Portable vs Standby Generators: Which One Should You Choose?

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Last updated: September 04, 2023
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With or without connection to the grid, there are so many reasons to own or install an electric generator. They’re useful in your countryside home, for picnicking, caravanning, as a backup when the public supply is down, during emergencies, for commercial organizations such as hospitals, etc. The fossil fuel-powered electric generators are available in different types, designs, sizes, and can be categorized into two: portable and standby generators. One of the similarities between these types of generators includes that they use the same fuels: diesel, gasoline, propane, and natural gas. But what are the differences between them?

In this portable vs. standby generators comparison article, we’ll see what differentiates the two and which one will be suitable for you. Generally, the main differences lie in the fact that the portable generators are more transportable, quieter, less-powerful than the standby generators. However, we’ll go further by analyzing the advantages and disadvantages before comparing their features head-to-head.

Portable generator: Definition, pros and cons

Portable vs Standby Generators: Which One Should You Choose?Portable generators, like their names suggest, are electrical power equipment that can be easily moved or carried from one location to the other. The most popular types are the compact ultra-quiet inverter generators and the open-frame conventional generators.

These generators usually have small to medium tank sizes ranging from 0.9 to 20-gallon capacity and run on diesel, gasoline, propane, or natural gas. However, some new dual-fuel models are designed to use gasoline and propane.

But are all ‘portable’ generators really portable? Well, not all portable generators are portable. Some weigh more than 150 pounds and are very large in dimensions. The features which make them portable include their large wheels and carry handles, which make them qualified to be categorized among the “portable” models.

These types of generators can be used in residential homes, at construction sites, and for outdoor recreational use. Their output power ranges from around 1,000 to 25,000 watts. Portable generators with an output of around 1000W to 2500W usually have an easy-grip handle to take them with you anywhere, and their dry weight is usually less than 50 pounds. For example, the WEN 56200i generator weighs 48 pounds, while Honda EU2200i weighs around 40 pounds.

Their advantages and disadvantages include:


  • Small and lightweight
  • Usable in mobile homes, outdoors, and at home
  • Some have encapsulated design
  • The “portable” ones are really quiet
  • Not as expensive as the standby types


  • Usually just a small tank
  • Some are not so portable

Standby or whole-house generator: Definition, pros and cons

Portable vs Standby Generators: Which One Should You Choose?Standby generators, also called whole-house or fixed generators, are often permanently installed generators that are designed for home and commercial use.

However, standby generators can also be used for powering homes. Trusted Source Standby Generators- Do You Need a Standby Generator? A standby generator can energize a house for days after a blackout. Here's how to know if a standby generator is a good investment. www.popularmechanics.com Their power outputs range from 8 kilowatts to 100 kilowatts or more. Standby generators have insulated covers which make most of them weatherproof. Therefore, unlike portable generators, they can be used outdoors permanently, regardless of whether it rains or shines. Standby generators use diesel, propane, or natural gas from the public supply.

These types of generators are ideal for use in organizations that need an uninterrupted power supply as they can start automatically, thanks to a transfer switch. In the event of a power outage in a hospital, for example, they can start instantly. Hence, they are the most reliable type of backup. According to most reviews, home standby generators designed by Generac, are by far the most reliable and time-proven ones.


  • Very reliable
  • Automatic startup
  • Very powerful
  • Insulated cover
  • Weatherproof
  • Large tank


  • Permanently installed; not portable

Side-by-side comparison

We pitch both types of generators side by side to see how they compare, using criteria such as the power output, fuel consumption, price, versatility, and more.

Power output

Standby generators are without a doubt the most powerful types of generators. Business and whole-house standby generators have between 10 to 50 kilowatts of power output. Meanwhile, there are industrial standby generators with more power output.

However, with portable generators, the power ranges from 1,000 to around 8,000 watts power output for inverter generators and 2,000 to around 25,000 watts for conventional generators. So, if you want to power a whole home but don’t like the lack of portability of standby generators, then the high-end conventional generator is the one for you.

However, the standby generator remains the winner here.


