Are you considering installing a Generac generator for your home or RV? If so, you may be wondering how much propane the generator will need to operate. The amount of fuel that a Generac generator can burn is dependent on its size and power output capabilities – but no matter what size it is, understanding how much propane your machine needs can help you plan ahead better.
In this blog post, we’ll break down the basics of propane usage for Generac generators, while providing tips to ensure proper use in order to get the most out of your machine. Read on for more information regarding how much propane does a Generac Generator use!

How Much Propane Does a Generac Generator Use?
Generac generators have become a popular choice for power backup, as they can supply electricity during an outage. One of the most common questions that arise among those who own or plan to own a Generac generator is how much propane it consumes. The answer to this may vary depending on the generator’s wattage, size, and usage.
However, on average, a Generac generator can use between 2-4 gallons of propane per hour. Therefore, it is essential to determine the generator’s expected runtime during an outage and how much propane you will need to support it. Knowing this information beforehand can help you plan and prepare for power emergencies, ensuring that your generator continues to function whenever you need it.
What is a Generac Generator?
Generac generators have been around since the 1960s when they were first developed as a solution to power outages. Since then, they have become one of the most popular generator brands in North America, with thousands of units sold every year for residential and commercial use.
These generators come in different sizes and wattage ranges, from small portable units perfect for RVs and outdoor adventures, to larger, stationary units capable of powering an entire home in the case of a power outage. Whether you need a generator for construction sites or emergency backup power, Generac has something that can meet your needs.
Different models have different fuel capacities, so it is important to research each model before making a decision on what type of generator to purchase. Aside from power output and fuel capacity, two other useful features of Generac generators include their noise reduction capabilities and ability to run on different types of fuel, including liquid propane (LP).
It is important to note that when running a generator on LP (propane), the fuel must be stored in an approved container that is located outside the home or RV. This is due to the flammable nature of propane, which can be dangerous if not handled and stored properly.
Why Propane?
There are many advantages to running a Generac generator on LP fuel. Propane is a clean-burning, low-emission fuel that can provide power without producing hazardous fumes or odors. It’s also an extremely efficient fuel source – in fact, it’s estimated that propane generators are up to 30% more efficient than gasoline models. Additionally, it is an affordable and widely available fuel, making it an ideal choice for powering your home or RV during a power outage.
Propane can also be stored easily in approved tanks outdoors, reducing the risk of hazardous fumes leaking into the air inside your home. Additionally, propane fuel has a long shelf life – up to 10 years – meaning you don’t have to worry about it spoiling over time.
Generac generators can also run on gasoline, diesel, and natural gas fuel sources, each with its own benefits. Generators running on gasoline will usually require more frequent maintenance than those operated on LP; however, they are less expensive to operate overall. Diesel-powered generators have a longer life expectancy but may be difficult to find in some locations. Natural gas generators may be more suitable for larger homes or commercial establishments as they require access to an external fuel source, making them difficult to use for portable applications.
Factors Affecting Propane Consumption
All Generac generators run on various fuel sources, but LP is one of the most popular. It is important to understand how much propane your generator will need in order to be properly prepared for an outage.
The amount of fuel that a Generac generator consumes will depend on its size and power output capabilities. Generally, a portable model with a 2,000-watt output will require around 2 gallons of LP per hour. A larger, stationary model with a 7,500-watt output can consume up to 4 gallons per hour.
It is important to note that the amount of fuel needed may vary depending on how heavily the generator is used and for what purpose. For example, if you run your generator for a few hours, it may require less fuel than if you run it continuously over several days.
Aside from size and power output capabilities, temperature can also affect the amount of fuel your Generac generator needs. Propane vaporizes more quickly when exposed to higher temperatures, meaning that colder weather may require more fuel in order to operate efficiently.
Calculating Propane Consumption
Calculating the amount of fuel needed for a Generac generator can be done by following a simple formula. First, you need to know how many kilowatts your generator uses per hour (kWh). Then multiply that number with 0.1 gallons per kWh and divide it by the tank size in gallons. This will give you an estimate of how much propane is used per hour.
For example, if you have a 4-kilowatt generator running on a 20-gallon tank of LP, the equation would look like this: 0.4 x 0.1 = 0.04 gallons per hour of fuel needed to operate the generator.
You can also use online tools or apps to help with the calculations. Many of these tools are free and they can make it easier to determine the amount of fuel your Generac generator will need based on its size and wattage output.
Ultimately, knowing how much propane your Generac generator requires is key to successfully powering an outage. With the right information, you can ensure that your home or RV remains powered and that your generator is running efficiently and safely.
Propane Per Hour Chart For Propane Generators
Generator Size (kW or Watts) | 25% Load | 50% Load | 75% Load | 100% Load (Full Load) |
---|---|---|---|---|
500 Watt Generator | 0.02 Gallons Per Hour | 0.05 Gallons Per Hour | 0.07 Gallons Per Hour | 0.08 Gallons Per Hour |
40kW Generator | 1.88 Gallons Per Hour | 4.01 Gallons Per Hour | 5.33 Gallons Per Hour | 6.69 Gallons Per Hour |
Generac Models and Their Propane Consumption
Generac manufactures a wide range of generators from portable models perfect for camping and RVing to larger standby units designed for powering an entire home.
The popular Generac GP2200i portable inverter generator is capable of producing 2,200 watts of power and runs on both gasoline and LP fuel. It has a 1.2-gallon tank capacity and can run for up to 9.5 hours on a single tank of LP, consuming around 0.7 gallons per hour.

