Katolight's larger units used Cummins NTA855, QSK, and MTU (Detroit Diesel) Series 60, Series 2000, and Series 4000 engines to cover the 200-2,759 kW range. These were the backbone of Katolight's industrial and mission-critical lineup, serving data centers, hospitals, water treatment plants, and large commercial facilities. The combination of proven engine platforms with Katolight's generator packaging and controls made these units a strong contender in the industrial standby market through the 1990s and 2000s.
Katolight was acquired by MTU (now Rolls-Royce Power Systems) in 2006, and the brand was phased out in favor of MTU Onsite Energy. Although no new Katolight units are manufactured, many large installations remain in active service with decades of useful life remaining. Cummins and MTU engine parts continue to be readily available, and the generator ends (typically Marathon or Stamford alternators) use standard industrial components. OnPoint provides full lifecycle support for existing Katolight large diesel installations, including preventive maintenance, major overhauls, control system upgrades, and emergency repair.