Since 1959, Generac has been designing and manufacturing backup power generators for residential, commercial and industrial applications. We have grown to be the world’s largest provider of residential backup generators, selling five times as many generators as all of our competitors combined. Generac’s broad product line is available through the industry’s largest network of independent generator dealers, retailers and wholesalers. To learn more, visit our About Us page or connect with us on Facebook, LinkedIn, Twitter, and Google+.

An automatic backup generator is a back up electrical system that operates whether you are home or away. Within seconds of an outage, it automatically supplies power directly to your home’s electrical circuit breaker box. After utility power returns, the generator shuts itself off and waits for the next outage. It operates on natural gas or liquid propane gas and sits outside just like a central air conditioning unit. See our "How It Works" video for more information.

During a utility power outage, an automatic backup generator provides numerous advantages over a portable generator:

• The American Red Cross recommends permanently installed backup generators as a safer way to provide backup power to a home than a portable generator.
• With an automatic backup generator properly installed outside, your home is protected from deadly carbon monoxide poisoning that is a much greater risk with portable generators.
• Running on the home’s natural gas or LP fuel supply, it is less expensive to run than gasoline and sources such as natural gas do not need to be refilled.
• They start automatically within seconds of a power outage, and eliminate the need to haul a portable generator outside or run extension cords throughout your home.
• They provide protection 24/7, whether you’re home or away, and they turn themselves off when utility power returns, so there is no need to monitor the unit during an outage.

The most logical way to determine your needs is to envision your home without power. Some outages may be short in duration, while others could last for days or weeks. What would your family miss during an outage? With some basic information, you can determine an estimated size by using our Generator Sizing Calculator.

The very best way to understand your options and work within your budget is to schedule a free in-home assessment. During your consultation, you will receive the personalized attention and detailed evaluation you need to find a solution that works for your need.

With the broadest product line available, essential circuit coverage starts with the economically priced Generac PowerPact™ Series. Other systems are available to cover virtually any application:

Essential Circuit Coverage – Generac takes the guesswork out of sizing by offering prepackaged Guardian Series generator systems. The generator is paired with a transfer switch containing a predetermined number of circuits based on the generator’s kW power rating. Each circuit is directly connected to a matched circuit on the home’s main circuit breaker panel, providing electricity to that specific appliance or area of the home.

Managed Whole House Coverage – You can get more coverage with less generator, up to whole house coverage, by pairing a smaller generator with one of Generac’s load shedding options. This creates a managed power solution where non-essential circuits are shed when the generator approaches maximum capacity. They are cycled back on when essential circuits no longer require power, so all circuits receive power at different times.

Complete Whole House Coverage – Easily cover every circuit in your home by pairing one of Generac’s larger kW units and the proper transfer switch to provide full coverage. No circuit is ever left uncovered, so every appliance is available every minute.

Explore our automatic home backup solutions

All generators require periodic maintenance, such as oil and filter changes to ensure maximum performance for years of reliable service. Scheduled maintenance kits are available and many Generac authorized dealers offer annual maintenance contracts for a worry-free ownership experience. We recommend you have your unit serviced every 6 months by an authorized independent service dealer. Refer to the owner’s manual for routine maintenance procedures and schedules. 

You can find a digital copy of your owner’s manual here

Important maintenance tips for your automatic home backup generator

Information about our fuel system inspection program​

Generac generators are equipped with overload protection. In the rare event of an overload, the generator’s circuit breaker will trip, disconnecting the unit from the load. Simply correct the overload and reset the breaker in the generator. For more information, please consult your owner's manual or contact us.

An SAE rated high detergent oil that meets API Service Class SF requirements for gasoline engines, similar to your car. In general, when the temperature is over 40 degrees F, the most recommended oil is a 30-weight detergent product.  When the temperature drops below 40 degrees F, you should use 10W-30.  Refer to your owner’s manual for details. To find your owner's manual online, visit our Product Support page and enter your serial number or model number. 

