2024 Update – Yamaha EF2400iSHC Inverter Generator vs New Models

The Yamaha EF2400iSHC is still a great inverter generator but it’s been discontinued. You might find it online but I think you have better options in 2023/23. In fact, Yamaha has essentially negated the EF2400iSHC with their newer 2200W YAMAHA EF2200iS. You can read our full review of the EF2200iS in our dedicated article on it. The original review of the EF2400iSHC is still included in this article, as well as reviews of other older Yamaha models.

The Falling Price of Inverter Generators

What you will find here is an extra section at the beginning of this article with a few alternative options instead of the EF2400iSHC. The inverter generator market has changed a lot in the past few years so it’s important to know what your options are.

The Yamaha EF2400iSHC was an expensive inverter generator, engineered to tackle a wide variety of applications with ease. It’s built to last, extremely reliable, durable and operates in a whisper-quiet manner (53 to 60 dB) — quieter than a normal conversation. Yamaha has always made excellent generators, alongside Honda but the one thing that has changed over the years is price.

A lot more companies are making inverter generators today and this has driven down the price of inverter generators. This is great news for consumers. Before you had to wealthy to afford a Yamaha or Honda inverter generator but today you can buy an equally as good model from a different brand. You no longer have to settle for quality but it will cost you a lot less.

Times Have Changed

I am updating this article as when it was originally written the Yamaha EF24000iSHC was one of the very best inverter generators you could buy but in 2024 (Dec 10) there are much better options and for much less money. This Yamaha has also been discontinued so it’s become obsolete. You might still be able to buy it online but you’ll be better off buying a newer inverter generator.

I intend to leave the original article intact. You can read it below or simply SKIP DIRECTLY TO IT. The information is valuable for anyone looking for detailed information on several older Yamaha generators. Some of the models are still available, but what I am doing is adding my recommendations for inverter generators that are similar to the EF2400iSHC.

These next two options are excellent alternative to the 2400W Yamaha. Generac is another top brand in generators. The IQ3500 is ultra-quiet. You can barely hear it when it’s running. The large sound-proof case does an excellent job at absorbing sound. The only complaint I have is that it does not come with wheels. Luckily you can buy a wheel kit for it, which I recommend. In fact, don’t buy the generator without the wheel kit. It weighs over 100 pounds.

The final recommendation is a portable power station from Jackery. It’s a battery generator which can be recharged from solar panels in 2.5 hours and 2 hours via your wall outlet. Battery generators are absolutely silent, can be used indoors, and don’t require maintenance. If you can afford the extra cost I recommend buying portable power station. They’re superior in every way, and yes, they produce pure sine wave power. This is the future of generators.

For more information on the Jackery, read our review of the 1000 PRO and 2000 Explorer PRO. Technology has evolved for battery generators (also known as indoor generators) and the range of products is increasing, with more powerful models becoming more common. Take a look at the ECOFLOW brand for the most advanced power stations on the market — in my humble opinion. It’s amazing what they’re doing with solar generator systems.

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Yamaha EF24000iSHC — Original Article

For reference, some of the inverter generators we find in this article are: Yamaha EF2000iSv2 (DISCONTINUED), Yamaha EF3000iSEB (3500W) and the Yamaha EF1000iS (DISCONTINUED). It’s important to be aware of other options because sometimes what you think you need is not what you truly need.

Let’s begin…

What are your needs? Do you need a generator for work? Camping? Emergency backup? Boating? The wonderful thing about the Yamaha EF2400iSHC is that it’s compact, lightweight (75 lbs.) and highly efficient thanks to practical features like its smart throttle.

Yamaha knows how to build exceptional generators, and the EF2400iSHC fits that description. We dig deep and tell you everything you need to know about it, but we also give you a crash course in understanding generators and what to consider before making your buying decision.

What are your needs? Do you need a generator for a work site? Camping? Emergency backup? Boating? The wonderful thing about the Yamaha EF2400iSHC is that it’s compact, lightweight (75 lbs.) and highly efficient. Yamaha knows how to build exceptional generators, and the EF2400iSHC fits that description.  We dig deep and tell you everything you need to know about it, but we also give you a crash course in understanding generators and what to consider before making your buying decision.

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Yamaha EF2400iSHC –  Everything You Need to Know

Watch the video below to get an overview Yamaha EF2400iSHC.

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First, before we discuss the EF2400iSHC in detail — here’s a list of features:

• Pulse Width Modulation — Ultra clean power. As clean as or cleaner than commercial power.
• Intelligent Throttle — Will modulate engine speed to match the load in real-time.
• Oil Watch Warning system — Automatically shuts of generator if it senses low oil.
• Portable, compact and lightweight — Weighs 75 lbs.
• 2400 starting watts / 2000w running watts.
• Engine speed at full load (2400 watts) is only 3400 rpm; quiet and efficient.
• Cast iron cylinder liner will increase engine longevity.
• Removable back access panel makes it easy to service and/or maintain/repair.
• Fuel gauge allows you to quickly and easily see how much fuel remains.
• Aluminum die cast frame is strong and lightweight.
• Gasoline petcock lets you shut off the gas to run the carburetor dry for storage.
• 12 volt DC cable is included with your purchase. Easily charge your : RV, ATV, motorcycle, marine, and car batteries.
• EPA & CARB Emission approved. Clean running generator for a better environment.
• Can be sold in all 50 states.
• Warranty covers the complete generator for any defects and parts, including workmanship for three 3 years.

✓ Documents — Yamaha EF2400iSHC

• View or download the MANUAL.
• View or download the SPECS & FEATURES.

