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The Generac Guardian™ 11kw standby generator system (200a service disconnect + ac shedding) is available for purchase today.

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Generac Guardian™ 11kW Standby Generator System (200A Service Disconnect + AC Shedding)

(Based on expert analysis, manufacturer ratings and customer reviews)

4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
15 Reviews
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  • Features
  • Specs
  • 13
    Q&A 
  • 15
    Reviews
  • Articles
  • Shipping
  • Accessories

Grade
Air Cooled Standby Generators
Style
Watts
11 kW
Rated Watts
Voltage
120/240V
Single-Phase
Fuel
Engine
OHVI
Need Help? Ask Our Generator Experts.


Smart Circuit Standby Generator System
Restores power to your entire electrical panel automatically
Digital Power Management (DPM) protects against overload

Generac Smart Switch™ (RTSY200A3 - Included)
DPM technology allows for the smart control of 2 air conditioners
Service Rated ATS: Mounts between meter and main service panel
200 amp aluminum indoor/outdoor (NEMA 3R) cabinet

Evolution™ Digital Controller
Provides system status to compatible Nexus™ wireless monitors

True Power® Electrical Technology - Provides less than 5% THD
Won't harm sensitive electronics & micro-chip based appliances

Automatic Voltage Regulator
Regulates output voltage to ±1% which prevents damaging spikes
Safe for sensitive electronics like computers and televisions

Generac OHVI Air-Cooled Engine
Full pressure lubrication system w/ 2 year oil change interval

Steel Enclosure w/ RhinoCoat™ Finish
Superior Weather Protection, Withstands up to 150 mph Winds
Lockable design & reduces sound pressure to a low 63 dB(A)

5-Year Limited Warranty


Model
  Model Number:6438
 UPC:696471064384
 Manufacturer:Generac Guardian
 Made in USA:Yes
Engine
 Brand:Generac OHVI
 HP/CC:530 cc
 Consumer Engine Warranty:5 Years
 Commercial Engine Warranty:5 Years
 Engine RPM:3600 RPM
 Low Oil Alert/Shutdown:Yes
Product Specs
 Voltage120/240 Single-Phase
 Frequency:60 Hertz
 Cooling SystemAir Cooled
 Fuel TypeLP/Natural Gas
 NG Power Capacity10,000 Watts
 LP Power Capacity11,000 Watts
 NG Consumption (50% Load)124 ft³/hr (BTU: 124,000 BTU/HR)
 NG Consumption (100% Load)195 ft³/hr (BTU: 195,000 BTU/HR)
 LP Consumption (50% Load)1.18 gallons/hr (BTU: 107,085 BTU/HR)
 LP Consumption (100% Load)1.92 gallons/hr (BTU: 174,240 BTU/HR)
 Rated Amps:46 Amps @ 240 Volts (Single Phase)
 Decibel Rating @ 7m:63 db(A)
 A/C Ton Rating2-Tons
 EnclosureSteel
 Mounting PadComposite (Included)
 Transfer Switch:Automatic (Included)
 Transfer Switch Amperage:200-Amps
 Transfer Switch StyleService Disconnect
 ATS Service Disconnect:Yes
 ATS Poles:2 Poles
 ATS Load Shedding:Built-In
 Battery:Not Included (525 CCA - Battery Group 26R)
Overview
 UL ListedYes
 Weight:407 Lbs. (184.62 kilograms)
 Dimensions:48"L x 25"W x 29"H
(121.92 x 63.50 x 73.66 cm)
 Consumer Warranty:5 Years
 Commercial Warranty:5 Years



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  13 Questions
Q: Can the Generac model 6438, with 200 amp transfer switch, be used in a home that has 100 amp service?
by Nicky from Maine on April 22, 2014

A: Per code it is ok to have a larger transfer switch installed in a whole house application because the switch is a pass through device only while on utility power because you are still protected by your main breaker.

However, some inspectors do not allow this and require the exact amperage size in a whole house installation.

