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Model # 6439
MSRP: $2,509.00
Every Day Price: $2,457.00
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About Generac.com

Who is Generac?

Since 1959, Generac Power Systems has been designing and manufacturing backup power generators for residential, commercial and industrial applications. They have grown to be the world's largest provider of residential standby generators. Generac generators has revolutionized the commercial market with the first cost effective product line meeting the needs of small and mid-sized businesses.


Avg. Product Review Rating: 5.0/5 (based on 3 reviews - read reviews) Write a Review - $10 Store Credit

Generac Guardian 11kW Automatic Home Standby Generator 6439

  • True Power Electrical Technology
  • Two Line LCD Multi-Lingual Digital Evolution Controller
  • Transfer Switch Options Available
  • Electronic Governor
  • External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators
  • Sound Attenuated Enclosure
  • Flexible Fuel Line Connector
  • Composite Mounting Pad
  • Natural Gas or LP Gas Operation
  • 5 Year Limited Warranty
  • UL 2200 Listed


Generac Power Systems 6439 Details and Specifications

Generac's model 6439 standby generator produces up to 11 kilowatts of standby power for your home during a power outage. The standby generator is a permanent installation that works with an automatic transfer switch (sold separately) to start and run without operator intervention whenever power from the electric utility is interrupted, offering 24/7 protection against power outages, even when you are away from home.

Fuel Choices

Generac standby generators leave the factory ready to run on natural gas, but convert quickly and easily to LP gas (propane) during installation. The 6439 produces a full 11,000 watts of power when running on LP gas and 10,000 watts on natural gas. Fuel consumption on any generator is directly related to the electrical load and changes continuously. At half load, the generator consumes about 1.2 gallons of LP gas per hour, or 124 cubic feet of natural gas per hour.


Generac's commitment to reliable standby power begins with its overhead valve industrial engine, the only generator engine in its class designed specifically for use in a generator. The GH-530, electronic-ignition engine turns at 3600 RPM to deliver up to 18 horsepower. The 2 year or 200 hour interval between oil, filter, and plug changes provide for extended operation during long-term power outages. The oil system is fully pressurized for superior lubrication and cylinder rigidity is improved by the cast iron spiny-lok construction for long-lasting service and performance.

Evolution Controls

The Evolution Controller by Generac monitors the utility electric service. If the service drops or sags below an acceptable level, the controller starts the generator and signals the automatic transfer switch to move the home onto generator power. When the utility service returns, the controller reverses the process, runs the generator for a cool-down period, and then shuts it down. During operation it continuously monitors and controls engine speed and regulates the voltage output for utility grade power to operate even sensitive electronics and computers.

Also featured in the controller is a programmable exercise period to keep the generator lubricated and ready for operation at all times. The smart battery charger maintains the battery charge level and notifies the homeowner of imminent battery failures. The dealer programmable 2 to 1500 second start delay prevents false starts during momentary power outages. Other features include maintenance alerts and advanced fault detection and reporting.

Mobile Link is an optional accessory that provides alerts sent as text messages to your phone, and allows you to access your generator's controller via dashboard on computers, tablets, and smart phones from any Internet connection. Basic and advanced wireless monitors (also optional) install inside your home. The basic unit provides generator status, while the advanced model allows you to test the generator, receive status alerts, and control functions such programming exercise periods.

Generator Unit

The generator produces electricity with an advanced alternator that utilizes a revolving magnetic field and skewed stators. The design eliminates the need for brushes and provides better voltage and frequency regulation for superior quality power and greater surge capacity for starting heavy-duty motors. Better surge capacity allows air conditioner and other appliance motors to start with a momentary boost of power to get them turning.

Appearance and Noise

The 6439 standby generator fits into any neighborhood with a pleasing design and a 63db noise level that is lower than most central air conditioners. The unit is 48 inches wide, 25 inches deep, and 29 inches high with an all steel enclosure that resists corrosion, even in all climates, and meets fire protection standards. The hinged lid provides easy access to generator for maintenance and locks to prevent tampering.

Warranty Information

Manufactures Warranty: 5 Year Limited

Product Specifications

Model Number 6439
Manufacturer Generac Power Systems
Made In USA Yes
Rated Watts 11/10kW
Rated Amps 45.8 LP/41.7 NG
Voltage 120/240V Single Phase
A/C Ton Rating 3 Ton
Enclosure Steel
UL Listed Yes
Decibel Rating 63 db(A)
Starting System Automatic
Low Oil Alert Yes
Mainline Breaker 50 Amps
Hour Meter Yes
Battery Requirement Group 26R, 12V, 525 CCA
Mounting Pad Composite Base Attached
Product Weight 407 lbs.
Shipping Weight 451 lbs.
Dimensions (Inches) 48L x 25W x 29H
Engine Brand Generac OHVI V-Twin
Engine Size 530 cc
Engine RPM 3600
Cast Iron Sleeve Yes
Cooling System Air Cooled
Alternator Type Brushed
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type LP/NG
NG Power Capacity 10kW
LP Power Capacity 11kW
NG Consumption @ Full Load 195 cu.ft/hr
NG Consumption @ 1/2 Load 124 cu.ft/hr
LP Consumption @ Full Load 1.92 gal/hr
LP Consumption @ 1/2 Load 1.18 gal/hr
Transfer Switch
Transfer Switch Model Sold Separately
ATS Poles
Warranty Information
Consumer Warranty 5 Year Limited
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Product Reviews

  1. Life Saver

    Posted by Tunisia B. on 10th Feb 2014

    It came in handy when all the snow and freezing cold came all at once...

  2. Excellent Product

    Posted by Mike B. on 14th Jan 2014

    Purchased this product for a job that I was doing. Installation was easy and the costumer was very pleased with appearance of the unit and most of its performance. Definitely recommend Generac for all residential generator installations.

  3. Best Generator Ever

    Posted by Videogram on 10th Nov 2013

    I purchased this generator a few weeks ago. It was delivered quickly and a tracking number was given and easy to follow so I knew exactly when it was going to be delivered. The carrier called me 24 hrs before delivery and also called when the driver was a half hour away.
    Product was delivered in perfect condition and unit looks real good aside of my home. Can't wait until the next power outage.

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Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

Some restrictions apply to "Free Shipping" you may either view our
Shipping Information page or contact us for details.