Yamaha EF1000iS



Choosing the best portable inverter generator is not so easy. You have to go through a lot to know about the inverter generators. We have made your work easy. After some research, we chose the Yamaha EF1000iS inverter generator. A detailed study on this generator will describe the generator and give an overall idea about the portable inverter generators. Read without skipping to know more about these generators.

Yamaha EF1000iS is a reliable generator from the house of Yamaha. In addition, buying these generators will not break the bank and is totally worth buying. Very importantly, the Yamaha EF1000iS is compact and weighs only about 30 pounds. But a full gasoline tank delivers a runtime of about 12 hours at applied quarter load. It offers an average output power of 900W and keeps emergency devices like mobile phones active during unexpected power cuts. The simple exterior look is the key attractional feature of this generator. It fits perfectly to rooms of any size and is suitable for indoor, outdoor activities.

Yamaha EF1000iS inverter generator -Product Overview

Yamaha EF1000iS is a good solution for charging essential devices at times of power shortage. With an output power of 900W, you can charge electrical appliances like mobile phones, laptops, and tablets to keep the communication active in emergencies.

Very importantly, the inverter technology employed in this generator ensures whether the sine wave is pure with the least THD (Total Harmonic Distortion). So, the produced power is safe for running sensitive devices like mobile phones. In addition, it can also run heavy ampere appliances like refrigerators, CFL bulbs, and one or two fans. Remember not to overload this compact generator as it might trip, and you need to start the generator manually. 

One of the main factors you focus on before buying a generator is the noise level. In Yamaha EF1000iS, the sound reduction technology will cut off the noise level to a low decibel rating of 47 dBA at rated quarter load. This generator uses glass wool for construction to absorb the noise and maintain the noise level low. In addition, the generator is lightweight and is easy to lift single-handedly. So, you can carry this generator for camping or short trips to charge your emergency devices like laptops, mobile phones, or tablets. The power outlets are sufficient to charge multiple devices in parallel. Overall, Yamaha EF1000iS hit all the marks and comes with a warranty of two years. Replacement and repair come under warranty coverage.


Specifications of Yamaha EF1000iS inverter generator

Manufacturer YAMAHA
Running watts and peak watts 900W and 1000W
Engine displacement 50cc
Engine type 4 OHV
Tank capacity 0.66 gallons
Runtime in hours at 25% load 12
Item weight in pounds  27.9
Noise level in decibels at full load 57 
Warranty in years 2


Highlights of Yamaha EF1000iS inverter generator

  1. A powerful 50cc four-stroke engine delivers a running watt of 900W and a starting watt of 1000W
  2. This generator is compact, lightweight, and efficient. So, it is easy to port anywhere
  3. A 0.66gallon fuel tank offers a runtime of 12 hours at applied quarter load
  4. It is ultra-quiet in operation, and the noise level is about 57 decibels at full load. 
  5. The inverter technology will produce clean energy with the least THD
  6. The power is stable and is safe to run delicate devices like mobile phones, PCs, and laptops
  7. It comes with a two-year warranty
  8. The power outlets like a 120V Duplex and a 12V DC is enough to charge emergency devices
  9. You can start the engine in an instant using a recoil system


 A detailed review of Yamaha EF1000iS inverter generator

A compact Yamaha EF1000iS delivers a maximum output power of 900W for running emergency devices. So, it is an excellent choice for homeowners as well as for contractors and car dwellers. Although this generator is not for running whole-house appliances, it helps in keeping the essential devices active to manage unexpected power cuts. 

It is extremely lightweight compared to other inverter generators in the market. Many customer reviews say that you will hardly notice the generator while carrying. With 27.9 pounds, you can put this on the backside of the car and start your trip. 

When it comes to performance, delivering output power from a compact generator is highly incredible. An impressive runtime of 12 hours at rated quarter load is enough to keep the essential devices like lights, fans, and heavy ampere appliances like refrigerators active during power cuts occurring at late nights. So, you don't have to wake up in the middle of the sleep to reduce the connected loads or refill the tank. On the whole, this generator is worth buying for its impressive features. 