The Yamaha EF2400iSHC is an incredibly compact and power-packed inverter generator which is capable of powering multiple small home appliances simultaneously, and can even handle the rooftop AC on top of your RV. However, its biggest strength is of course the fact that it manages to pump out 2400 watts of clean AC power while maintaining a noise level of less than 60 decibels.

Yamaha is a well-known generator manufacturer alongside Honda and other big names, but their EF2000i series of inverter generators is especially popular because of the aggressive pricing (they cost less than most medium sized inverter generators), silent operation, and compact size.

Compact and Portable

✓ Note: Will run most 13,500 btu RV air conditioners, microwave/convection ovens, or even the biggest hair blow dryer.

So why would you need one of these? Well, if you happen to engage in family camping, outdoor trips, and picnics, then you definitely need a power generator to supply electricity to all your appliances such as portable barbecue, toaster, coffee maker, portable TV, laptop, etc. For people who own an RV and tend to go on long trips with it, an AC power generator can prove to be an indispensable asset due to its versatility and compact size. You can power the microwave, TV, AC, pump, and more inside your RV with the help of an inverter generator.

And the usefulness of these wonderful machines doesn’t end there. In case of a power outage due to some unforeseen natural calamity such as a storm, flood, etc. your family will be able to sustain themselves until communications and basic utilities come online, which could take anywhere between a couple of days to a week, even more. If you intend to set up some sort of storm shelter or bunker in the basement of your house, then a generator is always the first thing you want to put in there.

After that you can start piling food, tools, and other survival gear — but NEVER RUN A GENERATOR IN CLOSED SPACES. The carbon monoxide will kill you. More on that later.

There are many more uses for a compact generator, and listing all of them over here will simply take up too much time and space. However you probably get the picture by now, and even if you are not a person who engages in camping, fishing, picnics, etc. a generator is still an invaluable asset for you.

Diagram of Major Components | Yamaha EF2400iSHC

Natural calamities and power grid failures are not going to send you a memo before they arrive. Trust me on this one. it’s better to be safe than sorry when preparing for natural disasters. If you stay in an area that is especially prone to storms, floods, etc. then a generator is definitely a must-buy for your home, unless you plan on going full caveman after disaster strikes.

Good luck trying to find a generator after a natural event knocks out the power in your home. You won’t be the only one heading down to the local Home Depot to find a portable generator. And in extreme situations like an an earthquake, you’re unlikely to be able to even travel because roads will be blocked and the city will essentially shut down. I’m not trying to scare you, but you need to honestly assess the likelihood of such events based on your geography and the history of your city or town.

Portable enough to be used wherever you need power

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Inverter Generator vs Conventional Generator

Normally, when you begin an online search for “generators”, you will be flooded with a wave of products that seem similar to each other at first glance, but when you roll your eyes down and take a look at the price, you get a nasty surprise. You might ask yourself: “If both of these are 2000W generators, why does one cost 50% more than the other?”

Well, we don’t blame you for thinking like that, because company nomenclatures and product pricing can get extremely confusing at times. Unless you know how a generator works or about the different types of generators out there, you’ll be left scratching your head and unsure what to buy for your home.

Here is the deal- If you plan on powering machines that are not very sensitive to power such as lights, fans, heaters, irons, pumps, etc. then you will do fine with a regular generator. But if you want to power sensitive appliances such as computers, portable microwave ovens, and compact toasters, then you need to get an inverter generator in order to ensure optimal performance, as well as a longer lifetime for your machines.

Video | Conventional Generator vs  Inverter Generator

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How do Generators Work?

Well, generators are basically a means to convert one form of energy to another. They take the fuel in the gas tank and use it to power an internal combustion engine which is normally a 2 stroke single-cylinder engine (for the most basic models). Better and costlier models will usually have a costlier 4-stroke engine that is both quieter as well as more efficient.

This engine is attached via a flywheel to an alternator which converts the mechanical rotations into electrical power (AC current) by using the principle of electrical induction. Normally, the engines of a conventional AC generator rotate at around 3000 rpm, and basic models are incapable of altering their engine speeds irrespective of the load on the receiving end. When the engine spins faster, the generator pumps out more power, and when it spins slowly, the power output is reduced.

So why does all of this matter? Well you see, a conventional generator does not output the “cleanest” of AC currents. AC current or alternating current is basically an artificially generated form of electric current which flows in the form of alternate power cycles, as opposed to DC current (direct current) which is always stable. Conventional generators output square or block wave current, while the wall outlets in our homes output pure sine wave current. Most appliances these days are designed to operate on sinusoidal (sine) wave current, and even though they will work on square wave AC current, they will not run as efficiently.

Watch this Video | How Does A Generator Work?

For example, if you supply square wave current to a brushless motor it will run hotter and louder than usual. If you supply square wave current to a computer, it will not run as efficiently as it should and the circuits could get damaged over the long run, especially the sensitive silicon chips inside such as the CPU, RAM, Graphics Card, etc. However, inverter generators specialize in delivering pure, clean sinusoidal AC current that is similar to the current that you get from your power company via the socket in the wall.

So why do people still use conventional generators if their AC output is not as “clean” or “pure” as that of inverter generators? The short answer to that would be “because they are cheaper and easier to service/maintain”.

But, if you wish to know the true strengths and weaknesses of each generator type, we have listed them below.

— Power Output

When it comes to power output, things tend to vary quite a bit depending on the specific model and pricing. However, conventional generators are capable of delivering anywhere between 800 to 40,000 watts of power, while your average inverter generator will be restricted to a maximum power output of nearly 4000 watts. But hey, don’t jump ship just yet. With 4000 watts of power, you will be able to run the rooftop AC in your RV, while roasting a chicken in the microwave and watching TV. So yeah, you don’t need more than 4000W unless you plan on running some of local power delivery service from the backyard for your neighbors.

