Zoom on the Yamaha EF1000iS
In summary, the Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator especially useful for:
- Camping and tailgating hobbyists looking for a portable power source
- DIYers who wish to improve their efficiency with tools
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 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.
With a noise rating of 47 dBA (less noisy than bird calls), the inverter generator features 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 generates a clean sine wave: providing <2.5% Total Harmonic Disruption (THD), delicate electronics can be plugged in its AC outlets safely.
The control panel provides the upcoming 2 AC outlets:
It also sports 1 DC outlet: there's a 12V 8A receptacle with which charging your batteries is made easy.
Since the Yamaha EF1000iS is an inverter generator, its closed design (L17.7 x W9.4 x H14.9 in) has an esthetical advantage over conventional, open frame devices. This type of design is the most modern and convenient way to recreationally generate power.
With a weight of only 27.9 lbs, the EF1000iS may be viewed as a lightweight and portable generator. As it can be moved by a single person without much effort, the generator and its power can be enjoyed on-the-go. This convenience is further enhanced thanks to its handle (molded in the case) that allows you to carry it with ease.
Good to know: This unit ranks 5th in our list of the 10 smallest portable generators.
When the oil level is too low, the generator is on overload and the generator is ready, you will be informed by the featured light indicators.
From a security standpoint, the product offers an overload protection (circuit breaker) and an automatic low oil shut-off (Oil Watch system), allowing you to use it with a peace of mind.
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.
Regarding its accessories, besides the aforementioned features, the Yamaha EF1000iS's box includes the typical documentation and an owner's manual (opens in a new tab), letting you start it right off the bat.
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, making it usable in forested areas.
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).
- As far as its dry weight is concerned, the Yamaha EF1000iS weighs just 27.9 pounds and thus, it is one of the lighter 500 to 1500 rated wattage generators. In terms of weight, one of the champions in their power range is the Sportsman GEN1000i, standing at just 20.3 lbs.
- 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 one of your priorities, you may be interested in the Honda EU1000i, one of the least noisy generators similarly powerful as this one, rated for 42 dBA.
- As the EF1000iS features an autonomy of up to 11.9 hours at 25% load, it has one of the highest run times in comparison to the other generators of its power range.
- 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. At an estimated fuel consumption of 0.06 GPH (gallon per hour) at 25% load, this inverter generator is one of the most fuel efficient units within its wattage category.
As you can see from this interactive 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
- Lightweight (27.9 lbs)
- Quiet for its power (47 dBA)
- High run time
- Fuel efficient
- On the expensive side
- No data center
- No electric start
- No parallel ports
Features and Specifications
|Engine||50 cc Yamaha MZ50 OHV 4-stroke|
|Voltage||AC: 120V 60 Hz, DC: 12V|
|Running watts||900 W|
|Starting watts||1000 W|
|Running amps||7.5 amps|
|Peaks amps||8.3 amps|
|Run time @50% load||Unknown|
|Run time @25% load||11.9 h|
|Automatic Voltage Regulation||Inverter|
|AC outlets||1x Duplex 120V 15A (5-15R)|
|DC outlets||1x 12V 8A receptacle|
|Indicators||Low oil, overload and output ready|
|Fuel tank||0.66 gal|
|Approx. dimensions (L x W x H)||17.7 x 9.4 x 14.9 in|
|Noise (lower limit)||47 dBA|
|Security||Low oil and overload protection|
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.
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.
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 (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-800-962-7926.
Questions & Answers
What can it power?
|Item||Running Watts||Starting Watts|
|At home||Rice cooker||650||650|
|Set of 5 LED light bulbs||55||55|
|Total||705 W||705 W|
|For camping||RV refrigerator||180||600|
|Pair of small speakers||45||45|
|Total||575 W||995 W|
|For work||Paint sprayer||600||600|
|Total||680 W||680 W|
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