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Size & Power

Top 5 Best Inverter Generators for 15000 BTU Air Conditioners Reviewed

No matter if you’re in the house or hitting the road with your RV, there’s no escape from the burning heat of the summer. A powerful air conditioner is your best friend in this situation. But what about when the power goes off? You can’t just plug your AC into any generator out there. Air conditioners like every other sensitive electrical appliance require a steady and clean flow of energy, which most conventional generators can’t guarantee.

For getting the most out of your AC even during a power outage, you need to lean towards an inverter generator. Inverters are famous for so many different reasons. They’re quiet, fuel-efficient, and most importantly, they produce clean energy. However, some inverters still struggle to power high voltage electronic devices and picking one from the thousands of available options can be a drag.

If you’re not sure about which inverter to choose, you are in great luck! We narrowed down the list from hundreds and came up with the 5 best inverters that can power a 15000btu air conditioner. Here, we’ll share our experience with these units from which you can draw a picture of how they’ll work for you.

5 Best Inverter Generators for 15000 BTU Air Conditioners

01 CHAMPION 100302 4000-Watt (Editor’s Choice)

CHAMPION 100302 4000-Watt

Why It Stands Out to Us

Coming from one of the leading power equipment brands, our top pick offers astonishing performance in all the categories you can name. This incredibly portable inverter produces enough electricity to power tons of electric devices that you might use in your house or RV. Besides, it saves you from the annoying noise of a generator. With this, you’ll never run out of power outlets. Despite offering an all-around service, this model won’t fall too heavy on your wallet. We recommend anyone who’s looking for an inverter generator to go for this one.

Our Experience With the Champion 4000-Watt

  • Like all Champion generators, this one has a black and yellow appearance. The build quality seemed perfect.
  • We gave the user manual a quick read before starting the generator. It had all the information you’d want. The generator was ready to use within just ten minutes.
  • Though this model doesn’t feature an electric or remote start, the recoil start was on point. Pulling the cord was fairly effortless and we never needed a second pull to start the engine.
  • While testing the unit in houses and RVs, we powered a lot of electric appliances with it. It ran for about 16 hours with a half load on a full tank. With a full load, we got 12 hours of service without having to refuel.
  • We connected a lot of sensitive electronic devices to the generator and it handled all of them perfectly. It produced clean energy throughout the time of operation. This model seemed more than capable of handling a 15000btu AC.
  • The operational noise was satisfactory. Though it wasn’t completely silent, it was quieter than most generators we tested so far.
  • Champion generators never fail to impress considering the availability of important power outlets and this one was no exception. It features all the necessary outlets that you can expect from an inverter.
  • It weighs less than 90lbs and we could carry it easily. The wheel kit and the handle worked fine.
  • We checked the low fuel shutoff feature a few times and it worked flawlessly every time. The manufacturers had to cut a few corners to keep the price low and we were glad that they didn’t exclude this feature.

What We Didn’t Like

  • This generator doesn’t feature an electric or remote start.
  • We had to buy the wheel kit separately.

What Could Be Improved

  • The addition of remote control would make it a way better product.
  • Champion Power Equipment could include a wheel kit in the package.


  • Dimensions: 20.5x 17.9x 17.7 inches
  • Weight: 81.6 pounds
  • Wattage: 4000 (starting), 3500 (running)
  • Engine: 224 cc
  • Fuel Type: Gasoline
  • Warranty: 3-year limited


  • Portable
  • Easy maintenance
  • Easy to use
  • Amazing design
  • Affordable price
  • 3-year warranty


  • No electric or remote start
  • Wheels not included.

02 Generac 7127 iQ3500-3500 Watt

Generac 7127 iQ3500-3500 Watt

Why It Stands Out to Us

This outstanding inverter comes with a wide range of features and functionalities. For starters, it runs quietly. This box-shaped compact device may not look like much but it’s more than capable of running multiple electrical appliances at the same time. Also, it produces clean energy, which is essential for complex and sensitive devices. This generator has gained popularity for its amazing compatibility with RVs. Overall, the Generac 7127 iQ3500 offers great performance in all categories. If you love to always be on the move, this is the inverter to go for.

