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Electrical Division


Why own a generator?

Now you have it. Now you don't. From snow storms to accidents, tens of millions of Americans lose electrical power to their homes each year. No warning - just no lights, no heat, no air conditioning. No refrigerator, no sump pump, no security system. A few hours without power is a nuisance. Losing power for days, weeks or even longer can be costly and downright dangerous.

A Generac® automatic standby generator returns your home to full power within seconds, 24/7, even when you're not at home. More convenient than a portable unit, a fully automatic Generac standby generator senses an outage and begins to produce power immediately. There are no extension cords to plug in, gas tanks to fill, or switches to flip. A Generac generator delivers the power you need, the security and peace of mind you want.

Why Generac?

When it comes to protecting your family — and your property — from power outages, you want nothing less than the best. That's why 4 out of 5 homeowners turn to Generac when purchasing an automatic home standby generator for their homes.

Generac didn't get to be number one by being like everyone else. Power generation is their only business — and has been for nearly half a century.Their products provide the highest quality, the best reliability, the most advanced features and the best value in the industry.

While some companies just assemble product, they design and manufacture their own air-cooled engines, alternators, enclosures, control systems, transfer switches and communication software. With Generac, you get a fully integrated standby power system in which every component is perfectly matched.

They control every aspect of the manufacturing process and production test every unit to ensure the highest quality and complete customer satisfaction. High volume production, along with advanced manufacturing technologies and processes, allows them to keep costs under control and to pass the savings along to you in the form of the lowest prices in the industry.

That's why Generac sells more automatic home standby power systems than all other manufacturers combined. With so much at stake, don't settle for less than the best.
How it Works

Generac Standby Generators are completely automatic, helping to ensure that your home or business remain safe from the negative and potentially harmful effects of power loss.

1. The Generac system automatically and continuously monitors incoming power from the utility line. 

2. When utility power is interrupted, the control system in the generator automatically senses the loss of power and signals the generator to start.

3. The automatic transfer switch safely closes off the utility line and simultaneously opens a new power line from the generator.

4. Your Generac generator supplies electricity to your main distribution panel through an automatic transfer switch. You can elect to back up selected emergency circuits or your entire electrical service.

5. When utility line voltage returns, the system transfers the electrical load back to the utility line. The generator continues to run for an engine cool-down period of several minutes and the entire system stands ready for the next power outage.

To ensure the system is always ready when you need it, your generator will run a 10-12 minute self-test cycle every week.

Frequently Asked Questions

What is an automatic standby generator?

An automatic standby generator is a back-up electrical system that operates whether you are at your property or away. It automatically supplies power to your home or business within seconds of a utility outage. When utility power returns, the generator shuts itself off and awaits the next outage. Generac home standby and QT Series generators operate on natural gas or liquid propane and are usually installed outside at ground level or on the roof.

What will it power?

Generac generators supply electricity to your main distribution panel through an automatic transfer switch. You can elect to back up selected emergency circuits or your entire electrical service. Our 7 to 13 kW air-cooled models provide exceptional value to homeowners interested in backing up critical circuits. The 16 and 18 kW air-cooled models and our liquid-cooled units ranging from 18-150 kW are ideal for critical circuit and entire service back up in larger residential, commercial and light industrial applications.

Why should I buy an automatic standby generator instead of a portable generator?

While portable generators do supply power, Generac automatic standby generators produce higher quality, computer friendly electricity. They operate automatically and run a weekly self-test to ensure proper response to an outage. There are no extension cords to plug in and no gas tanks to fill. Because they operate automatically, your property is protected even when you're away. When the utility returns, the generator shuts itself off and restores utility power.

What's the difference between air-cooled and liquid-cooled?

Their air-cooled home standby units use engines that they design and manufacture specifically for their smaller generators. Volume production helps them to keep costs down, making their air-cooled generators the most affordable in the industry. Smaller models essential circuits and our 16 and 18 kW units can often back up the entire service, in many residential applications.

Generac liquid-cooled generators use over-the-road truck or industrial engines for reliability, long life and increased horsepower. This makes them ideal for larger homes, commercial and light industrial applications.

Do they have to be maintained?

Just like your car's engine, generators need periodic oil and filter changes. Many customers rely on Generac's preventative maintenance kits to satisfy routine maintenance requirements. Refer to your owner's manual for routine maintenance procedures and schedules. Kits can be purchased through Freier's Electric and Heating, Inc.

What is the advantage of an aluminum enclosure?

Aluminum is corrosion resistant, so it prolongs the life and look of the generator, particularly in regions where salt is often spread on the roads in winter.

What is Quiet-Test™?

Quiet-Test is a feature that allows the generator's engine to run at lower speeds during the automatic weekly self-test cycle (exercise). Quiet-Test reduces generator sound levels by up to 50%, making them as quiet as a car idling in your driveway. This near-silent operation allows the 16 and 18 kW air-cooled models and our QT Series generators to satisfy all known sound ordinances. QuietTest also reduces fuel consumption during exercise.

How do I select a generator that's right for me?

The most accurate way is to size a generator for any application is to measure the total amount of electricity required to power the circuits or appliances that will operate with emergency backup power. In addition, certain appliances such as central air conditioners can require up to five times as much power to get them started as they will use when running. When selecting a generator, that additional starting requirement must be taken into consideration. We recommend that you consult our electrical department first, to ensure your generator is correctly sized for your specific requirements.

Generac's 10, 12 or 16 circuit pre-wired systems make sizing easy for customers who only want to back up a few essential circuits. You simply connect the circuits you want to back up to matching circuits in the pre-wired transfer switch. For customers concerned with air conditioning, you will need to make sure the kW rating of the generator and the size of the circuit breakers in the transfer switch will meet the A/C startup power requirements.

How much fuel does an automatic standby generator use?

  7-18 kW Air-Cooled 20-45 kW Liquid-Cooled 60-150 kW Liquid-Cooled
Natural Gas (cu ft/hr) 100-250 375-750 960-2075
LP (gal./hr) 1.3 - 2.8 4.25 – 7.9 11.0 – 22.6

Please refer to the individual model's specification sheet for exact figures.

Note: Figures are based on continuous operation at full load. It is unlikely that the generator will run at full load for an extended period, therefore, consumption decreases accordingly.

What type of transfer switch do I need?

Their air-cooled home standby units and liquid-cooled QT models R-Series controllers require RTS transfer switches (100-400 amps), QT models with the H-100 controller and all QTA models require HTS transfer switches (100-800 amps).

Can a QT Series generator be installed inside my building?

Although their home standby and standard QT Series generators are designed for outdoor installation only, their QTA models are available without an enclosure and can be used for indoor applications. .

Can I get a remote annunciator that will interface with my building management system?

A remote annunciator is available for all QTA models and QT models with the PowerManager H-100 controller.

Where is my generator made?

Generac generators are made in the United States. Manufactured by Generac Power Systems, Inc. in one of four manufacturing facilities in Wisconsin and Iowa, they design and build their complete product from the controls to the enclosures, to their air-cooled engines specifically designed for generators. This ensures that their products are built to their highest standards.

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