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Generators with Low Total Harmonic Distortion

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The top 7 best low THD generators you can buy today

There are a few considerations to make before settling on a portable generator.

For example, select a small, unobtrusive generator if you plan to use it in a residential neighborhood.

If keeping your large household's electronics charged is more crucial than anything else, you'll need a generator that can provide a lot of electricity. If you frequently use sensitive devices like laptops and cell phones, a generator with a low THD is essential.

Tell me about THD

Because not all generators are created equal, it is important that you get one with a low THD if you need to power sensitive equipment.

The amplifier in a generator can create distortion that is measured as total harmonic distortion (THD). Generators with lower levels of total harmonic distortion (THD) produce better quality power.

Modern HVAC systems, computers, and other sensitive electronics are all at risk from generators with high THD. More manufacturers are now making low-THD generators to safely power fragile electronics, as most homes use such devices on a daily basis.

Why is low THD needed?

When looking for low THD models for the home, look for generators with a THD of under 6%. Lighting, sump pumps, and power tools can all run on normal generator output of 9–15%, but your expensive electronics will suffer and have a shorter lifespan as a result.

Unless it's a big selling point, most generator makers won't reveal their THD ratings. Because of this, you should not trust a portable generator to safely run your sensitive equipment if no data on THD is provided.

What to consider when buying a generator

What features should you be on the lookout for:

Strong wattage

The generator's power output should be your primary consideration.

You should get a generator with at least 3500 starting watts and 3000 running watts, in my opinion, because that's how much power a few basic devices need to function (TV, air conditioner, etc).

Clean electricity

Most of today's gadgets require careful handling due to their delicate nature. Your generator's power surge may easily fry them if you are not careful.

Therefore, I believe it is prudent that you look for a generator that is capable of providing clean electricity. Total harmonic distortion of no more than 6% is what I think your next generator should strive towards.

Safety against Electrical Surge

Surges in power are common in generators. For this reason, I believe it is essential to acquire one that has built-in protection against power overload.

This function will ensure that the user's gadgets are safe from power surges since the generator can absorb excess current before it reaches the device.


Find one that can keep going for at least 8.5 hours when only half loaded. In this way, even if the power goes out, you may use your electronics with confidence for at least a day.


Trying to move about a heavy portable generator without the proper accessories is a major pain. So, make sure you are capable of moving it by yourself. 

The Best Generators with Low Total Harmonic Distortion

These are the best portable generators with sufficiently low THD, in my opinion:

Low Total Harmonic Distortion Generator 1   - Generac XT8000EFI 

Modern Generac generators equipped with "True Power Technology" have THD of less than 5 percent, which makes them suitable for powering sensitive electronics.

This model is quite efficient. A low oil shutdown safeguards the machinery in this generator, as it does in other high-quality versions. Covered outlets and a control guard protect the generator's most vulnerable parts from debris and water.

This particular model's 216-pound weight is about par for a generator of this size. While it's not exactly compact, this machine's 10" wheels and fold-down, locking handle make transport and storage a breeze.

One of the most talked-about aspects of this generator is its fuel-injection technology, which eliminates the need for a carburetor. Unlike other high wattage generators, this one doesn't have a carburetor, so it burns gasoline more efficiently and produces far fewer emissions.

Because it uses less fuel when running at idle, the generator can keep going for more hours on a single tank of petrol. A data display shows the machine's current status, so you can monitor its power consumption and maintenance needs.

The Generac XT8000EFI can power a home for up to 9.5 hours on a single tank of gas and produces 240 voltage at full capacity.

However, keep in mind that the generator makes quite a bit of noise, so it shouldn't be used in a residential setting. When compared to the many useful features it has, the price of $1,149 is a steal.

Low Total Harmonic Distortion Generator 2 - Honda EU2200i 

Honda EU2200i 2200-Watt 120-Volt Super Quiet Portable Inverter Generator with CO-Minder - 49-State

If you live in the suburbs and are concerned about noise, the Honda EU2200i is the generator for you. It's a good option for trips where having a generator would be too much of a hassle, such camping trips.

This generator is unique in that it is both compact and silent in operation. Since it can be stored in compact spaces, it is easily portable and has a THD of less than 6%. 

To prevent the engine from being overworked and failing, the Honda EE2200i is equipped with a "low oil" indicator that tells you when to change the oil.

After most of the fuel has been used up, the generator is automatically shut down by the "fuel shutdown" feature to protect the equipment from being damaged by using old fuel.

In addition, the generator monitors the CO levels and turns off the generator automatically if they get to dangerous heights.

If you need extra power for your home, you can connect two Honda EU2200is in parallel. Furthermore, the generator can be started wirelessly from a smartphone through Bluetooth, and the accompanying app has remote shutdown, real-time monitoring, and periodic maintenance alerts.

The generator's maximum output of 120 volts makes it ideal for those who are careful with their usage during blackouts. It's possible to conveniently control your home's climate control system, fridge, microwave, and electronic device charging setup.

Still, it's important to limit your home's overall power needs if you plan on using a generator.

The generator only has an 8-hour operating time on a single tank of gas, but the power it generates is reliable and remarkably pollution-free. Hondas are famed for their durability and reliability, so expect to pay between $1,200 and $1,400 for this generator.

