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Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac
Cummins 20Kw Home Standby Generator W/ 200 Amp Transfer Switch Rs20Ac


Cummins 20kW Home Standby Generator w/ 200 Amp Transfer Switch RS20AC

Sale price$6,059.99
Was Regular price$6,401.00
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  • Brand: Cummins
  • Wattage: 20,000
  • Fuel Type: Natrual Gas or LPG
  • Item Weight: 596 lbs.
  • Voltage: 120/240V Single Phase
  • Included Components: Generator, Transfer Switch
Installation:No Installation
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Customer Reviews

Based on 4 reviews
Dana Carver
Very quiet and reliable power

Ordered and installed 20KW with 200 amp panel in Michigan 11-2021. Shipping was fast and arrived damage free on time. This unit is very, very heavy. Do not short cut on the site prep. I used a concrete pad on top of pea gravel and it has not settled. The transfer panel is large and has to placed in a area that is accessible. The transfer panel is 200Amps and MUST be matched to a 200 amp service panel that wired in your building. When power goes out the switch over to generator power is very short time, just a few seconds after it started. This generator is so quiet. We don't know its running in the house. We have a 4 ton air conditioner, well, sewer, grinder pump, hot tub, two fridges, all the normal appliances, lights, gas heat, gas dryer. The highest load was 48% of capacity. This unit is set up for ethernet remote monitoring which can be viewed from an app on your phone. It has 183 hours of time on it now and has worked perfectly during power outages. I have both this model at our primary home and a Generac Guardian at a remote Michigan vacation home. Overall they both work well, but prefer the Cummins due to being quiet and switch over time. Would recommend.

Aaron Whittington

Quiet and puts out great power

Damian Collia
Cummings 20kw with ATS

Ordering was quick and easy. Shipped promptly and arrived without damage. Haven't installed or run yet but I don't forsee any problems.

NoLi Enterprises


"Crank Only" Exercise Mode

Cold Weather Equipped

You can feel the security of having a global power leader in your own backyard with Cummins Home Generators. For more than 100 years, Cummins has powered everything from heavy-duty trucks to trains and tractors. We've provided dependable power generation to hospitals, data centers, and stadiums around the world.

Now you and your family can rely on that same expertise to get the latest in power technology with our generators for homes. Be prepared for bad weather, rolling outages, ice storms and more - and never lose your wi-fi or the contents of your freezer again.

This generator is designed to operate in cold weather with performance down to 0 °F (-18 °C) out of the box. The extreme cold weather models can perform down to -40 °F (-40 °C) out of the box. It is tested and certified per the latest EPA, UL, and CSA standards. The generator meets NFPA 37 which allows it to be installed 18 inches from a building. It has powerful motor starting ability and can easily start and run a 5-ton A/C¹ under full pre-load.

Remote monitoring is built into every generator. Using a computer, tablet, or smart phone, an operator can monitor, change exercise modes, and manually run the generator remotely.

Manufacturer Cummins
Model Number A065D231
Generator Grade Emergency
Generator Style Emergency Standby Generator
Generator Operation Fully Automatic (With Automatic Transfer Switch)


Engine/Motor Brand Cummins
Fuel Type Bi-Fuel: LP & NG
Starting System Automatic (With ATS)
Engine/Motor Type Air-Cooled, V-Twin, OHV
Displacement 999 cc
Engine RPM 3600 RPM
Generator RPM 3600 RPM
LP Consumption 50% Ld 68 Cubic Feet/Hour
LP Consumption 100% Ld 116 Cubic Feet/Hour
NG Consumption 50% Ld 205 Cubic Feet/Hour
NG BTU/Hour @ 50% Ld 205000
NG Consumption 100% Ld 300 Cubic Feet/Hour
NG BTU/Hour @ 100% Ld 300000
Enclosure Aluminum
Low Oil Shutdown/Alert Yes
Oil Cooler Yes
Lubrication System Automotive-Style
Engine Governor Electronic
Operational Volume (dB @23ft) 65.0
Overload Protection Yes
Exerciser Flexible
Altitude Affected Yes, Call For More Information


Transfer Switch Included
Transfer Switch Model RA200SE (A064G549, RA212S3)
Transfer Switch Style Automatic Transfer Switch
Voltage 120/240
Transfer Switch Amperage 200
Phase Single-Phase
Frequency 60 Hz
Service Entrance Disconnect Service Entrance Rated
ATS Enclosure NEMA 3R (Outdoor)


Fuel Supply Hose Included, 1', Flexible
Cold Weather Kit Included
Maintenance Kit Add @ Checkout
Mounting Pad Add @ Checkout
Battery For Electric Start Not Included


Warranty 5 Year Or 2000 Hour (limited)


Built In United States


Weight (Lbs.) 540
Ship Weight (Lbs.) 580
Unit Dimensions 53.0"Lx43.0"Wx34.7"H
Agency Compliance CARB (California), EPA
California Destination-Operators-Buyers Warning Click Here For California Proposition 65 Warning
Stk. Itm. No
Watts (LP Standby) 20,000.0
Watts (NG Standby) 18,000.0
Phase Single-Phase
Voltage 120, 240
Rated Amps @ Min Volt (Commonly 120v) 166.6
Rated Amps @ Min Volts (NG) 150.0
Rated Amps @ Max Volt (Commonly 240v 1-Phase) 83.3
Rated Amps @ Max Volt (NG) 75.0
Frequency 60 Hz
Poles 2
A/C Ton Rating 2 @ 5 Tons
Voltage Regulation +/-1.25%
Frequency Regulation 0% No Load To Full Load
Total Harmonic Distortion Less Than 5%
Circuit Breakers 100 Amp
Continuous Battery Charge Yes
Control Panel Display Yes, Wired In-Home LCD Display, Maintenance Reminder, Complete Gen-Set Monitoring And Protection, Proprietary Eletronic Control
Load Management Automatic Load Management @ Generator

Cummins QSJ999G Engine powers the RS20A home standby generator. Cummins, the world-class leader in diesel and natural gas engines, designed and built the propane or natural gas engine. The compact and sleek design allows you to safely install this generator just 18 inches from the home, and practically blends into the landscaping. This generator has a corrosion resistant aluminium casing with galvanized steel interior which redueds noice and vibration so sound levels are 65 dB(A) - one of the quietest in its class.

The cummins RS20A is prepared right out of the box for operation at temperatures down to zero degrees. Cold weather accessories can allow this generator to operate at temperatures far below zero degrees, which make a senesible addition to any home across the nothern united states.

This powerful motor allows the capability to start and run a 5-ton air conditioner while managing a full household load and allowing you to power sensitive electronics with less that 5% total harmonic distortion.


The RA Automatic Transfer Switch is integrated with the RS series genset. These products are Listed to UL 1008, the Standard for Transfer Switch Safety. The switch and generator set combination is specifically designed for a simplified, quicker installation.

The RA transfer switch monitors utility power 24 hours a day and 7 days a week. When utility power becomes unsatisfactory or fails; the generator set is signaled to start, then automatically transfers the load. When stable utility voltage returns, the transfer switch will automatically switch electrical load from the generator to the utility. No action is required by the home owner.

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