Most portable generators consume less fuel than standby generators, but that is at lesser power output. However, if you’ve decided to go for a standby model, you get better fuel efficiency. Standby generators usually use diesel, propane, and natural gas.  Diesel costs an average of $2.7 per gallon, as of January 18, 2021 Trusted Source Gasoline and Diesel Fuel Update - U.S. Energy Information Administration (EIA) Energy Information Administration – EIA – Official Energy Statistics from the U.S. Government. www.eia.gov , according to the EIA. However, natural gas is $1.5 to $2 cheaper than the equivalent of gasoline per gallon. The cost of diesel per gallon may be more expensive than gasoline, but this is offset by the higher output per gallon generated by standby generators.

However, the only advantage with portable generators is that the gasoline and propane-powered models produce cleaner power while emitting lower noise.

Standby generators are however more fuel-efficient.


Due to their size and power output capacity, standby generators are more affordable than standby generators. You’ll pay around $2,000 to $4,000 for very powerful portable generators with 10 to 18 kilowatts power output. However, standby generators generally cost $2,000.00 to $20,000. You also have to consider that standby generators require installation, which may require calling in a professional at extra cost.

Winner: Portable generators win this one.

Portable vs Standby Generators: Which One Should You Choose?Versatility

Portable generators are more versatile. You can deploy them for residential, RV, and outdoor use. You can push a portable generator to the field to supply power for mowing the lawn for example. You can even use it to provide power to charge your smartphones, laptops, and also power your BBQ grill while out camping in a remote area.

Even large and heavy generators can be portable if you attach wheels to them. Some come with a wheel kit, while others require you to buy one.

Winner: Portable generators are more versatile.


Because of their extra-large tanks, standby generators have a longer runtime than the portable models. Standby generators have a tank capacity

Meanwhile, portable generators have fuel tank capacities that range from less than one gallon to around 20 gallons or more. However, there are different tanks for standby generators.

The fuel tanks built into standby generators have a starting capacity of around 60 gallons.

Sub-base fuel tanks have around 100 to 3,000-gallon capacity and can last weeks of use, if not months, depending on the frequency of use.

With one to two gallons of fuel, a portable generator can run for eight to 10 hours. Meanwhile, a standby generator will run for the same duration at much more gallons of fuel. Standby generators are also quieter.

Standby generators have longer runtime with better fuel efficiency.


With standby generators, there is less risk of carbon monoxide as this generator type producer fewer of this deadly gas, compared to conventional portable generators. Also, standby generators eliminate this risk because they’re oftentimes installed outdoors.

Portable generators, however, have safety features such as overload protection and low-oil shutdown features which protect the life of the engine.

This is a tie.

Installation and maintenance

Portable vs Standby Generators: Which One Should You Choose?Portable generators come largely almost completely assembled. You may however need to install the wheels, battery, and  handles. This can be completed by yourself with no additional help by following instructions in the product manual.

However, standby generators require installation and at least, requires help from a second hand and may need you to have a technician from authorized organizations. However, you have to note that you would need to install a concrete slab to place the standby generator which would come at an extra cost. When. It comes to maintenance, standby generators need less of it. Standby generators need an oil change once in 200 hours of use or two years. Portable generators need an oil change after every two to six months period of use. While both require monthly, semi-annual, and annual maintenance, with standby generators, you may require to hire a technician.

Portable generators edge standby models this time.

Final thoughts

We’ve seen the benefits of portable generator vs standby generator. The differences between the portable and standby generators border on convenience, cost, functionality, and sustainability. While standby generators are more fuel-efficient, have longer runtime, and are more powerful, portable generators require less inexpensive installation needs and maintenance. As we have seen in this portable vs standby generator comparison, portable generators are inexpensive and versatile. However, your choice should be influenced by your needs. If you run a business or have a home with up to 15 kilowatts of load power, the standby generator is the best for you since you’d want a quiet model. However, if what you’re looking for is a traveling generator for your picnics, for RVing, boating, or use everywhere possible, a portable generator will serve you well.


Standby Generators- Do You Need a Standby Generator?
A standby generator can energize a house for days after a blackout. Here's how to know if a standby generator is a good investment.
Gasoline and Diesel Fuel Update - U.S. Energy Information Administration (EIA)
Energy Information Administration – EIA – Official Energy Statistics from the U.S. Government.

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