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Find the Best Generator Brands

by ConsumerAffairs Research Team

Use our guide to research the best generator brand for you. Important things to consider when choosing a generator include size, output, capacity, fuel efficiency, noise level, technology and cost. We explain what to look for in residential and commercial generators that provide backup power or whole-house power in the event of a power outage. Portable and inverter generators provide a primary source of energy to remote and mobile locations such as construction sites, RVs and boats.

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How to buy a generator

How do you determine the correct generator size and output?

Determining the size of generator to buy comes down to which household appliances you want to power in the event of an outage. This will determine the kilowatt/watt capacity and the installation wiring of the generator, with most home standby generators being permanently connected.

  • Wattage: Generator manufacturers interchange the use of watts and kilowatts (one kilowatt equals 1,000 watts). A typical small- to medium-sized home needs a generator that produces around 3,000-8,000 watts, with larger, luxury homes and big businesses needing 50,000-200,000 watts.
  • Rectifiers: Newer generator models include a rectifier, which converts electrical output into smooth electrical waves, also known as sine waves. Sine waves are needed to power sensitive electronics like laptops, TVs and other high-end devices. Generators with rectifiers are more expensive but can be very efficient.
  • Single vs. three-phase: Single- and three-phase generators produce power differently, with a single-phase generator using one wave to produce power and a three-phase generator producing three separate waves of power, delivered in one sequence, ensuring uninterrupted power flow. Most residential power is single-phase power so most homes only need a single-phase generator, while most luxury homes and large businesses require a three-phase generator.

What types of fuel do generators use?

Generators generally use one of three types of fuel: gasoline, propane or diesel. Residential and commercial standby generators typically connect to the property’s fuel source to prevent the need to constantly refuel, while portable and inverter generators require manual filling.

  • Gasoline: Gasoline powers the majority of smaller, portable generators used for recreation purposes. They work by using a spark plug to ignite the gasoline and require manual refilling.
  • Natural gas: Natural gas is a popular option for home and commercial standby generators because you can connect them straight to the natural gas line that feeds into your property, eliminating the need to refuel your unit manually.
  • Propane/Liquid propane: Propane-powered generators are generally more expensive to operate because propane itself is more expensive than natural gas. However, you can get propane delivered to your home or use your home’s liquid propane line to provide continuous fuel flow.
  • Diesel: Diesel generators are preferred over gasoline because diesel engines are more efficient, producing more power at lower speeds. Diesel is cheaper and more fuel efficient than gasoline.
  • Dual-fuel: Dual-fuel generators are capable of using two types of fuel at the same time, using a governor that gradually adds the secondary fuel source until the optimal mixture is achieved for efficient operation.

How fuel efficient are generators?

It's always a good idea to know the estimated run time and how fuel efficient the generator you are interested in is, especially if it's one that requires you to refill the fuel supply manually. Many new generator models are fairly fuel-efficient, regardless of the fuel type. Large, standby units have technology that lets them maximize power and minimize fuel use.

  • Fuel efficiency: Natural gas and liquid propane are becoming the most popular types of residential and commercial standby generators because they are the most fuel efficient. Fuel efficiency will vary depending on the load it is operating under. For example, a natural gas powered 22-kilowatt generator will burn around three and a half gallons per minute on a full load, while a 38-kilowatt unit will burn around five and a half gallons per hour on a full load.
  • Load management: Some larger models of standby generators have load-management technology that lets them operate at maximum efficiency. Load management technology is designed to prevent too many high-current appliances from operating at the same time by automatically sensing if large appliances like an air conditioner or electric water heater should run or not.

How loud are generators?

The noise level a generator can produce is important. Whether you’re camping with a portable generator or at home when your standby generator kicks on, you’ll want a unit that runs smoothly and quietly. All generators are marked with a decibel rating, which is measured at an industry standard of 23 feet away from the generator.

  • Decibels: Most generators should run at or below 70 decibels (dB), which is about the equivalent of being in a car traveling 65 miles per hour. Most residential standby generators are designed to be quiet and produce about the same amount of decibels as an air conditioning unit (66-69dB).
  • Sound-reducing enclosures: Most new generator models use sound-reducing enclosures that keep units operating at around 65 dB for large residential and commercial standby units.
  • Inverter portable generators: If you are camping or near other people and need a quiet, portable generator, inverter generators are typically the quietest type because of the way they generate power.

