GENMAX GM9000iED Review: Is It Good Enough?

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Discover in this review whether or not the GENMAX GM9000iED is good enough for your situation and needs.

GENMAX GM9000iED review in short

When it comes to dual fuel inverters of this power level the GENMAX GM9000iED is one of the top options.

At the same time, the number of technical issues GENMAX GM9000iED customers have implies this is not the most reliable generator.

However, many of the dual fuel models on the list of the best 9000 watt generators are not that impressive either.

Your main alternative is the DuroMax XP9000iH which looks a bit more reliable but is not perfect either.

If you don’t mind giving up the dual fuel, you will likely prefer the Champion 201067 9000 over the GENMAX GM9000iED.



  • Very quiet for this power level
  • Nice run time
  • Dual fuel function allows you to run on propane too
  • Comes with a 50 amp outlet
  • Remote operation capability


  • Decent number of technical issues
  • Bulky weight can be challenging to move around
  • Somewhat pricey
  • Short warranty
  • Getting customer support can be challenging
  • Not that fuel-efficient

Some of the best uses for the GENMAX GM9000iED include:

  • RV or regular camping
  • Tailgating
  • Small businesses like food trucks
  • Construction sites
  • Running certain power tools
  • Potentially home backup power but the GENMAX GM9000iED is not the most reliable generator

GENMAX GM9000iED performance in important categories

To round out this mini review of the GENMAX GM9000iED it can be helpful to see how this generator performs in a variety of key performance categories.

Performance CategoryGENMAX GM9000iED Score*Performance CategoryGENMAX GM9000iED Score*
Power Capacity8.5Fuel Efficiency5
Run Time9Ease Of Use8.5
Quiet Operation8.5Portability5
THD<5%Price Category$$$$
Reliability Reputation6Overall Expert Rating7
Current PriceCheck Price
GENMAX GM9000iED performance on a score of 10 compared to other generators*

Individual reviews compare the specific model to portable generators in general and sometimes scores are based on customer input

GENMAX GM9000iED key features

Figuring out whether a generator like the GENMAX GM9000iED is right for you can feel overwhelming with all of the different features and details.

Luckily, you don’t have to know about every single one of these in the review to make your decision.

The key GENMAX GM9000iED features in this first table can already give a relatively good idea of what situations this generator would be good for.

FeatureGENMAX GM9000iED Detail
Fuel TypeDual Fuel, Gasoline And Propane
Starting Watts9000/8550 Starting Watts
Running Watts7600/7200 Running Watts
Run Time @25% Load14.5 Hours (Gasoline)
Noise Levels62 dBA
Outlets(1) 120/240V 30A (L14-30R)
Locking Outlet, (1) 120/240V 50A
(L14-50R) Locking Outlet,
(2) Duplexes Of GFCI 120V
20A 5-20R Outlets
THDLess Than 5%
Warranty*1 Year Limited Warranty
Price Category**$$$$
Check Current Price
GENMAX GM9000iED key features

*Warranties can vary from seller to seller

**Price category at the time of writing

What can the GENMAX GM9000iED run?

Since a generator is mainly there to power your electrical devices, what the GENMAX GM9000iED is an important detail for figuring out whether this model is for you.

When it comes to individual devices, the GENMAX GM9000iED will be able to run most things except some really big machines.

Some of the bigger appliances and tools the GENMAX GM9000iED should be able to run include a 3-ton central air conditioning system, a clothes dryer, or an air compressor.

You can also figure out how many smaller devices you can power with the guidelines in the article about what a 9000 watt generator will run.

One example of a combination the GENMAX GM9000iED should be able to run is a 2-ton central air, freezer, pressure cooker, blender, and bench grinder.

Keep in mind that the power needs of the brands you have can vary and that you still need to keep generator safety guidelines in mind.

GENMAX GM9000iED customer reviews insights

Looking at the features and price of the GENMAX GM9000iED is a good way to start the review.

However, you want to keep in mind that some generator brands don’t deliver that well on their promises.

You can find out whether this is the case for the GENMAX GM9000iED by looking at the reviews of all the customers before you.

To save you some time and effort, I did this for you and noted down some general tendencies.

The main thing to note is that there are a good number of reviews where customers have technical issues with their GENMAX GM9000iED.

Even when customers are still within the warranty period, they often find it hard to actually get help from support to resolve their issues.

On the one hand, it is fair to say that many of the similar generators also seem to deal with similar issues.

On the other hand, this is still disappointing for a generator like the GENMAX GM9000iED which many people will want to use for home backup power.

GENMAX GM9000iED alternatives

With the number of issues in customer reviews, you likely want to know whether there are any good alternatives to the GENMAX GM9000iED.

When it comes to 9000 watt dual fuel inverters for sale, your main alternative is the DuroMax XP9000iH which seems to be just a bit more reliable, has a longer run time, but also has a higher price.

That being said, this DuroMax XP9000iH is not the best in reliability either.

If you don’t mind giving up the dual fuel feature and a few extra decibels, you can consider the Champion 201067 9000.

This 9000 watt generator seems to be a lot more reliable, has a price that is a lot lower, and is still a great option.

Is the GENMAX GM9000iED worth it?

At this point in the review, you may understand that whether the GENMAX GM9000iED is worth it depends a lot on how much you need the dual fuel feature.

If you really need this, clean inverter power, and 9000 starting watts, you can consider the GENMAX GM9000iED.

At the same time, even with these needs, you may prefer the DuroMax XP9000iH for purposes like backup power since it seems to be just a bit more reliable.

If you don’t necessarily need the option the run on propane, you will likely prefer the Champion 201067 9000.

In turn, the GENMAX GM9000iED would likely not be worth it to you.


Other GENMAX GM9000iED specifications aka specs

Certain GENMAX GM9000iED specifications I did not mention in the review yet could potentially make your decision easier.

You can find most of these in the table below.

There are also cases where the extra information in the GENMAX GM9000iED user manual can help.

SpecificationGENMAX GM9000iED
Voltage120/240 Volts
Fuel Tank Capacity6.9 Gallons (Gasoline)
Fuel Efficiency
(kWh Per Gallon)
Outlet CoversYes
Engine Displacement458cc
Recoil Pull StartYes
Electric StartYes
Low Oil ShutdownYes
Fully Enclosed DesignYes
AC Frequency60 Hz
Remote StartYes
Digital Smart LCD
Hour MeterYes
Fuel GaugeYes
Wattage MeterYes
Run Time RemainingNo
Engine Type4 Stroke
Generator Operation
Parallel ReadyYes
Country Of OriginChina
Dimensions30.9″ L x 22.6″ W x 29.3″ H
Weight243.6 lbs (110.5 kg)
Check Current Price
Other GENMAX GM9000iED specifications aka specs

How long will a GENMAX GM9000iED run?

The GENMAX GM9000iED will run 14.5 hours on a tank of gasoline at 25% load.

I did not find how long this dual fuel generator would run on a 20-lb propane tank.

How much oil does a GENMAX GM9000iED take?

The GENMAX GM9000iED has an oil capacity of 1.1 qt. which is about 35.2 fluid ounces or 1 liter.

How many decibels is a GENMAX GM9000iED?

A GENMAX GM9000iED is about 62 dBA at 25% load and seven meters (23 feet) away.

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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.