When the power goes out, a generator can be a lifesaver, keeping your fridge running and the lights on. But just how long can a generator run? Knowing the answer is crucial for weathering any power outage.
A generator’s runtime depends on several things: the type of fuel it uses, how much power you’re drawing from it (the “load”), how well you maintain it, and the kind of generator it is.
We’ll break down the runtime differences between home standby generators and inverter generators, so you can plan accordingly.
Home Standby Generators: Runtime and Considerations
Home standby generators are designed to kick in automatically when the power goes out, providing backup power to your home.
For example, Generac’s air-cooled Guardian Series generators range from 10 to 26 kW.
How long can you expect them to run? That depends on a few key factors.
Factors Affecting Runtime
The most important factors affecting runtime are fuel and oil levels. Regular maintenance of both is essential. You’ll also want to follow a regular maintenance schedule for your particular make and model.
Generac, for example, recommends consulting a Generac service dealer for maintenance and repairs.
Important Considerations
Keep in mind that even a well-maintained home standby generator can’t run forever. Be aware of its continuous operation limitations, and make sure it has proper ventilation. Professional installation and servicing are essential to safe and optimal performance.
Inverter Generators: Efficiency and Runtime
Inverter generators are a popular choice because they’re efficient and can run for a good amount of time. Here’s a quick look at what affects how long they run.
What is an Inverter Generator?
An inverter generator makes clean, consistent AC power. That’s important if you’re powering up sensitive electronics. Inverter generators are known for being easy to carry around, using fuel efficiently, and running quietly.
Factors Affecting Inverter Generator Runtime
How long an inverter generator runs depends on a few things:
- Load Percentage: Depending on the load, a full tank might last anywhere from 6 to 18 hours.
- Fuel Efficiency: Some models are just better at saving fuel than others.
- Maintenance: You’ve got to keep up with those oil changes and air filter cleanings.
Runtime Expectations
Typically, you can expect an inverter generator to run for 6 to 18 hours on a full tank. Most are rated for a total of 1,500 to 2,500 hours of use.
It’s a good idea to give your inverter generator a break to cool down and check things over every 8 to 12 hours you’re using it.
How fuel type affects generator runtime
The type of fuel your generator uses will have a major effect on how long it can run.
Propane
If you’re using a standard 20-pound propane tank, you can anticipate a runtime of roughly 4 to 6 hours when using 25% to 50% of the generator’s power capacity. Propane burns clean and has a long shelf life, but it doesn’t pack as much energy as other fuels.
Diesel
With a diesel generator, you can probably get 10 to 12 hours of runtime for each gallon of fuel, assuming you’re using 25% to 50% of the generator’s capacity. Diesel fuel gives you longer runtimes, but it creates more emissions.
Gasoline
Gasoline is a common fuel source for smaller generators. If you go this route, be sure to think about how you’ll store the fuel and how you’ll stabilize it to keep it fresh.
Natural gas
Natural gas is typically used in home standby generators that are hooked up to a natural gas line. This set-up gives you a continuous fuel source.
Portable power stations vs. generators
If you’re trying to decide between a generator and a portable power station, here are a few things to keep in mind:
Portable power station overview
A portable power station, like the EcoFlow DELTA 2 Max, runs on battery power. The EcoFlow DELTA 2 Max, for example, has a 2400W AC output (surge 4800W) and a 2048Wh battery capacity.
A portable power station is quiet and emission-free, so it’s safe to use indoors. It’s also better for charging small electronics.
Generator overview
A generator runs on fuel, such as gasoline or propane. Because they can power high-wattage appliances and can run for a long time, generators are a good choice for keeping tools and appliances running and for providing backup power during a power outage.
Ideal use cases
A portable power station is ideal when you need something silent and portable for indoor use, or if you just want to charge small electronics.
Choose a generator when you need to continuously run high-wattage appliances.
Maintaining Your Generator for Optimal Runtime
To get the longest possible runtime out of your generator, make sure you follow these maintenance tips:
- Change the oil regularly, following the manufacturer’s recommendations.
- Clean or replace the air filter as needed.
- Use fuel stabilizers for gasoline.
- Replace the spark plug as recommended by the manufacturer.
- Let the generator cool down periodically.
- Never refuel a running generator; let it cool first.
Conclusion
As you can see, how long a generator runs depends on many factors, including the type of fuel it uses, the load it’s carrying, how well it’s maintained, and the generator type.
To get the most out of your generator and ensure that it runs safely, be sure to follow the manufacturer’s recommendations for maintenance and operation.
Finally, before you buy a generator, consider how much power you need, what kind of fuel you prefer, and how you plan to use it.