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Think about it, even if you don’t own a RV and plan to use the inverter generator at home in case of a power grid failure or some sort natural calamity, 3000-4000 watts should be all you need. You can power nearly 4 fans, 8-10 LED/CFL lights, a TV, a microwave, a water heater, and a laptop with all that power; and you’ll still have some headroom for additional appliances such as a blender, toaster, etc.

So even though conventional generators are capable of generating more maximum power per dollar (judging from price of the actual generator itself, not efficiency or running costs), you don’t necessarily need any more power than a high end inverter generators have to offer. But, it’s important to determine the correct size for you.

Printable Generator Sizing Worksheet

— Fuel Capacity

If you have researched commercial or home grade generators online, then you have probably noticed that the inverter generators are smaller and lighter than their conventional counterparts. However, this extra portability comes at a cost. Due to their petite size, inverter generators are outfitted with smaller fuel tanks, whose capacity typically ranges between 1 to 2 gallons. However, that was just the fuel capacity. But do we care about who boasts a larger belly? No, we care about how much electricity we can get out of that fuel. And that is where the fight equalizes between the two, with a slight advantage for the inverter generator.

It is true that inverter generators pack slightly smaller fuel tanks. However, all of them come with extremely efficient microprocessor-assisted 4-stroke engines. These engines have been loaded with all sorts of efficiency optimizations from the spark plug to the exhaust. Which is why, they deliver more power per drop of fuel in comparison to the older 2-stroke engines used in conventional generators.

Another important point to be aware of is; conventional generators are incapable of decreasing their engine speed based on the load at the other end. A 4000 watt conventional generator will run its engine at the rated maximum of 3600 rpm regardless of what appliance is connected on the receiving end. It doesn’t care if you connect a power drill + microwave combo, or a 40 watt bulb, the engine will keep drinking fuel at the same rate.

As wonderful as inverter generators are due to their efficiency, clean power and quiet operation, they can’t compete with conventional gas generators when it comes to raw power. So, if your power needs are relatively small then an inverter generator is a great choice. Just be aware that an inverter generator won’t solve all of your power needs.

So with a conventional generator, you’re literally throwing away precious fuel whenever you are not using at least 70% of the power that it is rated at.

Well then, what about the inverter generator? It features an intelligent load monitoring system that constantly keeps checking the load being put on the output, so the microprocessor can instruct the engine to increase or decrease its speed in order to conserve fuel, just like your smartphone or laptop goes into power saving mode whenever it is not being used to do heavy tasks. As you’ll see soon, this feature translates into more than just increased fuel efficiency. So, basically what this does is increase the amount of power that you get per unit of fuel. Meaning that, even with a smaller tank, an inverter generator can match the total running time of a much larger conventional generator.

— Noise and Efficiency

Remember the whole smart speed control thing that we talked about? Well if you think about it, the benefits are far more than just decreased fuel consumption. What it also means is that your generator will become much quieter when you are using it to power something that is not very power hungry, such as a laptop, miniature toaster, or even a compact microwave oven (600 watts).

In terms of efficiency, an inverter generator is the clear winner among the two because of its superior engine design, intelligent load monitoring, and microprocessor assisted operation. Not to mention the lower emissions, they greatly reduce the environmental footprint of an inverter generator in comparison to a conventional generator.

— Portability

Yet another clear win for the inverter generator. Even small sized conventional generators are bound to be larger than inverter generators due to their clunky engine designs and large fuel tanks. If you tend to travel a lot, or if you need a generator for camping and picnics, then an inverter generator is definitely the way to go. Most of them weigh around the 50-pound mark (dry weight), and are smaller than a 20” square box. They also include ergonomic carry handles on the top, so you can pick them up and move them around, just like a suitcase.

— Price

This is the only area in which the conventional generator scores a clear victory over its newer, quieter, and more efficient counterpart. No matter how hard you try, you’ll not be able to find an inverter generator that is priced equal to, or less than a conventional generator of similar power rating. It requires research and custom built parts to reduce size, noise, emissions, etc. while still maintaining performance. If you don’t need clean AC power and your appliance is capable of running off a square/block wave AC current, then a conventional generator will do just fine.

Here are some other scenarios where you might want to get a conventional generator instead of an inverter generator.

1. You have an appliance that is not very sensitive to current quality, and needs to run continuously for like at least 15-16 hours a day.
2. You don’t really care about heat output, noise, etc. because the generator is going to be located at a large distance from your home or room.
3. You’re on a budget and need something cheap for your lights, fans, heaters, etc. (All of these are not very sensitive to current quality).

It’s important that you consider all factors when making your buying decision. If you wish to know how the inverter generator functions, and how it generates clean AC power, read on below…

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How do Inverter Generators Work?

Watch this informative video from Champion Power Equipment. Another great manufacturer of generators.

https://www.youtube.com/watch?v=ZcxCEQ0KWHE

Okay, nothing too complex here. An inverter generator gets its name from the fact that it combines an inverter and generator into one machine. But why would you need to do something like that? What is wrong with using just the generator alone? Good you asked, because there is quite a huge difference between the regular generator and an inverter generator in terms of output power quality.

If you didn’t pay attention during your college classes or if you are not familiar with electricity and its types in general, you must be thinking “Wait, there are types of AC current? Shouldn’t I just be concerned with voltage and amperage?” Well, you electrical appliances run on alternating current which is generated artificially. Direct current is the current that is obtained from batteries, and is a natural form of electricity that is also found in the bodies of animals (nervous system). It is basically known as constant current.

