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 W03381
- Aceup Energy AI4000DS
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 @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Firman W03381 | Aceup Energy AI4000DS |
|---|---|---|
| General | ||
| Product type | Generator | Not available |
| Fuel | Gasoline | Not available |
| Inverter | Yes | No |
| Parallel capable | Yes | Yes |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 3300 W | 3200 W |
| Starting watts | 3650 W | Winner: Winner: 4000 W |
| Noise (lower limit) | 58 dB | Winner: Winner: 55 dB |
| Weight | Winner: Winner: 87 lbs | Not available |
| Run time @50% load | Not available | Winner: Winner: 8 h |
| Run time @25% load | 10 h | Not available |
| Fuel tank | 1.8 gal | 1.32 gal |
| Fuel gauge | No | No |
| Approx. dimensions (L × W × H) | 23.2 x 17.8 x 17.9 | Not available |
| Electrical | ||
| Voltage (AC) | 120 | 120V |
| Voltage (DC) | 12 | 12V |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | 3 % | Not available |
| Engine | ||
| Engine | 193 cc Firman Max-Pro Series OHV 4-Stroke, Cast Iron Sleeve | 149cc 4-stroke OHV engine |
| Alternator | Not available | Not available |
| Starting system | Recoil | Not available |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3300 W | 3200 W |
| Starting watts | 3650 W | 4000 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 | 10 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA | EPA compliant |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | Floating | Not available |
| UPC | 840876133811 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3300 | 3200 |
| Starting Watts (Gasoline) | 3650 | 4000 |
| Runtime @ 25% Load (Gasoline) | 10 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R) | One 20A outlet, one L5-30R Twist-Lock receptacle |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-Stroke | 4-stroke OHV |
| Engine Displacement | 193 | 149 |
| Cylinder Sleeve | Cast iron sleeve | Not available |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 10 | Not available |
| Controls & display | ||
| Display Type | Not available | Intelligent gauge |
| Idle Control System | Not available | Economic mode |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | No |
| Carbon Monoxide Monitoring | No | No |
| Included equipment | ||
| Starting Components | Recoil | Not available |
| Included Accessories | Oil, funnel, tool kit, and battery charging cables | Oil funnel * 2; A bottle of Oil; Spark plug wrench |
| Warranty & identification | ||
| Residential Warranty | Not available | 2 |
| Commercial Warranty | 3 | Not available |
| Part Number | Not available | SKU AI4000s |
| Additional specs | ||
| Summary | The Firman W03381 is a 3300-watt inverter generator built around a 193cc OHV 4-stroke engine with a cast iron sleeve. This wattage puts it in the mid-range portable segment, capable of powering a refrigerator, microwave, and several household circuits simultaneously, or running a single large tool on a job site. The 3650-watt starting capacity handles the inrush demand of compressors and air conditioning units. Because the W03381 runs on gasoline with a 1.8-gallon tank, users will find a 10-hour runtime at 25% load, which translates to roughly 2.5 hours of continuous full-load operation before refueling becomes necessary. The inverter topology and 3% THD output mean sensitive electronics like laptops, phones, and televisions receive stable, clean power without risk of damage. At 58 decibels, this generator operates at a volume comparable to normal conversation, making it suitable for residential neighborhoods and RV parks where noise restrictions apply. | The Aceup Energy AI4000DS is a 3200 watt rated gasoline generator with a peak output of 4000 watts, featuring a 149cc 4-stroke OHV engine and EPA compliance. |
- Most PowerfulFirman W033813300W running
- QuietestAceup Energy AI4000DS55 dB
- Longest RuntimeAceup Energy AI4000DS8h at 50% load
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Firman W03381
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Aceup Energy AI4000DS
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