost-effective diesel backup generator choice for extended backup power.

Powered by WEICHAI – The 12.54L Common-Rail Powerhouse

At the heart of this diesel backup generator lies the WEICHAI WP13D510E311, a 6-cylinder, 12.54-liter turbocharged and aftercooled diesel engine with an inline configuration. With a bore and stroke of 127×165 mm and a compression ratio of 15:1, this large-displacement platform delivers exceptional torque and thermal efficiency. The engine features an advanced electro-controlled high-pressure common-rail fuel injection system—representing the latest generation of diesel engine technology. Unlike traditional mechanical pump systems, common-rail technology delivers fuel at extremely high pressures directly to the injectors, ensuring precise metering and atomization for each cylinder. This results in:

Lower fuel consumption – Optimized combustion efficiency reduces fuel waste

Reduced emissions – Cleaner, more complete combustion meeting Non-road China III emission standards

Quieter operation – Smoother, more controlled combustion reduces engine noise

Better cold-start performance – High-pressure fuel delivery ensures reliable ignition in cold conditions

The engine achieves a mean effective pressure of 2.711 MPa and a mean piston speed of 9.9 m/s—demonstrating outstanding power density and combustion efficiency. The engine draws 2,503 kg/h of air at rated conditions, ensuring complete combustion and reduced emissions.

What truly sets this engine apart for diesel backup generator applications is its remarkable oil consumption ratio of just 0.2% of fuel consumption. With an oil capacity of 30L, the EM-W550 is designed for extended service intervals that minimize downtime. The engine maintains oil pressure between 350–550 kPa at rated speed, with low-pressure protection at 120 kPa to safeguard the engine from damage.

Built to Start in the Toughest Conditions

A diesel backup generator is only as good as its ability to start when you need it most. The WP13D510E311 starts reliably down to -10°C without auxiliary starting devices, and with intake preheating, it operates confidently down to -30°C. This exceptional cold-start capability makes the EM-W550 a practical choice for installations across North America and Europe, where winter storms can knock out the power grid for days.

The 24V starting circuit is engineered with robust components: an 8.5kW starter motor and 70A battery charging alternator provide ample starting power that you can count on every time. The starting circuit features 70 mm² wiring and a 24V/100A heating grille, ensuring ample current delivery to the starter even in the coldest conditions.

Engineered for Quiet, Efficient Operation

The EM-W550 features a soundproof canopy lined with sound-reducing foam, making it a diesel backup generator that respects both industrial and urban environments. The industrial silencer and modular ventilation design further reduce noise levels, while all-metal canopy parts are powder-coated for durability and corrosion resistance. The engine’s noise level is rated at 114.6 dB(A) (acoustic power level)—well-managed for a 400kW diesel unit.

The engine’s thermal management is equally impressive. The closed-loop water cooling system is rated for operation up to 45°C ambient temperature, with a thermostat that begins opening at 76°C and reaches full opening at 88°C. Coolant flow is 28.7 m³/h, and the system holds 25L of coolant. At rated conditions, total heat dissipation reaches 1,094.9 kJ/s, with the cooling system removing 159.4 kJ/s of heat while the exhaust carries away 331.9 kJ/s—ensuring stable operating temperatures even during extended run times.

Complete Generator Set Features

The EM-W550 generator set is built around the WEICHAI engine and features a VG-314FM brushless alternator with Class H insulation and IP23 protection. The alternator is available from leading brands including Stamford, Leroy-Somer, or Marathon, giving customers flexibility in their specification. The digital control panel (Smartgen or Deep Sea) includes auto-protection features such as overcurrent shutdown and low oil pressure alarm.

Key features of the complete generator set include:

Base frame fuel tank with customizable capacity for 8–10 hours of continuous runtime

Digital control panel with automatic protection and monitoring

Soundproof canopy lined with sound-reducing foam for quiet operation

MCCB air circuit breaker for overcurrent shutdown protection

Industrial silencer for silent-type generator sets

5mm thickened bent chassis with double-layer anti-corrosion painting

Forklift hooks and crane holes for easy installation and relocation

External emergency stop button for safety compliance

Steel chassis with anti-vibration pads to minimize transmitted vibration

Lockable doors on front and back for easy maintenance access

Glass panel window for visual inspection of the control panel

Diesel level sensor providing information to the controller

Optional ATS (Automatic Transfer Switch) for seamless power transition

Optional remote control, jacket heater, and oil heater for enhanced functionality