Home Standby Power Generators for Emergency Backup Power

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Find generator sizes:  7 kW 10 kW 13 kW 20 kW up to 150 kW Single and Three Phase Commercial Generators

Circuit Protection - Guardian Generators
7-13 kW Air-Cooled Standby Generators with ATS
(Need MORE power? Click Here.)

GUARDIAN Air-Cooled Standby GeneratorsGUARDIAN® home standby generators automatically supply electricity to pre-selected circuits during a utility power outage. Our pre-packaged, pre-wired systems make installation fast, easy and so affordable, you’ll wonder why you didn’t buy one sooner! And with GUARDIAN, the kilowatt ratings we list… are the kilowatt ratings you get. Unlike our competitors who only cover a percentage of the standby loads, GUARDIAN covers the entire load, for the full duration of the power outage.

That’s why GUARDIAN is the #1 selling home standby generator on the market.  Choose between:

MORE POWER for Home Standby Power Needs
Choose between:

16 kW Air-Cooled Standby Generators

16 kW Air-Cooled Generator
 
BREAKTHROUGH DESIGN... GUARDIAN QuietSource™ generators are the most powerful, yet most economical air-cooled generators available today! Now with GUARDIAN's exclusive Whisper-Test™ feature, these 16 kW powerhouses run 50% quieter than central air during their weekly self-test. Available in either steel or our corrosion resistant aluminum enclosures, the GUARDIAN QuietSource™ 16 kW is just one more reason why...

The automatic transfer switch in pre-packaged,
air-cooled systems allows you to match the systems 
load center circuits to the amperage in your home’s
main distribution panel.  (Figure at right).
Simply determine which circuits to protect during 
an outage and choose a generator whose transfer
switch's load center offers that number of circuits.
The 7kW model offers 8 circuits of protection, the
10kW offers 10 circuits, the 13kW has 12 circuits
and the 16kW generator protects 16 circuits. All
you do is match a 15 Amp circuit in the transfer
switch load center to a 15 Amp in the main 
distribution panel. A 20 Amp to a 20 Amp and so on.
There is no need to add up wattages, since you’ll never
use all appliances on every circuit at the same time.

The completely automatic Guardian transfer switch monitors incoming voltage from the utility line - around the clock.   When utility power is interrupted, the automatic transfer switch immediately senses the problem and signals the generator to start. The automatic transfer switch then safely closes off the utility line and simultaneously opens a new power line from the generator.  Within seconds, your Guardian generator system begins supplying electricity to the critical emergency circuits of your home or business. The transfer switch continues to monitor the utility line conditions.  When the automatic transfer switch senses the utility line voltage has returned at a steady state, it re-transfers the electrical load back to the utility line and resumes monitoring for subsequent utility loss. The generator will continue to run for an engine cool-down period of several minutes while the entire system stands ready for the next power outage. 

 
For whole-house protection



GUARDIAN offers air-cooled  and liquid cooled

models ranging from 16 - 45kW (single phase) 

and the commercial models ranging from

 20-150kW (single and three phase voltages.) 

Match these generators with an appropriate size 

transfer switch.  Find appropriate Transfer Switch sizes.

To get accurate sizing requirements of a liquid-cooled 

generator, a licensed electrician will need to apply an amp 

meter to the circuits and appliances that are intended 

to operate on backup power. Many customers want

every item in their home or business covered

in the event of an outage.

Generac Guardian Generators transfer switch configuration for whole house power

Guardian Plus Pre-Packaged Specifications

Continuous Standby Power Rating Includes a 
2 Year Limited Warranty

OPTIONAL LOAD SHEDDING

To save on costs, you can offer your customer a smaller generator coupled with the PowerMasterTM load management system. The new priority load control system makes whole-house coverage more affordable and power hungry items a priority. Your air conditioning will start as the electricity from non-essential items is diverted. This means you can buy a smaller, less expensive generator and still run everything in your home or business. The PowerMaster can control two major loads up to 30 Amps at 240 volts each.

A Word on the Standby Power Systems Market:  

Power outages are becoming more frequent and are lasting longer.  There are two major reasons for this trend.  First, severe weather patterns such as thunderstorms, hurricanes, flood and ice storms have increased dramatically over the past few years and are expected to continue at current or even greater levels for the foreseeable future.

In addition, the demand for electricity is increasing at an unprecedented rate and power companies are not able to replace aging transmission networks and build new plants fast enough to keep pace with the growing need.  