✓ For the latest options on inverter generators worth buying then have a look at these articles that are up to date:

• Top Rated Inverter Generators : Full Buying Guide
• 4500W Inverter Generators: Westinghouse iGen4500
• Inverter Generator vs Traditional Generators: What’s the Difference?
• Honda 2200W Inverter Generator: vs Other 2200W Models

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How inverter generators work, continued…

If you were to draw a graph of a 5V DC current signal, it would be a straight line with a value of 5 on the volts axis, continuing until you shut the switch. However this is how AC works — A 5V AC current signal begins it life at a value of 0V, and rises till 5V. It then crashes down to zero and goes to negative 5V, (switching polarity or current direction) and rises to zero volts again.

AC signals are what our appliances use, and this is what comes out when you generate electricity from a generator or at the power plant via electrical induction. Your home supply gives you a 120V (USA, 240V elsewhere), 60 Hz current via the wall outlets.

Okay, but why does any of that matter? Here’s why- your light bulb may not care if it receives a square or sinusoidal AC current, but the microprocessor in your laptop or desktop thinks this stuff is really important. In fact, the power supply unit in your computer is especially designed to provide pure sine wave AC current to the sensitive silicon chips inside, which are really particular about the type of current that they are fed (and have operating voltages of less than 1-3 volts). Remember how alternating current rises and falls between positive and negative cycles? Well, that change is much more abrupt with a square wave, than it is with a sine wave.

Pure Sine Wave (Inverter) vs Modified Sine Wave (Conventional)

In a square wave or block wave, the current and voltage crashes and rises immediately, while a sine wave is curved and more gradual. All modern appliances today are designed to perform at their peak only with sinusoidal AC current. They will work with any AC current, but they will run hotter and at lower efficiency. Some ultra-sensitive components such as microprocessors (found in your oven, phone, refrigerator, washing machine, laptops, etc.) will actually be harmed if they are supplied with square wave current.

That’s fine, but what does an inverter generator contain that a regular generator doesn’t have?

In all inverter generators, you have two parts — a regular three-phase generator, and an inverter circuit. Actually, there are two inverter circuits — the first one converts the AC power from the generator into DC power, while the next one (reverse inverter) takes that DC power, filters it by running it through some special capacitors, modifies it into a pure AC signal, steps up the voltage, and sends it out to your appliance. Sounds simple on paper, but in reality the whole thing happens extremely fast and loss is kept to a minimum through all the conversion processes while also maintaining the integrity of the output signal.

Video | Yamaha Generator vs Competitor Generators

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What to Consider when Buying an Inverter Generator

There are literally thousands of models out there, and almost every manufacture will be running around claiming that their product is “THE ONE”. However the biggest and costliest inverter generator doesn’t always have to be the best. You see, the best inverter generator out there is going to be the one that is best for YOU. For determining which inverter generator is best for you, there are some parameters that you need to focus on. Discover what you truly need by answering these questions-

— How much power?

Watch the video below to help you answer a common question: How big of a generator do I need?

✓ TIP: Visit the Yamaha site to learn more about generator sizing or read our own resource : What Size Generator Do I Need?

Generally, you can know about the power requirements of your home or RV by adding up the wattage ratings of all the components that you expect to be running at the same time from your generator. Take that number, and add another 20-25% on top for future expansion. That should be the generator wattage you need to aim for. For example, let’s say you’re getting a generator for supplying power at your next outdoor camping trip. You must first make a list of all the components that are expected to run at the same time, and think of all the possible combinations.

Take the combination with the highest power requirement and add 20-25% on top. For example, your portable toaster will probably use 600 watts, while the compact electric barbecue will use around 1200 watts. Add in 200 watts for lighting, and if you plan on using a laptop add another 250 watts. That brings our total to nearly 2250 watts. Get a 2500+ watt inverter generator to stay safe.

However, if you plan on getting an inverter generator for your RV, your rooftop AC alone will eat up 2500-2800 watts of power. Then your microwave will take up another 1000 watts, while the TV will pull another 120-150 watts. So you must get an inverter generator rated at 4000W, or above to power all of this stuff. Generators that supply more power will require extra fuel per minute to function, although modern inverter generators only use as much fuel as is required.

Yamaha EF1000iS | 1000 Watt Inverter Generator

For example, your 4000W generator will probably consume the same amount of fuel (smart engine speed modification, remember?) as your 1000W ultra-compact generator if both are supplying power to appliances rated at the exact same wattage. IE. if both are connected to similar loads.

— How much time?

By time, we mean up-time or run-time for your new inverter generator. If you plan on using it to supply power for a camping trip or picnic, then you probably need a medium-large capacity fuel tank in the generator. Yes, you can refill it, but having a larger tank means that pauses in power will be less frequent since you might want to shut down the generator while refilling it. However, if you just want a generator to power a few lights and fans during a power cut, then even a small tank will suffice. Of course, it all depends on how frequently the power goes down in your area, and how many appliances you need to run at the same time.

— How much size?

Size is not the first point of attention while purchasing an inverter generator, since most of these units tend to be pretty compact anyways, even the ones with a large power generation capacity. But, if you are traveling with your generator inside the RV or boat, then size can end up mattering quite a lot.

Apart from all of these major points, you’ll also need to consider the safety features and usability of the generator, as well as maintenance and price. Some inverter generators will also come with parallel operation ability, and most include ports for cables with which you can daisy chain two inverters. If you require 2000 W of power and you have two 1000W generators lying nearby, then you can daisy chain them together to generate the required 2000 watts. This is a feature that is almost completely exclusive to inverter generators, and is not found in conventional generators.

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Yamaha EF2400iSHC | Best Inverter Generator

2400 starting watts / 2000 running watts / 171 cc / 75 lbs.