Our Experience With the Generac 7127 iQ3500

  • Straight out of the box, we loved the design and build quality. It looked like an oversized briefcase at first glance. The color combination and the material was also satisfactory.
  • We could set it up quite easily. We opened the front panel and connected the wires with the battery. Then we opened the side panel and filled up the tank. It was ready to run in just 5 minutes.
  • Both of the starting methods worked flawlessly. We used this model for about 3 weeks and it hardly required a second attempt to start regardless of the methods we used.
  • The noise level was very low. We found out that it’s one of the quietest inverters we used. Regarding operational noise we would rank it  lower than the Westinghouse iGen4500 and higher than the rest of the models on this list.
  • We were surprised with the number of appliances it handled at once. We powered an LED TV, a refrigerator, a sound system, a router, several lightbulbs, and two fans with it and the unit showed no sign of weakness.
  • While testing its compatibility with RVs, we powered a 15000btu ac, two fans, and charged our phones at the same time. We also used it while we were out camping. We can confirm that this inverter is suitable for outdoor use.
  • The quality of the LCD display isn’t anything out of ordinary but we were satisfied with it because the data it showed seemed accurate every time.

What We Didn’t Like

  • It’s heavier than most 3500W generators.
  • The price is a little high.

What Could Be Improved

  • At this kind of price, the manufacturers could add a remote control
  • It would be a way better product overall if a pair of wheels were included in the package.

Our Recommendations:

  • For running a 15000btu AC, connect the AC to the inverter first. When it starts running, add other appliances that consume less electricity one by one.


  • Dimensions: 23.7x 18x 21.7 inches
  • Weight: 109.1 pounds
  • Color: Orange/Black
  • Wattage: 3500
  • Warranty: 3-year limited


  • Eye-catching appearance
  • Quiet operation
  • LCD panel
  • Easy to use
  • RV-ready


  • Expensive
  • Heavy

03 Champion 100263 3400-Watt

Champion 100263 3400-Watt

Why It Stands Out to Us

You’ll find a lot of inverters with the dual fuel feature on the market. However, very few units can compete with the Champion 3400-Watt Portable Inverter Generator. The name “Champion” gives you a hint that it’s an absolute beast in terms of runtime and fuel consumption. With a whooping 3400W starting and 3100W running wattage, this bad boy generates enough juice for powering your entire house. Besides, it’s easily portable and RV-ready. Also, it offers a silent operation. If dual fuel and silent operation are your top priorities, going for this model will be the right call.

Our Experience With the Champion 3400-Watt

  • This model comes with the trademark Champion Power Equipment’s black and yellow appearance. Like every other unit of the brand, it’s made of sturdy materials that ensure great durability.
  • Setting it up was a piece of cake and we could start using it in no time.
  • Both recoil and electric starting methods worked great. Pulling the cord seemed like child’s play. Though we had some issues with the electric start after a few weeks of use, the recoil start felt like a good backup.
  • We were very impressed with the operational sound. We can confirm that it’s one of the quietest inverters on the market.
  • Most units with dual fuel don’t operate equally with both fuel types. Rather they tend to perform better with propane. But in this one, performance was almost equal with both propane and gasoline.
  • Performance in both houses and RVs was satisfactory. We powered a whole bunch of devices and it handled all of them perfectly. Besides, the runtime was great with both half and full load.
  • In terms of portability, we were very pleased. The wheel kit and the handle worked perfectly.

What We Didn’t Like

  • It doesn’t come with a 220V outlet.
  • The price seemed a bit high.

What Could Be Improved

  • At this price, the manufacturers could have easily added remote control to the unit.
  • There could be a built in hour meter.


  • Dimensions: 21.5x 17.3x 18.3 inches
  • Weight: 95.7 pounds
  • Starting Wattage: 3400
  • Running Wattage: 3100
  • Engine: 192cc
  • Fuel Type: Dual Fuel
  • Warranty: 3 years limited


  • RV- ready
  • Fuel efficient
  • EPA III and CARB compliant
  • Parallel compatible
  • 2-year warranty


  • No remote control
  • No 220V outlet

04 WEN 56380i 3800-Watt

WEN 56380i 3800-Watt

Why It Stands Out to Us

Thie WEN 56380i is one of the coolest looking inverter generators you’ll ever see. This compact device is loaded with numerous features and functionalities that you won’t see in an average unit. It produces enough juice to run a wide range of everyday electric appliances for a long time. With an electric start and a bunch of common outlets, it’s very easy to use. Wen added an ECO mode in this model. So, it’s fuel-efficient. For its multipurpose use, it works great in RVs. If you’re looking for an inverter generator for your RV, try this one out and you won’t regret it.

