Every family that travels outdoors should have their own portable generator. They’re great machines for providing electricity to places without power outlets, such as in the forest during camping trips. They can also be used during emergency situations like blackouts at home, though portable generators won’t provide your entire home with power to keep your fridges, ACs, and TVs running.

Inverter generators are the latest and best type of portable generator since they produce super-clean and stable energy to power your delicate electronics (tablets, laptops, Smartphones).

Yamaha EF1000iS vs EF2000iSv2

Yamaha EF1000iS

In this article, we’re going to take a look at two of Yamaha’s best inverter generator models: the Yamaha EF1000iS and the Yamaha EF2000iSv2. Yamaha is a beast when it comes to manufacturing inverter generators, and it’s no surprise that both of these models have received overwhelmingly positive reviews from their customers. However, between the two models, which one is the better optionLet’s find out together.

ToolPowers is supported by readers. We don't want to annoy you with display ads, but we do include links to products. When you buy with our links, we may earn a commission.

Surge and Running Wattages

This machine has a surge and running wattage rating of 1,000 and 900 watts, respectively. Compared to other portable generators, this machine can be categorized as a “small” generator for supplying power to a very limited number of devices.

Yamaha EF2000iSv2 vs EF1000iS

Yamaha EF2000iSv2

This inverter generator is rated at 2,000 and 1,600 watts (surge and running, respectively). It supplies twice as much kick-starting power as the EF1000iS but with a less proportionate running wattage. Your first consideration when purchasing an inverter generator should be how many devices you need plugged in. This should tell you how much power your generator should supply.

Conclusion: The surge wattage refers to how much power the inverter generator can provide to kick-start electronics to life, whereas the running wattage means the total capacity the generator can provide to electronics continuously. Higher surge and running wattages mean you can plug in more devices simultaneously. The EF2000iSv2 is the bigger model in this sense, though you might not exactly need more power if you only have a few gadgets that need charging.

Running Time

Running time refers to how long the generator can run continuously. Usually, running time is evaluated based on a quarter-load of a generator’s full capacity. The EF1000iS can provide up to 225 watts of power for up to 12 hours on a single full tank of gas (0.66 gallons).

As for the EF2000iSv2, on a quarter-load (400 watts), it can run for 10-1/2 hours without fail on a full tank (1.1 gallons). Remember that it takes more fuel to supply greater amounts of energy, thus the disproportionate fuel efficiency.

Yamaha EF1000iS

Yamaha EF1000iS

Conclusion: It’s known that larger, beefier inverter generators have worse fuel economy than smaller models, but once again, your first concern should be how much power you need for your most crucial devices. Although the EF2000iSv2 is considerably less fuel-efficient than the smaller EF1000iS, if you need more power, the EF1000iS can do nothing for you.

Noise Production

The range of noise production that comes from the EF1000iS is only about 47 to 57 decibels. Basically, you can still hold a conversation when the machine is running 15 to 20 feet away from you.

Because the EF2000iSv2 is larger, it will produce a bit more noise, even when running at a quarter of its full capacity. The noise production range is between 51 and 61 decibels, which isn’t much different from the EF1000iS.

Conclusion: When running a portable generator out in the woods, you’ll want a machine that doesn’t produce a lot of noise. Noise won’t attract bears or other predators, but it can be disturbing having to hear a constant droning in the background. We’re glad that Yamaha implemented their sound-blocking system to keep the noise production of these two models to a minimum.

Yamaha EF2000iSv2

Yamaha EF2000iSv2


The dry weight of the EF1000iS is only about 28 pounds. Loading and unloading the unit to and from your truck or RV is so easily done that you can employ your 10-year-old child to do it without lending him or her a helping hand.

This machine is considerably heavier than the EF1000iS, though it can still be categorized as lightweight since lifting it with a single hand is still manageable. Without fuel and oil, the EF2000iSv2 weighs 44.1 pounds.

Conclusion: Weight won’t be a big problem, especially if the machine comes with all-terrain wheels, a telescoping handle, or other features that make it either lightweight or portable. Unfortunately, the neither of these machines have wheels or telescoping handles, but they’re sufficiently lightweight that they don’t need them.

Parallel Connection

A parallel connection allows two generators, either the same models or models of the same series, to connect to each other and supply even more portable power. The EF1000iS, unfortunately, doesn’t have any parallel ports, so you’re “stuck” with 1,000/900 watts with this generator.

Yamaha EF1000iS vs EF2000iSv2: Gas Powered Portable Inverter Comparison

The inverter generator can be hooked up to other EF2000iSv2 models. You can supply your home or RV with twice as much portable power using a parallel cord. You’ll have to purchase the cord separately since it doesn’t come with this kit.

Conclusion: If you need more power, then hooking your EF2000iSv2 to another one could give you twice as much energy, though it might be more cost-effective to purchase a single generator that provides more power than getting two EF200iSv2s. This feature is handy if you and a travel partner have the exact same model.

Yamaha Portable Inverters: Verdict

In the end, the portable inverter generator you purchase should depend on your specific needs. If you need a generator just for keeping your laptop and a few Smartphones charged during blackouts or on outdoor trips, the EF1000iS would probably be the better solution.

If you need more power capacity, you can skip the Yamaha EF1000iS and get the Yamaha EF2000iSv2 instead. They both function the same, have the same safety features in place and work extremely well on the road, so the only thing you need to ask yourself when considering both of these models is whether you need 900 or 1,600 running watts.

Yamaha EF2000iSv2 vs EF1000iS: Gas Powered Portable Inverter Comparison

Recommended Portable Inverter Generators
Honda EU2200IC 2200-Watt Companion Super Quiet Portable Inverter GeneratorChampion 3800-Watt Dual Fuel RV Ready Portable Generator with Electric StartWEN 56200i Super Quiet 2000-Watt Portable Inverter Generator, CARB Compliant
21 x 20 x 14 in26.3 x 24.8 x 22.9 in18 x 11 x 18 in
46.5 pounds122 pounds48 pounds

Newsletter Signup

The Best of ToolPowers in Your Inbox!

We’d love to stay in touch, sign up for the ToolPowers team to contact you with great news, content and offers.