Compare Generators Side-by-Side
Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Firman W03661OF
- Genmax GM4600iAEFIC
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @25%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Firman W03661OF | Genmax GM4600iAEFIC |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | Yes |
| Parallel capable | Yes | Yes |
| RV ready | Yes | Yes |
| Running watts | 3650 W | Winner: Winner: 3800 W |
| Starting watts | 4500 W | Winner: Winner: 4600 W |
| Noise (lower limit) | 69 dB | Winner: Winner: 63 dB |
| Weight | 106 lbs | Winner: Winner: 58.4 lbs |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Winner: Winner: 25 h | 9 h |
| Fuel tank | 6 gal | 1.6 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 24.5 x 24.1 x 23 | 20.9 x 12.2 x 19.7 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 12 | 12 |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | 5 % |
| Engine | ||
| Engine | 208 cc OHV 4-stroke, cast iron sleeve. | 159 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 3 years | 1 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3650 W | 3800 W |
| Starting watts | 4500 W | 4600 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 | Not available | Not available |
| Run time @25% load | 25 h | 9 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA | CARB, EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | true |
| UPC | 840876136614 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3650 | 3800 |
| Starting Watts (Gasoline) | 4500 | 4600 |
| Runtime @ 25% Load (Gasoline) | 25 | 9 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 50A (14-50R) | AC outlets1x Duplex 120V 20A (5-20R)1x 120V 30A (TT-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 208 | 159 |
| Cylinder Sleeve | Cast iron sleeve | Not available |
| Engine Oil Type | Not available | SAE 0W-30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 25 | 9 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | No |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Included Accessories | Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit | Not available |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Additional specs | ||
| Summary | The Firman W03661OF is a 3650-watt inverter generator built around a 208cc OHV 4-stroke engine. This wattage class powers most household circuits simultaneously, including refrigerators, microwaves, and power tools, making it suitable for home backup and job site work. The gasoline fuel type and 6-gallon tank give users a familiar refueling experience without special infrastructure. Because this unit runs on standard fuel, users can source power anywhere gasoline is sold, a major advantage over propane or dual-fuel models. The inverter technology produces clean power at 3 percent THD, which means laptops, phones, and sensitive electronics charge safely without risk of voltage spikes. | The Genmax GM4600iAEFIC is a 3800-watt gasoline inverter generator built for users who need portable power without sacrificing output control. Its 4600-watt peak capacity handles startup surges, while the inverter design keeps electricity clean enough for laptops and sensitive devices. One person can move it. |
- Most PowerfulGenmax GM4600iAEFIC3800W running
- QuietestGenmax GM4600iAEFIC63 dB
- Longest Runtimeh at 50% load
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Firman W03661OF
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