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| Specification | Genmax GM5500i | Yamaha EF5500D |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | No |
| Parallel capable | No | No |
| RV ready | No | No |
| Running watts | Winner: Winner: 5000 W | 4500 W |
| Starting watts | Winner: Winner: 5500 W | Winner: Winner: 5500 W |
| Noise (lower limit) | Winner: Winner: 62 dB | 74.1 dB |
| Weight | Winner: Winner: 116.6 lbs | 216.1 lbs |
| Run time @50% load | 8.5 h | Winner: Winner: 13.5 h |
| Run time @25% load | 13 h | Not available |
| Fuel tank | 3.5 gal | 6.9 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 21.1 x 18.5 x 24 | 29.1 x 29 x 31.5 in |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240V 60 Hz |
| Voltage (DC) | 5 | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | No | Yes |
| THD | ≤3% % | Not available |
| Engine | ||
| Engine | 312 cc OHV 4-stroke | Yamaha MZ360 OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil |
| Warranty | ||
| Warranty | 1 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 5000 W | 4500 W |
| Starting watts | 5500 W | 5500 W |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 8.5 h | 13.5 h |
| Run time @25% load | 13 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 768494055455 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 5000 | 4500 |
| Starting Watts (Gasoline) | 5500 | 5500 |
| Runtime @ 50% Load (Gasoline) | 8.5 | 13.5 |
| Runtime @ 25% Load (Gasoline) | 13 | Not available |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R) | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Dinking OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 312 | 358 |
| Engine Oil Type | SAE 10W/30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 13 | Not available |
| Runtime @ 50% Load (Gasoline) | 8.5 | 13.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | No | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Not available | Yes |
| Included Accessories | Funnel, tool kit, and battery | Tool kit and wheel kit |
| Warranty & identification | ||
| Part Number | Not available | EF55DZ1 |
| Additional specs | ||
| Summary | The Genmax GM5500i is a 5,000-watt gasoline inverter generator built around a 312cc OHV engine. It delivers enough continuous power for multiple household appliances, power tools, and sensitive electronics simultaneously. Because it uses inverter technology, the GM5500i produces power clean enough for laptops, gaming consoles, and medical devices, a trait that separates it from conventional open-frame generators at similar wattage levels. | The Yamaha EF5500D is a 5500-watt generator designed for emergency backup, recreational use, and DIY projects. It features a 358cc OHV engine, dual voltage output, and offers up to 9 hours of continuous operation at rated load. |