The engines! Air-cooled generators come with engines that use fans to force air across the engine for cooling, while liquid-cooled generators use enclosed radiator systems for cooling, similar to an automobile. Generally, liquid-cooled engines are used on larger kW generators due to the larger engines required for the higher power output.

Unlike other engines used in backup power generation, Generac G-Force engines are made specifically for generators. They are engineered to run for the long periods of time required during a severe power outage or on a job site, utilizing the same type of pressurized oil lubrication used to give automobile engines long and trouble-free lives.

Generac is one of the few companies to offer premium aluminum enclosures for its residential backup generators. Aluminum enclosures are naturally rust and corrosion resistant. For salt air or high humidity conditions, aluminum is highly recommended to ensure decades of worry free service.

No...the generator fuel costs would be much more expensive than buying power from the utility company since their cost to produce electricity is divided among thousands of customers. Our automatic generators are produced for use as backup to utility power specifically and should not be used as primary power. Please refer to the warranty policy for additional information. You can find a copy of the warranty on the Product Support page.

As an option, Generac offers the Guardian Series systems prepackaged and pre-wired with comprehensive installation instructions. You could perform the simpler site preparation steps and have a professional make the electrical panel and fuel connections, or you could complete the entire installation yourself. However, for safety reasons and to ensure adherence to all local, state and national electrical codes, particularly for non pre-wired or larger systems, Generac recommends you use an authorized Generac dealer or licensed contractor. When selecting a site, always follow the guidelines in the Site Selection and Preparation section of your unit’s installation manual.

Most portable generators do come with a rechargeable battery. However, our standby units do not. But don’t worry about where to find a battery—a standard car battery you can get at your auto parts store will be compatible.

This is a maintenance reminder light. You can reset the light by pressing the Enter key on the control panel. Service reminders include inspect battery, change oil and filter, change air filter, inspect spark plugs, and change spark plugs.

Owner’s manuals and other documentation can be downloaded from our Product Support Page  using the unit's serial number, or contact us for further assisance.

Any Authorized Generac dealer can perform warranty service. To find your local authorized Generac dealer, see our locator or contact us for additional information. Our Authorized Service Centers provide parts, service, and information on Generac equipment, regardless of where it was purchased. Authorized Service Centers are staffed with trained technicians certified in supporting all aspects of the Generac automatic standby generator line.

We recommending contacting your gas provider, or a licensed plumber, and they will be able to size the gas line for you. Gas pipe size will depend on length of run from the source and how many elbows and T’s there are. 

Every home is different, and so is every installation. The placement of the generator, the amount of materials required, and the installation of the natural gas or LP fuel source all make estimating installation costs unique. A simple installation might cost about $2,000, but it can be more than that depending upon your specific situation. The best way to know for sure is to get a free in-home assessment. They will listen to your needs, assess your home, and give you a detailed quote. All at no charge, with no obligation, and no pressure.  We also encourage you to use our Sizer Calculator to make sure you are getting the generator that is best for you and your needs!  (Note: installation cost estimate shown does not include taxes and permits.)

No, the cost of the Generac home backup generator does not include installation.

Every home is different, and so is every installation. The placement of the generator, the amount of materials required, and the installation of the natural gas or LP fuel source all make estimating installation costs unique. A simple installation might cost about $2,000, but it can be more than that depending upon your specific situation. The best way to know for sure is to get a free in-home assessment. They will listen to your needs, assess your home, and give you a detailed quote. All at no charge, with no obligation, and no pressure.  We also encourage you to use our Sizer Calculator to make sure you are getting the generator that is best for you and your needs!  (Note: installation cost estimate shown does not include taxes and permits.)

No.  Our Generac home backup generators are designed to run on one fuel source.  They are factory set to run on natural gas, however; at the time of installation, your generator can be reconfigured to run on liquid propane.  

We recommend at least 250 gallons for our Generac automatic standby units.  However, every home is different, and so is every installation and set-up.  We recommend that you get a free in-home assessment to help determine the best set up for your needs.  In-Home Assessments are available to you at no charge, with no obligation, and no pressure. 

We also encourage you to use our Sizer Calculator to make sure you are getting the generator that is best for you and your needs!