Cummins QSK Series Diesel Generators (QSK50 to QSK95)
The Cummins QSK series covers heavy-duty diesel generators for large and hyperscale standby power, including the QSK50 (around 1000 to 1500 kW), QSK78 (2500 to 3000 kW), and the QSK95 (2800 to 3500 kW), Cummins' largest genset. All offer Data Center Continuous ratings and PowerCommand paralleling for multi-megawatt arrays. Comp-Utility specs, installs, and services Cummins QSK generators across Central Texas.
What We Provide
Our Capabilities
Generator Sizing and Spec
We size and specify QSK units and multi-megawatt paralleled arrays for large and hyperscale loads.
Learn moreInstallation and Commissioning
We install, integrate switchgear and ATS, and prove the array with integrated systems testing.
Learn moreMaintenance and Testing
We maintain and load-bank test QSK units so large arrays perform reliably.
Learn moreScaling to Hyperscale
Multi-Megawatt Diesel for the Largest Loads
The QSK series extends from roughly 1 MW to 3.5 MW per unit, with the QSK95 as Cummins' largest genset, purpose-built for hyperscale data centers and multi-megawatt arrays.
Comp-Utility sizes, installs, commissions, and maintains QSK arrays, including paralleling switchgear and the testing that proves redundancy and load acceptance.
Key Specifications
| Model | Approx. rating | Role |
|---|---|---|
| Cummins QSK50 | 1000 to 1500 kW | Large mission-critical standby |
| Cummins QSK78 | 2500 to 3000 kW | Very large single-unit critical power |
| Cummins QSK95 | 2800 to 3500 kW | Largest Cummins genset, hyperscale |
| Ratings | Data Center Continuous (DCC) | Extended data center duty |
| Controls | PowerCommand 3.3, paralleling | Multi-MW arrays |
Specifications reflect the Cummins QSK series; exact ratings, models, and options vary. Contact us to confirm the current configuration for your project.
The Comp-Utility Difference
Why Comp-Utility?
Long-Standing Distribution Partner
As a long-standing distribution partner of Eaton, Schneider Electric, and Vertiv, we specify best-in-class systems and back them with factory-grade service.
Engineer-Owned and Operated
Comp-Utility is owned and operated by engineers, with licensed Texas Professional Engineers (P.E.) on staff. That rigor anchors every design, specification, and installation.
24/7 Emergency Response and Preventative Maintenance
Our technicians provide preventative maintenance programs and 24/7 emergency response, with rapid on-site dispatch across Central Texas when facilities need us most.
Turnkey, Single-Contract Partner
We sell, design, install, and maintain complete infrastructure end to end. One accountable team and one contract for power, cooling, distribution, and cabling.
Licensed, Certified & Recognized
We hold ourselves to the standards of the institutions we serve, from professional licensure and jobsite safety to the industry organizations that set the bar for mission-critical work.
Licensed Professional Engineers
State of Texas (TBPE)
OSHA 30 Certified
Field Technicians
AFCOM Member
Data center industry association
7x24 Exchange Member
Mission-critical infrastructure
Frequently Asked Questions
What does the Cummins QSK series include?
The QSK series includes heavy-duty diesel generators from roughly 500 kW to 3500 kW, with the larger members, the QSK50, QSK60, QSK78, and QSK95, serving large and hyperscale data center standby power. The QSK95 is Cummins' largest genset. All offer Data Center Continuous ratings and PowerCommand paralleling for multi-megawatt redundant arrays.
How do I choose among the QSK models?
Selection depends on your total load, redundancy target, and how you want to build the array, fewer large units or more smaller ones. The QSK50 suits roughly 1 to 1.5 MW per unit, while the QSK78 and QSK95 reach 3 to 3.5 MW. Comp-Utility models your load and designs the array size and unit count.
Is the QSK95 suitable for hyperscale data centers?
Yes. The QSK95, as Cummins' largest genset at 2800 to 3500 kW, is purpose-built for hyperscale data centers and gigawatt campuses, where its high single-unit output reduces the number of units in a multi-megawatt array. Comp-Utility designs hyperscale generator plants using QSK95 and other large units with paralleling switchgear.
Do QSK generators have data center ratings?
Yes. QSK series generators offer Data Center Continuous (DCC) ratings, reflecting their ability to serve data center load profiles for extended periods, which matters during long outages. Comp-Utility specifies the appropriate rating based on your runtime expectations and load profile.
Can QSK units be paralleled into large arrays?
Yes. PowerCommand controls enable seamless paralleling of QSK units into large, redundant arrays with synchronized load sharing. This is how multi-megawatt N+1 and 2N generator plants are built. Comp-Utility designs and integrates the paralleling switchgear and verifies the array through integrated systems testing.
How does the QSK series compare to Caterpillar and Kohler?
Cummins QSK, Caterpillar 3500-series, Kohler KD, and MTU Series 4000 are all leading large diesel platforms with overlapping capabilities and strong data center pedigrees. The right choice depends on sizing, standardization, parts and service support, and preference. As a vendor-agnostic provider, Comp-Utility compares them against your requirements.
What maintenance do QSK generators require?
They require regular oil, filter, and coolant service, fuel system and fuel quality management, starting battery testing, controls verification, exercising, and periodic load bank testing, with NFPA 110 expectations for life-safety systems. Comp-Utility builds and executes a maintenance and testing program for QSK units and arrays.
Who installs and services Cummins QSK generators in Central Texas?
Comp-Utility specs, installs, commissions, and maintains Cummins QSK series generators and the supporting switchgear and ATS across Central Texas, including load bank and transfer testing and 24/7 emergency response. Call (512) 346-0999 or email sales@comp-utility.com.