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Cumminsฎ Onanฎ Residential Standby Generator System RS12000

Clean, quiet, and neighborhood friendly, all ONAN residential generator models run on either propane or natural gas.

Cummins Onan Residential Standby Generator System RS12000. The redesigned model replaced the previous RS12000.  Powered by a Subaru EH 72, 4-cycle, air-cooled, 2-cylinders Over Head Valve engine the RS12000 is an ideal option, providing homeowners with quiet, high capacity clean power and access to real-time operational data

Package in aesthetically pleasing all-climate enclosure, the RS1200 offers power for a four-ton air conditioner while running at only 64 dBA at seven meters about same noise volume as a vacuum cleaner.

The system can be monitored and adjusted from a controller located inside the home and offers remote monitoring and service checks via the internet, providing an extra level of convenience. The polypropylene base reduces the need for a concrete slab base and the new service entrance rated transfer switch eliminates the need of a sub-panel, reducing installation costs.

Engine Features

• Transistorized magneto ignition

• Automotive-style lubrication system

• Oil cooler

• Spin-on oil filter

• Electronic governor

• Large-capacity air cleaner

• CARB Certified, EPA Certified

Control system

• Electronic control with self diagnostics and generator set protection and safety features included

• Automatically identifies power outage and starts generator

• Microprocessor control manages generator set operation, fault detection and service diagnostics

• Illuminated run/off/auto switch

• 50 A UL Listed circuit breaker

• Convenient access to all connection Weather protective sound enclosure

• Thick 11 gauge double wall aluminum enclosure with

resilient architectural grade powder coat paint

• Durable polypropylene base eliminates need for concrete pad

• UL Listed, impact resistant, fully colored, automotive grade polypropylene cover with UV stabilizer

• All maintenance points are accessible without the use of tools

• “Under the hood” oil dipstick check and fill

• Electrical stub-up and side knockouts provided on genset for installation flexibility

• Patented, innovative, compact and neighborhood


friendly design blends into any residential setting

- Rust proof design

- No exposed fasteners

- Key lockable

- High intake and exhaust to reduce rain ingestion and snow blockage


• Wired in-home LCD display is offered standard on every set.

• Reliably hardwired to genset battery and charging system.

• Easy set weekly exerciser clock.

• Start and stop genset from comfort of your own home.

• Displays maintenance and service reminders.

• Percent load is displayed allowing user to manage load.

Transfer switch (Sold Separately)

• 100 and 200 amp automatic transfer switch NEMA 3R.

• Fully automatic operation with Cummins Onan RSS model automatic transfer switch.

• Reduces installation time with indoor/outdoor flexibility and whole house install.

• Two amp trickle battery charger included

• UL 1008 Listed: Service Entrance Rated, RSS100-6868, RSS200-6869

• CSA Approved and UL 1008 Listed: RSS100-6634,


The Cummins Onan RS12000 home standby system comes with a standard two year/2,000 hour limited warranty. Warranty is valid on all RS12000 generators only when sold with Cummins Onan RSS model transfer switches. A one year/1000 hour warranty will apply if the RS12000 generator is used in an off-grid application or if it is used with any other transfer switch. The RS12000 generator set (12GSAA-6707) and RSS service entrance rated transfer switches (RSS100-6868 and RSS200-6869) are specifically designed to function together. Using any other product in conjunction with model RSS100-6868 or RSS200-6869 will void the warranty. The RSS standard transfer switch (RSS100-6634 and RSS200-6635) may be used with other generators.


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Last modified: April 17, 2010