The Generac XP8000E portable generator is another popular model that is capable of producing 8,000 watts of power with an 11-gallon fuel tank capacity. This model consumes up to 3 gallons of LP fuel per hour and can run for up to 10.5 hours on a single tank.

Finally, the Generac Guardian Series 22-Kilowatt Standby Generator is a large stationary model that produces 22,000 watts of power and runs on LP fuel. It has a 100-gallon capacity fuel tank and can operate continuously for over 24 hours, consuming around 4 gallons of fuel per hour.

To optimize the amount of fuel used, it is important to ensure that your Generac generator is properly maintained and serviced regularly. This will help to ensure that it runs efficiently and uses less fuel over time. Additionally, you should consider using a fuel stabilizer in order to prevent any deterioration of LP fuel stored for long periods of time.
Using a Generac generator with propane fuel is an efficient and cost-effective way to power your home or RV during an outage. By understanding how much LP fuel your generator requires, you can ensure that you’re well-prepared for any emergency situation. With the right equipment, maintenance, and knowledge of appropriate fuel usage, owning a Generac generator can be an invaluable asset for any homeowner.
Knowing the basics of propane consumption and how to properly calculate fuel usage will help ensure that your Generac generator runs efficiently and safely, providing reliable power when you need it most. With a little know-how, you can rest assured that your home or RV will stay powered during even the longest outages.
Safety Tips
In order to keep your Generac generator safe and functioning properly, it is important to take the necessary safety precautions when operating it. Here are some key safety tips to consider when using a Generac generator:
- Make sure to use LP fuel only in your Generac generator.
- Never refuel any type of generator while it is still running or hot.
- Always keep a fire extinguisher nearby when operating the generator.
- When not in use, store the generator in a cool and dry place and make sure to cover it with a tarp if necessary.
- Read through your owner’s manual thoroughly before using your Generac generator for the first time.
- Always stay away from areas with high levels of carbon monoxide when running a generator.
- Make sure to keep any cords and outlets used for powering the generator well away from water to avoid electric shock.
- Use only generators that are UL-listed and can be safely operated outdoors.
- Never attempt to repair or service your Generac generator without the proper tools and instructions.
- Make sure to always properly connect the generator’s output terminals to avoid electric shock and other safety hazards.
By following these safety tips, you can help ensure that your Generac generator runs safely and efficiently for years to come. Taking the necessary precautions when operating a generator is essential for protecting yourself and your property.
You may also watch this video for safety tips
FAQs

Hi there! I’m Daniel Burke, a passionate advocate for sustainable living and outdoor exploration. I’ve spent countless hours researching and testing portable generators and solar batteries for both home and camping use, and I’m excited to share my knowledge with you. Through my experiences, I’ve gained a deep understanding of the benefits and limitations of each power source, and I know firsthand the importance of having a reliable source of energy when you’re out in the wilderness or dealing with a power outage at home. My goal with this blog is to provide you with honest and insightful information to help you make informed decisions when it comes to choosing a portable generator or solar battery.