This type of switch is installed immediately after the electric meter before your main panel allowing the generator to power your main panel just like your utility service would. As long as the generator is large enough to handle the entire electrical load at start-up.

by Jim, Product Expert
Q: Regarding the Generac 7kW fueled by Nat Gas . Spec states fuel consumption is 85 ft3/hr for 1/2 load. My question is what is this equivalent to in CCF?

by Ed from Pennsylvania on February 06, 2014

A: Natural Gas is usually measured by volume in the United States and is stated in cubic feet. A cubic foot of gas is the amount of gas needed to fill a volume of one cubic foot under set conditions of pressure and temperature.

To measure larger amounts of natural gas, "CCF" (centum cubic-feet) is used to denote 100 cubic feet, and "MCF" (mil cubic-feet) is used to denote 1,000 cubic feet.

With that said, due to the small amount of consumption you wouldn't convert the current ft3/hr to CCF.

However, if you are trying to calculate the cost in relation to therms listed by your natural gas company the conversion is 1000 ft3/hr equals 10 therms.

by Jim, Product Expert
Q: Would winter time installations of automatic generators be good or bad?

by Ron Mills from Michigan on December 30, 2013

A: You can install a generator at any time. However, it would be based on if you are putting down a concrete base as it will not set in cold temperatures. If you are putting down crushed stone or pea gravel it should be no problem.

You can also go with a GenPad (Gen Manufacturer Specific) which is a preform concrete base, so no concrete curing time. These can be installed in any temperature.

Generac GenPads

by Jim, Product Expert
Q: What does AC shedding mean?

by Dan Unkefer from Michigan on December 29, 2013

A: The following How-To-Library article will help explain AC Shedding.....

How-To-Pick-the-Perfect-Automatic-Transfer-Switch
by Jim, Product Expert
Q: I have a low pressure nat. gas line in my residence, what is the largest generator I will be able to run without doing major updates ?

by Chuck from Ohio on December 10, 2013

A: The Generac line of home standby systems can now operate on low pressure natural gas. Their low fuel pressure requirement is 3.5" to 5" of water column (1" of water column = 0.036 PSI).....0.123 PSI to 0.18 PSI. This would be for all sizes from 8kW up to 20kW.

Proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications such as commercial, all-electric homes, heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems.

by Jim, Product Expert
Q: If I'm not around when my home standby generator is running, what type of protections systems do the Generac units have?
by Josh from New Jersey on November 13, 2013

A: The generator may have to run for long periods of time with no operator present to
monitor the engine/generator conditions. Therefore, the generator is equipped with a number of systems to automatically shut down the unit to protect it against potentially damaging conditions. Some of these systems are as follows:

• Low Oil Pressure Sensor
• High Temperature Sensor
• Overcrank Sensor
• Overspeed Sensor
• RPM Sensor
• Under-frequency Sensor
• Undervoltage Sensor
• Overvoltage Sensor
• Internal Failure Sensor
• Low Battery Voltage Alarm

The control panel contains a display which alerts the operator when a fault condition occurs. The above list is not all inclusive. For more information about alarms and control panel operation, see Section 3 (Operation) in the owner's manual.

by Jim, Product Expert
Q: What type of oil should I use in my Generac home standby generator?
by Jim from Illinois on November 11, 2013

A: The maintenance section in the Generac's home standby owner's manual lists that the oil type is based on temperature ranges specific in your area.....

SAE-30 above 32º F (0º C)
10W-30 between 40º and -10º F (4º and -23º C)
Synthetic 5W-30 for all temperature ranges

All new models come with SAE-30 oil in them and have been test run at the factory for 25 hours and no break-in is required. The first oil change would be at 2 years or 200 hours, whichever comes first.

by Jim, Product Expert
Q: I'm not sure if this falls into the repair area but, I'm concerned about the sound this generator produces. Is there a way to lower that? Is there sound proofing approved for use for the interior walls of this type of home standby? My neighbors bedroom window will be 20ft from where I plan to install the generator. I would prefer doing something inside the generator as apposed to some type of fencing or other exsternal methods.

by Mark Hernandez from New Jersey on October 23, 2013

A: The manufacturers make every effort to reduce the sound of their generators as best they can keeping within NFPA and UL requirements. There are currently no options or parts available to install inside home standby systems to reduce their db(A) levels.

Your only option is location or sound barriers installed around the unit while keeping within NFPA and manufacturers distance requirements for proper fire protection, air intake and exhaust output.

