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Generac Guardian 6243 - ™ 17kW Aluminum Standby Generator System (200A Service Disconnect + AC Shedding) for sale.

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Generac Guardian™ 17kW Aluminum 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
9 Reviews
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  • Features
  • Specs
  • 17
  • 9
  • Articles
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Air Cooled Standby Generators
17 kW
Rated Watts
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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 Generac wireless monitors

Aluminum Sound-Attenuated Weather Proof Enclosure
Lightweight material offers superior corrosion resistance
Reduces sound pressure to a low 66 dB(A)
Attractive styling with lockable access doors

Automatic Voltage Regulator
Regulates ouput 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
12" flexible fuel line and manual included

5-Year Limited Warranty & 24/7/365 Customer Care

  Model Number:6243
 Manufacturer:Generac Guardian
 Made in USA:Yes
 Brand:Generac OHVI
 HP/CC:992 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 Capacity16,000 Watts
 LP Power Capacity17,000 Watts
 NG Consumption (50% Load)190 ft³/hr (BTU: 190,000 BTU/HR)
 NG Consumption (100% Load)312 ft³/hr (BTU: 312,000 BTU/HR)
 LP Consumption (50% Load)2.06 gallons/hr (BTU: 186,945 BTU/HR)
 LP Consumption (100% Load)3.57 gallons/hr (BTU: 323,978 BTU/HR)
 Rated Amps:71 Amps @ 240 Volts (Single Phase)
 Decibel Rating @ 7m:66 db(A)
 A/C Ton Rating4-Tons
 Mounting PadComposite (Included)
 Transfer Switch:Automatic (Included)
 Transfer Switch Amperage:200-Amps
 Transfer Switch StyleService Disconnect
 ATS Service Disconnect:Yes
 ATS Load Shedding:Built-In
 Battery:Not Included (525 CCA - Battery Group 26R)
 UL ListedYes
 Weight:437 Lbs. (198.22 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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  15 Questions
Q: 17 KW Generac, states inspect battery, replaced battery how do I clear the inspect battery from the maintenance log? Tried everything I could do on the screens, and went through the navigation menu Thank you
by Jim Biggers from New York on June 26, 2014

A: When the generator is shut down due to a latching alarm, the controller must be set to the "off" mode and the "enter" key pressed to unlatch any active fault and clear the corresponding fault alarm message.

Information is available in the owner's manual as to controller options. If you are unable to clear the code you will need to contact a local Generac servicing dealer for assistance.

Generac Service Dealer Locator

Please note that a common issue regarding a new battery/unit is improper installation where wire T1 is missing or not connected which causes the generator controller to operate off of battery power instead of the required 120V utility power provided by wire T1. It is also important to check the fuses inside the automatic transfer switch.

Also note that the "maintenance log" can only be cleared by a certified Generac servicing dealer as there is a password required to access special control menus within the controller.

by Mike, Product Expert

Q: Generac Guardian™ 17kW Aluminum Standby Generator System 200A Service Disconnect + AC Shedding Good afternoon! Am looking to place one of these for home use and will be using natural gas. I noted a 250 gallon recommendation for tank size for LP that also recommended for NG? We were actually looking to use a 100 gal. tank and a 25 gal. reserve....adequate?
by Timothy Terlep from Florida on June 06, 2014

A: It is not typical for natural gas tanks to be used in a generator application. Compressed natural gas has a much lower BTU output then compressed liquid propane so the tank size would need to be double what then what is needed for LP. A 17kW generator requires 323,978 BTU at startup and a 250 gallon propane tank can produce 507,600 BTU at 40 degrees F which is enough output to handle the starting requirement of the 17kW generator.

Your 100 Gallon tank, if LP was used, would only have about 215,000 BTU output at 40 degrees F and would not be enough output to start the generator and with natural gas the 100 gallon tank would only output a third or what LP produces.

Your best option would be LP as the fuel type if you need to use a tank and the true recommended size would be about 500 gallons so you have enough capacity to handle an extended outage without having to call the LP company to refill.

by Mike, Product Expert

Q: I have a 100 amp service at my house. Can I still install a 200 amp model at my house. I would like to purchase 17 kw . Second question is most of my breakers are 15 , I have one 40 for stove and 1 30 for dryer and 1 20 . I have central air and gas furnace. I am confused between your 17kw models 100 and 200 . Thanks Mark
by Mark from Michigan on June 04, 2014

A: Some inspectors allow a larger transfer switch because while on utility power the transfer switch is a pass through device only and the home is protected by its main breaker. It would be best to check with your local inspector or AHJ (Authority Having Jurisdiction) to verify you can do it.