Lost Sales per Hours

 Typical KW Generator Cost Payback Hours
Gas Station $446 30 $13,100 29
Restaurant $705 50 $14,800 21
Drug Store $1,400 70 $17,400 12
Supermarket $3,510 150 $34,100 10


For a small to mid-sized business, being without power for just a few hours can mean thousands of dollars in lost revenue, spoiled refrigerated goods, Lost computer records or research data, etc.  But the non-monetary costs are also important considerations.  How much is it worth to be the only gas station, pharmacy, restaurant or grocery store in the area that is open during an extended outage?  According to a survey published by Emerson, a global leader in reliable power technologies for large businesses:

  • There are more than 6 million small businesses in the U.S.

  • 80_ of small businesses experienced at least one power outage in the last year.

  • Of those, 29_ were without power for at least 8 hours and 19_ were without power for at least 16 hours during a single outage.

  • 62_ had no backup power system or power generators

  • 58_ would consider buying a standby power system if it made economic sense.

 

Home  |  Guardian  |  Quietsource Air Cooled  |  Quietsource Liquid Cooled  |  Ultra source Portable Generators

What Should I Know?
Why Own a Generator?
Why GUARDIAN?
How it Works
Selecting a System
Frequently Asked Questions

Why Own a Generator? - GUARDIAN Gives Peace of Mind

Why Own a Generator?

Imagine your life without power. The conveniences you enjoy and the essentials you rely on are suddenly gone. No lights, no heat, no air conditioning. No sump pump to keep your basement dry. The food in your refrigerator spoils. But it doesn’t have to be that way.

With a GUARDIAN® Standby Generator, your power will return within seconds of an outage, keeping your home and your family safe and secure. Because it’s fully automatic, your GUARDIAN Standby Generator will produce electricity as soon as it senses a power outage - 24 hours a day, 365 days a year, even if you’re away. Unlike a portable generator, there are no switches to flip, extension cords to plug in or gas tanks to fill. GUARDIAN Automatic Standby Generators are connected to your regular natural gas or propane service, providing you with continued power during an outage of any duration. 
With GUARDIAN, you’ll never have to worry about your power again.
Why GUARDIAN? - #1 in America

Why GUARDIAN?

Why should you choose GUARDIAN® generators over other brands? Very simply, GUARDIAN has everything you need… superior product, unprecedented availability, the largest generator service organization in the nation and, believe it or not, industry-best pricing.

How do we do it? The same way we’ve been doing it for over 45 years. We design and manufacture our own product. We develop our own control systems and communications software and we create leading-edge technologies that drive the future of standby power. Because we’re more than an assembler, we employ cost-effective manufacturing techniques into our processes and we pass the cost savings on to you.

We believe that everyone deserves the protection of standby power. The products we make are the essence of quality, performance and reliability. That’s why GUARDIAN sells more standby power generators than all of our competitors combined. If America prefers GUARDIAN, shouldn’t you?
How it Works

GUARDIAN® Standby Generators are completely automatic, helping to ensure that you remain safe from the negative and potentially harmful effects of power loss.

1. The GUARDIAN system automatically and continuously monitors incoming power from the utility line. How it Works Illustration

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 GUARDIAN generator supplies electricity to the critical circuits you previously chose to back up.

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.


 
Selecting a System

Protection Made Easy… When choosing your GUARDIAN® Standby Generator, you must first decide how many circuits or rooms you want to protect. Nobody makes it easier than GUARDIAN!

With our pre-packaged, air-cooled systems, all you have to do is match the circuits in our automatic transfer switch to those in your home’s main distribution panel. Then, simply total the number of circuits and correlate that to the generator that best matches your needs. There is absolutely no reason to calculate wattages, since you’ll never use all of your appliances at once. That’s why GUARDIAN leads the industry in creating powerful, yet economical and easy to install emergency standby generators.



"Selecting a System" Video

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 home or away. It automatically supplies power to essential circuits of your home within seconds of a utility outage. After utility power returns, the generator shuts itself off and awaits the next outage. It operates on natural gas or liquid propane and sits outside just like a central air conditioning unit.

What will it power?
GUARDIAN® generators supply electricity to the electrical panel circuits of your home through a built-in load center. You select the number of circuits you want to protect and match it to the appropriate generator system. Everything on that circuit will be protected. GUARDIAN also powers furnaces, air conditioners, well pumps, water heaters and other appliances that are hard wired into your electrical panel.

Why should I buy an automatic standby generator instead of a portable generator?
While portable generators do supply power, an automatic standby generator produces a higher quality of electricity. It operates automatically and runs a weekly self-test to ensure proper response to your needs. There are no extension cords to plug in and no gas tanks to fill. It operates automatically so it protects your home even when you’re away. When utility power returns, the standby generator shuts itself off.

Why circuits and not watts?
Establishing wattage requirements of the appliances you want to power during an outage is difficult because those appliances can be plugged into various outlets in your home. That’s why GUARDIAN has simplified the process. By allowing you to protect everything on chosen circuits, you no longer have to worry about individual items.

