The Generac 20kW Generator: Ultimate Home Power


Having electricity is no longer a modern luxury, it is a necessity. The ability to supply the proper power to your home is something that many people take for granted. But if you live in an area where power outages are common, you know how devastating it can be to go without electricity for even a few days.

Some people get by with small, portable generators, but these are often not powerful enough or fuel efficient enough to run your home consistently when the power goes out.

For this reason, companies like Generac have developed a line of generators that are stationary, can be wired directly into your home electrical system, run off propane or natural gas, and can easily supply enough power to run your entire home indefinitely.

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Click the table below for answers to your questions or to see a specific generator review. Or read on.  

In this article, we’ll look at two of these Generac 20 kW generator models, one is in the Synergy Series and the other’s in the Guardian Series. We’ll look at the features of both these models to help you decide if either of them is the right model to keep your lights on and make sure you don’t go without those modern necessities.

How Much Power Do I Need?

The first thing you need to consider is just how much power you are going to need to keep your house up and running. Go here and use our simple reference tool to get started.

You’ll need to decide if you just want the essential, or if you’ll want every device to run during an outage. To calculate what size of generator you will need, all you have to do is add up the wattage of all the appliances you would like to function off the generator.

Your electrical devices should all have a wattage rating somewhere on their housing. You should look near where the electric cord goes into the device, that’s usually where manufacturers put the rating. If it is not there, check your owner’s manual or the company’s website.

Another thing to keep in mind is that some appliances have what are called “surge watts.” This means they require a bit more power to get them up and running. Once they are running, the wattage goes down to an operating level. As you add up your total wattage needed, you should add surge watts instead of running watts for those devices that have them.

Once you know how many total watts your will need, divide that number by 1,000 and that’s how many kilowatts (kW) you need out of a generator.

Is the Generac 6055 20 kW “Synergy Series” Right for Me?

Generac 6055 20kW

If you are only interested in the best of the best for your backup generator, Generac’s Synergy Series is it.

This unit operates on either propane or natural gas. It comes with a “no tools” switch so that you can hook up both fuel types if you like and easily and conveniently switch between them whenever you like.

It comes housed in an aluminum casing to fully protect the generator from high winds, rains, and other potentially harmful weather conditions. Since you are more likely to experience outages during bad weather, this protective casing is a necessity.

The Synergy Series comes with Generac’s G-Flex™ technology that really makes these models stand out from all the rest. This technology tracks your energy consumption and adjusts the generator to compensate. If you are not using a full 20 kW, why have the generation putting out that much power? This allows you to be much more cost effective since the generator will automatically lower its own fuel consumption when you aren’t using that much power.

This series also comes standard with Generac’s Mobile Link™ feature which allows you to connect to the generator wirelessly via a smartphone or tablet. With the free app, you can monitor your energy consumption, get notification of maintenance needs, and view your unit’s history (just to name a few).

And the power generated by the 6055 is clean and safe for all your electronics. At total harmonic distortion (THD) of less than 2%, this is very “clean” power. Two percent THD is lower than even what your utility power company must meet as required by the Institute of Electrical and Electronics Engineers (IEEE) standard. Bottom line is you can rest assured your delicate electronics, like computers and televisions won’t be damaged on the Synergy Model 6055’s power.

With the Generac 6055 20kW generator, you can be sure that your home will never go without power, that you’ll save money over other generator types, and that you’ll be able to monitor your generator even when you’re away from home.

What About the Generac 6729 20 kW “Guardian Series”?

Generac 6729 20kW

Generac’s Guardian series is much like the Synergy Series, but without some of the premium features.

You still get the option of propane or natural gas with a no tools switch to choose between the power sources. And the powerful OHVI® engine will deliver up to 20kW of power with less than 5% harmonic distortion. It’s not quite as clean as the Synergy model, but still within the safe limits for delicate devices.

It comes with Generac’s Evolution™ controller which uses a bright LCD text display from which you can monitor the device and program its routine self-tests.

It does not come with the Mobile Link™ technology, but this can be purchased separately if you would like to be able to monitor your generator remotely.

The generator will run routine self-tests but do so in a quiet mode that is hardly noticeable. This way the generator can monitor its own status and not create a lot of noise when doing so.

If you’re looking for a quality 20 kW generator, but without some of the advanced technology features of the Synergy Series, the Guardian class generators are a great option.

What Is the Warranty on Generac Generators?

Both the Synergy and Guardian series generators come with a standard 5-year limited warranty. They will guarantee the generator will be free of manufacturer or part errors within this time frame.

And with their extensive network of qualified technicians, they can service your generator on-site in case anything should happen. You can even sync your mobile app to alert your local technician if anything goes wrong with the generator. This is another layer of protect to give you some peace of mind.


Power is essential to modern life. And if you routine suffer from utility loss, you need something that is going to be dependable to get you through these situations.

With the Generac 20 kW generators, you will have enough power to run most homes. Be sure to check just how much power you will need. But, if you need a reliable generator, then either the Synergy or Guardian Series of Generac generators should be on the top of your list. Don’t be left in the dark!

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