1750 kW standby / 1500 kW prime diesel generator. Cummins QSK50 V16 50.3L platform for data centers, large hospitals, campuses, and mission-critical paralleling arrays.
The Cummins QSK50 (C1750 D5) is a 1,750-kilowatt standby diesel generator built on the QSK V16 platform — Cummins' purpose-built high-horsepower engine series for the most demanding standby and prime power applications. At 50.3 liters across 16 cylinders, the QSK50 powers data centers, large hospital campuses, and mission-critical industrial facilities where reliable high-capacity standby is non-negotiable.
The QSK platform uses Cummins' Modular Common Rail System (MCRS) fuel injection for precise control and efficiency, paired with a turbocharged-aftercooled air system that maintains consistent power output across the full load range. Medium-voltage alternator options allow direct connection to 4.16 kV and 12–14 kV distribution systems without external step-up transformers.
The QSK50 is a major-account platform — data centers, hospital campuses, and large industrial facilities. Our service visits combine scheduled maintenance (oil analysis, coolant sampling, turbo inspection, load bank testing) with system-level verification: transfer time testing, paralleling control validation, and fuel system integrity checks. At 1750 kW, fuel management and tank sizing are central to the facility's emergency plan, and we include fuel quality sampling in every service event.
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Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
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
2.1 hours(0.1 days)
Fuel consumption ≈ 94.50 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 Cummins QSK50 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
≈ 24,000 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.
Component
Symptom
Typical hours
Severity
Fuel quality (standby degradation)
Injector fouling, filter clogging, hard starting
4,380+
moderate
Turbocharger(s)
Reduced power, excessive smoke, turbo noise
18,000+
moderate
Starting system (24V battery banks)
Slow crank, failed start requirement
8,760+
minor
Frequently Asked Questions
How does the QSK50 compare to the QSK60?
The QSK50 and QSK60 share the same V16 engine architecture and QSK platform lineage. The QSK60 is the flagship at 2000 kW standby (60.2L); the QSK50 delivers 1750 kW standby from 50.3L. For facilities that need between 1500 and 2000 kW, the QSK50 provides the same mission-critical reliability at a lower installed cost and physical footprint than the QSK60.
What are the high-voltage output options on the QSK50?
The QSK50 is available with medium-voltage alternator configurations: 4160V, 12470V, 13200V, and 13800V. Medium-voltage output eliminates step-up transformers on large campuses and data center installations where the distribution system operates at medium voltage — reducing equipment count, cost, and failure points.
Is the QSK50 used in paralleling arrays?
Yes. The QSK50 with PowerCommand paralleling controls is a common paralleling platform for 3.5–10 MW facilities. Multiple units in N+1 or 2N configurations provide redundancy and load flexibility. At 1750 kW per unit, fewer generators are needed compared to smaller platforms to reach multi-MW capacity.
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