Cummins · Cummins D6 Commercial Diesel

Cummins C1000 D6

1000 kW standby / 910 kW prime · Diesel · Liquid-cooled

1000 kW diesel standby generator with QST30 30L V-12 engine. PowerCommand control, liquid-cooled, for data center, hospital, and mission-critical standby applications requiring megawatt-class power.

Cummins Cummins C1000 D6 generator — specifications and details
Standby power
1000 kW / 910 kW prime
Voltage options
277/480V, 346/600V, 4160V
Frequency / Phase
60 Hz · 3-phase
Engine
Cummins QST30 · 30L
EPA / Emissions
Tier 2
Data CentersHealthcareManufacturingCommercialparalleling-array
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Overview#

The Cummins C1000 D6 is a 1000 kW (1 MW) standby diesel generator set powered by the QST30 -- a 30-liter, V-12 diesel engine. Rated at 1250 kVA standby and 1138 kVA prime at 60 Hz, the C1000 D6 delivers megawatt-class standby power from the top of the QST30 platform, making it one of the most popular single-engine solutions for data centers and mission-critical facilities.

The 1 MW threshold is a critical benchmark in standby power -- many data center and hospital designs are built around 1 MW genset modules. The C1000 D6 meets this requirement in a single V-12 package with full Cummins vertical integration: engine, alternator, controller, and cooling are all Cummins-designed and manufactured. The QST30 V-12 delivers smooth, balanced power with a 40,000-hour major overhaul interval.

Medium-voltage options (4160V) and PowerCommand 2.3/3.3 paralleling controllers enable multi-genset arrays for sites requiring 2-10 MW of standby capacity with N+1 redundancy. The C1000 D6 is commonly paired with other C1000 D6 units in data center paralleling arrays, providing scalable power that matches load growth.

Engineering specifications

Physical

Length
135 in
Width
72 in
Height
85 in
Dry weight
10,200 lb

Fuel system & runtime

Fuel use @ full load
70 GPH
Fuel use @ 75% load
52 GPH
Fuel use @ 50% load
37 GPH

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Estimate runtime for the Cummins C1000 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

3.7 hours(0.2 days)

Fuel consumption ≈ 54.00 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 C1000 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 systemInjector fault codes, rough running, power imbalance between banks—moderate
Turbocharger(s)Reduced boost, excessive smoke, turbo bearing noise—moderate
Cooling system (V-12 dual-bank)Coolant temperature exceedances, system pressure loss—severe
Fuel quality / tank degradationFilter clogging, hard starting, injector fouling from stagnant fuel—moderate
Starting system (24V battery bank)Slow crank, failed start requirement on infrequently exercised units—minor

Frequently Asked Questions

What engine does the Cummins C1000 D6 use?
The C1000 D6 uses the Cummins QST30 -- a 30-liter, V-12 diesel engine. This is the same engine family as the C900 D6, calibrated to deliver the full 1000 kW (1 MW) standby output at the top of the QST30 power band.
What are the standby and prime ratings of the C1000 D6?
Standby rating is 1000 kW (1250 kVA) at 60 Hz, 0.8 power factor. Prime rating is 910 kW (1138 kVA). Both at 1800 rpm, 60 Hz, three-phase.
What are the service intervals for the C1000 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.
How does the C1000 D6 compare to the C1100 D6?
The C1000 D6 uses the QST30 (30L, V-12) while the C1100 D6 steps up to the QSK38 (37.7L, V-12) platform with MCRS fuel injection. The QSK38 provides more displacement headroom and a more advanced fuel system for the 1100+ kW class.
Can OnPoint Generators service the C1000 D6 in Northern California?
Yes. OnPoint Generators provides authorized Cummins service for megawatt-class diesel generators across the San Francisco Bay Area and Northern California. V-12 engines require attention to bank-to-bank balance during service. We use Cummins INSITE diagnostics for injector calibration and cylinder contribution analysis on every C1000 D6 service.

Compatible equipment

Transfer switches

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