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.
Zoom on the Honda EM4000SX
In summary, the Honda EM4000SX is a portable generator especially useful for:
- RV travellers wishing to enhance their freedom and nomad lifestyle
- People occasionally participating in sporting competitions, open-air performances and outdoor festivals
- DIYers who wish to improve their efficiency with tools
- Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
- Professionals who want to be able to deliver results, even during a power failure
Power & Run Time
The Honda EM4000SX is powered by a 270 cc Honda iGX270 OHV 4-stroke engine. It delivers 120/240V, runs on gasoline and offers a running wattage of 3500W as well as 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 an office), the generator features a simple traditional pull-start mechanism, but also a simple and elegant electric starter (battery included). For additional convenience, the EM4000SX may also be remotely started (separate purchase).
With a full tank, the EM4000SX can operate for around 16 hours at 50% load (fuel consumption around 0.39 GPH), thanks to its fuel capacity of 6.2 gallons.
The control panel features the upcoming 6 AC outlets:
Furthermore, it has 1 DC outlet: there's a 12V 8A output allowing you to easily charge your batteries.
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.
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. This type of design is ideal for tough environments and heavy outdoor use.
Since the generator weighs 204 lbs, it will be incredibly difficult to manually lift it and transport it, even though it is technically considered to 'be portable' (in the sense that it is movable). 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.
The generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.
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.
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.
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.
The Honda EM4000SX is EPA-approved and CARB-compliant. Therefore, its sale and purchase are permitted in all of the 50 states, including California.
Moreover, it features a spark arrestor, which makes it suitable for use in forested areas.
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. Regarding dry weight, one of the champions in the same power range is the WEN GN400i, with a dry weight of only 66.1 lbs.
- 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 you’d prefer a less noisy device, one of the most quiet devices, which share the same power range with this one, is the Cat INV4000E, whose lowest noise levels reach just 51 dBA.
- The EM4000SX provides one of the highest run time among similarly powerful devices, reaching around 16 hours at 50% load.
- 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. This generator is rather wasteful, compared to other devices within the aforementioned output range, when it comes to gasoline consumption, as it reaches roughly 0.39 GPH at a 50% load. If fuel consumption is your top priority, we suggest to check out the Westinghouse iGen4200, which has a fuel consumption of only 0.17 GPH and thus, is one of the most efficient devices in our database.
The bottom line
- GFCI Outlets
- Remote start capable
- iAVR technology
- Quiet for its power (61 dBA)
- High run time
- No data center
- On the heavy side (204 lbs)
- Low fuel efficiency
Features and Specifications
|Engine||270 cc Honda iGX270 OHV 4-stroke|
|Starting system||Recoil, Electric, Remote|
|Voltage||AC: 120/240V 60 Hz, DC: 12V|
|Running watts||3500 W|
|Starting watts||4000 W|
|Running amps (@120/240V)||29.2/14.6 amps|
|Peak amps (@120/240V)||33.3/16.7 amps|
|Run time @50% load||16 h|
|Run time @25% load||Unknown|
|Automatic Voltage Regulation||iAVR|
|AC outlets|| |
|DC outlets||1x 12V 8A output|
|Fuel tank||6.2 gal|
|Approx. dimensions (L x W x H)||41.1 x 27.8 x 28.3 in|
|Noise (lower limit)||61 dBA|
|Security||Low oil and overload protection|
|Accessories included||Battery and wheel kit|
|Other model numbers||EM4000SXAT1|
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.
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.
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?
|Item||Running Watts||Starting Watts|
|At home||Sump pump (1/2 hp)||1050||2150|
|Furnace fan (1/2 hp)||875||2350|
|Refrigerator (energy star)||192||1192|
|Total||2517 W||3992 W|
|For camping||Radiant heater||1300||1300|
|RV AC (11,000 BTU)||1010||1600|
|Total||2760 W||3350 W|
|Total||2740 W||3840 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.
Couldn't find the right answer for you? Ask your own question.