GENMAX 9000 GM9000iE Review (& Alternatives)

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Find out in this GENMAX 9000 GM9000iE review whether this inverter generator is the right choice for you and what alternatives there are.

GENMAX 9000 review in short

On paper, the GENMAX 9000 GM9000iE looks like a nice quiet 9000 watt generator.

However, with how common technical issues are, you likely want to turn to other good 9000 watt generators instead.

For example, you will likely prefer the Champion 201067 9000 over the GENMAX 9000 if you don’t mind a few decibels more.

Additionally, you can put two smaller but more reliable generators in parallel.

There will still be some cases where the GENMAX 9000 GM9000iE is the right choice but these will likely be the exceptions.

GENMAX 9000 GM9000iE


  • Very quiet for this power level
  • Nice run time
  • Has a 50 amp outlet
  • Remote generator operation


  • Technical issues are somewhat common
  • Short warranty
  • Hard to get help from customer support
  • Somewhat pricey
  • Heavy weight can be challenging to move around
  • Not that fuel-efficient

Some of the best uses for the GENMAX 9000 include:

  • Camping
  • RV’s
  • Construction sites
  • Tailgating
  • Small businesses like food trucks
  • Running certain power tools
  • Theoretically home backup power but the GENMAX 9000 does not look reliable enough for this

GENMAX 9000 performance in important categories

On top of the mini review, pros, cons, and uses, it can be helpful to see how the GENMAX 9000 GM9000iE performs in a few important categories.

Performance CategoryGENMAX 9000 Score*Performance CategoryGENMAX 9000 Score*
Power Capacity8.5Fuel Efficiency5
Run Time9Ease Of Use8.5
Quiet Operation8.5Portability5
THD<5%Price Category$$$$
Reliability Reputation6Overall Expert Rating6.5
Current PriceCheck Price
GENMAX 9000 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 9000 key features

While other details can matter too, you get a relatively good idea of what to expect from the GENMAX 9000 by looking at a few key features.

FeatureGENMAX 9000
GM9000iE Detail
Fuel TypeGasoline
Starting Watts9000 Starting Watts
Running Watts7600 Running Watts
Run Time @25% Load14.5 Hours
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 9000 GM9000iE key features

*Warranties can vary from seller to seller

**Price category at the time of writing

What will the GENMAX 9000 run?

It is easy to see that the GENMAX 9000 GM9000iE has 9000 starting watts, 7600 running watts, 240 volts, and a 50 amp outlet.

However, what these details mean in terms of devices you can run is not always clear.

There is more to say about what a 9000 watt generator can run but a few quick notes can help you get an idea of whether the GENMAX 9000 GM9000iE offers the right amount of power.

When it comes to running individual devices, the GENMAX 9000 GM9000iE should be able to run most of the things you can find besides maybe a few really big machines.

For example, this inverter generator should have no issues with running things like a 3-ton central air or a clothes dryer.

That being said, you would likely also want to run multiple devices with your GENMAX 9000 GM9000iE.

You would preferably do the calculations for your specific devices but one combination you should be able to run is a coffee maker, 2-ton central air, refrigerator, circular saw, and toaster.

Keep in mind that you may need to implement a certain start-up sequence, that device brand power needs can vary, and that you still want to implement generator safety guidelines.

GENMAX 9000 customer reviews insights

If you would only look at the features in this review, the GENMAX 9000 GM9000iE would look promising.

However, you want to keep in mind that the generators customers actually get can sometimes have technical or convenience issues that are not in the features.

This is actually the case for the GENMAX 9000 GM9000iE to a relatively large extent.

While there are happy customers too, there are also a good amount of reviews where the GENMAX 9000 GM9000iE does not perform (as desired).

The exact technical issues in these reviews vary but the main conclusion is that the customers are not really able to use the GENMAX 9000 GM9000iE.

On top of that, it seems to be really hard to actually get help from GENMAX customer support. Even when customers are still within the warranty duration.

In short, it looks like the GENMAX 9000 GM9000iE is not that reliable which is especially suboptimal for purposes like home backup power.

GENMAX 9000 alternatives

With the technical issues in the customer reviews it is only normal to search for alternatives to the GENMAX 9000.

Your best bet when it comes to similar generators is the Champion 201067 9000.

This 9000 watt generator is louder than the GENMAX 9000 but its reliable performance and the more budget-friendly price will often be worth this.

Another option is running two less powerful but more reliable generators in parallel to get similar amounts of watts.

You can also check out the GENMAX GM9000iED review if you are interested in a strong dual fuel inverter instead but keep in mind that this model also has its issues.

Additionally, the GENMAX 9000 vs Predator 9500 comparison can be an interesting read too.

Is the GENMAX 9000 worth it?

As this review should make clear, the GENMAX 9000 GM9000iE is not the most reliable inverter generator out there.

It is possible that there are some people who just want the quietest 9000 watt generator they can get and don’t mind the possibility of technical issues.

However, if you don’t mind the extra decibels you will likely prefer the Champion 201067 9000 which would make the GENMAX 9000 GM9000iE not worth it.

Another option is running two smaller but higher-quality generators in parallel to get similar amounts of watts.

In short, while there are exceptions, many people will prefer other options over the GENMAX 9000 generator.

GENMAX 9000 GM9000iE

Other GENMAX 9000 GM9000iE specs

You may find some of the GENMAX 9000 GM9000iE specs I did not mention in the review yet helpful for making your final conclusion about this generator.

Additionally, the GENMAX 9000 GM9000iE user manual can offer even more details that could help in your decision.

SpecificationGENMAX 9000
GM9000iE Detail
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
Weight233.7 lbs (106 kg)
Check Current Price
Other GENMAX 9000 GM9000iE specs


How long will a GENMAX 9000 run?

A GENMAX 9000 will run about 14.5 hours at 25% load on a full tank of gas.

How much oil does a GENMAX 9000 take?

The GENMAX 9000 has an oil capacity of 1.1 quart which is about 35.2 fluid ounces or 1 liter.

How many decibels is a GENMAX 9000?

A GENMAX 9000 is about 62 dBA at 25% load and 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.