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    Pros and Cons of Inverter Generators

    These machines come at a premium price, but they run longer, quieter, and more efficiently than traditional generators

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    Illustration of an inverter generator with a plus and minus sign. Illustration: Consumer Reports, Getty Images

    Inverter generators are a type of portable generator, with a twist.

    When the electricity goes out, both inverter generators and traditional portable generators can power your home appliances and electronics, making the difference between a minor disruption in your life and a catastrophe. You set them up the same way, using gasoline as fuel and positioning them at least 20 feet from your home—never indoors—with the exhaust pointing away from your dwelling.

    But inverter generators typically are far less noisy than traditional portable generators. If you’ve had to suffer through the din of a running portable generator, you can appreciate the value of that for your sanity.

    Inverter generators have other distinct advantages—and one notable drawback. So it’s helpful to know how they work, what makes them unique, and why they might be a worthwhile purchase.

    Is an Inverter Generator Worth It?

    The main drawback of inverter generators is their price. Though prices have been coming down somewhat, these units are still typically pricier than traditional portable generators with a comparable claimed wattage—from a few hundred to a couple of thousand dollars more.

    More on Generators

    But their benefits—which have to do with how they work—may make up for that negative. Inverter generators electronically throttle the engine up and down to meet demand, instead of running full tilt all the time as traditional generators do. That makes them more efficient.

    "An inverter generator only ramps up as high as it needs to," says Misha Kollontai, the Consumer Reports engineer who oversees our generator testing.

    That efficiency means you won’t have to fill up the gas tank as often; that could be useful if fuel is hard to come by after an emergency. Inverter generators also produce lower emissions.

    And the noise difference between inverter and traditional portable generators can be significant. “Inverter generators are generally quiet enough not to drown out nearby conversation,” Kollontai says.

    Many inverter models in Consumer Reports’ generator ratings earn very good or even excellent scores for noise. In contrast, none of the traditional portable generators does better than middling, and quite a number score below that.

    Are Inverter Generators Safer Than Other Portable Generators?

    Carbon monoxide (CO) poisoning is a serious risk with all portable generators that aren’t used properly. Like other portables, inverter generators should only be used outside in an unenclosed area, at least 20 feet from your home, with the exhaust port pointing away from your dwelling.

    To further reduce the risk of carbon monoxide poisoning, some new portable generators feature a built-in sensor that triggers an automatic shutoff if CO builds up to dangerous levels in an enclosed space. And some also have engines that emit less CO in the first place. The best generators come with both features.

    Inverter generators are not inherently safer than other portable generators. Most of the inverter generators in our ratings have the automatic CO shutoff. But that’s also true of most of the traditional portable generators in our ratings.

    You can best ensure your household’s safety by choosing a recommended model from CR’s inverter generator ratings. Only portable and inverter generators with the automatic CO shutoff can earn our recommendation, regardless of how well the models perform otherwise. (In 2020, CR expanded its safety tests to distinguish between generators that simply have these safety features and those we’ve found to be demonstrably safer in various scenarios.)

    What Size Inverter Generator Should You Get?

    To help you make better sense of your options, we break our inverter generator ratings into four groups:

    1. Large Inverter Generators
    Most large inverter generators in our ratings weigh from around 150 to around 300 pounds (wheels included). That’s too big to haul along to a tailgate party but big enough to power your house. They generate 5,000 watts of power or more (at 220 volts).

    This category of inverter generator can be connected directly to your electrical panel with a safety device called a transfer switch, which CR strongly recommends. That allows the generator to power entire circuits in your home rather than having to plug in individual electronics with extension cords.

    2. Midsized Inverter Generators
    These weigh 80 pounds or more and might come with wheels. They produce 2,500 to 5,000 watts but don’t allow the recommended option of connecting to an electrical panel with a transfer switch. Instead, you plug appliances or electronics directly into the generator, which can be dangerous if you don’t follow certain safety guidelines.

    This size is well suited for users of recreational vehicles. These models put out all the power you need for plug-in appliances like a toaster or microwave, and they’re light enough to unload and carry away to a safe distance from your RV before use.

    3. Small Recreational Inverter Generators
    Models of this category of our ratings generate 1,500 to 2,500 watts. That’s enough to be a steady source of basic backup power for a fridge, some lights, and a phone charger—but not much else. These units can’t be connected to a circuit breaker panel or used to power any device that doesn’t have a standard two- or three-prong plug. But you can link multiple inverter generators together with a special cable to combine their output. 

    Many small recreational inverter models come with user-friendly features such as fuel-level indicators; some come with wheels. But these units typically weigh between 50 and 60 pounds, and are designed to be carried with one hand.

    4. Compact Inverter Generators
    You can plug two small appliances directly into the compact inverter generators in our ratings. They produce around 1,000 watts, enough power for tailgating or camping. These units lack convenience features like fuel gauges or standard wheels. With weights between 30 and 40 pounds, though, they’re designed for convenient, one-hand carrying.

    Don’t let the small size of these units lull you into thinking you can bring them inside safely, however.

    “Even a smaller generator can emit hazardous levels of CO in an enclosed space, so make sure you get a unit with CO safety technology and follow placement guidelines,” Kollontai says.

    How to Run a Generator Safely

    Our generator buying guide is a great place to get the lay of the land, and our full generator ratings will let you compare specific models. CR members can read on for ratings and reviews of four top-performing inverter generators, one each from the four sizes we test.

    4 Top Inverter Generators

    Tobie Stanger

    Tobie Stanger is a senior editor at Consumer Reports, where she has been helping readers shop wisely, save money, and avoid scams for more than 30 years. Most recently, her home- and shopping-related beats have included appliance and grocery stores, generators, homeowners and flood insurance, humidifiers, lawn mowers, and luggage—she also covers home improvement products like flooring, roofing, and siding. During off-hours, she works on her own fixer-upper and gets her hands dirty in the garden. Follow her on Twitter @TobieStanger.