How To Run A Portable Generator Continuously (Non-Stop)

Have you been wondering if you can you run your portable generator non-stop?

That’s a fair question. Portable generators are a fantastic tool to have in a power outage or in areas where electrical service and weather conditions may be iffy.

Below, we will go over how to make your generator run continuously and what you should know before using your generator in this way.

Can you run a portable generator continuously?

Yes, portable generators can run continuously as long as the proper maintenance intervals are given; since gasoline is highly flammable, you’ll want to remember to stop the engine before fueling or refueling any generator.

Additionally, it is important to pay attention to the recommended maintenance schedule for your unit and avoid ever letting it run out of fuel entirely while it is under any load; this could destroy the connected appliances the generator itself.

Keep in mind that this is a pretty basic answer. To ensure that you’re running your generator properly, there are some other things you’ll need to know.

Let’s go over how exactly to get the most out of your portable generator and what you should be aware of before you run it continuously.

Recommended Running Time and Refueling Requirements

Filling a champion generator with gasoline

Generally, portable generators are meant to be used as a backup source of power.

This means that almost all of them should only be relied on in the short-term.

While some models have been manufactured to provide power for days at a time, most generators can be run for 8, 12, or 24-hour intervals with a few boasting 72-hours running times.

However, it’s important to know that there aren’t any portable generators out there that should be run for weeks or months at a time without a break.

First of all, portable generators need fuel.

Whether you’re using gasoline or propane, you’ll need to give them something to sip on. Even the most fuel-efficient machines can’t run forever without a power source.

Secondly, refueling your generator while it’s on is a bad idea.

This means you’ll have to shut your portable generator off while you’re refueling it.

So, regardless of your generator’s running time, if it uses up all of the fuel, you’ll have to shut it off for a bit while you feed it.

Why do you have to shut off your generator when you refuel it?

You may be wondering why you can’t just refuel your portable generator while it’s still running.

I’d counter that with another question: Have you ever put gas into your car without shutting it off?

To be honest, I have. Living in the frigid northern recesses of the United States sometimes necessitates this.

However, that does not mean it is a good idea. Gasoline is highly flammable.

The hotter your engine is, the more likely you are to ignite something accidentally. Now, gasoline itself isn’t flammable in its liquid form.

You can actually throw a match into a bucket of gasoline if there are no fumes present.

Here’s an article about that from the CCOHS, though I believe the article is recommending that you don’t try that.

The article states that “flammable and combustible liquids themselves do not burn. It is the mixture of their vapors and air that burns.”

So, the real danger comes in with fumes that gasoline releases into the air.

A single spark can ignite gasoline fumes in an instant, This is known as the flashpoint. So, if your generator is running low, or, “running on fumes”, you want to be careful when refueling. Ergo, you’ll need to shut it off.

How much fuel does your gas generator hold?

Now that you know why you’ll want to shut your gas generator off when you refuel it, you’ll probably want to consider how much fuel your tank can hold.

Most portable gas generators can hold anywhere from 1 to 10 gallons of fuel at a time. A decent gas-powered generator can get anywhere from 10 to 13 hours of run time per tank of gas.

A standard 5,000-watt generator will use around 18 gallons of gasoline during a 24-hour period. So, if your 8-gallon tank gives you 13 hours of run time, you’ll have to stop and refuel it, say, in the morning and in the evening.

This isn’t too bad, all things considered.

This Firman H05751 7125/5700 Watt 120/240V Electric Start Gas or Propane Dual Fuel Portable Generator does exactly that.

It can be run for around 13 hours at a time on each tank of gas. It’s an all-purpose option that can be used in various scenarios. Plus, it runs on propane. We’ll get into that next.

What about dual-fuel and propane generators?

Most propane tanks, either above or below ground, are 500 to 1,000 gallons.

Expect a propane powered generator to burn 2-3 gallons an hour.

A 500-gallon tank will power your home continuously for a week. A 1,000-gallon tank will last for 2 weeks.”

