5 Best Large Inverter Generators For Clean Power

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Discover the best large inverter generators for home backup power, running an RV, and more without worrying about your sensitive electronics.

  1. Champion 201067 9000Best large inverter generator for home backup power, RVs, and more
  2. Predator 9500 (9500 peak watts) (67 dBA)
  3. Duromax XP9000iHBest large dual fuel inverter generator
  4. Honda EU7000iSQuietest large inverter generator (7000 peak watts) (52 dBA)
  5. Westinghouse iGen4500Best not so large inverter generator (4500 peak watts) (52 dBA)

Since large is somewhat subjective I also included the Westinghouse iGen4500 for people who don’t need as much power but still want a good inverter generator.

Additionally, keep in mind that there is no perfect ranking for everyone. Models lower on the list can be better for your personal needs and preferences.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Champion 201067 90008.576.5<3%9.57.587$$Check Price
Predator 95009.597.5Clean
THD
8.58.57.55.5$$$$Check Price
Duromax XP9000iH99.57.5<5%7.5985.5$$$$Check Price
Honda EU7000iS6.58.59.5<3%97.59.55.5$$$$$$Check Price
Westinghouse iGen4500599.5<3%9888$Check Price
Best large inverter generators performance on a score of 10 in important categories*

*Compared to similar generators and sometimes based on customer input

1. Champion 201067 9000

The Champion 201067 9000 is the best large inverter generator thanks to the combination of solid features, reliability, and reasonable price.

With 9000 starting watts and 7250 watts you have enough clean THD inverter power to run most big devices or just a lot of small to medium electronics.

Additionally, the 50 amp outlet makes it easier to connect the Champion 201067 9000 to your house.

This in combination with the reliability reputation also makes it a great inverter generator for home backup power in power outages.

Pros

  • Champion 201067 9000 offers 9000 starting watts, 7250 running watts, 50 amps, and 240 volts
  • Noise levels of 72 dBA
  • Run time of 10.5 hours at 25% load
  • Less than 3% THD
  • Electric start
  • CO sensor
  • Four GFCI outlets
  • Weight of 152.2 lb (69 kg)
  • Relatively positive customer reviews
  • 3 years limited residential and 270 days limited commercial warranties
  • A lot of customers
  • Budget-friendly for a large inverter generator

Cons

  • Fuel efficiency and run time are not the most impressive

Even if this option would cost a lot it would be a great inverter generator for the money. However, the Champion 201067 9000 is very budget-friendly too.

The main downside of the Champion 201067 9000 you do want to keep in mind is that the 10.5 hours of run time at 25% load is below average.

You may prefer one of the other good large inverter generators with a longer run time for something like running a big air conditioning system overnight.

That being said, this does not stop many people from giving the Champion 201067 9000 the top rating and this generator from deserving the top pick spot.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Champion 201067 90008.576.5<3%9.57.587$$Check Price
Champion 201067 9000 performance on a score of 10 compared to similar alternatives

2. Predator 9500

The Predator 9500 is a great 9500 peak watt inverter with a relatively quiet operation but there are also reasons that it is not the number one spot.

First of all, the biggest capacity outlet of the Predator 9500 is “only” 30 amps. This is still enough for many appliances and tools.

However, it also makes this large inverter less suited for home backup power in terms of connection convenience and the watts you can get out of one outlet.

Additionally, while there are definitely customers with different experiences, Predator generators generally do not have the best reputation for durability and reliability.

Pros

  • Predator 9500 offers 9500 starting watts, 7600 running watts, 30 amps, and 240 volts
  • Parallel capability
  • Relatively low noise levels of 67 dBA
  • Nice run time of 18.5 hours at 25% load
  • Clean THD power
  • Electric start
  • Weight of 257 lb (116.6 kg)
  • Four GFCI outlets
  • CO sensor
  • Relatively positive customer reviews
  • 2 years limited emissions control system and 90 days limited product warranties

Cons

  • Short warranties
  • Does not have a 50 amp outlet
  • Durability reputation can be better

The short warranties are also not that promising in this area.

That being said, the Predator 9500 could still be worth the money for people who have enough with a 30 amp outlet and value quiet operation.

For example, for things like RVs, camping, running power tools, and food trucks, the Predator 9500 could be the right option.

This is the most powerful option on this list too although it is not quite the largest inverter generator on the market.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Predator 95009.597.5Clean
THD
8.58.57.55.5$$$$Check Price
Predator 9500 performance on a score of 10 compared to similar alternatives

3. Duromax XP9000iH

The Duromax XP9000iH is the best large dual fuel inverter generator with as the name implies, 9000 starting watts of power.

DuroMax XP9000iH

One first thing you do need to know is that you may need to use multiple outlets to get all these watts since the DuroMax XP9000iH does not have a 50 amp outlet.

Additionally, there are some cases where customers initially get a generator that does not work as desired or experience early wear and tear.

When these issues are within the warranty period they tend to get resolved. However, during something like a power outage you likely prefer something you can rely on.

Pros

  • DuroMax XP9000iH offers 9000 starting watts, 7600 running watts, 30 amps, and 240 volts (gasoline)
  • Parallel capability
  • Dual fuel so can run on propane (LPG) too
  • Noise levels of 68 dB
  • Good run time of 20 hours at 25% load
  • Less than 5% THD
  • Electric and remote start
  • Four GFCI outlets
  • CO sensor
  • Weight of 237 lb (107.5 kg)
  • 3 years limited residential and 1 year limited commercial warranties
  • A lot of customers

Cons

  • Does not have a 50 amp outlet
  • Some cases of early technical issues
  • A few cases where the generator does not offer the running watts mentioned

These potential downsides do need to be mentioned but the DuroMax XP9000iH still gets a spot on the list of the best large inverter generators for a reason.

