Cummins · Cummins D6 Commercial Diesel

Cummins C3500 D6

3500 kW standby / 3185 kW prime · Diesel · Liquid-cooled

3500 kW diesel standby generator with QSK95-G2 95L V-16 engine. PowerCommand control, liquid-cooled, the largest D6 Commercial Diesel genset for hyperscale data center and utility standby applications.

Cummins Cummins C3500 D6 generator — specifications and details
Standby power
3500 kW / 3185 kW prime
Voltage options
277/480V, 346/600V, 4160V, 12470V, 13800V
Frequency / Phase
60 Hz · 3-phase
Engine
Cummins QSK95-G2 · 95L
EPA / Emissions
Tier 2
Data CentersManufacturingparalleling-arrayutility
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Overview#

The Cummins C3500 D6 is a 3500 kW (3.5 MW) standby diesel generator set powered by the QSK95-G2 -- a 95-liter, V-16 diesel engine. Rated at 4375 kVA standby and 3981 kVA prime at 60 Hz, the C3500 D6 is the largest single-engine D6 Commercial Diesel genset in the Cummins lineup, operating at the top of the QSK95 power band.

At 3.5 MW per unit, the C3500 D6 maximizes power output per engine in hyperscale data center and utility standby applications. Three units in a paralleling array deliver 10.5 MW of standby capacity. The QSK95-G2's 95 liters of displacement -- the largest in the Cummins power generation range -- provides the foundation for this extreme output level.

Full Cummins vertical integration covers engine, alternator, PowerCommand controls, and cooling. Medium-voltage output (4160V, 12470V, 13800V) is standard for this power class. Fuel consumption runs approximately 245 gallons per hour at full rated load, with a 40,000-hour major overhaul interval under standard standby duty.

Engineering specifications

Fuel system & runtime

Fuel use @ full load
245 GPH
Fuel use @ 75% load
184 GPH
Fuel use @ 50% load
127 GPH

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Estimate runtime for the Cummins C3500 D6

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

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Estimated runtime

1.1 hours(0.0 days)

Fuel consumption ≈ 189.00 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 C3500 D6 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 40,000 hours

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 injection system (MCRS)Injector fault codes, rough running, cylinder imbalance across V-16 banks—moderate
Turbocharger systemReduced boost pressure, excessive exhaust smoke, turbo bearing wear—moderate
Cooling system (high-capacity radiator)Coolant temperature exceedances, system pressure loss under maximum load—severe
Fuel quality / tank degradationFilter clogging, hard starting, injector fouling from stagnant fuel—moderate
Starting system (24V battery bank)Slow crank on 95L displacement, failed start on infrequently exercised units—minor

Frequently Asked Questions

What engine does the Cummins C3500 D6 use?
The C3500 D6 uses the Cummins QSK95-G2 -- a 95-liter, V-16 diesel engine. At 3500 kW, this is the maximum output of the QSK95 platform and the largest single-engine D6 Commercial Diesel genset Cummins offers.
What are the standby and prime ratings of the C3500 D6?
Standby rating is 3500 kW (4375 kVA) at 60 Hz, 0.8 power factor. Prime rating is 3185 kW (3981 kVA). Both at 1800 rpm, 60 Hz, three-phase.
What are the service intervals for the C3500 D6?
Oil and filter changes are due at 500 hours or 12 months. Air filter replacement at 1,000-hour intervals. Fuel filter at 500 hours. Coolant flush at 6,000 hours. Major overhaul interval is 40,000 hours under standard standby duty conditions.
Is the C3500 D6 the largest Cummins diesel generator?
The C3500 D6 is the largest single-engine D6 Commercial Diesel genset. Cummins also offers Centum Series models up to 3000 kW (C3000 D6e) with a different platform design. For power beyond 3500 kW, multi-unit paralleling arrays are the standard approach.
Can OnPoint Generators service the C3500 D6 in Northern California?
Yes. OnPoint Generators provides authorized Cummins service for mega-diesel generators across the San Francisco Bay Area and Northern California. The QSK95 V-16 requires specialized tooling, factory-trained technicians, and attention to the unique demands of 95-liter displacement engines.

Compatible equipment

Transfer switches

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