Generac Portable Generator Review

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Generac is one of the best-known manufacturers in the generator industry, and for a good reason.

While Generac may not have the name recognition of Honda or Yamaha when it comes to engines, the company has been able to compete on performance at a much lower price over its 60-year history. When you get the best Generac generator, you can be assured that you’re getting a model that will last and offer all of the features you need.

In order to help you find the best Generac generator, we looked through the company’s entire lineup and considered a number of important factors. First, we looked at different types of generators – conventional and inverter generators, as well as portable and standby generators.

All of these generator types are designed for very different purposes.

Within each category, we looked at the rated and maximum power output of each model, the types of fuel it is able to run on, and how long each generator can run for. We spent tens of hours reading technical specifications from Generac as well as customer reviews about each of their generators to come up with our five favorite Generac models, highlighted in the table below.

After that, you’ll find detailed reviews of each generator, complete with pros and cons.

Our buying guide covers everything you need to know about choosing the right Generac generator for your needs. Finally, we sum up our three overall favorite generators in Generac’s current lineup. House Grail is reader-supported.

When you buy via links on our site, we may earn an affiliate commission at no cost to you. Generators come in many sizes, shapes, and power levels.

Some are loud and obnoxious while others are quiet enough to take camping without disturbing nature.

Whether you’re looking for a generator as the main backup for your home in an emergency situation or to power a job site full of tools, Generac generators provide a high level of reliability trusted by many.

Inverter generators are small and quiet but they don’t pack much power into their smaller frames. Other generators that weigh up to 400 pounds are mounted on wheels for transportation and can power a large home or job site all day.

We’ve tested 10 of the best Generac models of all types and have written these in-depth reviews comparing them to help make your decision easier.

Can power a whole house. No voltage drops. Can run a 5-ton air conditioner. One-touch electric start. Covered outlets. More affordable. 5 gallons lasts 12 hours.

If you’re looking for a quiet, portable, gas-efficient Generac generator, look no further than the GP2200i. Weighing in under 50 pounds with a very small form factor, this generator is the definition of portable.

Conclusion – Generac Portable Products Deliver that Watts Power to Your Home & Work

The 2,200 watts of power it provides is a bit on the low side.
That said, it offers a parallel feature that allows you to double your power by hooking two inverters together.
  • 10.0
    AR Score

    Since this unit is very affordable, you could have a parallel setup for less than the cost of many other Generac models. The eco-mode allows for extra-efficient low-power operation at a very quiet noise level.

  • Of course, this generator is never loud.

It was one of the quietest models we tested, making it a great choice for camping.

It was also very conservative with fuel, running for more than 10 hours at 25 percent load on just a single gallon of gas.

Our only real complaint was that the plastic casing is not built to withstand any abuse.

As long as you treat this machine well, it should provide you great service for a long time.

We feel confident recommending the Generac GP2200i portable inverter generator as our top pick. Very small and portable.

Eco-switch for efficient operation.

GENERAC GP3600 Model #7677


Can run two in parallel. Whether you need a generator to power an entire job site’s worth of tools or you just need a reliable backup generator with enough juice to power your house in case of an outage, the Generac 5734 GP15000E is a stout unit that packs 15,000 watts of power.
  • 9.8
    AR Score

    It can easily power an entire house or job site and you’ll be unlikely to experience any voltage drops. Even better, the electric start built into this machine makes it very easy to get started, unlike older machines that made you yank and yank on a pullcord until your arm was exhausted.

  • We noticed one strange drawback that was later confirmed by Generac.

This generator has plenty of power, and it wants to use it. If you ask it to run below 25 percent capacity, you will experience flickers and voltage spikes as the engine RPMs fluctuate.

Also, this is a very loud and heavy unit that’s not easy to move around, despite the large wheels. Our complaints with the GP15000E are relatively minor, and when you consider all of the power packed into this generator, we believe it’s one of the best Generac portable generators for the money.

15,000 watts of power. Can power a whole house. No voltage drops. Doesn’t run well below 25% capacity.

Very loud and heavy. Are you looking for the most powerful model with all the features and you don’t mind spending the money to get it?

the Generac 5735 GP17500E gas powered portable generator is a premium choice that can power almost anything, even a 5-ton air conditioner.

All of that power turns on easily thanks to the electric start and battery.

This robust unit is also very reliable, perfect for those who need a dependable unit as a backup for their home in case of an emergency.

With so much power come a few downsides.