Features:

• 2400 starting watts/ 2000 running watts
• 171cc engine: OHV, air-cooled, single cylinder, 4-stroke
• Noise level : 53 – 60 dBA (1/4 Load – Rated Load)
• CARB and EPA compliant. Meets the strictest emission guidelines.
• Gasoline petcock makes it easy to  shut off the gas to run the carburetor dry for storage and prevents stale gas issues.
• Fuel gauge enables you to quickly see how fuel remains.
• High Current output engineered to increase motor starting efficiency and to improve air conditioner starting.
• Sturdy and lightweight thanks to the aluminum die-cast frame, combined with an aluminum TCI rotor and other weight-saving measures. Weighs only 75 pounds.
• Pulse Width Modulation (PWM) to produce clean electricity comparable to the power supplied by public utilities. Can safely run all of your sensitive electronics.
• Smart Throttle automatically adjusts engine speed to match the current load demands.
• Quiet operation; designed for optimal fuel efficiency, and a run time of 8.6 hours at 1/4-capacity load.
• Oil Watch Warning System automatically turns off engine if low oil is detected.
• 3-year limited warranty. Covers the Yamaha generator for defects in parts and workmanship for three (3) years. (read full warranty details)

✓ Documents — Yamaha EF2400iSHC

• View or download the MANUAL.
• View or download the SPECS & FEATURES.
• View or download the WARRANTY details.
• View or download the Yamaha GENERATOR BROCHURE.

Overview

If you want a versatile and reliable inverter generator to take with you on camping trips and picnics, then this is one of the best options for you in the market right now. It is made by Yamaha, a company that needs no introduction. These guys manufacture some of the best audio equipment and motorbikes, and their expertise in motor design has been the key to their success in the realm of compact power generators.

The entire EF2XXX series is highly regarded by consumers and reviewers alike, due to its rugged die-cast aluminum construction, portability, and surprisingly easy operation. The model we have over here is the EF2400iSHC, a mid-sized inverter generator that aims to fit into the sub-1500 dollar generator market, and it provides amazing bang for the buck.

Starting things off with some performance figures, we find out that this generator is capable of hitting a starting power output of 2400 watts, with a sustained supply capacity of 2000 watts. And it does all of that while maintaining a noise level of less than 60 decibels at all times, even when the 171cc 4-stroke engine spins at its maximum rated speed of 3400rpm. And in case you have connected something like a laptop or digital TV to the load end, the automatic throttling unit will detect a decrease in load and run the engine on lower speeds in order to increase run-time and decrease noise.

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✓ TIP : Some electrical appliances or general-purpose electric motors have high starting currents, and cannot therefore be used, even if they lie within the supply ranges given. Check the manual for the specific device you intend to run to make sure it’s below the maximum starting watts (2400W) for the Yamaha EF2400iSHC.

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If the generator works at 25% of its maximum continuous load, it will output a measly 53 decibels of noise which is actually the equivalent of what we hear during conversation with other people in close quarters.

All of that seems great, but what about the safety and usability? Well, it appears that Yamaha didn’t make any compromises on those either. They threw in a special oil monitoring system that constantly keeps tabs on the engine oil levels in order to make sure that it never ventures into the critically low territory while the engine is running. If that happens, then the oil-watch system will shut down the engine automatically. In terms of usability, the EF2400iSHC comes with a fully removable back panel to allow for easy servicing, and the conveniently placed fuel gauge allows you to keep an eye on the fuel levels at all times.

Rear View | Yamaha EF2400iSHC

This generator is fully compatible with all EPA and CARB emission engine durability norms, and its emission engine durability ratings far exceeds that of most competing models. The entire generator is covered for defects in parts or workmanship up to 3 years, so you are guaranteed peace of mind when you purchase one of these.

Other Yamaha generators in the series:

*All CARB Compliant

• EF2000iSv2 — 2000W | Inverter generator | Ultra-portable & Quiet
• EF2000iSCH — 2000W | Inverter generator | Camo Design
• EF2800i — 2800W | Portable Generator

Key Features

• High Current Output designed to greatly improve motor starting capability, and is capable of starting modern 13000 BTU AC in temperatures as high as 110°F.
• Conveniently positioned controls and fuel gauge
• Uses PWM (Pulse Width Modulation) to provide high quality, clean AC power that is similar to the power supplied by public utility companies.
• Aluminum die-cast frame and aluminum TCI rotor to maintain structural integrity and low weight.
• Yamaha Smart Throttle automatically adjusts engine speed in accordance with changing loads, so you get maximum run-time out of the 1.6 gallon fuel tank.
• A special oil level monitoring system always keeps an eye on engine oil levels and will instantly shut down the motor if oil levels get too low, so that the engine doesn’t get damaged.

Video | How to Change the Oil on the EF2400iSHC

After looking at the technical specifications, one thing is clear- the EF2400iSHC is an amazing choice if you plan on buying a generator for powering your appliances during a picnic, camping trip, or fishing expedition. Why you ask? Well, take a look at the power rating — 2000 watts of continuous power. Then observe the dimensions and weight of this machine — it measures 20.8” x 16.5” x 18.2”, and only weighs 75 pounds when dry. The fuel tank is a generous 1.6 gallons in capacity, which is anywhere between 0.6 to 0.3 gallons more than what similarly priced competitors offer.

What does this all mean? Well, you’ll be able to squeeze some extra run-time out of this petite generator, and if you constantly run it at 25% load (500W), it will last for more than 8 hours (8.1 actually) on a full tank. Impressive, isn’t it? Well, it is all because of the way this efficient 4-stroke single cylinder engine is designed, and a really advanced ECU chip (Engine Control Unit).

