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Model # 6438
MSRP: $2,999.00
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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.


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Generac Guardian 11kW Standby Generator Pre Packaged with 200 Amp Service Rated ATS 6438

  • True Power Electrical Technology
  • Two Line LCD Multi-Lingual Digital Evolution Controller
  • Includes 200 Amp Service Rated ATS with Digital Power Management technology (DPM) NEMA 3R Rated
  • 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 6438 Details and Specifications

With 11 kilowatts of standby emergency power, the Generac 6438 with its 200-amp, service-entrance rated automatic transfer switch is a permanently installed solution to the threat of power outages. Even if you are not home, the 6438 will sense an outage and start up, and then signal the Smart Switch to move your home onto backup power, ensuring your peace of mind while it protects your home from sudden and unexpected power interruptions.

Fuel Choices

Generac ships the 11kW standby generator ready to run on Natural Gas. Conversion to LP Gas (propane) is simple and performed during installation. The generator can supply 10,000 watts of power on natural gas, and a full 11,000 watts on LP Gas. Fuel consumption varies with the electrical load placed on the generator, which can vary continuously. At half load, the engine will use 124 cubic feet of natural gas per hour, and 1.2 gallons of LP gas per hour.


The 18 horsepower GH 530 is an overhead valve industrial engine specifically designed by Generac for use in its standby generators. It runs at at a constant 3600 RPM to produce a steady 60 hertz voltage. With a fully pressurized oil system and cast iron cylinder walls for a long life, along with a 2 year, 200 hour interval between oil changes, the engine can supply power during extended outages or for just a few hours with minimal maintenance.

Evolution Controls

With Generac's Evolution Controller, the standby generator is ready to run at a moments notice. The controller monitors utility power and senses an outage immediately. After a 10-second delay (dealer programmable from 2 to 1500 seconds), the controller starts the generator, waits five seconds, and signals the transfer switch to begin supplying power from the generator instead of the utility.

During operation, the Evolution continuously monitors and regulates the voltage and the engine speed to produce electrical power as good or better than utility power. The smart battery charger keeps the battery at peak capacity and warns the homeowner when the battery is in danger of failing. Sophisticated fault detection and reporting along with maintenance alerts keep homeowners informed of generator status. A color-coded membrane keypad and bright LED indicator lights make using the control panel easy.

An optional feature called Mobile Link keeps you connected with text messages on your phone for status and maintenance alerts. Mobile Link also gives you remote access to the controller via an online dashboard you can access from a computer, tablet, or smart phone.

The optional basic and advanced wireless monitors install effortlessly inside your home to provide you with generator status. The advanced monitor allows you to setup generator exercise periods, view maintenance alerts , or test the generator.

Automatic Transfer Switch

The 6438 includes the 200 amp Smart Switch by Generac. The smart switch is a service entrance rated switch that installs between the electric utility meter and the home's main service panel. During normal operation the switch sends utility power to the main panel. When an outage interrupts power, the switch moves the house onto standby power from the generator. Digital Power Management technology allows the Smart Switch to manage two air-conditioner loads without adding hardware, and up to four additional high-voltage loads with the addition of Power Management Modules.

Generator Unit

The generating unit's revolving magnetic field with stationary, skewed stator design allow superior voltage regulation under constantly changing electrical loads and a high surge capacity for starting large motors. The brush-less generator supplies clean power that is free from noise with a smooth, regular waveform and suitable for powering electronic devices such as computers and other electronics.

Appearance and Noise

Generac's model 6438 is designed to fit into any neighborhood. The corrosion resistant enclosure is made from steel with tough, powder-coated paint to last for years―even in all environments. This model is 48 inches wide, 25 inches deep, and 29 inches high, and produces less noise than the average central air-conditioning unit for a neighbor friendly installation in most urban areas.

Product Videos

What is a Generac Automatic Home Standby Generator (01:47)
When the power goes out even if its just for a few hours life is disrupted
  • What is a Gene...
    When the power goes out even if its just for a few hours life ...

Warranty Information

Manufactures Limited Warranty: 5 Years

Product Specifications

Model Number 6438
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 Tons
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 477 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./hr
LP Consumption @ Full Load 1.92 gal/hr
LP Consumption @ 1/2 Load 1.18 gal/hr
Transfer Switch
Transfer Switch Model RTSY200A3
Transfer Switch Amps 200 Amps
Transfer Switch Circuits Service Rated - Whole House
ATS Poles 2
Warranty Information
Consumer Warranty 5 Year Limited
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Product Reviews

  1. Super fast shipping great product Excellent Customer service

    Posted by Felix on 1st Nov 2014

    Ordered .....10 Days later in my driveway ...easy install....easy to follow set up and operation. Have not needed to use it yet but my neighbors liked it so much they are ordering one

  2. Easy from start to finish

    Posted by Gary Vondauber on 22nd Sep 2014

    The purchase of the 11kw generac was a great from order to delivery. The price through Norwall was up watched and it was delivered just as expected. They say it's going to be a rough winter..... Bring it on.

  3. A Great Product. Just Purchased One For My Parents

    Posted by James Goldsberry on 27th Jan 2014

    After buying one for my self in 2011, I convinced my mother in-law to do the same. We both have been very happy with how easy it is to use. You don't have to do anything. So this week when my parents decided it was time, I ordered one for them. If I didn't think they are dependable, I wouldn't be ordering a third one!!

  4. Second Purchase from Norwall!

    Posted by John Kaiser/Yacht View Brokerage LLC on 29th Nov 2013

    This is the second new construction that I have general contracted and I am very pleased with the level of service and product knowledge my salesperson Sharon has provided me with. Thanks for making this process so easy and well discounted!

  5. Piece of mind

    Posted by Matt A. on 6th Sep 2013

    Installed 2 weeks ago on LI. Power went out last week and it worked perfectly. Was pleased with the look and sound level. I used and recommend the genpad which makes for a nice finished look. One nitpick is that I had to buy the base cover separately. It comes with the 20KW unit, but not the others.

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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.

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