The 16 circuit 100A transfer switch allows you to select specific circuits in your panel that you want the generator to run. You can adjust the transfer switch a little to match your circuit breakers. However, the breakers in the transfer switch can only go down in amperage and not up. Meaning you can change a 20A 120V breaker to a 15A 120V breaker or change the 50A 240V breaker to match your 40A 240V breaker on your stove/oven. These changes should be performed by a certified electrician.

Your other option is to purchase the generator by itself (Either Model 6248 or Model 6249) and then purchase the 100A whole house switch separately (Model RTSY100A3).

This would be your whole house solution if the inspector does not allow the 200A prepackaged switch.

by Mike, Product Expert

Q: For 6243 at 50% load using LP, how long will a 100 lb LP tank works as a back up?
by Julito Tejada from New York on February 09, 2014

A: Model 6243 uses 1.99 gallons of LP per hour operating at 50% load and would use 47.76 gallons in a 24 hour period.

The minimum recommended LP tank size is 250 gallons. A 100 gallon tank does not provide enough starting BTU output for the unit to run/start properly.

by Mike, 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 Mike, 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.....

by Mike, 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 Mike, 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 Mike, 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 Mike, 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 Mike, 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 is the link to review their info and pricing....

Generator Pads

by Mike, 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 Mike, Product Expert

Q: What is the run time on LPG tank for the generator?
by Ray More from California on September 06, 2013

A: Thank you for your inquiry!

The Generac Guardian home standby system does not include any for of fuel storage. As such, it is recommended to provide ample fuel for extended outages. The 17kw unit can consume up to 130CFH or 3.57 gal/hr at full load. As such, a minimum of 250 gallons on reserve is suggested.

by Mike, Product Expert

Q: I am going to install my generator on the side of my home. My electrical service is on the other side of the house. When I run the main power cables in pvc conduit, can I run either 14/3 or 12/3 romex in the same conduit as a control cable?
by Michael Napolitano III from New York on August 31, 2013

A: Thank you for your inquiry!

You will need to check with your local building department in order to determine what options you have for wire routing. Another valuable source for this type of information would be the NEC. Better known as the National Electrical Code, these guidelines have been adopted in accordance with the National Fire Protection Association in order to minimize risk and develop standards by which Electricians and Code Officials can go by.

It is usually recommended to separate the control wire and primary conductors. In such a long run, the heat transmitted by the primaries will be considerable and likely interfere with the control cable. As such, we would suggest that you adhere to the manufacturer's recommendation and route these separately.

by Mike, 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 Mike, Product Expert

Generac Guardian 6243 Reviews & Ratings
Write Review
Overall Rating
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
Easy To Install (1)
High Quality (6)
Reliable (6)
I'd Buy It Again (5)
Quiet (4)
Wish The Punch Out In Th... (1)
None Yet (1)
Expensive (1)
Heavy (1)
Low Quality (1)
89% of respondents would recommend this product to a friend
9 Reviews  Sort by 
Doit K.
New Milton, WV
Purchased from Power Equipment Direct
Purchased 10/16/13
Total Helpful Votes
13 Helpful Votes
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Just What I Wanted
I live in a section of West Virginia where the power was off for 10 days last year. To support a gas generator is not satisfactory and very expensive. I bought a Generac w Smart Box for peace of mind. It was very easy to install and worked like a charm from the get go. I do not see how this purchase could have been better.
Pros: Reliable, High Quality, Quiet, I'd Buy It Again
Doit Recommends This Generac Guardian Product
Doit Would Recommend Power Equipment Direct To A Friend
Web Site


"I am an aircraft Airframe & Powerplant mechanic. I installed the Generac myself. I would not recommend that a non professional electrician do that. I had to get advice from an electrician during the hookup. Secondly a non professional should not be messing around with the utility electrical service. I thought I was going to save money by doing it myself, but in the end I saved very little and was at risk. I recommend getting a licensed electrician to install the generator. If you touch the wrong wire at the wrong time it could be a disaster."
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Brent L.
Gettysburg, PA
5 out of 55 out of 55 out of 55 out of 55 out of 5
Money Well Spent
We live in an area that experiences outages frequently throughout the the year. In October 2013, we decided to purchase the Generac Guardian 17kW generator with the 200A Service Disconnect and AC Shedding and we're very please we did.