What’s the difference between air-cooled and liquid-cooled?
Air-cooled units use engines we design and manufacture specifically for our smaller generators. Volume production helps us to keep cost down, making our air-cooled generators the most affordable for our customers. They cover essential circuits and back-up power needs in most residential applications. Liquid-cooled units use automotive engines for increased horsepower. This makes them ideal for larger requirements such as whole-house power coverage, larger homes and commercial applications.

Do they have to be maintained?
Just like your car’s engine, generators need periodic oil and filter changes. Many customers rely on GUARDIAN’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 the business that sold you your GUARDIAN generator.

What is the advantage of an aluminum enclosure?
Aluminum is corrosion resistant, so it prolongs the life and look of the generator, particularly in salt air communities.

What is Whisper-Test™? (GUARDIAN QuietSouce models only)
Whisper-Test is a feature that reduces noise by 50% during the generator’s weekly self-test cycle. That makes it as quiet as a car idling in your driveway. The generator starts up and operates at a reduced speed, lowering sound output by as much as 12 decibels for units that normally run at higher speeds under load. This allows for near-silent operation in test mode and satisfies all known sound ordinances.

How do I select a generator that’s right for me?
The most accurate way is to have an electrician apply an amp meter to the circuits or appliances that will operate with emergency backup power. Measurements should be taken as the appliance starts up. That’s because start up requires the greatest amount of power.

See our Power Generator Size Calculator for Power Requirements


To eliminate the hassle of this process, GUARDIAN allows you to simply match your system to the existing circuits in your electrical panel. With our 8, 10, 12 or 16 circuit, pre-wired systems, we take the guesswork out of sizing. For customers concerned with air conditioning, the wattage rating of the generator and its circuit breakers inside the transfer switch should be reviewed so that A/C startup power requirements are met.

For GUARDIAN QuietSource liquid-cooled models, a licensed electrician must perform a site survey to determine the size and voltage of the unit to meet your backup power needs.

How long does it take to install an automatic standby generator?
GUARDIAN air-cooled models, which come equipped with a comprehensive installation manual, can take as little as four hours to install. They come pre-mounted on a composite pad to further simplify installation. Liquid-cooled generators normally require up to 14 hours to install. Because of their additional weight, liquid-cooled units must be installed on a stronger mounting surface such as a concrete slab.

Note: Time estimates are based on typical applications. Additional time may be required to run gas conduit or gas piping or to place the unit far from the incoming gas or electrical service.

How much fuel does an automatic standby generator use?
7-16 kW Air-Cooled 20-45 kW Liquid-Cooled 60-150 kW Liquid-Cooled
Natural Gas (cu ft/hr) 100-250 300-750 960-2061
LP (cu ft/hr) 50-90 120-300 375-830

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.

The generator that I've chosen has a 100-amp automatic transfer switch. What if I have 200-amp service?
Emergency circuits should always be isolated by the emergency load center. An isolated sub-panel helps to prevent overload situations.

Is a 200-amp automatic transfer switch available for the air-cooled models and the 20 kW liquid-cooled model?
No. Because a 200-amp transfer switch is not necessary. The outputs of these generators are safely carried with a 100-amp automatic transfer switch.

Where can I purchase parts?
Parts can be purchased through any Authorized GUARDIAN Dealer.

What is the cost of a service/maintenance contract?
Costs are determined by the installing dealer and are based upon service levels. Cost will also vary based on hourly labor rates in your local area.

What type of oil is recommended?
15W-40 is recommended for all liquid-cooled units. The oil should be a SAE rated high detergent oil that meets API Service Class SF requirements for gasoline engines.

Propane tanks are usually rated by pounds. Is there a conversion that can be applied to the fuel consumption numbers?
Yes. For general conversion, propane weighs 4.24 pounds per gallon. 1 lb. = 8.58 cu. ft. 1 gallon = 36.39 cu. ft.

Where do I go to have warranty repairs performed?
Any Authorized GUARDIAN Service Center can perform warranty service. To locate a dealer near you, please refer to our Dealer Locator section of the Web site or call our Automated Dealer Locator at  The automated dealer locator is available 24/7/365. Our Authorized Service Centers provide parts, service and information on GUARDIAN equipment, regardless of where it was purchased.

Where is my generator made?
GUARDIAN generators are made in the United States. Manufactured in Wisconsin by Generac Power Systems Inc., we design and build our complete product from the controls to the enclosures, to our air-cooled engines specifically designed for generators. This ensures that our products are built to our highest standards.

Home Standby Power Generators for Emergency Backup Power

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