The cast iron cylinder liner allows the piston to glide smoothly during motion, so the rpm never fluctuates even after several hours of continuous usage. Constant rpm levels result in much more stable power delivery, with nearly zero fluctuation in voltage or current levels.

Talking of smooth power delivery, do you remember our little discussion regarding clean AC power? Well, there is plenty of that coming out of the Yamaha EF2400iSHC, thanks to the advanced PWM circuitry (Pulse Width Modulation) inside the die-cast aluminum frame of this little generator. The PWM unit automatically adjusts the output waveform, so you get output current that is almost identical in quality to that which is supplied by public utility companies via your wall outlet.

Technical Specifications:

• Alternator Type : Brushless Maximum AC output (starting output) — 2400 watts
• Continuous AC output : 2000 watts
• Weight (dry) : 75 pounds
• Fuel Tank Capacity : 1.6 gallons
• Noise Level : 53 dBA (25% load), up to 60 dBA (maximum continuous load)
• Type : Brushless, Inverter AC Generator
• Rated / Maximum AC Current : 16.7 / 20 amps @ 120V
• Engine : OHV, air-cooled, single cylinder, 4-stroke
• Engine displacement : 171cc
• Engine Speed @ Maximum Output : 3400 rpm
• Includes : 12V Battery Charge Cord
• DC Output : 8 amps @ 12V
• Size : 20.8″ L x 16.5″ W x 18.2″ H
• Fuel Tank Capacity : 1.6 gal
• Continuous Operation at 1/4 Rated Load : 11 hr
• Warranty : 3 Years Limited Warranty

You can charge ATV, car, RV, motorcycle, and marine batteries through the 12 V DC outlet and cable that is provided alongside this generator. A three-year warranty ensures complete peace of mind, and it covers both parts as well as workmanship. In terms of emission and engine durability ratings, the EF2400iSHC is definitely one of the best generators out there as it is compliant with both EPA as well as CARB regulations, and it meets the emission regulations of over 50 states.

— Pros

Great performance per dollar, clean AC power delivery, highly portable, smart engine speed control, efficient 4-stroke OHV engine, aluminum die-cast frame, meets emissions norms of 50 states, and is compliant with both EPA as well as CARB regulations.

— Cons

Could use a slightly larger fuel tank because it is rated at 2000 W, and even though the runtime is pretty good at 25% rated power, it falls short if the generator is running at 75%+ load most of the time. Also, the dual side-mounted carry handles are great because this is a 75 pound machine, but some transportation wheels would have been a great addition, along with an elongated handle so that just one person can transport it from one place to the other using the wheels.

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Compare the Yamaha EF2400iSHC to…

Yamaha EF3000iSEB | 3500W Inverter Generator

Starting Watts : 3500 watt (incorporates 500 watt boost) / Running Watts: 2800W

Features (EF3000iSEB) :

• Yamaha Boost Technology (YBT) — Boosts output by adding battery voltage to alternator output when needed. The Boost Control Unit (BCU) senses when extra power is needed and boosts output for up to 10 seconds, giving air conditioners, power tools, and other equipment the extra boost of power required to start.
• Noise Block, acoustically designed sound reduction system — Sound absorbing material, used in key locations enable this generator to run quietly.
• Innovative muffler design and molded fan greatly reduces noise.
• Intelligent Throttle, load sensing rpm control — Automatically adjusts engine speed to match the load.
• Continuous operation for up to 18.6 hours without refueling (at 1/4 rated load with “Smart Throttle” function on).
• 12 Volt DC output, battery charging cables included — Recharge 12-volt batteries for RV, auto, marine, etc.
• Inverter system with Pulse Width Modulation (PWM) control — Can safely run all of your sensitive electronics.
• Centralized control panel — Well-laid out controls make it easy to operate.
• Electric starter — Effortless starting and ease of operation (battery included).
• 171cc Overhead Valve (OHV) engine — Reliable, efficient and quiet.
• Oil Watch Warning system — Shuts off if your engine oil is low.
• Four wheels with parking brake. Take it anywhere.
• EPA & CARB Compliant.
• Three year warranty.
• Legal in all 50 states. Meets or exceeds the strictest emission standards.

✓ View or download the MANUAL for the Yamaha EF3000iSEB.

Video | Learn all about the features of the Yamaha EF3000iSEB 

Overview | Yamaha EF3000iSEB

As you can see by the features listed above, the Yamaha EF3000iSEB boasts a larger maximum wattage as well as continuous wattage than our beloved EF2400iSHC. However, it is more expensive than the EF2400iSHC, and weighs more than twice as much. Sure, the fuel tank is larger and it is capable of running for more than twice as long on 25% power, but we highly doubt that you’ll be running a generator with such a high power output on 25% load, unless you just bought a big and expensive inverter generator because you have money to spare.

You need to think about how you intend to use your generator and be honest with yourself. But, I will say that the prevalent advice when choosing a generator is it’s always better to have more power than you ‘think’ you’ll need as opposed to what many people do and underestimate their needs and end up buying a generator with ‘not enough’ power. More is better when it comes to selecting a generator, especially if you’re shopping for an emergency generator.

Ultra-Portable | Yamaha EF3000iSEB | Professional Quality

If you’re buying something this powerful and heavy, it will probably be used for powering small in-house parties (especially the DJ’s rig and the lighting), and for running the home during times of emergency such as floods, storms, etc. The extra 500 W of boost-power during startup is very useful, as it allows this generator to start up large fridges and 15000+ BTU AC’s even in the middle of summer, when temperatures are really high (110-120°F).

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Compare the Yamaha EF2400iSHC to…

Yamaha EF2000iSv2 | 2000W Inverter Generator

Starting Watts : 2000W / Running Watts : 1600W

The Yamaha EF2000iSv2 (version 2) vs EF2000iS (original model)?

