Standby Generator Sizing Calulator
Standby Generator Sizing Calulator

Best 20kW Home Standby Generators

Top-Rated & Best-Selling 20kW Standby Generators

By  | Generator Product Expert

There is a huge difference between an ordinary 20kW standby generator and the best 20kW home standby generator.

We've compiled Top 10 lists of best-selling, top-rated and expert recommended 20kW standby generators.

The lists aren't identical, but they feature some of the same models. Usually, consumers gravitate toward our expert recommendations.

Top 10 Selling 20kW Home Standby Generators

Top 10 Rated 20kW Home Standby Generators

Recommended 20kW Home Standby Generators

Top 20kW-22kW Home Standby Generators
Cummins RS20AC - 20kW Quiet Connect™ Series Home Standby Generator System (200A Service Disconnect)
This 20 kW generators are extremely popular because they pack enough power to run a 5-ton air conditioner. This model sells the best for a few reasons: 1. 999cc Cummins Air-Cooled V-Twin OHV Engine which is field-selectable to run on ultra effi...
Kohler 20RESCL-200SELS 20kW Composite Standby Generator System (200A Service Disc. w/ Load Shedding)
Kohler is a well recognized brand and most people associate it with high quality bathroom fixtures. Kohler was actually one of the first manufacturers of standby power generators. They built their first generator in 1920. What's cool about that? ...
Generac Guardian 22kW Standby Generator System (200A Service Disconnect + AC Shedding) w/ Wi-Fi
Generac is the only manufacturer that offers a 22kW air cooled home standby generator . This unit is unlike any home standby currently available and is far below the price of a comparable liquid cooled model. At 22kW, model 70432 is the largest ai...
Liquid Propane Fuel Tank for Standby Generator

The first step in selecting a good standby for your home starts with identifying the fuel type.

Standby generators up to 22kW will use mostly be either natural gas (NG) or liquid propane (LP), but if you're looking for a generator that runs on diesel, you'll need to step up to a liquid-cooled whole-house type that could cost considerably more.

Both LP and diesel fuels will require tanks large enough to properly run the generator. Similarly, the natural gas meter and gas lines will need to be the correct size.

Prior to installation, your contractor will verify this with you, but you can find this information in the installation manual on our product pages.


2. Determine Power NeedsStandby Generator with Central A/C

Next is to find out how much power you'll actually need during an outage and whether or not you want to only back up crucial systems like refrigerators and air conditioning, or the entire house. 

Power Ratings
Larger generators, such as home standbys are rated by kilowatt (kW), which measures the generator's electrical power output. One kilowatt is equivalent to 1,000 watts or (1 kW = 1,000W).

The best way to determine the power needs of your home is to first decide if you want to power your central air conditioner or HVAC equipment during a blackout since it is the most power-hungry appliances in your home.

During summer months, a sweltering blackout could make life miserable, and an ice storm in the winter could crash your holiday plans — leaving pipes susceptible to bursting.

SizingData Plate Sizing on an Air Conditioner
If you plan to run your central air conditioner, you'll need a generator that's capable of running it.

So how can you tell what size you need? Easy, just look at the air conditioning unit's data plate and it'll tell you the size in either BTUs or Tons. There are 12,000 BTUs for each ton of capacity and 3.517 Kilowatts of energy.


Standby Generator Central-Air Conditioning Sizing Chart


So, if you have a 3-ton (36,000BTU) air conditioner, for example, it will require a standby generator that is 11kW or larger. 

To find the perfectly-sized generator that will meet the demands of your home and air conditioner, use our Standby Generator Calculator.


3. Choose a Transfer Switch Home Electrical Breaker Panel

Just like a light bulb needs a switch to turn on, your generator needs one too.

An automatic transfer switch (ATS) allows your generator to automatically spring into action the moment a power failure is detected.

It does this by continuously sensing utility power and after an outage is detected, it simultaneously starts the engine and disconnects power coming from the line and energizes your home's panel through generator power.

Getting the right switch is just as crucial as getting the right generator as they work together to restore lost power. In order to know which will work for you, you'll need to know the amperage of your electrical service panel. You can check this by locating the main breaker in your electrical panel (usually the big pull-out at the top). You can also ask your installer to verify this for you.

Typically, the average sized home has a 200-amp main breaker, so the maximum amount of electricity your home can consume is 200 amps. Smaller, older homes may have 100 to 150-amp service. It's very important to get the same amp switch as your home's panel.  


Generator Remote Monitoring

Several manufacturers are now adding Wi-Fi options to their home standby generators. If you already have a standby that does not have Wi-Fi built in, you can install a wireless monitor to your existing standby generator.


Power In Your Hands!

Now that you know how to pick the perfect standby generator, you can backup your home with peace of mind. Imagine how great you'll feel once your home is protected against power outages of every kind.

You'll never worry about the power going out again!


NEXT: Shop All Home Standby Generators

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