Yamaha EF2400iS vs Yamaha EF2800i Inverter Generators

Yamaha EF2400iS

Parallel use option

Lighter weight

Quieter operation

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Yamaha EF2800i

Increased running power

Larger fuel capacity

Longer operation time

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Portable generators are handy devices you can use to power your tools or appliances when there’s no grid power, such as on a camping trip, on a construction site, or during a blackout at home. It can be a bit tricky figuring out which generator suits your needs in terms of size, noise levels, and cost. This article will help you decide by comparing the Yamaha EF2400iS and Yamaha EF2800i Inverter Generators.

Both these models come from the renowned brand Yamaha, known for producing reliable and efficient generators. The EF2400iS is celebrated for its quiet operation and light weight, whilst the EF2800i champions being the lightest in its class. We will delve into their specifics to provide you with an easier understanding of which one may suit your situation best.

Performance & Power

Running Power (W): The EF2400iS provides 2400W whereas the EF2800i offers slightly more at 2800W. This measure indicates how much power each generator can provide continuously. It’s critical to ensure your equipment doesn’t require more than this output. For instance, both generators could comfortably run a large air conditioning unit (2000W) or an air compressor (2200W).

Starting Power (W): The peak starting power of both models is similar – 4000W. This value tells us that both generators can supply a short burst of intense power when needed – important for starting up appliances with larger motors.

Engine type: Both generators house a 171 cc OHV 4-stroke engine using petrol as fuel. OHV stands for ‘Overhead Valve,’ meaning these engines have a compact and robust design contributing positively to fuel efficiency, lifespan, and improved energy output.

Rated Output (kVA): The EF2400iS has a rated output of 2kVA, with the EF2800i being slightly higher at 2.5kVA. These values reflect the apparent power of the generator, combining real and reactive powers. Reactive power is needed to operate some equipment. You might need a generator with higher kVA than what you’d expect from wattage alone for devices pulling high currents.

Inverter: Notably, both models have inverter technology. This means they generate cleaner power, essential when powering sensitive electronics like laptops. Due to this technology, these generators usually run quieter and are more fuel-efficient.

Fuel & Run Time

Fuel Type: The EF2400iS and EF2800i each run on petrol.

Fuel Tank Capacity: The EF2400iS carries a smaller fuel tank at 6 litres while the EF2800i holds nearly double that at 11.2 litres. This denotes that with the EF2800i you will get longer periods between refills but the trade-off is increased weight.

Run Time: The larger fuel tank does indeed provide the EF2800i with an advantage, it can run for up to 17 hours at quarter load compared to the EF2400iS which gets about 9 hours. These figures suggest that if repetitive refuelling isn’t your hobby, then you might lean towards the model capable of a lengthier operation without need for refuelling.

Physical Specs

Dry Weight: Interestingly, despite possessing a larger fuel capacity, the EF2800i weighs less (29kg) compared to the EF2400iS (32kg). This difference could impact how easy each model is to move around or store.

Size: In terms of dimensions, both units are compact – but here again, surprisingly given its higher power and run-time, the EF2800i holds a slight advantage being a bit smaller than the EF2400iS.

Wheels: Neither of the generators comes with wheels. While these units are relatively light compared to some models and hence more portable, wheels would certainly make them easier to manoeuvre.

Outlets & Parallel Use

AC Outlets: Both the EF2400iS and the EF2800i feature 2 AC outlets – allowing you to simultaneously power up two appliances or tools with alternating current.

DC Outlets: The Yamaha EF2400iS has a singular 12V-8A DC outlet; however, the EF2800i lacks this outlet entirely. This means if you’re looking for battery charging or small appliance powering facilities, such as mobile phones, laptops, or LED lights via DC outlets – the EF2400iS is your best bet.

Parallel Use: The EF2400iS can run in parallel — meaning you can link two units together for doubled power output. This feature will come handy if one unit won’t meet your requirement, a big event maybe? However, this option is inadequate in the EF2800i model. If you’re considering double power for heavy-duty tasks, do check what additional accessories might be required.

Features & Usability

Both units operate using recoil starter systems and do not have any specific indicators that provide real-time performance information. They include fuel gauges and oil alert systems, helping monitor fuel levels and warn when oil levels go low, preventing engine damage. Brushless alternators reduce maintenance and enhance power efficiency. A spark arrestor restricts the emission of flammable debris reducing fire-related risks.

Noise Level

With sound emissions rated at 54dBA for the Yamaha EF2400iS and 60dBA for the Yamaha EF2800i, both generators are pretty quiet – consider comparing them to the hum of a refrigerator at 55 dBA or the sound of normal conversation at 60-70dBA.

Yamaha EF2400iS vs Yamaha EF2800i Comparison Table

FeatureYamaha EF2400iSYamaha EF2800i
Warranty4 Years4 Years
Engine Type171 cc, OHV, 4-stroke171 cc, OHV, 4-stroke
Air CooledYY
Running watts2400 W2800 W
Max / Starting watts4000 W4000 W
Voltage (AC)230 V230 V
DC Output12V / 8AN/A
AC Frequency (Hz)5050
Rated Output (kVA)22.5
Fuel Tank Capacity6 L11.2 L
Run time (Hours)9 at 1/4 load17 at 1/4 load
Dry Weight (Kg)3229
Size (L x W x H)52.7 x 41.9 x 45.9 cm48.7 x 39.5 x 42.5 cm
Number of AC Outlets22
DC Outlets1x 12VNone
Parallel useYN
Starter SystemRecoilRecoil
Fuel gaugeYY
Oil alertYY
Noise Level (dBA)5460


In conclusion, comparing the Yamaha EF2400iS and Yamaha EF2800i generators covers various factors – power, efficiency, size, convenience, and cost. The EF2400iS might be better for convenience with its DC outlet and potential for parallel use but choose the EF2800i if you are looking for higher continuous power, larger fuel tank and consequently longer run time and easier portability because of its decreased size and weight.