SDMO

SDMO D550

440 kW standby · Diesel · Liquid-cooled

SDMO D550 diesel generator — 440 kW standby power with Doosan DP158LDF engine. Specs, features, and service information.

Standby power
440 kW
Voltage options
277/480V
Frequency / Phase
60 Hz · 3-phase
Engine
Doosan DP158LDF · 15L
CommercialManufacturing
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Overview#

The SDMO D550 is a large commercial diesel generator rated at 550 kVA (440 kW) standby, powered by the Doosan DP158LDF inline-six engine. The 15.0-liter Doosan engine provides substantial power output for large commercial facilities, industrial plants, and critical infrastructure that demand reliable standby generation in the 400-500 kW class. The D550 sits at the upper end of SDMO's Doosan-powered lineup.

SDMO equips the D550 with a heavy-duty four-pole brushless alternator, advanced digital controller with paralleling and load management features, and robust enclosure options designed for outdoor installation. The generator delivers three-phase power at 277/480V and 60 Hz. With its large displacement engine and SDMO's proven integration platform, the D550 serves facilities that need high-capacity standby power at a competitive price point relative to premium OEM alternatives.

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Estimate runtime for the SDMO D550

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Estimated runtime

8.4 hours(0.4 days)

Fuel consumption ≈ 23.76 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the SDMO D550 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Coolant change
Every 6000 hours
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours
Load bank test
Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
Fuel quality / degradationHard starting, filter clogging, reduced power4,380+moderate
TurbochargerPower loss, excessive smoke under load12,000+moderate
BatteryFailed to start, slow crank8,760+minor

Frequently Asked Questions

What is the kW rating of the SDMO D550?
The SDMO D550 is rated at 550 kVA / 440 kW standby. It uses the Doosan DP158LDF, a 15.0-liter inline-6 diesel engine. The kVA rating reflects apparent power at 0.8 power factor.
What applications is the SDMO D550 suited for?
The D550 serves large commercial facilities, industrial plants, and critical infrastructure in the 400-500 kW standby class. Its digital controller supports paralleling and load management for multi-unit configurations requiring redundancy or scalable capacity.

More in the SDMO D-Series (Doosan)

Doosan-powered diesel gensets from 150 to 700 kW

View all 2models in this series →

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