MaxWatt 2000W vs Yamaha EF1000iS Inverter Generators

MaxWatt 2000W

More running power

Larger fuel tank

Allows parallel use

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Yamaha EF1000iS

Quieter operation

Longer run time

Lighter and more compact

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Sometimes, you need portable power – for camping, work sites, or even during power outages at home. Portable generators are great, but finding the right one can be tough. What size do you need? How loud is too loud? And then there’s the question of budget.

In this article, we’ll compare two models: The MaxWatt 2000W and the Yamaha EF1000iS. These models are praised for their clean and stable power, being safe for electronics, and their quiet operation and long run time.

We’ll look at specs like power output, engine type, fuel efficiency, physical dimensions, and extra features to decide which one might be the best fit for your needs.

Performance & Power

Running Power (W): The MaxWatt has a running power of 1600 watts, meaning it can continuously provide this amount of power. It could run appliances like a space heater (1500W) or an electric chainsaw (1200 W). On the other hand, the Yamaha EF1000iS has a lower running power of 1000 watts and could support a kettle or belt sander each requiring 1000 W. This difference can be significant if your equipment requires more power.

Starting Power (W): The MaxWatt starts with a peak power of 2000 watts while the Yamaha starts with 1600 watts. These figures matter if you’re using devices that need a high initial burst of energy to start.

Engine type: Both these generators operate on four-stroke engines – common in most generators due to their efficiency. However, while the MaxWatt uses a 79cc engine, the Yamaha uses a smaller 50cc engine but incorporates OHV technology for better fuel efficiency and longer lifespan.

Rated Output (kVA): Here, the MaxWatt has an apparent power output of 2 kVA, whereas the Yamaha has 0.9 kVA. This difference could affect your experience when using equipment that needs more current, like certain power tools.

Inverter: Both models have inverter technology. This makes them safe to use with electronics like laptops because they produce steady and clean power. It also means these generators are usually quieter and more fuel-efficient.

Fuel & Run Time

Fuel Type: Both generators operate on petrol fuel.

Fuel Tank Capacity: The MaxWatt has a 4-litre tank and the Yamaha has a smaller 2.5-litre tank. A larger tank capacity could mean fewer trips to the petrol station but it also adds to the weight of the unit.

Run Time: The Yamaha EF1000iS offers a longer run time of 12 hours at 1/4 load, while the MaxWatt provides around 6.5 hours at 50% load. So if you need your generator to run for longer periods, the Yamaha could be a better choice.

Physical Specs

Dry Weight: At just 12.7 kg, the Yamaha is lighter than the MaxWatt which weighs in at 21 kg. A lighter weight generally means easier transport and handling.

Size: Both generators are compact but the Yamaha (45 x 24 x 38 cm) is slightly smaller than the MaxWatt (46 x 25 x 50 cm). If storage space is scarce, a smaller unit might be beneficial.

Wheels: Neither model comes equipped with wheels, so they’ll need to be carried or transported during movement.

Outlets & Parallel Use

AC Outlets: Each generator provides one AC outlet for plugging in devices.

DC Outlets: The MaxWatt features a USB DC outlet of 5V at 2.1 Amps while the Yamaha has a 12V 8A outlet for charging batteries or smaller appliances like phones and laptops. The differences here are quite minor but could matter depending on what you plan to use the generator for.

Parallel Use: Only the MaxWatt allows for parallel operation which could come in handy if you needed to double your power output for larger tasks. Keep in mind though, this feature usually requires additional accessories which may not be included in the standard package.

Features & Usability

These two generators share several features such as a recoil starting system and oil alert functionality. However, the Yamaha has a brushless alternator which reduces maintenance needs and increases efficiency. The MaxWatt also has an overload indicator light to help manage its operation efficiently.

Noise Level

The Yamaha EF1000iS operates at a quieter noise level of 47 dBA while the MaxWatt produces 59 dBA of noise at seven meters distance. To put it in context, normal conversation usually falls around 60-70 dBA so these generators are relatively quiet.

MaxWatt 2000W vs Yamaha EF1000iS Comparison Table

FeatureMaxWatt 2000WYamaha EF1000iS
Warranty2 Years4 Years
Engine Type79cc, 4-stroke50 cc, OHV, 4-stroke
Air CooledYY
Running watts1600 W1000 W
Max / Starting watts2000 W1600 W
Voltage (AC)240 V230 V
DC OutputNot specified12V / 8A
AC Frequency (Hz)5050
Rated Output (kVA)20.9
Fuel Tank Capacity4 L2.5 L
Run time (Hours)6.5 at 50% load12 at 1/4 load
Dry Weight (Kg)2112.7
Size (L x W x H)46 x 25 x 50 cm45.0 x 24.0 x 38.0 cm
Number of AC Outlets11
DC Outlets1 x 5V 2.1 Amp USB1x 12V
Parallel useYN
Starter SystemRecoilRecoil
Fuel gaugeNot specifiedN
Oil alertYY
Noise Level (dBA)59 at 7m47


After comparing these models, it seems that the MaxWatt might be more suitable if you require more power and have room to handle its slightly larger size and weight. On the other hand, the Yamaha EF1000iS provides quieter operation, offers longer run time, and is lighter and more compact – ideal for camping and other outdoor adventures. Your choice between these two models will depend largely on your specific needs.