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Synergy 20kW Home Backup Generator

Model #7040
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$5,299.00 MSRP Includes Transfer Switch - Installation, Taxes and Shipping Not Included Where To Buy Get a FREE
In-Home Assessment
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Premium whole-house backup power with patented G-Flex™ variable speed technology that matches engine speed to electrical demand.


Up to whole house protection with the 200-amp, NEMA 3R (aluminum outdoor enclosure) smart switch.

Unlike competitive units that run at a constant speed, patented G-Flex technology allows the Generac Synergy to run at lower speeds when household electrical demand is light. That means significantly quieter operation at normal capacity, less fuel consumption when you need less electricity, and cleaner power than competitive air-cooled home standby generators.

Generac generators and engines are engineered and built 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. Learn more about the G‑Force Engine »

5 Year Limited Warranty for automatic standby generators.

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.

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

Our RhinoCoat™ powder-coated finish helps make corrosion-resistant aluminum perfect for all weather conditions.

Mobile Link™ Remote Monitoring 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 the generator’s maintenance schedule. Connect your account to your authorized service dealer for fast, friendly and convenient assistance. (sold separately)

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 3 out of 5 by from Unit was defective. The is 20KW unit came with a crimped wire on the board which charges the battery. Waiting for a replacement board. Mobile Link app is terrible, after creating an account it cannot retrieve data and therefore is useless.
Date published: 2018-02-20
Rated 5 out of 5 by from At this point the product has performed as expected. The Generac Model that I selected was the Synergy Model due to its ability to produce a very minimal Harmonic distortion level. This is important for running the many computers that I am presently utilizing.. I have only used the system in a simulation - however, I was happy to find that the computers did successfully operate on generator with no major complications. That was the "deal maker" for me. At this point the Generac unit is operating exactly how I had planned. on it working during my research. The certified Generac installer was also excellent and made the task trouble free. The total project was a worthy investment. I would definitely recommend this unit for anyone that is using a large number or electronic components. You will have minimal interference.
Date published: 2018-02-17
Rated 4 out of 5 by from Love the Senergy The install went good except on starting the unit up. I got a fault code (1062) nothing in the manual about this code. it ended up with air in the gas line. Generac said call a repair service.
Date published: 2018-01-22
Rated 1 out of 5 by from Generator does not work Our new variable speed generator did not work and threw a code 1061 after a power outage last night. Has exercised like it should, it was installed professionally and is evidently defective from the factory. $6000+ invested. We are not very happy.
Date published: 2018-01-11
Rated 5 out of 5 by from Great product 20 KW Synergy is an awesome product. MUCH quieter than my 15 year old 10K. With whole house Transfer switch easily powers my entire home, including an electric oven and dryer. Highly recommend this generator.
Date published: 2018-01-01
Rated 5 out of 5 by from Great product, looks great, nice install and quite. Very pleased with overall project, went with the Synergy 20kw and pleased I did. Propane fuel should make it a very stable setup. Quieter operation, the motor should last longer since it runs at lower rpm's and use less full. Win, win, win for me.
Date published: 2017-12-16
Rated 3 out of 5 by from Activation retroactive I bought this generator to install myself because local dealers did not have any stock. It was purchased in September, 2017, from an authorized dealer, in Wisconsin, and shipped directly from the factory to me. When I installed and did its first activation, in December 2017, Generac recorded the activation date as the purchase date. If a local dealer had bought the same generator and sold it to me, the activation date would be the date is was installed and sold to me. I feel the warranty should begin on the date of activation and not date of sale.
Date published: 2017-12-14
Rated 5 out of 5 by from Great feature of adjusting engine speed based on load. I purchased a model 7040 Synergy Generac stand by power system for my residence. The feature of this model that I liked more above other Generac models is the feature of a slower engine speed when the load is smaller. This feature allows for less engine noise and less fuel consumption. I acted as my own general contractor in the installation process. I was able to save over $ 2,000 dollars on the total project estimate by hiring my own plumber and electrician. The instructions provided by Generac are written plain enough that a laymen can understand what is required. Moreover, the instructions are technical enough that the electrician and plumber know exactly what they are to do. My project turned out well thanks to the forethought of Generac.
Date published: 2017-12-13
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20kW-7041 whole house switch is rated 4.6 out of 5 by 24.
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