Overview#
The Cummins C550 N6 is a 550 kW (688 kVA) standby natural gas generator set powered by the GTA28 gas engine -- a turbocharged and aftercooled spark-ignited engine. The unit runs on natural gas or propane vapor (field selectable) and is equipped with PowerCommand controls providing isochronous governing and AmpSentry alternator protection. It carries UL 2200 listing and EPA certification for stationary emergency use.
The C550 N6 serves large commercial and industrial standby applications including hospitals, data centers, large office towers, and manufacturing facilities. At 550 kW, it provides substantial emergency capacity while avoiding the fuel storage, permitting, and environmental compliance requirements associated with diesel generators of equivalent size.
Technical Specifications#
| Parameter | Value |
|---|---|
| Standby Rating | 550 kW (688 kVA) |
| Frequency | 60 Hz |
| Power Factor | 0.8 |
| Engine Model | GTA28 |
| Fuel Type | Natural gas / LPG |
| Cooling | Liquid |
| Aspiration | Turbocharged and aftercooled |
| Rated Speed | 1800 rpm |
| NG Fuel Consumption (Full Load) | ~5,500 CFH |
Our Service Experience#
The GTA28 gas engine is a proven platform at the 500-600 kW power level. The turbocharger adds a maintenance item that naturally aspirated gas units do not have -- we inspect turbo shaft play and boost pressure annually. Spark plug service on the GTA28 is straightforward but takes longer than smaller units due to cylinder count. The catalytic converter (where fitted) should be inspected during annual service for backpressure buildup.
Gas supply sizing is critical at 550 kW. The unit consumes approximately 5,500 CFH at full load, requiring a dedicated gas meter, adequately sized supply piping, and a high-capacity pressure regulator. Dynamic gas pressure must be verified at the engine inlet under full load -- undersized gas infrastructure is the most common installation deficiency we encounter on units in this class.
Frequently Asked Questions#
What engine does the C550 N6 use? The Cummins GTA28 -- a turbocharged and aftercooled spark-ignited gas engine rated for 550 kW standby at 1800 rpm.
What is the standby rating of the C550 N6? 550 kW (688 kVA) at 60 Hz, 0.8 power factor. Emergency Standby Power (ESP) rating.
What are the service intervals? Oil and filter at 500 hours or 12 months. Air filter at 500 hours. Spark plugs at 1,000 hours. Major overhaul at 30,000 hours.
Can OnPoint Generators service the C550 N6 in Northern California? Yes. OnPoint Generators provides authorized Cummins natural gas generator service across the San Francisco Bay Area, Silicon Valley, and Northern California.