Our Experience With the WEN 56380i

  • We were fascinated by the looks and build quality of this device. The combination of black and orange looked fantastic on it. The design seemed very well-thought and the materials used on the exterior felt sturdy enough to last for a long time.
  • Setting up the Wen 563801 was very easy. We could start using it within just 15 minutes of the unboxing.
  • The electric start was on point and the generator started on the first try. We tested this model for about a month and it never required a second attempt to start.
  • For how compact it is, it’s incredible that it features so many power outlets. It had all the outlets that we could expect from a 3800W inverter generator.
  • We used a wide range of electric appliances and devices with the Wen 563801. It worked well to power a refrigerator, a 65” LED TV, a ps4, two fans, a sound system, laptop chargers, phone chargers, and a few lightbulbs. We also used a 15000btu AC once and it handled it perfectly.
  • In terms of runtime and fuel consumption, we were more than pleased with this unit. With a half load, it ran for about 16 hours before emptying the tank. At a full load, we couldn’t get more than 11 hours with a tank full of fuel.
  • We used it in an RV and took it on a three-day trip. We were impressed by how well it worked during the entire time. We can confirm that it’s more than suitable for RVs.
  • Considering operational noise, this generator was above average. You can’t call it silent but it’s not annoying either. It makes less noise than 70% of all inverter generators.
  • This model weighs below a hundred pounds and it was really easy to transport it from one place to another. The wheels and the handle worked perfectly for us.
  • Extra features like an hour meter and ECO mode made the unit even more convenient. Also, the low-fuel shutoff worked perfectly every time.

What We Didn’t Like

  • The runtime wasn’t the best in the world
  • Manufacturers didn’t include a remote control.

What Could Be Improved

  • Wen could have added remote control to the unit.

Our Recommendations

  • If you want to power a 15000btu AC, make sure you start it with no other appliances connected to the generator. You can add other devices after the AC starts running.


  • Dimensions: 23.2x 18x 20.1 inches
  • Weight: 99.2 pounds
  • Starting Wattage: 3800W
  • Running Wattage: 3400W
  • Engine: 212CC
  • Warranty: 2 years


  • RV- ready
  • Fuel efficient
  • EPA III and CARB compliant
  • Parallel compatible
  • 2-year warranty


  • No remote control

05 Westinghouse iGen4500 3700 Rated & 4500 Peak Watts

Westinghouse iGen4500 3700 Rated & 4500 Peak Watts

Why It Stands Out to Us

For folks who like to keep things quiet in the neighborhood, this model is a perfect choice. The Westinghouse iGen4500 makes so little noise that you wouldn’t be able to tell if it’s running. The dual-fuel engine packs enough power to run a whole bunch of electric appliances. With exclusive features like remote control and data center, it’s very easy to use. In terms of portability, you won’t find better options as well. This device will run for days and consume very little fuel. Overall, the combination of well-rounded performance and a top-notch appearance makes it a no-brainer. If you don’t care about spending some extra cash on a high-quality product, you should definitely check this one out.

Our Experience With the Westinghouse iGen4500

  • A unique and compact outlook. At first glance, we could tell that the materials used in the chassis were of premium quality.
  • We figured that the generator was very easy to use. It took a little time to set up and was ready to run in just 10 minutes.
  • All three start options (electric, recoil, and remote) worked perfectly. It started on the first attempt regardless of the starting methods. However, after several weeks of use, sometimes the electric start didn’t hold up quite well and needed a few tries.
  • The power outlets of the Westinghouse iGen4500 were satisfactory. You can’t expect more outlets from a compact generator like this.
  • The most impressive feature of this model was its quiet operation. The machine runs so quietly that you won’t be able to tell if it’s running. Even at maximum capacity, the noise level is so low.
  • In terms of fuel consumption and runtime, the Westinghouse iGen4500 performed beyond our expectations. We powered a whole bunch of appliances with it. With a 30-35% load, it ran for 17 hours on a full tank. At full load, we could get 10-12 hours of runtime, which was very impressive. This unit is more than capable of running a 15000btu AC.
  • Because of the small size and weight, the device was almost effortless to transport with the wheels. Picking it up with bare hands was easy as well.
  • The addition of an LED panel on the data center seemed like the cherry on top. All the data shown on the screen looked quite accurate.

What We Didn’t Like

  • The price seemed a bit high.
  • It doesn’t perform well after an extended period of inactivity.

What Could Be improved

  • A longer handle and another pair of wheels would make it even more portable.

Our Recommendations

  • Start the unit at least once a month. This will keep it in good condition and ensure a longer life span.


  • Dimensions: 18x 10x 15.5 inches
  • Weight: 93 pounds
  • Starting Wattage: 4500
  • Running Wattage: 3700
  • Starting methods: Recoil, Electric, Remote
  • Warranty: 3-year limited


  • Lightweight
  • Compact
  • Quiet operation
  • Remote control
  • Fuel efficient
  • Clean energy


  • Expensive

Best Inverter Generators for 15000 BTU Air Conditioners: Buyer’s Guide

Inverter Generators for 15000 BTU Air Conditioners

1. Fuel Efficiency

Inverter generators are naturally more fuel-efficient than traditional generators because they produce just as much power that’s required. However, you’ll find a lot of inverters on the market that won’t give you as much efficiency as the others. There’s no point in having an inverter generator that doesn’t save fuel. So, keep an eye on the fuel efficiency of the unit you’re planning to buy.

