CUMMINS RS17A Features: The RS17A runs with a powerful, naturally aspirated, V twin air-cooled engine. The engine and motor start and run the generator with enough power to handle a 5-ton A/C unit. Rated at 70.8 NG / 70.8 LPV amps. This, like all units in the series, is a very quiet generator—65 dB (A) within 23 ft. (7 m) at a normal load.