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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 1 out of 5 by from could not get phone support unit would not stay running and when I called tech support they told me to use a local service company. Called local company and was scheduled the next day. The technician came out and he had to call tech support and got no help. He finally figured out the problem. When the plumber hook up the gas line he disconnect something that keep unit from running. Paid $130 to local company for something that should have been simple to solve through an over the phone tech support.
Date published: 2018-10-12
Rated 5 out of 5 by from Good name good looking I love the way it looks and I like that it has a lock and the green light on the side to know it’s on. Peace of mind!
Date published: 2018-08-02
Rated 5 out of 5 by from Excellent backup system for home. Our General 20 kW gives us peace of mind. It was quickly installed and very easy program. I think we’ll strongly consider installing a unit at our winter home to support the solar when power goes out. For less than the cost of a hot tub we got a great deal of security. D&S Springfield, OR
Date published: 2018-06-27
Rated 5 out of 5 by from Generator meets our needs The Synergy generator started easily and is working as advertised. Generac needs to consider a more open info architecture so generator status can be output to home management systems, alarm systems, etc. The captive system using Verizon is of little use.
Date published: 2018-06-21
Rated 5 out of 5 by from Does exactly what I need it to do Not only does the Synergy 20kw run everything I need it to run, Its also more fuel efficient then the other generators I had looked at, and its quieter than the others. During the initial test when it was installed it only took 11 seconds to supply power to my house, Very happy with my purchase.
Date published: 2018-06-01
Rated 5 out of 5 by from Synergy This is a great generator,it determines the power needs and only uses that much gas power,saves gas and has smart modules to regulate performance. Highly recommend.
Date published: 2018-05-16
Rated 4 out of 5 by from Not part of promotions The unit is fine. It does what it's supposed too. However, if the promotion offered is your deciding factor for which brand to buy then this unit is not for you. Even though the promotion says "Buy a standby generator". They do not honor this claim for all models.
Date published: 2018-04-30
Rated 4 out of 5 by from Great Product but Promotion doesn't qualify Purchased the Synergy 20kw stand-alone automatic transfer unit which is their top of the line generator for Residential customers. Unit looks good, runs good, even if we haven't been able to use it during a power outage yet. One issue is with the Generac promotions. Generac is promoting a free portable Inverter generator with a stand-along unit purchase... which was a sell point to purchase their best unit. However this unit doesn't qualify for the promotion. It seems crazy that you buy/have installed the premium unit, but it doesn't qualify for the free inverter while other lower cost units do. After purchase, and after my promotional e-submission was rejected, I went into the fine print of the actual submission form and didn't see this model listed... but it wasn't clearly shown on the front of the web site that this unit doesn't qualify. Very dissapointed on the promotion, and I even got my neighbor to purchase same unit as well.
Date published: 2018-04-19
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20kW-7041 whole house switch is rated 4.5 out of 5 by 34.
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