Guardian 18kW Home Backup Generator

Starting At

$4,939.00 Transfer Switch, Installation, Taxes and Shipping Not Included Where To Buy Get a Free Quote What is an In-Home Assessment?



Provides essential circuit power protection for your home, ensuring the necessities remain powered during an outage or up to whole house coverage when paired with one of Generac’s load- shedding switches. Capable of backing up a five ton air conditioner.


5 Year Limited Warranty for automatic standby generators.

True Power™ Technology delivers best-in-class power quality with less than 5 percent total harmonic distortion for clean, smooth operation of sensitive electronics and appliances.

Generac generators and engines are engineered and assembled in the USA*.
*Assembled in the USA using domestic and foreign parts

Generac's G-Force Engine is a purpose-built, pressure-lubricated engine capable of handling the rigors of generator use, resulting in power that’s more reliable and requires less routine maintenance than any competitive engine.

24/7/365 Customer Support Team standing by all day, every day from our headquarters in Wisconsin to answer any questions you might have.

Quiet-Test™ Self-Test Mode runs at a lower RPM for a five or twelve minute test, making generators significantly quieter than other brands while consuming less fuel.

Tough, Durable All-Aluminum Enclosures: Our RhinoCoat™ powder-coated finish helps make corrosion-resistant aluminum perfect for all weather conditions.

Smart, User-Friendly Controls.  Generac’s Evolution™ Controller features a multilingual LCD display that allows users to monitor battery status and track maintenance intervals to ensure your generator is always in top operating condition.

Mobile Link™ Remote Monitoring FREE with every Guardian Series Home standby generator allows you to monitor the status of your generator from anywhere in the world using a smartphone, tablet, or PC. Easily access information, such as the current operating status and maintenance alerts. Learn more about Mobile Link

Home Generator Resources

The purchase of a home backup generator will give you peace of mind for years to come, but it’s a big investment. That is why we want to give you as much information as possible so you can make the right decision based on your needs and budget. The options below will help you understand how the entire process works, what your financing options are, and how to choose the right backup power solution.


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Rated 5 out of 5 by from Gives us peace of mind The last few years we have experienced more frequent power outages. Having the generac gives us piece of mind that we will be covered for our power needs. DS Groff out of Lewis Run, PA was our dealer/installer. Mr. Groff came to our house and discussed our options. Jethro and Ray were our installers. They did a very neat and professional instal in a matter of a few hours. Everybody from the lady who answers the phone at Groff, Mr. Groff and our installers were great. I would highly recommend !
Date published: 2023-09-07
Rated 5 out of 5 by from Great product We are very happy with our recent purchase of the 18KW Guardian compatible Wifi and it was just fantastic to hear for the first time the noise coming from outside in a matter of seconds after a recent power outage. No more worries for getting water in our basement, just peace of mind from now on. Plus, no more freezing in the winter, especially after experiencing up to 17 days without electricity.
Date published: 2023-09-05
Rated 5 out of 5 by from Just purchased this unit and we were very happy with the sales and installation process from our Generac Dealer, Offgridderz Inc. Our Generac dealer guided us in giving the information we needed to make a decision that was right for us. The installation process was quick and easy. Although we hope we don't need to use this product too much, we feel safe and comfortable knowing that it is there.
Date published: 2023-08-29
Rated 5 out of 5 by from Outstanding unit. Exceptional expert installation. This unit seems to be outstanding (not actually used yet) and a great value. The installation was very smooth and the team was very professional and did exceptional work.
Date published: 2023-08-29
Rated 5 out of 5 by from Exceptional quality, service and installation We had Casey Mechanical install our 18KW generator last spring and have nothing but good things to say ever since! They arrived on time and installed the custom General pad and generator as purchased. The install was seamless as has been its operation. We have lost power in bad weather, ice storms and due to hydro problems but we have not had to go without power since it was started up. Generac and Casey Mechanical make a great team!
Date published: 2023-08-25
Rated 5 out of 5 by from Great product, great installation I did a lot of research into backup generators, some had a few more bells and whistles so was the cost. From what I found Generac stood above them all. The 18Kw will meet out needs. We went through ESCON Power Solutions, Bay City, MI for the purchase and installation. They went above and beyond to make sure the installation was done correctly (a couple of unplanned challenges were found during the installation). I highly recommend them if you are looking for a Generac dealer.
Date published: 2023-08-20
Rated 5 out of 5 by from Professional job Installation team arrived when stated, and flawlessly installed generator and connection to house. Very impressed with their attitude, skill and how well they kept everything clean especially after rain and mud. Well done.
Date published: 2023-08-18
Rated 5 out of 5 by from Professional product Professional product, fair price, and quality materials.
Date published: 2023-08-18
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18kW-7228 Whole House Switch WiFi-Enabled is rated 4.9 out of 5 by 127.
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