We had a very long and cold winter this year and in February 2014, experienced a bad ice storm and fridgid temperatures. Our area lost power for five days but we were living in our home as if nothing happened. Within 15 second after losing power, our... more
Pros: Reliable, High Quality, I'd Buy It Again, Fast
Brent Recommends This Generac Guardian Product
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Ron B.
Southwick, MA
Purchased from Power Equipment Direct
Purchased 10/2/13
4 out of 54 out of 54 out of 54 out of 54 out of 5
Warning Bad Generator
I have installed these for years, great value then Generac changed the fuel system and they run like crap. You're selling generators that should be recalled there is a service bulletin and repair parts needed. BIG disappointment to my customers and my reputation.
Pros: Quiet, Price
Cons: Low Quality
Ron Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
We thank you for the feedback and letting us know about your disappointment with these Generac generators. As with any mechanical product, there could always be issues. As an online, non-servicing dealer, we are not involved in any part of the service bulletin process. Because these generators are registered by the owner prior to start-up/operation, Generac will work with customers and local service centers if there's any issues regarding their specific model based on the serial numbers of the generator.
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Elliot G.
Islip Terrace, NY
Purchased from Power Equipment Direct
Purchased 9/16/13
4 out of 54 out of 54 out of 54 out of 54 out of 5
Generac 17k
Just finished the install. Plumber & Electrician very familiar with this product so everything went well. Feel very confident that when power goes out I will be covered.
Pros: Reliable, Features, Easy To Use, Quiet
Elliot Recommends This Generac Guardian Product
Elliot Would Recommend Power Equipment Direct To A Friend
Web Site


"From beginning to end it was a pleasure to deal with very organized, very professional."
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Stan K.
Honey Brook, PA
Purchased from Power Equipment Direct
Purchased 6/3/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Home Generator Stand By
Electric went out about week after install. It worked great. Very good investment.
Pros: High Quality, I'd Buy It Again, Price, Features
Stan Recommends This Generac Guardian Product
Stan's Experience With Power Equipment Direct
Web Site


"Fast shipping, great price and sales staff very helpful. Thank You"
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Clinton Y.
Sheridan, AR
Purchased from Power Equipment Direct
Purchased 9/30/13
5 out of 55 out of 55 out of 55 out of 55 out of 5
Bought For Peace Of Mind
I wanted a system that would backup my whole house. This unit seemed to fit the bill. So far so good.
Pros: Reliable, High Quality, Easy To Use, I'd Buy It Again
Cons: None Yet
Clinton Recommends This Generac Guardian Product
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Anthony P.
Boardman, OH
Purchased from Power Equipment Direct
Purchased 7/26/13
Total Helpful Votes
24 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Recent Power Outage
We have lost power recently about four times in the past month. Live in the country, the generator was a must for the peace of mind. Did it myself with the help of my friends. Instruction were good no problems. Now we wait to see when the power goes out how this baby really works.
Pros: Features, Quiet, High Quality, I'd Buy It Again
Anthony Recommends This Generac Guardian Product
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Karen S.
Exton, PA
Purchased from Power Equipment Direct
Purchased 7/17/13
Total Helpful Votes
21 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Bought The Generator From You & Installed For A Customer
Delivery caused the generator to be dented. Customer service was great and shipped a new one out the next day.
Pros: Price, Reliable, Easy To Install
Cons: Wish The Punch Out In The Ats Were There
Karen Recommends This Generac Guardian Product
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Adam R.
Livingston, NJ
Purchased from Power Equipment Direct
Purchased 8/27/13
Total Helpful Votes
16 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Piece Of Mind
That's what I bought. My generator tests itself every week. It sends me text messages telling me of status changes. I can look online and see the status of the generator as well. Have not had to use it, yet. Just a matter of time....

I have my piece of mind....
Pros: Durable, Price, Reliable, High Quality
Cons: Heavy, Expensive
Adam Recommends This Generac Guardian Product
Adam Would Recommend Power Equipment Direct To A Friend
Web Site


"Easy and problem free"
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Buy Generac Guardian™ 17kW Aluminum Standby Generator System (200A Service Disconnect + AC Shedding) at Power Equipment Direct. Read standby generator reviews and standby generator articles. Wide Selection of standby generator accessories available, including Generac Mobile Link™ Cellular Remote Monitoring System, Generac 6212 - Cold Weather Kit for Air-Cooled Home Standby Generators and Generac Guardian Maintenance Kit for 14-17kW Home Standby Generators (760/990cc) (2013+ w/ Evolution Controller).

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