Heavy-Duty 400kW Standby Power – Engineered for Mission-Critical Applications

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 WP13D490E310 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 standby diesel generator solution that keeps your critical systems running when you need them most.

The EM-W550 is more than just another standby diesel 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 1500 RPM (50Hz) with a fuel consumption of just 210.2 g/kW.h, making it a cost-effective standby diesel generator choice for extended backup power.

Powered by WEICHAI – The 12.54L Common-Rail Powerhouse

At the heart of this standby diesel generator lies the WEICHAI WP13D490E310, 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 15.2:1, 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, with the engine focusing on optimizing fuel consumption in the 60%-90% load rate interval

Reduced emissions – Cleaner, more complete combustion meeting China Non-Road Stage 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 31.26 Bar and a mean piston speed of 8.25 m/s—demonstrating outstanding power density and combustion efficiency. The engine draws 33 m³/min of air at rated conditions, ensuring complete combustion and reduced emissions.

What truly sets this engine apart for standby diesel generator applications is its remarkable oil consumption ratio of just ≤0.2% of fuel consumption. With an oil capacity of 30L (high level 34L), the EM-W550 is designed for extended service intervals that minimize downtime. The engine maintains oil pressure between 3.5–5.5 Bar at rated speed, with low-pressure protection at 1 Bar to safeguard the engine from damage.

Built to Start in the Toughest Conditions

A standby diesel generator is only as good as its ability to start when you need it most. The WP13D490E310 starts reliably down to -15°C without auxiliary starting devices, and with intake preheating, it operates confidently down to -35°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. At altitudes below 2000m, the engine can output rated power, and it works reliably even at higher altitudes.

The 24V starting circuit is engineered with robust components: a 7.5kW starter motor and 55A battery charging alternator provide ample starting power that you can count on every time. The starting circuit features 70 mm² wiring, 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 standby diesel 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 113.6 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 managed efficiently, and the system holds 25L of coolant. At rated conditions, total heat dissipation reaches 770.4 kJ/s, with the cooling system removing 187.8 kJ/s of heat while the exhaust carries away 386.4 kJ/s—ensuring stable operating temperatures even during extended run times.