Its dual fuel feature allows you to run on propane too which can be helpful in situations and areas where gasoline is not as convenient to get.

For example, because propane stores longer than gasoline, you may still like the DuroMax XP9000iH for home backup power in certain areas or off-grid living.

Another impressive detail of this big inverter generator is the run time.

Running for 20 hours on a full gasoline tank at 25% load should be more than enough to run an (RV) AC overnight so you can get a good night of sleep.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Duromax XP9000iH99.57.5<5%7.5985.5$$$$Check Price
Duromax XP9000iH performance on a score of 10 compared to similar alternatives

4. Honda EU7000iS

The Honda EU7000iS is the quietest large generator thanks to its quiet operation.

The other models on this list are relatively quiet compared to other big portable generators but it is clear that the Honda EU7000iS is in its own decibel level league.

More specifically, this 7000 watt generator is rated for 52 to 58 dBA at 25% to 100% load (typically measured at 23 feet aka 7 meters away).

Considering a normal conversation is about 60 decibels, it becomes clear that the Honda EU7000iS is great for things like (RV) camping, food trucks, and events.

However, an important detail that will turn many people away from this large inverter generator is the high price tag.

Pros

  • Honda EU7000iS offers 7000 starting watts, 5500 running watts, 30 amps, and 240 volts
  • Parallel capability
  • Quietest large inverter generator with 52 to 58 dBA (25% to 100% load)
  • Nice run time of 16 hours at 25% load
  • Should be less than 3% THD
  • Electric start
  • Honda generator brand reputation
  • Remote operation through Honda My Generator app
  • Four GFCI outlets
  • CO sensor
  • Weight of 263.2 lb (119.4 kg)
  • Relatively positive customer reviews
  • 3 years limited residential and 12 months limited commercial warranties

Cons

  • Expensive compared to other large inverter generators
  • A few exceptional cases of technical difficulties
  • Does not have a 50 amp outlet

Honda generators do have a reputation for quality and the Honda EU7000iS makes usage very convenient but at some point, the investment required just becomes too big.

As the happy customer reviews imply, this could still be the best large inverter generator for you.

At the same time, the lack of a 50 amp outlet and a few cases of technical issues do make it clear that the Honda EU7000iS is for certain specific needs, preferences, and budgets.

If you don’t need the full 7000 starting watts but do like silent operation, you also consider one of the more budget-friendly quietest 30 amp generators.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Honda EU7000iS6.58.59.5<3%97.59.55.5$$$$$$Check Price
Honda EU7000iS performance on a score of 10 compared to similar alternatives

5. Westinghouse iGen4500

This selection of top picks focuses on inverter generators that are large compared to all portable models available.

However, because there will also be people that don’t need the full 7000+ starting watts, I also included the Westinghouse iGen4500 which offers a nice 4500 starting watts.

Westinghouse iGen4500

4500 watt generators can still run things like certain 15k BTU window ACs, table saws, or 1 HP air compressors.

If this sounds like enough clean THD inverter power, the Westinghouse iGen4500 is basically the best option available.

Pros

  • Westinghouse iGen4500 offers 4500 starting watts, 3700 running watts, 30 amps, and 120 volts
  • Also available in dual fuel version
  • Parallel capability
  • Low noise levels of 52 dBA
  • Long run time of 18 hours at 25% load
  • Less than 3% THD
  • A lot of performance tracking metrics
  • Optional remote start or CO sensor
  • Weight of 104.7 lbs (47.5 kg)
  • Relatively positive customer reviews
  • 3 years limited residential and 1 year limited commercial warranties
  • A lot of customers
  • Budget-friendly

Cons

  • Navigating bumpy terrain can be inconvenient
  • Some customers find adding oil challenging

There are a few exceptional mentions of a challenging oil fill design and that the portability is not ideal with the small wheels.

However, these are only tiny downsides when you consider the quality features and reasonable price of the Westinghouse iGen4500.

For example, the 18 hours of run time on a full tank of gas at 25% load is useful for purposes like running an RV air conditioner overnight or just having fewer refuel sessions.

Additionally, the 52 dBA noise rating is still impressive even though the Westinghouse iGen4500 does offer less power than the Honda EU7000iS.

In short, if 4500 peak watts and 3700 running watts are enough for your needs, you will likely prefer the Westinghouse iGen4500 even though it is not the largest inverter generator on the list.

Brand ModelPower
Capacity
Run
Time
Quiet
Operation
THDReliability
Reputation
Fuel
Efficiency
Ease
Of Use
PortabilityPrice
Category
Current
Price
Westinghouse iGen4500599.5<3%9888$Check Price
Westinghouse iGen4500 performance on a score of 10 compared to similar alternatives

What to pay attention to in a large inverter generator?

The things to pay attention to in a large inverter generator are:

  • Power capacity
  • Outlets
  • Portability
  • Run time
  • Noise levels
  • THD levels
  • Fuel consumption
  • User reviews
  • Anecdotal reviews from experts
  • Price
  • Brand trustability and reputation

To choose a large inverter generator you want to think about what you want in these areas and find a machine that aligns the best with your situation.

What is the best large inverter generator?

The best large inverter generator is the Champion 201067 9000 with 9000 starting watts, other solid features, and a reasonable price.

If this sounds too big for your needs you can also go for something like the more medium-sized Westinghouse iGen4500.

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Author:

Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.