What kind of advanced technology do generators use?

Modern generators have advanced features that make them more efficient, easier to use and maintain and more reliable than older models. From devices that automatically detect a power outage to a device that connects to cellular networks so you can use a mobile app to monitor your unit remotely, technology has made owning a generator relatively hassle-free.

  • Transfer switches: Transfer switches switch an electrical load between two sources. They are used with home and commercial standby generators to detect power outages and automatically switch the power load to the generator when one is detected. Once power is restored, it switches the power load back to the main source. Modern transfer switches can operate as fast as ten seconds of downtime in the event of an outage. Most companies sell them separately but require them for home and commercial units.
  • Paralleling systems: Paralleling systems are typically used for large businesses like hospitals, airports and data centers and work by synchronizing multiple generators to produce more power. Large boats use paralleling systems to connect multiple generators located in various parts of the vessel.
  • Low-oil shutoff: Most new generator models are equipped with low-oil shutoff capabilities. This prevents engine damage due to low oil levels.
  • Electric start with backup: Many portable generators are designed with an electric start, eliminating the need for a recoil rope starter, although those are still used as backups to the electric start.
  • Remote monitoring: Residential and commercial standby generators equipped with remote monitoring devices use wireless networks to relay operating data to a mobile app. Remote monitoring is popular with businesses so they can monitor their company’s power status.

How much does it cost to have a standby generator installed?

Most standby and whole house generators are installed as permanent fixtures outside of your house on a concrete pad, similar to an air conditioning unit. Standby generators that power your main appliances in the event of an outage cost less to install than whole house generators that power your entire house.

  • Standby generator: A standby generator is intended to power your main appliances in the event of an outage. Small to medium -sized standby generators cost around $500-$1,000 to install.
  • Whole-house generator: Large generators that power your entire home when the power goes out typically come with an installation fee of around $3,000-$5,000.
  • Additional costs: Some additional costs to consider before having a generator permanently installed include the concrete pad that the generator sits on, as well as the transfer switch. Transfer switches cost around $200 and must be installed in your power-inlet box by a professional electrician.

What are the different types of generators?

Home standby generators

Home standby generators sit close to your home like an air conditioning unit and hook up to your property's electrical system and natural gas source. They are connected to a transfer switch which lets the generator know when your home loses power and automatically turns it on seconds later. Home standby generators come in various sizes and output wattage depending on the size of your home and how many appliances you need to power.

Commercial standby generators

Commercial standby generators are similar to home standby generators but on a larger scale. Commercial models can use paralleling systems to connect multiple generators and provide more power from a single line.

Single vs. three-phase generators

Single- and three- phase generators provide power differently. Both types provide alternating current (AC) power, but a three-phase generator produces three separate waves of power, delivered in one sequence, ensuring uninterrupted power flow. Most residential power is single-phase, therefore requiring only a single-phase generator. Large businesses like hospitals, airports and data centers require three-phase systems.

Inverter generators

Inverter generators produce direct current (DC) power and convert it to alternating current (AC) power. This process creates a smoother electrical current, which is more stable and safer for electronic devices.

Portable generators

Portable generators are light enough to carry or have a built-in set of wheels to make them easier to move to different locations. Small portable generators are mainly used for recreational purposes, while larger, industrial portable generators are used to power remote work sites.

Who would benefit from a generator?


Home standby generators provide a sense of comfort knowing your home will still maintain power in the event of a power outage. Most home standby generators can be hooked up to your home’s fuel source and installed with a transfer switch to kick on within seconds after you lose power.


Businesses with backup generators will never lose revenue due to lost productivity or downtime during a power outage. Essential businesses like hospitals, airports, data centers or government facilities will never have to worry about not being able to perform critical tasks when the power goes out.

People with RVs and campers

If you own an RV or camper, a portable generator can power your appliances like TVs, electric grill, satellite receiver, portable fan or radiant heater.

People who host outdoor events

If you like to entertain or host events outdoors, a portable generator will allow you to power outdoor lights, heaters, fans and more.


Boat owners use portable and backup generators to power their boat’s electric supply. Larger vessels can use multiple generators hooked up together to create more wattage from a single line.