2. Noise Level

Noise is almost a constant element when it comes to generators. Most generators make some kind of noise while working. However, inverter generators are far better than the other category of generators in this regard. But still, you can’t call most of them quiet or silent machines. There’s no point in buying an inverter generator if it makes audible and irritating noise. So,  before going for a particular model, check if the noise level is tolerable to you.

3. Parallel Capability

Paralleling simply means connecting two generators of the same wattage for using them as a single power source. By paralleling two generators, you also add their wattage and get twice the power they produce individually.  This is a cool feature to have in your generator. However, every inverter generator doesn’t come with paralleling capabilities. So, if you want to double up on the power output occasionally, do consider buying an inverter generator with this feature.

4. Clean Energy

If you’re planning on using your inverter generator to power electronics that have sensitive microprocessors like computers or televisions, it’s a must to ensure the cleanliness of the energy. Inverter generators that offer a clean flow of energy verify two things:

  • Burning the fuel cleaner so that regular repairs are not needed and the machine itself lasts longer
  • Protecting the electronic devices by keeping the flow of energy stable

So, for the longevity of your devices and the inverter generator, make sure to go for an inverter generator with clean energy.

5. Portability

You’ll see a lot of manufacturers adding wheels to a heavy high-wattage generator and calling it portable. That’s not how it works. To be portable, your inverter generator needs to be lightweight and compact. However, you might have to sacrifice the wattage if you want a highly portable inverter generator. The solution to this is calculating the amount of power you need for your electric appliances and then going for that exact amount of wattage. This will allow you to get the most portable inverter generator without having to abandon your requirements.

6. Other Convenient Features

  1. Fuel Meter: A fuel meter allows the user to check fuel levels easily. This feature is very useful during an extended power blackout.
  2. Hour Meter: An hour meter shows the runtime of the inverter generator. Not only does this feature show you the runtime, but it also gives you insights into how fast your tank empties.
  3. Low Fuel Shutoff: This feature turns the generator off automatically when the amount of fuel in the tank drops to a certain level. It saves the machine from damages and ensures its longevity.
  4. CO Guard: Different brands use various terms like CO safety, CO shutoff, CO protection, and so on for referring to this feature. No matter what it’s called, its main feature is to keep the amount of Carbon Monoxide in check. This feature switches off the generator when the amount of this deadly gas exceeds a particular level.
  5. Remote Control: Units that facilitate this feature save you from going back to the machine again and again.

7. Budget

Inverter generators can cost you from $400 to $5000 depending on the brand and wattage. So, it’s very crucial to determine your budget before you start searching for inverter generators on the internet.  Calculate the amount of wattage and features you need in your inverter generator.

If you’re looking for something with high wattage and lots of features, make sure your budget isn’t below $1500. For mid-tier inverter generators (4000W-5000W), $700-$1000 should be enough. Lastly, you can keep your budget as low as $400-$600 if a non-branded and low on wattage inverter generator does the job for you.

Keep in mind that even a 3000W unit from a renowned brand can cost more than 6000W units of other less popular manufacturers. Besides, units with special features like quiet operation and extra portability will cost more than the others regardless of the wattage on them.

8. Warranty

Most well-known brands include some kind of warranty policy in their inverter generators. Depending on the manufacturers, you can get 1-5 years of warranty on a unit. Typically, low-budget inverter generators don’t come with any warranty or cashback policy. Also, some manufacturers include an option to expand the time on the warranty with an additional fee. So, by increasing your budget, you’ll have more chances of getting a generator with a proper warranty.

Major Differences with the Traditional Portable Generator

inverter generator for 15000

Cleanup & Maintenance Tips

    • Always use a cover when the generator is not operating
    • Clean the tank once in a while
    • Empty the fuel tank after an extended period of use
    • Remove dust from the exterior. Dust can make your unit heat up faster
    • Make sure that the battery voltage is optimum
    • Never reuse fuel
  • Don’t run your inverter generator in the rain
  • Make sure that the unit is cooled down before refueling
  • Turn it on at least once a month

About the author

Jamie Masterson

With decade-long experience as a generator technician, Jamie has worked with USA’s top generator manufacturers and suppliers as an independent contractor.

The long years of service to the industry has taught Jamie the ins and outs of troubleshooting, repairing, and maintaining all kinds of generators in home, industrial and outdoor settings.

Jamie thinks this platform is a great opportunity to share his tips and tricks with you so you can make the most of such power equipment for better living.

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