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Honda EM4000SX Spec Review

The Honda EM4000SX is a portable open frame generator with a rated wattage of 3500 W and a starting wattage of 4000 W.

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Honda EM4000SXHonda EM4000SX

Get this unit while stock lasts, because Honda discontinued its production.

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Description

Zoom on the Honda EM4000SX

In summary, the Honda EM4000SX is a portable generator especially useful for:

  • RV travellers looking for even more independence
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • Handcrafting enthusiasts who wish to work on-the-go
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Professionals who want to be able to deliver results, even during a power failure

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Honda EM4000SX in use

The Honda EM4000SX

The Honda EM4000SX's design includes a gasoline-fueled 270 cc Honda iGX270 OHV 4-stroke engine. With a 120/240V output, it gives a running wattage of 3500W and also a peak wattage of 4000W (and even up to 5000 W thanks to the iAVR technology).

With a noise rating of 61 dBA (just slightly more noisy than a normal conversation), the generator features a simple traditional pull-start mechanism, but also a convenient and easy-to-use electric starter (battery included). Moreover, to offer you even more convenience, the EM4000SX can also be remotely started (separate purchase).

The EM4000SX can operate for around 16 hours at 50% load with a full tank (fuel consumption around 0.39 GPH), due to its fuel capacity of 6.2 gallons.

Outlets

The control panel features the upcoming 6 AC outlets:

Two Duplexes 120V 20A (5-20R) GFCI
120V 30A (L5-30R) receptacle
120/240V 20A (L14-20R) receptacle

It also sports 1 DC outlet: there's a 12V 8A output with which charging your batteries is made easy.

While this Honda generator is not RV Ready, its L5-30R receptacle can be used for a simple RV connection with an L5-30P to TT-30R adaptor.

Portability

The Honda EM4000SX has the following dimensions: L41.1 x W27.8 x H28.3 in. In combination with its conventional, open frame design, they provide support and allow the generator to be raised above ground level. The device has been designed for tough environments and demanding outdoor use.

As the generator's weight is 204 pounds, manually moving it or transporting it may be challenging, despite the fact that it is technically considered 'portable' (movable). Still, once it is on the ground, its wheel kit and its folding handle can easily solve the issue of low mobility and allow for easy relocation of the device.

Features

Panel of the Honda EM4000SX

The EM4000SX's control panel

The generator allows for a quick, easy and convenient assessment of its gas level, as it is equipped with a built-in fuel gauge.

From a security point of view, the generator is equipped with an automatic low oil shut-off (Oil Alert®) and an overload protection (circuit breaker), giving you a peace of mind during use.

Along with the aforementioned features, from an accessory standpoint, the Honda EM4000SX's box includes the typical documentation and an owner's manual (opens in a new tab), which will help you start your generator promptly. An official storage cover is available, as a separate purchase.

iAVR Technology

Honda’s iAVR (opens in a new tab) (Intelligent Automatic Voltage Regulation) reduces voltage fluctuation by up to 50% over current AVR systems.

In conventional generators, when a load is applied, the engine’s rpm drops, which causes the voltage and frequency to drop as well, until the rpm recovers.

iAVR is a combination of the DAVR (opens in a new tab) technology and the iGX (opens in a new tab) engine technology, which serves to provide advanced and instantaneous engine rpm control when a load is applied.

As a result, voltage and frequency are precisely regulated and the EM4000SX is able to produce a starting wattage above the maximum rating, for up to 10 seconds. Therefore, thanks to iAVR, the EM4000SX is able to “overclock” itself above its 4000 starting watts and provide up to 5000 W.

Emissions

The Honda EM4000SX is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor and therefore, can be used in forested areas.

Product Videos

The Honda EM4000SX versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Honda EM4000SX compare to generators of similar power (between 3000 and 4000 W).

  • A weight of 204 lbs makes the Honda EM4000SX one of the heavier devices in the 3000-4000 rated wattage range. If weight is your top priority, one of the champions in this power category is the WEN GN400i, weighing just 66.1 pounds.
  • Since this generator is rated for a lowest possible noise of 61 dBA, it can be considered as one of the more quiet of the products generating similar power. If noise emissions are important to you, one of the least noisy generators of this power range is the Cat INV4000E with only 51 dBA.
  • Thanks to an impressive running time of around 16 hours at 50% load, the EM4000SX benefits from one of the highest run times among generators of a similar output
  • While the run time is an important parameter, it is dependent on the fuel tank’s capacity and thus, doesn’t say much on its own unless we consider fuel consumption as well. In fact, this generator is not among the most fuel efficient, within the aforementioned wattage range : its estimated gasoline consumption at 50% load is around 0.39 GPH. If not satisfied with the afore-mentioned fuel consumption, you may wish to check out the Westinghouse iGen4200. With a fuel consumption of as little as 0.17 GPH, it is one of the most efficient generators currently on the market.

Price comparison

As you can see from this interactive chart, when compared to other 3000-4000W generators, the Honda EM4000SX is on the expensive side of the price range.

While certainly not the cheapest of its kind, purchasing it would most likely also mean enjoying the reliability of a high-end product.

The bottom line

STRENGTHS:
  • GFCI Outlets
  • Remote start capable
  • iAVR technology
  • Quiet for its power (61 dBA)
  • High run time
WEAKNESSES:
  • On the expensive side
  • No data center
  • On the heavy side (204 lbs)
  • Low fuel efficiency

Do you own the Honda EM4000SX and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine270 cc Honda iGX270 OHV 4-stroke
Starting systemRecoil, Electric, Remote
Power
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts3500 W
Starting watts4000 W
Running amps (@120/240V)29.2/14.6 amps
Peaks amps (@120/240V)33.3/16.7 amps
Run time @50% load16 h
Run time @25% loadUnknown
Features
GFCI outletsYes
Covered outletsNo
Automatic Voltage RegulationiAVR
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120V 30A (L5-30R)
  • 1x 120/240V 20A (L14-20R)
DC outlets1x 12V 8A output
Data centerNo
IndicatorsNo
Fuel tank6.2 gal
Fuel gaugeYes
Misc
Weight204 lbs
Approx. dimensions (L x W x H)41.1 x 27.8 x 28.3 in
Noise (lower limit)61 dBA
THDUnknown
EmissionsCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedBattery and wheel kit
Warranty3 years
SeriesDeluxe
Other model numbersEM4000SXAT1

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About Honda

Founded in 1948, the Japanese Honda Motor Company has gained notoriety for consistently producing top quality engines, motor-powered vehicles and devices. Over the years, the company has gained a strong reputation in the motorcycle, automobile, but also power tool industry. Honda’s power tool division has been producing power tools since 1953, including tillers, mowers, blowers, sprayers and of course, power generators. While the company has expanded globally and moved a majority of its production out of Japan into other Asian countries, Honda is to this day known as a legend among the generator manufacturers.

Warranty Information

The Honda EM4000SX is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Honda generators, please consult Honda's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-770-497-6400.

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizing calculator.
ItemRunning WattsStarting Watts
At homeMicrowave (1000 watts)15001500
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Set of 5 LED light bulbs5555
Total2797 W3897 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric fry pan15001500
Radio100100
Total2790 W3380 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
What is the difference between the EM4000S, the EM4000SX and the EM4000SXAT1?

These model numbers refer to the same unit, but simply include more or less information regarding its specs, production batch, etc. Read how Honda name their generators.

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