Portable generators are incredibly handy tools to have. Whether you’re going camping, hosting a small event, or simply want a back-up power source for your home, a generator can provide the electricity you need. However, deciding on the right generator can be tricky. You want one that will meet your power needs without being too loud, bulky, or over your budget. In this article, we’ll compare two popular models: the Engel R2500IS and the Yamaha EF2800i.
Both models have benefits according to their brands. The Engel R2500IS is marketed as being affordable with a solid 4-year warranty and a nation-wide service network. The Yamaha EF2800i is promoted as the lightest of its kind in its class.
We’ll assess these models based on various factors including power performance, run time and fuel efficiency, physical specs, outlets and parallel use ability, usability features and noise levels. This will give you a comprehensive understanding of these generators.
Performance & Power
Running Power (W): Engel R2500IS offers 2500 running watts while the Yamaha EF2800i provides slightly more at 2800 running watts. Both could easily power large air conditioners or air compressors rated at 2000 and 2200 watts respectively.
Starting Power (W): Here there’s a difference – while both generators have identical running power capacity, when it comes to starting power, the Yamaha EF2800i surges ahead with a maximum of 4000 watts while the Engel R2500IS stays at 2500 watts. This burst of additional power might be significant if you’re powering devices with motors which require more juice at start-up.
Engine type: Both generators run on petrol fuel but differ in size – Engel R2500IS has a smaller 122cc engine while Yamaha EF2800i offers a larger 171cc engine which is an OHV, or “Overhead Valve”. OHV engines are compact, long-lasting and present better fuel efficiency and power output.
Rated Output (kVA): Both generators have the same rated output of 2.5kVA.
Inverter: Both Engel R2500IS and Yamaha EF2800i incorporate inverter technology. This results in cleaner power, ideal for sensitive electronics like laptops.
Fuel & Run Time
Fuel Type: Both use petrol.
Fuel Tank Capacity: There’s a big difference here – Engel R2500IS has a 4.5L tank versus the Yamaha EF2800i’s larger 11.2L capacity. The larger tank should mean much less frequent refuelling on the Yamaha model.
Run Time: Though their fuel capacities differ, run times vary significantly. The Yamaha EF2800i boasts a lengthy 17 hours at quarter load, while the Engel R2500IS can only manage about 3 hours at full load. Clearly, the Yamaha model wins out in this category if extended run times are a necessity for you.
Dry Weight: Engel R2500IS weighs less at 23.5kg, compared to Yamaha EF2800i’s more substantial 29kg. The lighter Engel generator may be easier to move around.
Size: The dimensions of these models are similar. The Engel measures slightly taller but overall has less width and depth than the Yamaha model.
Wheels: Both models do not come with wheels for portability.
Outlets & Parallel Use
AC Outlets: Here, Yamaha EF2800i features two outlets versus one on Engel R2500IS.
DC Outlets: Engel R2500IS provides USB outlets designed for smaller devices, while Yamaha EF2800i has none.
Parallel Use: The Engel model allows for running two units in parallel for double power output, an option not available on the Yamaha unit.
Features & Usability
Features: Both generators feature recoil start systems and have fuel gauges. Yamaha EF2800i features an oil alert system and also boasts a brushless alternator for improved efficiency. However, specifics about indicators, safety features and included accessories aren’t available for both.
At 7 meters, the Engel R2500IS operates at 68 dBA whereas Yamaha EF2800i operates quieter at 60 dBA – equivalent to a normal conversation, making the Yamaha more suitable if low noise level is your priority.
Engel R2500IS vs Yamaha EF2800i Comparison Table
|171 cc, OHV, 4-stroke
|Max / Starting watts
|USB 1A 5V, 2.1A 5V
|AC Frequency (Hz)
|Rated Output (kVA)
|Fuel Tank Capacity
|Run time (Hours)
|3h (full load)
|17 at 1/4 load
|Dry Weight (Kg)
|Size (L x W x H)
|52 x 32 x 46 cm
|48.7 x 39.5 x 42.5 cm
|Number of AC Outlets
|1 x 15 amp
|USB 1A 5V, 2.1A 5V
|Noise Level (dBA)
|68 at 7m
Summing it up, Engel R2500IS might suit those who want a lighter generator with basic but reliable features and parallel use capability. On the other hand, Yamaha EF2800i would be perfect for someone who needs more power, longer run times and quieter operation.