That being said, your portable propane or dual fuel generator should still be given rest periods if mandated in your user manual.

Just because you can do something doesn’t necessarily mean that you ought to.

This All Power America APG3590CN 10000 Watt Propane Portable Generator w/Electric Start runs pretty impressively if you’re using propane.

Since propane burns really clean, you won’t have to worry about harmful residue clogging your carburetor. It also is pretty darn efficient.

There’s a lot of debate about whether propane or gas generators are better for long-term continuous usage. We will take a look at that next.

Gas vs. Propane Generators: Which will run longer?

You may be wondering whether gas or propane is better.

The answer is that both are good. It really depends on the situation that you’re in.

Gas Generators: The Pros and Cons

Gas generators are super efficient, easy to fix, and reliable. Gas is easy to obtain pretty much anywhere.

Plus, gas burns easily in cold weather.

However, gas may also be expensive and is very flammable.

Also, gas tends to eventually cause all kinds of build-up in your generator’s engine.

You’ll have to clean your carburetor more often and empty out any unused gas before storing your unit.

It’s also important to consider that almost all gas stations use electricity to power their gas pumps.

This means in a city-wide power outage, you might not be able to get gas.

If you are storing your gas at home, you’ll need to have a fuel stabilizer.

Fuel stabilizers are additives that can prolong the lifespan of unused gasoline. (I recommend using Star Tron Enzyme Fuel Treatment for this.)

Propane Generators: The Pros and Cons

Propane generators also are pretty useful in some situations.

Propane comes in cylinders that are pretty much impossible to spill. When you do spill propane, it evaporates right away.

This makes it safer to work with in general. Engines running off of propane are also usually a lot quieter than ones running off of gasoline.

In an emergency situation, propane generators are great for power outages.

You don’t need any electricity to fill up a propane tank. Propane also has a really long shelf life.

You can pretty much store propane indefinitely without a fuel stabilizer of any kind. Plus, propane engines are usually quieter while running continuously than gas engines and propane is cheaper than gas for the most part.

That being said, propane engines are more complex than gas engines. This means that if they break, they’re pretty difficult to fix.

Another big problem is that propane isn’t nearly as efficient as gasoline.

You’ll run out of propane much faster if you’re running your generator all day.

Finally, propane is virtually useless in temperatures below 20 degrees Fahrenheit.

Non-stop Power:You'll Probably Want to Get a Dual-fuel Generator

If you’re trying to keep your generator running for as long as possible without stopping it, you’ll want to get a dual-fuel generator with a well-built engine. This way, you’ll be prepared for whatever gets thrown at you.

For more information on dual fuel inverters, read my post comparing the 10 most popular dual-fuel generators on the market.

It’s pretty quiet, easy to use, and reliable as heck. It also comes with pretty much everything that you need (minus the cover and the fuel) and makes oil changes easier.

Plus, for the price, you get a lot.

Other Things to Consider When Trying to Run Your Generator Continuously

Before you use your portable generator for hours or days on end, you might want to consider that these machines aren’t really designed to be used this way.

If you’re going to run your unit like that, it will break eventually, even if you give it refueling breaks.

The longest I have ever used a portable generator continuously for was around a week.

Before you jump to any conclusions, what I mean is that I ran the thing just about every day whenever I needed power (mostly in the early evening and throughout the night).

You might just need a backup backup generator. If you really need continuous power, depending on your time frame, it may be cheaper to just get a legitimate non-portable standard generator.

However, I get why many people need the portable factor too.


You can run your portable generator for a long time as long as you give it breaks to refuel and follow the guidelines in your user manual.

If you keep your generator under continuous load, it will eventually wear out.

That being said, many portable generators can go for a pretty long time and are surprisingly efficient.

I want to know what you think! Have any tips and tricks for running your generator around the clock?

How long have you kept your unit on? Feel free to share, leave your comments, or give your feedback!

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