Tank capacity and runtime

The compact tank holds up to 0.66gallons to provide a runtime of about 12 hours at an applied 25% load. Since this runtime exceeds your sleeping time, you will not find any disturbance during the whole night due to a power shortage.  Smart features like the eco-throttle mechanism will control the engine speed based on the laid connected to the unit. So, you can conserve fuel and extend the runtime. 

Performance and outlets 

Since the name is Yamaha, it is not a surprise to observe a stellar performance in the generator. This generator comes with an inbuilt 50cc powerful engine that delivers a running watt of 900W and a starting watt of 1000W. This average output is enough to run the emergency devices like mobile phones and tablets. 

Above all, the inverter technology in this generator will produce clean power without any voltage spikes. So, it is extremely safe to run sensitive electronic devices. This generator comes with power outlets like a 12V DC outlet and a 12V duplex for battery charging. 

Easy to use

Yamaha EF1000iS puts everything simple. So, it is easy to operate the generator since every outlet comes with proper labels. Although it uses a recoil system, it is easy to start the generator in an instant with one pull. Above that, there is an ON/OFF switch for controlling the engine operation. 

In addition, there is a smart eco-mode using which you can conserve fuel to a great extent. Very importantly, there is a LED light indicator that blinks in case of overloading. A simple alert can protect the engine from overloading danger.

Safety features

Though Yamaha EF1000iS is an entry-level model, there is no compromise in safety features. Like high-end models, this generator comes with safety features like an automatic low-oil shutoff system that stop the engine from running when low oil levels are detected. In addition, there is a low oil indicator light that alerts the user when the oil level is low. So, you can change the oil accordingly. 

Noise level

The best thing about this generator that we can confidently say is its noise level. At full load condition, EF1000iS produces a noise level of 57 decibels. A notable feature here is, you can bring a low decibel rating of 47 dBA by applying quarter load. In addition, this generator is constructed with glass wool to absorb noise. So, this generator is ideal for outdoor activities like camping, RVs, fishing, etc. With this quiet generator, you can continue a normal conversation with your neighbors without any disturbance. 


Just weighing below 30 pounds, the Yamaha EF1000iS generator is extremely lightweight and compact in size. A grippy surface makes the portability easier. With this minimum weight, the generator does not come with wheels, but there is an inbuilt sturdy handle for lifting the unit. This generator is space-saving and fits perfectly to your car boot or RV. As a whole, you will not find any disturbance while carrying this generator anywhere.

Warranty and Maintenance

Generally, inverter generators come with a year warranty. In the case of Yamaha EF1000iS, you don't have to think of any replacement for a couple of years. In addition, this generator comes with a three-year warranty for residential purposes. The warranty covers replacements and repairs. However, the generator must undergo proper maintenance to extend the life span of the engine. 

Yamaha EF1000iS Vs. Honda 1000i inverter generator

Honda and Yamaha are two big shots in the field of generators. Both manufacturers sell 1000W inverter generators equipped with basic features. Taking the weight into account, Yamaha EF1000iS is a pound less than Honda EU1000i. 

There is not much difference in the sound level. Both inverters operate at low noise levels. In Yamaha EF1000iS, you will hear a noise level of 47 dBA at quarter load. On the other hand, the Honda EU1000i operates at 52 dBA.  

The runtime in Yamaha EF1000iS is 12 hours at quartered load condition. In contrast, Honda EU1000i offers a runtime of 9 hours at the same load conditions. When fuel efficiency is taken into account, Yamaha is three times more efficient than Honda. In addition, the fuel tank in the Yamaha model is comparatively larger than Honda EU1000i. 


To summarize, Yamaha EF1000iS is a versatile portable inverter generator. An output of 900W will help you to charge your devices at times of emergency. It is a wise investment if you are looking for an entry-level model with basic features. For best deals, place your orders at eCommerce sites. 


Bestseller (lists)

Yamaha EF1000iS, 900 Running Watts/1000 Starting Watts, Gas Powered Portable Inverter Patio, Lawn & Garden

  • 1,000 Watt Maximum AC Output/900 Watt Rated AC Output
  • Noise Block Acoustically designed sound reduction system
  • Long Run Time - Runs continuously for up to 12 hours without refueling
  • Smart Throttle Load sensing throttle control
  • CARB Compliant
  • This item cannot be returned... Read More





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