We recommend consulting with your local inspector or AHJ (Authority Having Jurisdiction) as to the specific local code requirements.

by Jim, Product Expert
Q: Is the smart Switch the actual Automatic Transfer Switch? Or are they different? The specs says that there is an automatic transfer switch included. Also, I would like to know if a bottom pad for the generator included?

by Joseph Pylilo from New York on October 21, 2013

A: The "smart switch" is the automatic transfer switch. The ATS has an internal load manager that will load shed up to 2 AC units preventing the overload of the generator at start-up.

The generator does come with a composite pad already attached to the bottom of the unit (generator base) but a permanent base is required and can be either concrete, crushed stone or pea gravel with a minimum thickness of 3 - 4 inches.

We do offer the GenPad which comes in both 3 inch and 4 inch thickness...here is the link to review their info and pricing....

Generator Pads

by Jim, Product Expert
Q: I have a new 2013 Generac generator and I'm wondering what oil it came with? I would like to top it off properly after the installation.

by John from New Jersey on October 18, 2013

A: The Generac 2013 automatic standby generators are shipped with a SAE 30 non-synthetic oil. If you are located in an area that receives snow, it is recommended to perform an oil and filter change to switch to a synthetic 5W-30 oil to promote proper generator operation. The cold weather kit is also recommended.

The appropriate intervals for oil changes and other maintenance items will be located in the owner’s manual in the Maintenance Schedule.

Current production models do not require any break in, so if the Maintenance Schedule in the owner's manual indicates that oil changes only need to be done every 2 years or 200 hours, you could drain the existing oil and switch to synthetic 5W-30 right away.

by Jim, Product Expert
Q: What is the recommended time frame to change the break-in oil on my Generac 20kW generator?

by Karin Green from New Jersey on August 10, 2013

A: All of the new 2013 Generac Home Standby generators have been pre-run at the factory for 25 hours. So, no break-in period is required.

by Jim, Product Expert
Q: I just purchased a 11kW generator and would like to know the max distance that I can run 1/2 inch steel pipe to my generator?

by Spencer Aucoin from Louisiana on June 27, 2013

A: The fuel pipe requirements are:

Natural Gas:

1/2" - Cannot Use
3/4" - Max 20 Feet
1" - Max 85 Feet
1-1/4" - Max 370 Feet

Liquid Propane Vapor: (Note: Pipe sizes are using a second stage regulator)

1/2" - Cannot Use
3/4" - Max 70 Feet
1" - Max 255 Feet
1-1/4" - Max 1000 Feet

Natural Gas Pressure: 3.5 - 7 Inches Of Water Column
Liquid Propane Vapor: 10 - 12 Inches Of Water Column

***A properly sized gas pipe is critical to the proper operation of the generator. The generator inlet size has no bearing on the proper gas pipe size.***
by Jim, Product Expert
Q: What is the difference between the Generac model 6051 and their new model 6438 since they are about the same size?
by Jose from Illinois on May 28, 2013

A: Generac went ahead and improved on the design, warranty and ease of installation after listening to consumer reviews and technicians.

They bumped up the warranty an additional 2 years to give it a solid 5 year overall which is one of the highest rated on the market.

They improved on the generator controller by upgrading to a new technology and moved from their very good Nexus design to the new and improved Evolution controller. This new controller has a back-lit interface with LED's that shows the generator status at a glance.

The new Evolution controller includes maintenance reminders and logs, battery condition (no guessing) and over a half-dozen additional alarms the Nexus controller did not have. This thing rocks!

They upgraded the engine to include a no choke carburetor which helps with all weather starting. They changed the fuel selector for natural gas and LP to an easy knob that is easy to access and change fuel type with ease (No tools required).

For the installers they made several changes to help with installation costs and time, minimize errors and accommodate current and future electric code interpretations by re-engineered some of the wiring connections.

With the changes to the carb and engine they were able to change the low fuel pressure rating for Natural Gas down from 5" of Water Column to 3.5" of Water Column. This will help tremendously with low fuel pressure areas in the country so the meters do not need to be changed as often.