1. Generac 7117 Portable Inverter Generator – Best Overall


First off, this is a very large and extremely heavy unit, tipping the scales at almost 400 pounds.
  • 9.6
    AR Score

    The worst drawback though is the awful gas-efficiency. At a load of 50 percent, you can expect this machine to run for 10 hours on 16 gallons of fuel. While it does make gobs of power, it’s far from efficient which is going to cost you in the long run.

However, we feel it’s one of the best options available overall and is worth the extra cost if you can afford it.

Can run a 5-ton air conditioner. Electric start. Very expensive.

Nearly 400 pounds. Terrible gas efficiency. Packed with convenient features, the Generac 5802 gas powered portable generator provides 10,000 running watts of power.

Though it’s just as big, loud, and heavy, this isn’t nearly as much power as other models in the same price range, which is why the 5802 doesn’t manage to break the top three.

GENERAC GP6500 COsense® Model #7683

GENERAC GP8000E COsense® Model #7676

One-touch electric start makes it easy to get it running.
  • 9.4
    AR Score

    The outlets are all covered for protection from the elements. Shortly into testing, the voltage regulator on our burnt out. Luckily, this unit is covered by a two-year warranty for residential use, so we were able to get it repaired quickly.

  • After a few more weeks of occasional use, we discovered another problem.

Some of the connections on the control panel came out from the vibration of the unit. This oversight should have been caught by Generac, but apparently, it’s a pretty common occurrence.

One-touch electric start. Covered outlets for environmental protection.

Voltage regulator burns out. Vibration sensitive connections fall out.

At about half the price of the highest-end Generac generators, the GP8000E will be attractive to many for the price alone.

The 8,000 watts of power it provides isn’t spectacular, but it’s sufficient for running a smaller sized job site or as backup power for a home.

At just under 200 pounds, this model is on the lighter side and is considerably more portable than many of the other ones that we tested.

Our top pick – Generac GP3500iO Open Frame Portable Generator 3,500 Watt

10. Generac 7677 Portable Generator

Another highlight was the improved gas-efficiency over some of the more powerful generators.
  • 9.2
    AR Score

    This one will run at a 50 percent load for 12 hours on 7.5 gallons of fuel. Certainly not as good as the inverter generators, but pretty decent for the power this motor creates.

  • Even though this model is a bit lighter than some of the others, it’s no smaller.

It’s also a bit louder, even though it doesn’t manage to produce as much power. In the winter, we noticed some temperamental behavior in the cold weather. Starting was more difficult and the unit wanted to die several times until it got warmed up.

This is a great generator, though it doesn’t provide quite enough value to make it into our top picks. More affordable. Lighter weight.

5 gallons lasts 12 hours. If you’re looking for sufficient power but don’t want to break the bank to get it, then the Generac 5939 GP5500 is one of the portable generators you should be considering.

Priced at the low end of the spectrum, this is still a very capable machine. While not the most fuel-efficient one available, it is still more conservative than many other models, getting 10 hours of run time from 7 gallons of fuel.

Weighing just 180 pounds and equipped with two wheels for easy transport, this is one of the more portable full-sized Generac generators on the market.

We did enjoy the power for the price, but it’s not enough for a large job site or home. It may be fine for a smaller work crew or backup for a small home though.

Generac Portable Generator – Generac 7129 GP3000i Powered Portable Generator

6. Generac 5939 Gas Powered Portable Generator

The carburetor also gave us some trouble when the plastic choke lever broke.
  • 9.2
    AR Score

    This is a pretty common issue on this model so be aware. The GP5500 also seemed to have a shorter lifespan overall than the other models in the lineup. Low power, 5,500 watts. Short lifespan.

  • Plastic choke lever on carb a common breaking point.

If small size, portability, and quiet operation are of prime concern to you, then the Generac 6866 iQ2000 inverter generator is an option you may consider.

To start, it’s very fuel-efficient, running for almost six hours on just one gallon of fuel.

It’s also one of the quietest generators we tested, impressing us with its near-silent operation.

It’s not very powerful though, producing just 1,600 watts. To remedy this, you can run two of these units in parallel and create twice the power.

This generator would have probably ranked much higher if it was more reliable.

Best Home Backup Power Generator – Generac 7682 GP6500E Portable – 6,500 Watt Electric – Orange, Black

Runner up – Generac 7678 GP3600 Portable Generator – 3,600-Watt Power

It failed on us one of the first times we used it.
  • 9.2
    AR Score

    It’s covered by a three-year warranty so repairs are no problem. That said, we want a generator that we can count on not to let us down at a critical moment. To that end, we have to suggest you opt for a more trustworthy model such as the GP2200i in our first position.

