20kW Air-Cooled Residential Standby Generator, Quiet Connect Automatic Power System

The Cummins Quiet Connect RS20AC is a permanently installed standby generator designed to deliver automatic whole-home backup power during outages. Operating on natural gas or propane, it restores electricity within seconds of utility interruption—without manual startup.

Built with a corrosion-resistant aluminum enclosure and heavy-duty internal components, the RS20AC is engineered for long-term outdoor installation. Its fully enclosed, sound-attenuated housing provides reliable year-round operation in standard residential climates.

What About Cold Weather Operation?

The RS20AC includes standard all-weather capability for typical residential climates.

For colder regions, an optional Cold Weather Kit can be added to improve winter starting performance and overall reliability.

Why Pair a Generator with an Automatic Transfer Switch?

An automatic transfer switch (ATS) detects outages instantly, transfers electrical load safely, prevents backfeed into the utility grid, and restores utility power when service returns.

When combined, the generator and ATS create a fully automated backup power system.

Key Features

• 20kW standby output on liquid propane

• 18kW standby output on natural gas

• Air-cooled 999cc Cummins V-Twin OHV engine

• Field-selectable fuel type (NG or LP vapor)

• Service-entrance transfer switch included

• Sound-attenuated aluminum / steel enclosure

• Quiet operation (approximately 65 dB(A) at 7 m)

• < 5% Total Harmonic Distortion (THD)

• Safe for sensitive electronics

• Patented crank-only exercise mode

• Programmable exercise scheduling

• Load management capable (kit sold separately)

• Cummins Connect Cloud remote monitoring compatible

• Cold-weather equipped for operation down to 0°F

Electrical Specifications

• Rated Output (LP): 20,000 watts

• Rated Output (NG): 18,000 watts

• Voltage: 120 / 240V

• Frequency: 60 Hz

• Amperage: 83A (LP) / 75A (NG)

Fuel Consumption

Natural Gas

• 205 ft³/hr @ 50% load

• 300 ft³/hr @ 100% load

Liquid Propane

• 2.0 gal/hr @ 50% load

• 3.0 gal/hr @ 100% load

Engine & Operation

• Engine displacement: 999cc

• Engine speed: 3600 RPM

• Cast-iron cylinder sleeve

• Automatic low-oil pressure shutdown

• 12V automatic start system

Physical Specifications

• Length: 34-1/8"

• Width: 36"

• Height: 27-5/16"

• Weight: 540 lbs

• Cooling: Air-cooled

• Enclosure: Aluminum / steel