When you need reliable backup power for your business or facility, the Cummins DFEK QSX15-G9 NR2 diesel generator stands out as a proven workhorse in the 500kW power range. This industrial-grade generator has earned its place in critical power applications across the country, and at Central States Diesel Generators, we’ve got several used units in stock that are ready to ship.

Let’s dive into what makes this generator such a solid choice, break down the technical specs, and explore why Cummins continues to be a trusted name in power generation.

Why Cummins Has Built Such a Strong Reputation

Cummins has been in the power generation business for nearly a century, and there’s a good reason why their name appears on generators at hospitals, data centers, manufacturing facilities, and critical infrastructure sites worldwide. The company’s reputation is built on three key pillars: reliability, durability, and comprehensive support.

What sets Cummins apart is their vertical integration approach. They don’t just slap their name on someone else’s engine – they design and manufacture their own diesel engines specifically for generator applications. This means better compatibility between the engine and generator components, which translates to fewer headaches down the road.

Their global service network is another huge advantage. When you buy a Cummins generator, you’re not just getting a piece of equipment – you’re getting access to parts and service support virtually anywhere in North America. That’s peace of mind you can’t put a price on when your facility depends on backup power.

Technical Specifications: What’s Under the Hood

The DFEK QSX15-G9 NR2 is engineered for serious standby power applications. Here’s what you need to know about the technical specs:

Power Output and Performance

  • Standby Rating: 500kW (625 kVA)
  • Prime Rating: 455kW
  • Voltage: 480/277V, three-phase
  • Frequency: 60 Hz
  • Power Factor: 0.8

This generator delivers substantial power output while maintaining excellent fuel efficiency. The 500kW standby rating makes it ideal for medium to large commercial and industrial applications.

Engine Specifications

  • Engine Model: Cummins QSX15-G9 NR2
  • Horsepower: 755 HP
  • Operating Speed: 1,800 RPM
  • Emissions: EPA Tier 2 compliant
  • Cooling: Engine-driven radiator system rated for 50°C/122°F ambient

The QSX15 engine series has been a reliable performer in Cummins’ lineup for years. Operating at 1,800 RPM provides a good balance between power output and engine longevity – it’s working hard enough to be efficient but not so hard that it wears out quickly.

Generator End Details

  • Generator: Stamford Newage 660kW oversized unit
  • Excitation: Permanent magnet
  • Design: Single bearing construction
  • Reconnectable Leads: 12 leads for voltage flexibility

The oversized generator end is a nice touch – having a 660kW generator producing 500kW means it’s not working at maximum capacity, which typically translates to better voltage regulation and longer component life.

Control and Monitoring

  • Control Panel: PowerCommand 2.3 digital system
  • Circuit Breaker: 800 Amp, 100% rated main-line breaker
  • Certifications: UL 2200 listed

The PowerCommand control system is user-friendly and provides comprehensive monitoring of all critical engine and generator parameters. It’s designed for both manual and automatic operation.

Physical Specifications

  • Dimensions: Approximately 188″ L x 86-88″ W x 117-121″ H
  • Weight: 16,879 to 17,000 lbs (depending on configuration)
  • Fuel Tank Options: Up to 850-gallon UL 142 sub-base tank available

Model Performance and Real-World Reputation

The DFEK QSX15-G9 NR2 has built a solid reputation in the field for several reasons. First, the QSX15 engine series has proven itself across thousands of installations. It’s not a brand-new design where you’re wondering about long-term reliability – this engine platform has been refined over many years.

Users consistently report good fuel efficiency and low maintenance requirements. The 1,800 RPM operating speed hits that sweet spot where the engine produces plenty of power without the high wear rates you might see with faster-spinning units.

The EPA Tier 2 emissions compliance is important for many installations, especially in areas with strict environmental regulations. While newer Tier 4 Final engines are available, Tier 2 units like this one often provide simpler operation with fewer emissions system components that could potentially require service.

What We Have in Stock and Ready to Ship

At Central States Diesel Generators, we currently have several used Cummins DFEK QSX15-G9 NR2 generators in our inventory with varying hours and configurations. Here’s what’s available:

Low-Hour Units

We have units available with as few as 372 hours of runtime. In generator terms, that’s barely broken in – many of these units have spent most of their lives in standby mode, only running for weekly exercise cycles and the occasional power outage.

Medium-Hour Options

For budget-conscious buyers, we also stock units with 500-660 hours of operation. Even at this hour range, these generators have plenty of life left. A well-maintained diesel generator can easily provide 20,000+ hours of service, so these medium-hour units represent excellent value.

Complete Package Options

Many of our in-stock units come with sub-base fuel tanks, weather-protective enclosures, and all the accessories you need for a complete installation. This can save significant time and money compared to sourcing components separately.

Why Choose Central States Diesel Generators

When you’re shopping for a used generator, the dealer you choose matters just as much as the equipment itself. Here’s what sets us apart:

Thorough Inspections: Every used generator in our inventory goes through a comprehensive inspection process. We check engine compression, load bank test the unit, verify all control functions, and document any issues before listing it for sale.

Transparent History: We provide detailed information about each unit’s service history, including maintenance records when available. No surprises after you buy.

Fast Shipping: With our logistics network, we can get your generator delivered quickly anywhere in the continental United States. Most in-stock units can ship within 1-2 weeks.

Technical Support: Our team includes experienced generator technicians who can answer your technical questions and help you choose the right unit for your specific application.

Applications Where This Generator Excels

The 500kW power output makes the DFEK QSX15-G9 NR2 perfect for several types of facilities:

Manufacturing Facilities: Provides enough power to keep production lines running during outages, protecting against costly downtime.

Data Centers: Reliable backup power for server farms and network operations centers where uptime is critical.

Healthcare Facilities: Hospitals and medical centers need dependable emergency power, and this generator delivers.

Large Commercial Buildings: Office buildings, shopping centers, and mixed-use developments can maintain essential systems during power outages.

Municipal Applications: Water treatment plants, emergency services facilities, and other critical infrastructure installations.

Making the Right Choice for Your Facility

Choosing a backup generator is a significant investment, and the Cummins DFEK QSX15-G9 NR2 represents proven technology at an attractive price point in the used market. The combination of Cummins’ engineering, the reliable QSX15 engine platform, and the comprehensive support network makes this an excellent choice for many applications.

Whether you need immediate backup power for a new facility or you’re replacing an aging generator, the used units we have in stock offer an opportunity to get proven performance without the new equipment price tag.

Ready to Learn More?

If you’re interested in learning more about our available Cummins DFEK QSX15-G9 NR2 generators or want to discuss your specific power requirements, we’re here to help. Our team can provide detailed specifications, arrange inspections, and help you find the right generator for your needs.

Contact us today to discuss your backup power requirements, or browse our complete inventory to see what other generators we have in stock and ready to ship. Don’t let the next power outage catch you unprepared – reliable backup power is just a phone call away.

For more information about different generator applications, check out our guide on continuous, prime, and standby generators to better understand which rating is right for your specific needs.