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.
- Cummins Onan P4500i
- 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 | Cummins Onan P4500i | 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: 3700 W | 3200 W |
| Starting watts | Winner: Winner: 4500 W | 4000 W |
| Noise (lower limit) | Winner: Winner: 52 dB | 55 dB |
| Weight | Winner: Winner: 98 lbs | Not available |
| Run time @50% load | Winner: Winner: 15 h | 8 h |
| Run time @25% load | 18 h | Not available |
| Fuel tank | 3.4 gal | 1.32 gal |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 24.5 x 18.3 x 20.5 | Not available |
| Electrical | ||
| Voltage (AC) | 120 | 120V |
| Voltage (DC) | 5 | 12V |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | 3 % | Not available |
| Engine | ||
| Engine | 224 cc Ducar OHV 4-stroke | 149cc 4-stroke OHV engine |
| Alternator | Not available | Not available |
| Starting system | Recoil; Electric; Remote | Not available |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3700 W | 3200 W |
| Starting watts | 4500 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 | 15 h | Not available |
| Run time @25% load | 18 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 | 690781007925 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3700 | 3200 |
| Starting Watts (Gasoline) | 4500 | 4000 |
| Runtime @ 50% Load (Gasoline) | 15 | Not available |
| Runtime @ 25% Load (Gasoline) | 18 | 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 | Ducar OHV 4-stroke | 4-stroke OHV |
| Engine Displacement | 224 | 149 |
| Engine Oil Type | 10W30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 18 | Not available |
| Runtime @ 50% Load (Gasoline) | 15 | 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 | ||
| Included Accessories | Oil, funnel, tool kit, key fob, battery charger, and battery | Oil funnel * 2; A bottle of Oil; Spark plug wrench |
| Warranty & identification | ||
| Residential Warranty | Not available | 2 |
| Commercial Warranty | 3 | Not available |
| Part Number | A058U955 | SKU AI4000s |
| Additional specs | ||
| Summary | The Cummins Onan P4500i is a 3700-watt inverter generator built for users who need reliable power without the noise penalty. Its 4500-watt peak capacity handles startup surges for air conditioners, power tools, and RV air conditioning units. The gasoline engine runs clean enough for sensitive electronics like laptops and phones, thanks to a 3 percent THD rating that protects against voltage spikes. This unit bridges the gap between portable camping generators and stationary backup power, making it useful for RV owners, homeowners facing extended outages, and contractors working near occupied spaces. | 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 PowerfulCummins Onan P4500i3700W running
- QuietestCummins Onan P4500i52 dB
- Longest RuntimeCummins Onan P4500i15h at 50% load
Where to buy
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Cummins Onan P4500i
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Aceup Energy AI4000DS
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