Not sure how to choose?

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    Author reviews for generator companies

    Generac Power Systems

    For over 50 years, Generac has been making residential standby generators. Today it also makes portable and industrial generators, fully automatic transfer switches and accessories for backup power applications. Consumers can choose from multiple fuel types for their generators and many different series and models based on their specific needs.

    Read more about Generac Power Systems

    Westinghouse got its start over 115 years ago, patenting the rotary steam engine. Throughout the years it has designed and manufactured multiple consumer appliances such as energy efficient light bulbs, LCD TVs and conventional portable and inverter generators. Its generators are designed for powering home appliances in emergency situations, campers and RVs and industrial job sites.

    Read more about Westinghouse
    Honda Generators

    Honda is known for its design and manufacturing of large and small vehicles and power equipment. Additionally, it makes a line of portable, inverter generators for home, work and recreational use that can power anything from common household appliances to industrial motors. All generator models designed by Honda are made to be used with regular unleaded gasoline. For a safe and easy-to-use experience, Honda recommends installing a transfer switch before using its generators.

    Read more about Honda Generators
    Yamaha Generators

    Yamaha has been designing and manufacturing a wide range of products for over 130 years, including musical instruments, electronics and power sports equipment. It began making generators in 1973 and today offers 14 models of inverter and premium-grade industrial generators.

    Read more about Yamaha Generators
    Kohler Generators

    Kohler can trace its roots back to 1873 making cast iron castings. Today, along with plumbing fixtures, engines and furniture, it manufactures multiple models of industrial, home, portable, mobile and marine generators. Kohler generators can be fueled by natural gas or diesel and can be used to power anything from campers, boats and RVs, to large businesses and data centers.

    Read more about Kohler Generators
    Champion Power Equipment

    Since its beginning in 2003, Champion Power Equipment has expanded from its California base and opened locations in Tennessee, Wisconsin and Toronto. It has also expanded its product line to include portable, inverter and home standby generators for work, home and recreational use. Champion’s generators can operate using gas, propane or dual-fuel and include either a pull or electric start or wireless remote start.

    Read more about Champion Power Equipment
    Honeywell Generators

    Honeywell manufactures consumer products like thermostats, sensors, security alarms and dehumidifiers. It also designs and makes a line of backup power generators for home, commercial and recreational use. Honeywell’s generators run on natural gas, diesel or propane and can be a single- or three-phase model depending on the size of your property.

    Read more about Honeywell Generators
    All Power Generators

    All Power is based in North Carolina and manufactures and distributes power equipment worldwide. Its products include engines, pressure washers, lawn mowers, snow blowers and portable generators. Its line of portable generators includes 15 models that are powered by either gas, propane or diesel.

    • Gasoline generators: All Power’s line of gasoline-powered generators have a power output ranging from 1,300-8,000 watts and a one- to eight-gallon fuel capacity. Each gasoline model comes with a low-oil shutdown feature to prevent engine damage from lack of oil and wheel kits to make transportation easy and convenient.
    • Diesel generators: All Power’s diesel generator models produce a power output ranging from 6,500-7,000 watts and run-times around 11 hours when running on half of a load. Each model includes an electric start and a recoil back-up start.
    • Propane generators: All Power’s propane-powered models have a power output ranging from 3,500-10,000 watts and an eight-hour run time when running on half of a load. Each model includes a propane hose, mobility kit and either a 420cc engine, six and a half horsepower engine or a 13 horsepower engine.
    • Product registration: All Power includes an online form to fill out for product registration, including your product’s model and serial number. Proof of purchase will be necessary for all warranty claims.
    • Support and service: All Power includes a support and service page on their website that allows you to submit a ticket to their support team, access a knowledgebase of articles, manuals and FAQs, and read about company news and products. Additionally, you can find email addresses for support, sales and new orders, as well as the company's mailing address.
    GE Generators

    GE designs and manufactures products across many sectors, including power and water, oil and gas and aviation. It is also a common brand for consumer power products and appliances. Its standby generators and transfer switches are designed to provide backup power for home and commercial needs.

    Read more about GE Generators
    by ConsumerAffairs Research Team

    The ConsumerAffairs Research Team believes everyone deserves to make smart decisions. We aim to provide readers with the most up-to-date information available about today's consumer products and services.