A proven industrial engine, a complete outdoor-ready package, and just 522 listed hours make this used Cummins diesel generator worth a closer look. Central States Diesel Generators’ CSDG# 5204 is a 2014 Cummins DFEG rated at 350 kW standby and 315 kW prime, powered by the 15-liter QSX15-G9. It is offered for $69,900, located in Waukesha, Wisconsin, and listed FOB Waukesha.
The generator passed a load test on October 14, 2026, and its spec sheet, as-shipped report, and load test report are available from the product listing. CSDG owns the inventory it advertises, has other similar units in stock and ready to ship, and can arrange nationwide shipping.
Cummins reputation: a familiar name in industrial power
Cummins has built a global reputation in engines and power generation, supported by a broad service and parts network. For businesses choosing a standby generator, access to established technical support and a widely used engine platform can matter long after installation day.
The QSX15 is a heavy-duty industrial diesel designed for demanding power applications. Cummins’ QSX15-Series information and QSX15-G9 data sheet outline the platform’s engineering and ratings. Its long-running presence across generator and industrial applications reflects its appeal: substantial power, robust construction, and a design intended to respond quickly as electrical load changes.
Brand reputation is a useful starting point, not a substitute for evaluating a specific used machine. This unit’s hours, testing documentation, service history, and installation requirements should all be considered as part of a purchase decision.
QSX15-G9 engine: 15 liters of industrial capability
At the heart of this 350 kW diesel generator is a Cummins QSX15-G9 engine rated at 755 HP at 1,800 RPM. The QSX15 is a four-cycle, inline six-cylinder diesel with 15 liters (912 cubic inches) of displacement, a cast-iron block, turbocharging, and charge-air cooling. This configuration is designed to provide durable power and support rapid response when loads change.
The DFEG package is listed at 350 kW standby / 315 kW prime. Standby rating is for emergency power when utility service is interrupted; prime rating is the applicable continuous-use rating under the manufacturer’s specified operating conditions. The generator carries an EPA Tier 2 emissions classification. Verify local permitting and emissions requirements for the intended site before purchase.
Electrical features built for practical integration
CSDG# 5204 is configured for three-phase, 60 Hz, 277/480V service. Its 12-lead generator end can be reconnected to other voltages, subject to configuration and qualified installation. This flexibility can help accommodate different facility requirements, though the final voltage selection and site design should be confirmed with a qualified electrical professional.
The package includes a PMG (permanent magnet generator) and an oversized generator end rated at 450 kW. This alternator headroom supports demanding load conditions and strong motor starting, while the complete generator set remains rated at 350 kW standby and 315 kW prime. The oversized generator end does not increase the set’s published output rating.
An 800 Amp, 100% rated main-line circuit breaker provides the main disconnect and overcurrent protection. The set also has a PowerCommand 2100 digital control panel for generator monitoring and control. Additional equipment includes a 10 Amp EnerGenius battery charger and a coolant heater configurable for 208, 240, or 480 volts.
Enclosure and fuel tank for outdoor standby use
This Cummins DFEG has a weather enclosure and a 600-gallon UL 142 sub-base fuel tank with secondary containment. Together, these features make the package a candidate for outdoor installation and help support extended operation between fuel deliveries. Actual runtime depends on load, fuel consumption, usable tank capacity, and operating conditions; confirm the expected runtime against your facility’s load profile and emergency plan.
The listed dimensions are 87 inches wide by 189 inches long by 116 inches high, measured on 6-inch blocks. The generator weighs approximately 16,000 pounds. Before arranging delivery or installation, check access routes, lifting plans, foundation requirements, ventilation clearances, exhaust routing, fuel connections, and electrical integration.
Low listed hours, documentation, and value
With 522 hours on a 2014 unit, CSDG# 5204 offers a budget-conscious entry into the QSX15 platform. At $69,900, it may suit organizations seeking industrial backup power without the cost of a new generator. Low hours are an attractive detail, but they do not tell the whole story. On a used machine, maintenance records, storage conditions, calendar age, and inspection results are also important.
CSDG reports that this set passed a load test on October 14, 2026. Buyers can review the available documents directly:
Review the reports and confirm that the generator’s ratings, voltage, condition, and documentation meet your project requirements. A site-specific assessment should also account for load demand, transfer equipment, fuel planning, ventilation, and applicable codes.
Applications for a 350 kW standby generator
A 350 kW standby generator can be a fit for commercial buildings, healthcare clinics, light manufacturing, water treatment facilities, and telecom sites, depending on the connected load and backup strategy. It may supply critical systems or serve as part of a larger power plan. Proper sizing is essential: motor starting, HVAC loads, power factor, growth plans, and sequencing can all affect the capacity a facility needs.
If you are evaluating a diesel generator for sale, compare the set’s published ratings with your actual load profile, not just the largest number on a component specification. CSDG can help discuss the application and identify equipment that aligns with your requirements.
More Cummins and QSX15 generators in stock
CSDG# 5204 is not the only option. Central States Diesel Generators has other similar units in stock and ready to ship, including a new 500 kW Cummins DFEK QSX15-G9 generator, along with additional Cummins equipment. Browse the broader Cummins generator inventory, used diesel generators, and generator inventory to compare available models and ratings.
Because CSDG advertises equipment it owns, buyers can review real available inventory and make a timely decision. The team ships nationwide and can provide personalized guidance for businesses comparing capacity, condition, and package features.
Request details or a quote
Interested in this used Cummins diesel generator? Visit the CSDG# 5204 listing to review its photos and download the supporting documents. You can also contact Central States Diesel Generators to ask about current availability, request a quote, discuss shipping from Waukesha, or compare this 350 kW DFEG with other QSX15 units in stock.
