Oct 14, 2022

Yamaha EF2000iS 2000 Watt Inverter Generator Review – Try It In 2020!

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9.8Editor's Score

Lean, compact and powerful, the Yamaha EF2000iSv2 Portable Inverter Generator is a great choice for individuals looking for a reliable power backup. The unit effectively delivers a peak power output of 2000 watts, which comes in handy when powering a wider range of electrical applications. Besides, it is light enough to tote along to the beach, a campsite or any recreational site.

  • Powerful – Maximum AC Power Output of 2000 Watts
  • Energy Efficient – It has an economy mode switch for higher fuel efficiency
  • Durable – Compact construction for enhanced durability


The technology behind inverter generators is relatively new. It, therefore, does not come as a surprise that most users tend to get confused when it comes to discerning the functionality of these power units. It is so easy for anyone to mistake inverter generators for conventional standalone generators, simply because they look alike. However, sharp differences exist between these two models. Inverter generators are smaller, quieter, powerful, and more efficient compared to traditional standalone generators. With all these benefits to savor, acquiring an inverter generator is your surest means of having a steady supply of power wherever you are. However, with so many brands and models available in the market today, choosing the right unit can be quite a challenge. This Yamaha EF2000iS 2000 Watt Inverter Generator Review highlights one of the best inverter generators worth checking out.



Do you reside in an area that experiences frequent blackouts? Worry no more! With the Yamaha EF2000is 2000 Watt Inverter Generator, you can say goodbye to all your power problems.

This inverter generator features a 1600 Watt rated engine that can actually deliver a maximum AC output of 2000 Watts. With the smart throttle control, the unit automatically adjusts engine speed based on load, allowing for economical fuel consumption and reduced noise.

With a fuel tank capacity of only 1.1 gallons, the generator can run for up to 11 hours without compromising on the quality of power. Additionally, the parallel capability feature enables you to connect the unit with compatible generators for extra power when handling heavy loads.

We know that noise can be a huge concern when dealing with generators. However, this is not the case when it comes to the Yamaha EF2000is. The generator is fitted with a technologically sophisticated muffler with a USFS spark arrestor that significantly reduces noise to 51.5 decibels!

Yamaha EF2000iSv2

  • Pulse Width Modulation (PWM) control that produces pure sine waves for high-quality power
  • Electrical Overload Breaker that automatically shutdowns the generator in case of overload preventing damage
  • Twin Tech capability that allows parallel connections to up to 2 generators for maximum power output
  • Features centralized controls for easy access
  • Auto-decompression system for easier starts
  • Fuel petcock that prevents gumming and stale gas problems
  • Oil Watch warning system that prevents damage to the engine due to low oil levels
  • EPA and CARB compliant
  • Compact design for easy storage and transportation
  • Three year limited warranty

The Design

Yamaha EF2000iSv2The Yamaha EF2000is comes in a compact design that makes it easy to store, connect and transport. Weighing only 44.1 pounds this generator is extremely lightweight and highly portable.

It also features a comfortable grip handle that offers maximum control. As if that is not enough, all controls are centralized for easy access.

This generator is designed to reduce noise levels that are normally associated with conventional generators. It features a smart throttle control that regulates engine speed, significantly reducing the noise.

It also comes with rubber vibration isolation feet similar to those in quiet air compressors that absorb sound, so you will enjoy stress-free environment during your work or leisure time.

If you want something fancy the manufacturer offers a camo version for the customers, but it’s a bit pricier.


Power and Performance

The Yamaha EF2000 is rated at 1600 Watts, but can deliver a maximum AC power output of up to 2000 Watts. This is made possible by its parallel capability that allows you to connect up to two generators delivering up to 30 amps.

The performance of this unit is highly superior as it can run for up to 11 hours without wavering. The Pulse Width Control delivers pure sine waves, leading to high-quality power.

Pro Tip

It is recommended that you run your inverter generator after every few days for at least half an hour to maintain the charge of the electric starter and keep the engine in top shape.


