Yamaha EF4500iSE Spec Review

The Yamaha EF4500iSE is a quiet inverter generator with a rated wattage of 4000 W and a starting wattage of 4500 W.

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Yamaha EF4500iSEYamaha EF4500iSEYamaha EF4500iSE

Description

MAXIMUM EFFICIENCY ‑ MINIMUM NOISE. The powerful engine allows this inverter to run at very low engine speed, reducing fuel consumption, noise, vibration and wear. (source: Yamaha (opens in a new tab))

Zoom on the Yamaha EF4500iSE

In summary, the Yamaha EF4500iSE is a quiet portable inverter generator especially useful for:

  • RV travellers who wish to upgrade their experience to another level
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

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 Yamaha EF4500iSE in use

The Yamaha EF4500iSE

The Yamaha EF4500iSE houses a 357 cc Yamaha MZ360 OHV 4-stroke engine, which provides 120V, consumes gasoline and delivers a running wattage of 4000W along with a peak wattage of 4500W.

At a noise rating of 58 dBA (less noisy than rainfall), the inverter generator is started via a convenient and easy-to-use electric starter (battery included).

This generator features Yamaha's Smart Throttle™. This load-sensing feature automatically adjusts engine speed to match its load in order to offer greater fuel efficiency and noise reduction.

Thanks to a fuel capacity of 4.5 gallons, the EF4500iSE can operate for up to 15.2 hours with a full tank (fuel consumption around 0.3 GPH).

The EF4500iSE generates a clean sine wave: providing <3% Total Harmonic Disruption (THD), delicate electronics can be plugged in its AC outlets safely.

Outlets

The control panel includes the following 3 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (L5-30R) receptacle

Even though this Yamaha generator isn't quite RV Ready, its L5-30R receptacle allows an easy RV connection via an L5-30P to TT-30R adaptor.

Portability

As the Yamaha EF4500iSE is an inverter generator, its encased design (L30.7 x W24.3 x H27.8 in) offers more aesthetics than a conventional, open frame product. This type of design is the most modern and convenient way to recreationally generate power.

As the generator's weight is 194 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 set of 4 wheels and its double handle can easily solve the issue of low mobility and allow for easy relocation of the device.

Features

Panel of the Yamaha EF4500iSE

The EF4500iSE's control panel

One of the many EF4500iSE's features is the data center, included in its control panel, which conveniently provides information on the lifetime run hours and power output and thus, helps you monitor its activity and status.

In addition to this info, when its oil levels are insufficient, the generator is overloaded and the generator is ready, you will be informed by the featured light indicators.

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

Security-wise, this product benefits from an overload protection (circuit breaker) and an automatic low oil shut-off (Oil Watch system), which gives you a complete peace of mind when using it.

Yamaha's Oil Watch warning system gives you an extra peace of mind. This feature enhances long-term durability by preventing engine damage and costly repairs. Once the oil begins to run low, the generator automatically shuts off and cannot be re-started until oil is added.

It also includes a carbon monoxide sensor. This sensor is designed to monitor the level of carbon monoxide present during the generator's operation. If the generator is positioned incorrectly and carbon monoxide levels rise to an unsafe level, the generator will automatically shut down. It’s a welcomed additional security feature, but don’t forget to always take your generator outside (opens in a new tab).

Accessory-wise, along with the previously mentioned features, the Yamaha EF4500iSE is packaged with the standard documentation and an owner's manual (opens in a new tab), helping you start the device right away.

Emissions

The Yamaha EF4500iSE 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, so it is adequate for use in forested areas.

Product Videos

The Yamaha EF4500iSE versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Yamaha EF4500iSE compare to generators of similar power (between 3500 and 4500 W).

  • As its dry weight is 194 pounds, the Yamaha EF4500iSE is one of the heavier of the products which can generate 3500 to 4500 running watts. If weight is your top priority, one of the champions in this power category is the WEN GN400i, weighing just 66.1 pounds.
  • At a lowest noise rating of 58 dBA, this inverter generator is one of the quieter devices of similar power. If noise emissions are important to you, one of the least noisy generators of this power range is the Cummins Onan P4500i with only 52 dBA.
  • Regarding its autonomy, the autonomy of the EF4500iSE, reaching up to 15.2 hours at a 25% load, can be considered as low end, compared to other products of a roughly equal output. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Champion 200954, reaching up to 22 hours.
  • Run times are important, yet thanks to their dependence on the fuel capacity, they should be judged along with the fuel consumption of the device. Compared to its peers, this inverter generator is not exactly fuel efficient, compared to similarly powerful devices, with an estimated fuel consumption of 0.3 GPH at a 25% load. 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 0.14 GPH, it is one of the most efficient generators currently on the market.

The bottom line

STRENGTHS:
  • CO Sensor
  • Electric start
  • Inverter
  • Quiet for its power (58 dBA)
WEAKNESSES:
  • No recoil back-up
  • No remote start
  • No parallel ports
  • On the heavy side (194 lbs)
  • Relatively low run time
  • Low fuel efficiency

Do you own the Yamaha EF4500iSE and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine357 cc Yamaha MZ360 OHV 4-stroke
Starting systemElectric
Power
VoltageAC: 120V 60 Hz
Running watts4000 W
Starting watts4500 W
Running amps33.3 amps
Peak amps37.5 amps
Run time @50% loadUnknown
Run time @25% load15.2 h
Features
GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
DC outletsNo
Data centerPower output and lifetime run hours
IndicatorsLow oil, overload and output ready
Fuel tankPlastic, 4.5 gal
Fuel gaugeYes
Misc
Weight194 lbs
Approx. dimensions (L x W x H)30.7 x 24.3 x 27.8 in
Noise (lower limit)58 dBA
THD< 3%
EmissionsCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralFloating
Accessories includedBattery
Warranty3 years

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 Yamaha

With a rich history of over 130 years, the Japanese based Yamaha Corporation, founded in 1887, has tipped its fingers in every industry imaginable, most notably motorcycles, musical instruments and electronics. The company boasts with a wide range of products, including many of the top rated portable generators. However, it has been reported that many of the newer models are made in China, rather than Japan.

Warranty Information

The Yamaha EF4500iSE 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 Yamaha generators, please consult Yamaha's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-800-962-7926.

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 homeRefrigerator (energy star)1921192
Hair dryer18001900
Vacuum cleaner10751175
Radio100100
Cell phone charger2020
Total3187 W4187 W
For campingRadiant heater13001300
RV refrigerator180600
Electric grill16501650
Set of 5 LED light bulbs5555
Total3185 W3605 W
For workGrinder14002500
Demolition hammer12601260
Electric fence (25 miles)250250
Drain cleaner250250
Total3160 W4260 W
Is it made in China? (Asked November 10, 2020)

The EF4500 is made in Japan.

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