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 buffs looking to enhance their experience
- DIYers who wish to improve their efficiency with tools
The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.
Power & Run Time
The Yamaha EF1000iS is powered by a 50 cc Yamaha MZ50 OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 900W as well as a peak wattage of 1000W.
At a noise rating of 47 dBA (less noisy than a library), the inverter generator is started via 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.
With a fuel capacity of 0.66 gallon, the EF1000iS may run for up to 11.9 hours with a full tank (fuel consumption around 0.06 GPH).
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 features the upcoming 2 AC outlets:
In addition, it provides 1 DC outlet: there's a 12V 8A receptacle allowing you to easily charge your batteries.
As the Yamaha EF1000iS is an inverter generator, its encased design (L17.7 x W9.4 x H14.9 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.
The EF1000iS is a lightweight, portable generator, as it only weighs 27.9 lbs. The generator can be moved with ease by only one person and so it can be enjoyed on-the-go. It can also be carried without effort with a featured handle (molded in the case), further improving its convenience.
Good to know: This unit ranks 5th in our list of the 10 smallest portable generators.
The light indicators show you if the oil level is too low, the generator is ready and the generator is on overload.
As far as security is concerned, the generator can be used with a peace of mind, as it features an automatic low oil shut-off (Oil Watch system) and an overload protection (circuit breaker).
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.
Accessory-wise, along with the previously mentioned features, the Yamaha EF1000iS is packaged with the standard documentation and an owner's manual (opens in a new tab), helping you start the device right away.
The Yamaha EF1000iS 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.
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 for its weight, the Yamaha EF1000iS weighs only 27.9 pounds, making it one of the lighter generators in the 500-1500 rated wattage category. If weight is your top priority, one of the champions in this power category is the Sportsman GEN1000i, weighing just 20.3 pounds.
- Since this inverter generator is rated for a lowest possible noise of 47 dBA, it can be considered as one of the more quiet of the products generating 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.
- The EF1000iS provides one of the highest run time among similarly powerful devices, reaching up to 11.9 hours at 25% load.
- The run time is important, but also hugely depends on the capacity of the fuel tank and doesn't mean much if we don't talk about fuel consumption as well. This inverter generator is one of the most fuel efficient models of the aforementioned output range, as its estimated fuel consumption reaches just 0.06 GPH (gallon per hour) at 25% load.
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||N/A|
|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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