With all of these upgrades they have performed I believe Generac's newest model is one of the best out there and comes highly recommended.

by Jim, Product Expert
Generac Guardian 6438 Reviews & Ratings
Write Review
Overall Rating
Features
5/5
Quality
5/5
Performance
5/5
Value
5/5
Overall
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
Pros
Too Early To Tell (1)
Price (11)
Quiet (7)
Easy To Use (7)
Reliable (6)
Cons
Bad Instructions (2)
Wrong Instructions (1)
No Cons Whatsoever (1)
Poor Quality Control (1)
Key Locks Do Not Work (1)
93% of respondents would recommend this product to a friend
15 Reviews  Sort by 
 
Jim, the Generator Expert
Electric Generator Expert

Product Expert
Total Reviews
99 Reviews
Total Helpful Votes
2747 Helpful Votes
Electric Generators Direct Recommended

This new Generac 11kw new and improved, replacing the older 10kw model. This new model, 6438, comes with a 5 year warranty, which is a step up from the 3 year warranty on the previous model. Generac is so confident in the quality of their product they are stepping up their game.

The Evolution series digital controller allows for some really neat accessories. Wireless monitors are offered in 3 styles, basic status alerts, advanced wireless monitor or the mobile link system which allows you... more
Jim Recommends This Model
Was this review helpful?
907
John N.
New Bern, NC
Purchased from Electric Generators Direct
Purchased 7/2/13
Total Helpful Votes
41 Helpful Votes
Most Helpful Positive Review
REVIEWED
AUG.
04
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Just What I Needed
Just purchased this 11 KW Generac generator. My biggest problem was figuring out what size I needed to run my 3 ton AC. some websites said that an 11 KW would and some said that it would not. Electric Generators Direct said it would and they were right it will run my whole house.
Pros: Easy To Use, Quiet, High Quality, I'd Buy It Again
Cons: Bad Instructions
John Recommends This Generac Guardian Product
Was this review helpful?
412
Allain
Purchased from Electric Generators Direct
Purchased 7/24/13
Total Helpful Votes
18 Helpful Votes
Most Helpful Critical Review
REVIEWED
OCT.
03
2013
3 out of 53 out of 53 out of 53 out of 53 out of 5
Poor Quality Control
Some one along the quality control line did not check to see if the key locks that secure the generator enclosure lid worked properly.

