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Honda EM4000SX (Discontinued)

The Honda EM4000SX is a portable open frame generator with a rated wattage of 3,500 W and a starting wattage of 4,000 W. (Read full specs)

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Honda EM4000SXHonda EM4000SX

This product was discontinued. For your convenience, we decided to leave this page up.
If you were looking to purchase it, you may want to have a look at the Honda EG4000CL, which has similar specs.
You can also try to find it second hand on eBay, by clicking on the button below.

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
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • Handcrafting enthusiasts who wish to work on-the-go
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Professionals who want to ensure that a power failure will not prevent them from working

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

Power & Run Time

The Honda EM4000SX in use

The Honda EM4000SX

Running on gasoline, the Honda EM4000SX utilizes a 270 cc Honda iGX270 OHV 4-stroke engine to deliver 120/240V, offering a running wattage of 3,500W and a starting wattage of 4,000W (and even up to 5,000 W thanks to the iAVR technology).

The generator is rated for a noise of 61 dBA (just slightly more noisy than background music). Its starting mechanisms include a standard recoil pull-rope starting mechanism and a straightforward and intuitive electric starter (battery included). Moreover, to offer you even more convenience, the EM4000SX can also be remotely started (separate purchase).

With its 6.2 gallons fuel tank, the EM4000SX can operate for around 16 hours at 50% load when fully fueled (with fuel usage averaging around 0.39 GPH).

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 providing easy battery charging capabilities.

This Honda generator isn't quite RV Ready, but it features an L5-30R receptacle, allowing a simple RV connection through an L5-30P to TT-30R adaptor.

Portability

With its L41.1 x W27.8 x H28.3 in dimensions, the open frame structure of the Honda EM4000SX guarantees stability, simplified maintenance access to components, and better air cooling than enclosed units. This type of design is ideal for tough environments and heavy outdoor use.

With a weight of 204 lbs, the generator is still labeled as 'portable,' denoting its ability to be moved, although its heaviness might restrict easy portability. However, its challenging mobility is solved by its wheel kit and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Honda EM4000SX

The EM4000SX's control panel

Thanks to its built-in fuel gauge, the generator allows you to quickly, conveniently, and easily check the gas level at a glance.

As far as security is concerned, the generator can be used with a peace of mind, as it features an overload protection (circuit breaker) and an automatic low oil shut-off (Oil Alert®).

Accessory-wise, along with the previously mentioned features, the Honda EM4000SX is packaged with the standard documentation and an owner's manual (opens in a new tab), helping you start the device right away. 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.

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).

  • At a dry weight of 204 pounds, the Honda EM4000SX is one of the heavier devices which can produce between 3000 and 4000 running watts. In terms of weight, one of the champions in their power range is the Pulsar PGD40iSCO, standing at just 46 lbs.
  • Rated at a lowest possible noise level of 61 dBA, this generator positions itself amongst the more quiet of the products of similar power. If noise is a concern for you, you could consider the Westinghouse iGen4500DF, which is one of the least noisy generators in its power range, rated at 52 dBA.
  • As the EM4000SX features an autonomy of around 16 hours at 50% load, it has one of the highest run times in comparison to the other generators of its power range.
  • Run time is a key metric, but it's dependent on the generator's fuel tank capacity. Therefore, discussing fuel efficiency is necessary for a complete understanding. This generator is somewhat less fuel-efficient than devices of comparable output: its estimated fuel consumption reaches 0.39 GPH at a 50% load. If minimizing fuel usage is one of your key priorities, the Pulsar PGD40iSCO is one of the most efficient devices with similar power output, with a gasoline consumption of only 0.22 gallons per hour.

The bottom line

STRENGTHS:
  • GFCI Outlets
  • Remote start capable
  • iAVR technology pushes starting watts up to 5,000
  • Quiet for its power (61 dBA)
  • High run time
WEAKNESSES:
  • 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
Parallel capableNo
RV readyNo
FuelGasoline
Engine270 cc Honda iGX270 OHV 4-stroke
Starting systemRecoil, Electric, Remote
Warranty3 years
Power
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts3,500 W
Starting watts4,000 W
Running amps (@120/240V)29.2/14.6 amps
Peak 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
ComplianceCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedBattery and wheel kit
SeriesDeluxe
Other model numbersEM4000SXAT1
UPC786102005265

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.

Spec Improvement×

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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 homeElectric fry pan15001500
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
Microwave (1000 watts)15001500
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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