The EF2000iSv2 incorporates a completely new controller with advanced programming resulting in improved output characteristics between 1600w-2000w operation ranges. The addition of the new programming allows the EF2000iSv2 the ability to power a much wider range of applications than previous generation EF2000iS.

Essentially, the Yamaha EF2000iSv2 looks the same on the outside but has some improved internal systems that optimizes the way it powers electronic devices at higher ranges. In a nutshell, it’s more capable at handling higher load electronics, but the features are identical.

Features (Yamaha EF2000iSv2) :

• Compact — 2.2 cu.ft. size highly portable.
• Twin Tech (Parallel generator operation) – The EF2000iSv2 can be operated in parallel to deliver up to 30 amps.
• Parallel generator operation – The EF2000iSv2 may be connected in parallel with an earlier model Yamaha EF2000iS.*
• New controller with advanced programming – The addition of the new programming allows the EF2000iSv2 the ability to power a much wider range of applications than previous generation EF2000iS.
• Smart Throttle varies engine speed based on load — Improves fuel economy and reduces noise. Runs up to 10.5 hours at ¼ rated load on a tank of gas.
• Gasoline petcock – lets you shut off the gas to run the carb dry for storage and helps prevent stale gas problems.
• Fuel gauge — See fuel gauge at-a-glance.
• Inverter system with Pulse Width Modulation (PWM) control — Produces a pure sine wave to run products with built-in microcomputers or microcomputer-controlled electric tools
• OHV engine with cast iron cylinder liner — Efficient, reliable, powerful providing long life and excellent heat dissipation.
• OHV engine — Includes steel camshaft and valve train components.
• EPA & CARB Emission Engine Durability Rating — Yamaha generators have the longest emission engine durability ratings issued by the Environmental Protection Agency and the California Air Resources Board.
• Oil Watch Warning system — Prevents engine damage caused by low oil, avoiding costly repairs and minimizing down time, adding customer confidence and peace of mind.
• Auto-decompression system — Reduces compression for easier starting.
• Comfortable grip handle — Easy portability and storage.
• Electrical overload breaker — Prevents generator damage in case of overload.
• Centralized controls — Easy access to controls.
• DC Outlet — 8A 12V outlet for charging batteries (cables included).
• Rubber vibration isolation feet — Absorbing feet for smooth operation and noise reduction.

Documents for the Yamaha EF2000iSv2:

• ✓ View or download the MANUAL.
• ✓ View or download the SPECS & FEATURES.

Overview | Yamaha EF2000iSv2 

The EF2000iSv2 is an excellent inverter generator as well and it’s less expensive than the EF2400iSHC, it delivers some pretty impressive specs and appears to be one of the quietest generators available on the market. The noise level on 25% of the rated maximum continuous load is just 51.5 decibels, and it barely goes above 60 decibels when the little 79 cc engine runs on maximum speed.

Yamaha EF2000iSv2 | Run in Parallel | 30 Amps of Power

One thing to be noted over here is that the entire unit occupies less than 2.2 cubic feet of space, and weighs less than 45 pounds when dry. You can connect two of these and run them in parallel to get 3200 watts of clean and continuous AC power, giving you more power than the Yamaha EF2400iSHC. It’s an alternative option I recommend because in many ways it provides more versatility. For example, you’d have two separate generators that can be used separately, but when you need more power you can easily combine them to suit your needs. And, it’s easier to move around because the weight is split between two units.

Video | Yamaha EF2000iSv2

Compared to the much more expensive Yamaha EF3000iSEB, this dual generator setup will generate more continuous power, even though it will be lacking in terms of starting power (if the EF3000iSEB uses its boosted starting power). Even when you combine two of these by connecting them through the special cable, you’ll end up with a net generator mass of less than 90 pounds dry.

For an in-depth information you’ll find our article on the original model (EF2000iS) to be helpful in painting a full picture of what this generator can do.

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Compare the Yamaha EF2400iSHC to…

Yamaha EF1000iS | 1000W Inverter Generator

Starting Watts : 1000W / Running Watts : 900W / 50cc

Features:

• Lightweight, easy to carry design — Compact lightweight alternator reduces weight to 27.9 lb., the lightest weight in its class
• Smart Throttle, load sensing rpm control — Greater fuel efficiency and noise reduction by automatically adjusting engine speed to match the load
• Auto Warm-up — Automatically increases engine speed for 4~6 minutes to ensure smooth power delivery during cold start ups
• 12 Volt DC output, battery-charging cables included — Recharge 12-volt batteries for RV, auto, marine, etc.
• Exclusive dual coil alternator stator — Greater output at a lower engine speed for reduced noise, fuel consumption, and engine wear
• Centralized control panel — Easy access to controls
• Gasoline petcock lets you shut off the gas to run the carb dry for storage — Prevents stale gas problems
• 50cc Overhead Valve (OHV) engine — Noise-reducing operation with improved efficiency, increased reliability, and low oil consumption
• Large fuel fill access — Wide mouth fuel fill reduces spilling and overflows during refueling
• EPA & CARB Emission Engine Durability Rating — Yamaha generators have the longest emission engine durability ratings issued by the Environmental Protection Agency and the California Air Resources Board
• Can be used in all 50 states. CARB and EPA approved.

Documents for the Yamaha EF1000iS:

• ✓ View or download the MANUAL.
• ✓ View or download the SPECS & FEATURE sheet.