One of the two lid locks was so tight it took a wrench to turn the key even after the lid was depressed to relieve the pressure on the lock. The second lock worked as it should but did NOT work with the spare set of keys supplied with the unit. I am worried now that this small issue is a sign of more serious quality control issues yet to come. Time will tell.
Pros: Too Early To Tell
Cons: Key Locks Do Not Work, Poor Quality Control
Was this review helpful?
188
Malcolm D.
North Kingstown, RI
Purchased from Electric Generators Direct
Purchased 6/5/13
Total Helpful Votes
44 Helpful Votes
REVIEWED
JUL.
03
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good Product
The generator arrived within a week. It was well packed. The installation was fairly easy (according to the Electrician & Plumber). It has only run on the weekly test so far and hopefully I will not need it very often, but cannot judge further until the power goes out!!
Pros: Features, Easy To Use, Price
Malcolm Recommends This Generac Guardian Product
Was this review helpful?
4411
Spencer A.
Amelia, LA
Purchased from Electric Generators Direct
Purchased 6/3/13
Total Helpful Votes
34 Helpful Votes
REVIEWED
AUG.
03
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Our 11 Kw Generac Gurdian Generator
We are truly satisfied with our new 11 KW generator. Setting generator onto location spot was not a problem, my 12 year old grandson and myself were able to do this. The electrical wiring was not a problem at all due to the manuals that come with the generator. Simple and easy to understand all the manuals and drawings.
Pros: Easy To Use, Quiet, Price, High Quality
Spencer Recommends This Generac Guardian Product
Was this review helpful?
342
Stefan H.
Lovingston, VA
Purchased from Electric Generators Direct
Purchased 7/15/13
Total Helpful Votes
39 Helpful Votes
REVIEWED
AUG.
26
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good Generator But
Consult with a Generac technician or electrician very familiar with generators as the instructions for this model are incredibly bad. Really bad.
I own a solar and electrical contracting company so generators are nothing new for us but Generac and this model prompted me to write a review because this is NOT a diy project. At least not with the instructions provided. By saying "adhere to local and NEC codes" for the electrical is lazy in my opinion and has nothing to do with... more
Pros: High Quality, Features, Reliable
Cons: Bad Instructions
Stefan Recommends This Generac Guardian Product
Jim, the Generator Expert
Product Expert
Stefan,
We always suggest having a generator installed by certified Generac installer.
more
Was this review helpful?
398
Richard J.
Honor, MI
Purchased from Electric Generators Direct
Purchased 9/9/13
Total Helpful Votes
15 Helpful Votes
REVIEWED
OCT.
22
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Completely Self Sufficient
This Generac is a stand alone system, selfsufficient, with minimal maintenance required. Exactly what we needed for living Up North with some crazy weather, with an occasional 3 day power outage and some road closures.
Pros: Easy To Use, Price, Fast, I'd Buy It Again
Richard Recommends This Generac Guardian Product
Was this review helpful?
151
Carl
Myers, CT
Total Reviews
3 Reviews
Total Helpful Votes
12 Helpful Votes
REVIEWED
JAN.
06
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
10 K Generac / Auto Transfer
We live in the upper, most wooded part of Connecticut. To say power outages here is common is an understatement. I lived with a gasoline 6800 watt unit for years. My wife could not put it into operation unless I was home. I finally said enough and purchased The Generac 10 K with auto transfer. Wow what a unit. It starts itself weekly, does its own trouble shooting, ,tells you when to change oil and starts weather I am home or not. My wife is ecstatic. Made points with her and I am happy too. Ya... more
Pros: Price, Easy To Use, Quiet, I'd Buy It Again
Carl Recommends This Generac Guardian Product
Was this review helpful?
121
Ken
Purchased from Electric Generators Direct
Purchased 11/19/13
REVIEWED
FEB.
13
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Generator
I bought one for my daughters house and installed it myself with no problems. Easy installation and good instructions. I liked it so well that I bought another one for my house to replace an existing generator. I think it is a great value for the money. I installed both my daughters and mine with the automatic transfer switch which on my old generator it was a manual transfer switch. Powers the whole house with no problem along with my well pump.
Pros: Price, I'd Buy It Again, Features, Exceeded Expectations
Ken Recommends This Generac Guardian Product
Was this review helpful?
60
Kenn H.
Volcano, CA
Purchased from Electric Generators Direct
Purchased 11/30/13
Total Reviews
2 Reviews
REVIEWED
FEB.
14
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac Has By Back
Moved back to the woods. 3500 feet elevation, lots of outages. Got on line, found you, caught a special & will live happily ever after. I just turned 79. I look out to see the little green lite all day long.
Pros: Price, Quiet, Reliable, Exceeded Expectations
Cons: No Cons Whatsoever
Kenn Recommends This Generac Guardian Product
Was this review helpful?
50
Dennis
Purchased from Electric Generators Direct
Purchased 8/31/13
REVIEWED
DEC.
11
2013
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac Guardian Best In Class
Real fast, my buddy has a Kohler. I was going to buy the same one. I'm a contractor here in NY on LI, mentioned it to my electrician who happens to be a Generac Dealer He showed me a few his company installed, the Generac's have way more over Kohler.

It's like buying a portable generator. Honda is the Best.
Pros: Durable, Easy To Use, Price, Exceeded Expectations
Cons: Wrong Instructions
Dennis Recommends This Generac Guardian Product
Was this review helpful?
83
Bill
REVIEWED
MAR.
19
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
-20 Below Started Right Up!
Had this baby installed last summer. Long cold winter in Illinois. One morning -20 below -35 below wind chill out goes the power! The Generac fired right up within 10 seconds and ran until power back on! Thank you Generac!
Pros: Price, Quiet, I'd Buy It Again, Reliable
Bill Recommends This Generac Guardian Product
Was this review helpful?
30
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We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
Priority Shipment
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Lift Gate Services
  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • $50.00 Service Charge
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Shop for the Generac Guardian™ 11kW Standby Generator System (200A Service Disconnect + AC Shedding) at Electric Generators Direct. Research Generac Guardian 696471064384 standby air-cooled generators online. Find Generac Guardian 6438 standby air-cooled generators & Guardian 11 kW 200A Standby features and specifications. Get the best deal; compare Generac Guardian 6438 prices now. Buy the 6438 direct and save.