However, it is a prudent investment if you seek a compact power source that is also safe, strong, silent, and environmentally friendly.

Low Total Harmonic Distortion Generator 3 - Westinghouse WGen12000DF 

Westinghouse WGen12000 Ultra Duty Portable Generator - 12000 Rated Watts & 15000 Peak Watts - Gas Powered - Electric Start - Transfer Switch & RV Ready - CARB Compliant

This generator is ideal if you have a sizable home and a high daily electricity consumption. This Westinghouse generator can run for 11 continuous hours on a single tank of gas or propane. This model has a remote start, so you can turn it on without getting out of bed.

With a maximum output of 240 volts, this bad boy can easily power all of your domestic appliances in addition to your entertainment devices, so there's no need to engage in energy saving when using it. The WGen1200DF's THD is less than 5%, thus it's safe to use with even the most sensitive electronics.

The WGen1200DF doesn't come with a ST Switch, but it does have a ST Switch outlet, so you can attach a transfer switch to your breaker box and use that to automatically switch power to the generator when it's needed.

This generator is bulky and heavy, making it inconvenient to move about. It's heavy, so you can't carry it very far, even though the handles and tough exterior make it suitable for harsh terrain.

Its ability to withstand severe storms, though, makes it an excellent choice for places where such conditions are common.

Keep in mind that the manufacturer recommends against utilizing this generator in areas with dense vegetation due to the potential fire hazard it poses.

On average, this generator produces noise at a level of 74 dB. It's quieter than other generators of its kind, but it still might be too loud for your suburban neighbors if you compare it to the 75 dBA a typical vacuum cleaner makes.

The installation process is straightforward even for those with no prior knowledge with generators, but those who anticipate frequent contact with Westinghouse's technical support should be mindful of the company's notoriously long wait times and heavy call volume.

The Westinghouse WGen1200DF is available for around $2,500. If you live in an area prone to storms and want to be ready for the next power outage, this model is the best option.

Low Total Harmonic Distortion Generator 4 - WEN 56380i

WEN 56380i Super Quiet 3800-Watt RV-Ready Portable Inverter Generator with Fuel Shut-Off and Electric Start

This reliable and safe generator can be used to power your delicate and often pricey devices.

A 212cc 4-stroke engine finally provides 3800 surge watts and 3400 rated watts of power.

Due to its large gas tank, it can operate for 8.5 hours on a half loaf, making it ideal for camping trips or power outages that last all day.

It provides power with a total harmonic distortion of less than 1.2%, making it the cleanest option available.

Low Total Harmonic Distortion Generator 5 - WEN DF475T 

WEN DF475T Dual Fuel 120V/240V Portable Generator with Electric Start Transfer Switch Ready, 4750-Watt, CARB Compliant

Powerful and completely safe for your electronic equipment, this generator is a great choice.

With its 224cc 4-stroke OHV engine, which generates 4750 surge watts and 3800 running watts on gasoline and 4350 surge watts and 3500 running watts on propane, this generator is one of the most powerful on the market.

To prevent damage to your electronics, it has an in-built automatic voltage regulator and overload protection. This guarantees a clean and steady energy supply.

This WEN generator has a few minor issues, such as a pull cord that is awkwardly located within the body, but it makes up for this with a wide range of beneficial features, such as the ability to run on gasoline or propane and the high number of different outlets.

Low Total Harmonic Distortion Generator 6 - Champion 76533

Champion Power Equipment 76533 4750/3800-Watt Dual Fuel RV Ready Portable Generator with Electric Start

As electronic devices become ever more integral to our daily lives, it becomes increasingly important to invest in a backup power source that won't compromise their integrity.

If you're looking for a portable generator that can safeguard your electronics from surges, go no further than the Champion Power Equipment 76533, which comes equipped with a built-in surge protector called "Volt Guard."

Powering your essential electronics is not a problem thanks to the 224 cc engine's 4750 peak watts and 3800 watts in use. It can power a typical home for a day when used continuously for 9 hours at 50% load.

Finally, the generator's operation is only audible to an extent (68 dBA), despite its high power output. This is very good.

Low Total Harmonic Distortion Generator 7 - Westinghouse iGen160

Westinghouse iGen160s Portable Power Station and Solar Generator, 150 Peak Watts and 100 Rated Watts, 155Wh Battery for Camping, Home, Travel, Indoor and Outdoor Use (Solar Panel Not Included)

Because of its robust engine, which allows you to relax in the knowledge of how reliable it is, and its short circuit, overload, and temperature precautions, the Westinghouse iGen160 portable generator is among the best for safeguarding your electronic devices.

Its lithium ion battery has a 155-watt-hour capacity, so it can power even your most demanding electronic gadgets. At just 3.75 pounds, it's also one of the least heavy of the generators considered here.

The generator may not have the highest wattage, but it has other benefits that make up for this, such as the fact that it does not require an engine, which reduces the need for costly and time-consuming maintenance.


If you're searching for a generator with a low THD, you've come to the right place. Go and check out the generators on this list, then see if they are what you need from a generator and if they are within your budget. 

About Tom Bell

Hey, I’m Tom, the owner of Generator Reviews! I built this website to help you get the very most out of your generator and select the correct one for your personal circumstances. This site contains reviews of virtually every generator, detailed buying guides, as well as maintenance advice to help you keep yours in tip-top shape!


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