Overview |  Yamaha EF1000iS

This particular generator is not exactly a direct competitor to the EF2400iSHC, however you can run two Yamaha EF1000iS generators in parallel to get 1800 watts (running watts) of clean and uninterrupted AC power. That is pretty close to the 2000 watt continuous power delivery rating of the EF2400iSHC, however you need to keep in mind that stringing together two EF1000iS generators does not give you the same starting power as the former. However, you’ll be getting 11.9 hour of run time on 25% load, compared to the 11 hours that you get on a single EF2400iSHC.

Illustration of Internal Components

Well, 54 minutes more is not a big difference, but is still an advantage, at least on paper. Real world performance will differ, and we would definitely recommend a 1.6 gallon fuel tank over a 0.66 gallon tank, even if the smaller generator only uses a 50 cc engine. The biggest advantage that a dual EF1000iS setup has over a single EF2400iSHC is net weight.

Would you rather prefer two separate 27.9 pound units connected via a cable, or a single 75-pounder? Would you like extra starting voltage and slightly greater continuous power output, or do you prefer super low noise production and emissions? Keep in mind the fact that a single EF1000iS generates only 47 decibels of load under 25% of load, and 57 decibels under maximum load.

For reference, 44 decibels is the acceptable noise level in a library, or the amount of sound made by little birds when they chirp. Without a doubt, the Yamaha EF1000iS is one of the quietest inverter generators on the planet, so if you prefer to keep noise levels low this might be a great choice for you. Also, two EF1000iS generators will cost you more than a single EF2400iSHC, so keep that in mind. A single EF1000iS is optimal for light usage at home during a power outage, say for example in your study room. You can easily power your laptop, a couple of lights, a printer, and a fan with 900 watts. Or, you can use it during a picnic to power a coffee maker/toaster/microwave.

Tech Specs (Yamaha EF1000iS):

• Maximum AC Output : 1000 watts
• Rated AC Output : 900 watts
• Rated / Maximum AC Current : 7.5 /8.3 amps @ 120V
• Voltage Stability : ± 1%
• Frequency Stability : ± 0.1 HZ
• Engine : OHV, air-cooled, single cylinder, 4-stroke
• Displacement : 50cc
• Size: L x W x H : 17.7 x 9.4 x 14.9 in
• DC Output : 8 amps @ 12V
• Dry Weight : 27.9 lb
• Fuel Tank Capacity : 0.66 gal
• Continuous Operation at 1/4 Rated Load : 11.9 hr
• Noise Level (1/4 Load – Rated Load) : 47- 57 dBA
• Engine Speed @ 1/4 Load : 3000 rpm
• Includes Battery Charge Cord
• Warranty : 3 Years Limited Warranty (except commercial/rental use = 2 year warranty)

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How to Safely Operate your Yamaha EF2400iSHC Generator

In order to safely operate the Yamaha EF2400iSHC, you need to follow some very basic rules. You can look up the startup and configuration instructions from the instruction booklet itself, so we will not be listing the same stuff over here, as the setup and pre-run guidelines can vary from model to model.

The first thing you need to know while operating the EF2400iSHC is that the oil levels always need to be maintained above 30% of maximum capacity. Of course this is true for any generator, however the EF2400iSHC makes it especially easy for you to change and refill the oil, thanks to the hatch-style oil tank cover that is present on the front panel. Inside, you’ll find a dip stick type tank opening, similar to those found on automobiles. The maximum capacity of the engine oil tank is 0.6 quarts, and there is a plastic plug on the base of the generator that can be pulled out to empty the used up engine oil.

If you need to access the motor, exhaust, spark plug, etc. then you need to remove the 2 side panels as well as the back panel. Using a powered screwdriver, the entire process should take no more than a couple of minutes, since you need to remove a total of 6 screws, 2 for each one of the three panels.

The spark plug needs to be replaced every year ton ensure optimal running conditions, while the air filter can be easily removed and cleaned by removing a few screws that hold it onto the aluminum chassis. You also need to check the exhaust and de-clog the end by removing the clamp that holds the tail pipe. This procedure should be done at least once every year if you use the generator on a regular basis.

Whenever you open up the generator for maintenance, make sure that the generator is completely unplugged and there are no visible external oil leaks. Also, use the generator in an open area and away from the living area. Don’t position it under windows or in front of hatches, doors, etc. because the carbon monoxide from a generators exhaust is potentially fatal and is completely odorless.

If too much carbon monoxide accumulates in the room, you could face the threat of potential suffocation. Remember — DO NOT use the generator near HVAC vents, open windows, or open drain pipes that lead into the house. Carbon monoxide is an extremely dangerous gas, not because of its toxicity, but because of its odorless nature.

You need to inhale a quarter room of carbon monoxide gas in order to go into some sort of cardiac arrest of lung failure, but the scariest part is that you don’t even know that you’re breathing in it until the room is filled with a significant amount of the gas. So keep the generator at a safe distance from any possible entry points into the house, and NEVER use a generator inside a room.

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Is the Yamaha EF2400iSHC a Good Purchase?

If the 2000 watts of continuous power meets all your needs, and you don’t plan on using this generator for powering appliances all day long, then we wholeheartedly recommend this generator due to its clean power delivery, consistent performance (near zero voltage and current fluctuations), portability, and easy maintenance. It is built from premium grade aluminum, features a reliable 4-stroke OHV engine, and hits that elusive sweet spot between all-out performance and affordability.

If you go on camping trips or use the RV regularly, then the Yamaha EF2400iSHC is definitely one of the best inverter generators that you can get. It’s not the cheapest generator but if you want professional quality that you can depend on then it’s worth every penny.

Yamaha truly is a great company with a reputation in high regards across the board. We’ve made an attempt to inform you about some fantastic Yamaha generators that we feel is worth your hard-earned money. If you want more information we suggest you visit the Yamaha site and do your own research.