Low power, 1,600 running watts. Quiet, small, and light, we expected good things from the Generac 7127 iQ3500 portable inverter generator.

It didn’t manage to live up to our hopes, but it does have some positive qualities. For starters, it’s very quiet and rather compact as well.

At only 100 pounds it’s also pretty light, though it’s still difficult to move because the size and weight make it very awkward.

This model could definitely benefit from the addition of some wheels. There is an LCD readout, but it’s small and very difficult to see.

While it’s got a small footprint, it doesn’t make a whole lot of power. The 3,500 watts is sufficient, though it’s a very expensive unit considering the power it provides.

8. Generac 7127 Portable Inverter Generator

9. Generac 7676 Portable Generator

It also vibrates a lot more than we expected, slowly migrating over the course of a few hours.
  • 9.0
    AR Score

    There’s no fuel gauge to determine your fuel level which is pretty inconvenient. In the end, this model didn’t quite pan out how we hoped, and we recommend looking at some of the other models that placed higher on our list.

  • 100 pounds and no wheels.

Display is small and hard to read. Heavy vibration. Expensive for the power level. Coming in right under 200 pounds, the Generac 7676 GP8000E portable generator is just about middle of the pack in terms of weight.

It’s still very large though and takes up quite a bit of space.

8,000 watts isn’t the most powerful output from available from a Generac, but you wouldn’t know that from the noise.

The GP8000E is one of the loudest models we tested, and we suggest earplugs for when it’s running.

We were thankful that this model was very easy to get up and running with the built-in electric start.

However, you need to be vigilant about checking the battery. If it’s less than 100-percent charged, the machine will not start.

GENERAC GP2500i Model #8250

Intended Use

This could leave you high and dry at a critical moment and is one of the reasons that this device doesn’t earn our highest recommendations.

Prone to leaks.

Electric Start: About Generac & Portable Generators

Generac Budget Alternative – Generac 7117 GP2200I Inverter Portable Generator

Takes up a lot of space. Won’t start if battery isn’t 100%. With a more compact size than some of the higher-end Generac generators, the GP3600 is a more portable, less obtrusive option.

Generac Industrial alternative – Generac 5939 GP5500 Powered Portable Generator

At just over 100 pounds, it’s light enough to carry, but thankfully has wheels for easier transportation. Pricewise, this is one of the most affordable units in the Generac lineup, making it attractive to many.

Though it’s compact for a gas generator, it’s pretty large for the low power output it’s capable of.

Best Overall Power Generator – Generac 7676 GP8000E Portable, 10,000 Watts

Worse yet, it’s extremely loud, making nearly as much noise as the most powerful and largest models that we tested. While it’s a very adequate generator with no glaring shortfalls, it’s just not a great value considering the power and size.

7. Generac 6866 Gas Powered Inverter Generator

We feel that other generators at a similar price point offer far more features and better function. Only 3,600 running watts. Doesn’t provide enough power. Loud for the power.

A Quick Comparison of Our Favorites in 2022

At this point, you should have a pretty good idea of which Generac model is going to fit your needs best.

To help make the point a little more clear, we’re going to briefly cover which features you ought to keep in mind when deciding which model to choose. At the end of the day, what you plan to use your generator for is going to be the biggest determiner of which model you should choose.

If you want a generator to quietly power your electronics while you’re out camping, then you’re looking for a small and quiet inverter generator. Do you need enough juice to run an entire job site of power tools? You’re going to need a much beefier generator.

Once you know how you want to use your generator it will be easier to pick one that suits your situation. Naturally, more powerful generators tend to make more noise. That’s not the end of the story though. Full-size rolling generators are much louder than the small and efficient inverter type.

Although both types run on gas, they make very different amounts of noise. If noise is of utmost concern, you’ll want to stick to the inverter style generators. All of the generators we’ve reviewed here are technically portable.

The 10 Best Generac Portable Generators

That said, some are much easier to move about than others. Do you need to get your generator into a truck bed for transport from job to job? If so, a 400-pound behemoth may not be as portable as it looks, despite the pull handle and wheels.

Inverter generators have a much smaller form factor and are therefore much more portable. Of course, they also can’t provide the same level of power. If you need the high-power of a rolling generator, make sure to pay attention to the overall weight of the unit.