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Yamaha EF1000iS Spec Review

Picture of the Yamaha EF1000iS

The Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator with a rated wattage of 900 W and a starting wattage of 1000 W.

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Yamaha EF1000iS 1

Description

SMALL BUT MIGHTY. Quiet, fuel efficient, and power clean enough to run sensitive electronic equipment all in a portable 28‑lb package. (source: Yamaha)

Zoom on the Yamaha EF1000iS

In a nutshell, the Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator mostly geared towards:

  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go
  • DIYers who wish to improve their efficiency with tools

In the following paragraphs, we shall explore the power characteristics, available outlets, portability and any additional features of the device, along with its emission compliance parameters.

Power & Run Time

The Yamaha EF1000iS houses a 50 cc Yamaha MZ50 OHV 4-stroke engine, which provides 120V, consumes gasoline and delivers a running wattage of 900W along with a peak wattage of 1000W.

Enjoying a noise rating of 47 dBA (less noisy than a library), this inverter generator gets running thanks to a simple traditional pull-start mechanism.

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.

The EF1000iS can operate for up to 11.9 hours with a full tank (fuel consumption around 0.06 GPH), due to its fuel capacity of 0.66 gallon.

The EF1000iS produces a clean sine wave: thanks to a <2.5% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.

The generator will allow you to simultaneously power various devices, for example:Note: All of these devices might not start simultaneously. Provided examples are based on a maximum load of 75 % and estimated wattages. With the help of our wattage calculator you can find out if this product suits your requirements.

Outlets

The control panel features the upcoming 2 AC outlets:

Duplex 120V 15A (5-15R)

Additionally, it features 1 DC outlet: there's a 12V 8A receptacle with which charging your batteries is made easy.

Portability

The Yamaha EF1000iS's characteristic encased inverter generator design (L17.7 x W9.4 x H14.9 in), provides an esthetical advantage over any ordinary, open frame product. This type of design is the most modern and convenient way to recreationally generate power.

Since the EF1000iS weighs only 27.9 lbs, it can be labeled as a portable lightweight generator. As it can be moved by a single person without much effort, the generator and its power can be enjoyed on-the-go. Further convenience is provided by a handle (molded in the case), as it allows you to carry it effortlessly.

Features

Several light indicators serve to show you when the generator is on overload, its oil levels are insufficient and the generator is ready.

Security-wise, this product benefits from an automatic low oil shut-off (Oil Watch system) and an overload protection (circuit breaker), 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.

Besides the features previously mentioned, accessory-wise, the Yamaha EF1000iS comes with the usual documentation and user manual needed to get you promptly started.

Emissions

The Yamaha EF1000iS 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, so it is adequate for use in forested areas.

Product Videos

Video of the Yamaha EF1000iS

Video of the Yamaha EF1000iS

The Yamaha EF1000iS versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Yamaha EF1000iS compare to generators of similar power (between 500 and 1500 W).

  • Weight-wise, the Yamaha EF1000iS has only 27.9 lbs, which renders it one of the lighter generators which produce 500 to 1500 rated watts. If you are concerned by weight, one of the champions in the above mentioned power range is the Sportsman GEN1000i, with a dry weight of just 20.3 pounds.
  • With a lowest possible noise of 47 dBA, this inverter generator places itself amongst the more quiet of the products delivering similar power. If noise emissions are important to you, one of the least noisy generators of this power range is the Honda EU1000i with only 42 dBA.
  • Thanks to an impressive running time of 11.9 hours at 25% load, the EF1000iS benefits from one of the highest run time of generators of a similar output.
  • 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. This inverter generator is one of the more fuel efficient models of the aforementioned output range, as its estimated fuel consumption reaches just 0.06 GPH (gallon per hour) at 25% load.
According to our stats, the following comparison is pretty popular: Yamaha EF1000iS vs Honda EU1000i.

Price comparison

As you can see from this dynamic chart, when compared to other 500-1500W generators, the Yamaha EF1000iS 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:
  • Inverter
  • Lightweight (27.9 lbs)
  • Quiet for its power (47 dBA)
  • High run time
  • Fuel efficient
WEAKNESSES:
  • On the expensive side
  • No data center
  • No electric start

Do you own the Yamaha EF1000iS and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Where to buy the Yamaha EF1000iS?

You can easily buy your Yamaha generator online. You will benefit from a convenient delivery and avoid carrying the heavy package yourself. Here are a few reliable online sellers:
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Price History
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Price history for the Yamaha EF1000iS
Latest updates:
  • $780.09 - September 17, 2019
  • $764.49 - September 16, 2019
  • $801.89 - August 21, 2019
  • $787.29 - August 20, 2019
  • $827.99 - August 14, 2019
  • $759.39 - July 27, 2019
  • $759.29 - July 26, 2019
  • $759.39 - July 23, 2019
Since: June 15, 2019
  • Highest Price: $901.59 - June 15, 2019
  • Lowest Price: $754.59 - July 22, 2019

Features and Specifications

General

InverterYes
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine50 cc Yamaha MZ50 OHV 4-stroke
Starting systemRecoil

Power

VoltageAC: 120V 60 Hz, DC: 12V
Running watts900 W
Starting watts1000 W
Running amps7.5 amps
Peaks amps8.3 amps
Run time @50% loadN/A
Run time @25% load11.9 h

Features

GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationNo
AC outlets1x Duplex 120V 15A (5-15R)
DC outlets1x 12V 8A
Data centerNo
IndicatorsLow oil, overload and output ready
Fuel tank0.66 gal
Fuel gaugeNo

Misc

Weight27.9 lbs
Dimensions (L x W x H)17.7 x 9.4 x 14.9 in
Noise (lower limit)47 dBA
THD< 2.5%
EmissionsCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedNo
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.

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 EF1000iS 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. Alternatively, you can also contact their Customer Support: 1-800-962-7926.

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