Safety Features

Yamaha EF2000iSv2The Yamaha EF2000is comes with several safety features that prevent damage to the generator and offer extra protection to users and making it easy to maintain.

One notable setting is the oil watch warning system that ensures that the oil level does not run low. This prevents engine damage caused by low oil levels.

You can establish the level of fuel left using the fuel gauge that comes with this unit.

The OHV engine with cast iron cylinder liner offers exceptional heat dissipation preventing possible burns or scalds.


  • Quiet operation
  • Parallel capability
  • Lightweight design
  • High fuel efficiency
  • High-quality power output
  • Long run time
  • Centralized control unit for easy access

  • Does not have a gas or oil drain plug
  • A little bit pricey


Things we liked about it

Generators, particularly the older models can be extremely noisy during operation. However, this is not the case with the Yamaha EF2000. It comes with a super-quiet muffler designed for quiet operation. It also consists of a noise block sound reduction system that limits noise levels to as low as 51.5 dBA. This makes it one of the quietest inverter generators available in the market today. Another notable feature that we liked is its high fuel efficiency. The smart throttle control varies the speed of the engine based on the load applied, allowing for greater fuel efficiency. With a fuel tank capacity of 1.1 gallons, this generator delivers a steady supply of power for up to 11 hours for ¼ rated loads. Although higher loads might require more fuel, the generator consists of an economy control switch that automatically adjusts the engine speed according to the load, ensuring that only a minimal amount of fuel is consumed during operation.

Things we didn’t like

Apparently, this generator does not have a gas drain and an oil plug. You have to tip it over to drain extra oil or siphon out stale gas manually before refueling. Siphoning out gas is not only inconvenient, but also a safety hazard.  Although these design shortcomings might not be major concerns to most users, we think that Yamaha should have incorporated a gas drain and an oil plug on this model for extra convenience and safety purposes.


General User Experience

Yamaha EF2000iSv2Customer impressions about this inverter generator are overwhelmingly positive. Nearly 90% of verified customers on Amazon rate this unit highly. The high ratings simply mean that the Yamaha EF2000 exceeds expectations with its superior performance and cutting-edge features.

It would be great if Yamaha reconsidered the pricing of this model. However, with all the great features that come with this unit, it is clear to see that it offers good value for money.

Furthermore, with a three-year warranty coupled with three years of free workmanship, most consumers seem happy with what this inverter generator has to offer despite the hefty price tag.

Yamaha EF2000iSv2 Generator Inverter


How much gasoline should I stock for this generator?

This generator comes with a fuel tank capacity of 1.1 gallons that is enough to run for approximately 11 hours on ¼ rated appliances. However, heavier loads might require more fuel, thus it is recommended that you stock at least 4-6 gallons of fuel.

Can I parallel the new Yamaha EF2000isV2 with the older model EF2000is?

Yes. One of the most attractive aspects about Yamaha inverter generators is their parallel capability. It comes with a new controller board that allows you to connect two generators seamlessly for the extra power of up to 30 amps. You can use this parallel combination to run heavier loads such as air conditioners and refrigerators.

What home appliances can I power with this inverter generator?

The Yamaha EF2000is generator consists of a Pulse Width Modulation control that produces pure sine waves ideal for microcomputer-controlled electric applications and home appliances with low wattage. It can be used for lighting, powering speakers and charging phones.


Whether you want a reliable power backup for your home or you need a generator for your next camping trip, then the Yamaha EF2000is 2000 Watt Inverter Generator is exactly what you need for all your emergency power needs. It can run for up to 11 hours delivering high-quality power output using very little fuel.

Unlike traditional generators, the Yamaha EF2000 produces very little noise during operation making it ideal for use anywhere, including noise-sensitive areas. With so many auxiliary features to talk about, this unit offers good value for money. We highly recommend the Yamaha EF2000is to homeowners in need of power backup options.


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