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
- DEWALT DXGNR4000
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 | DEWALT DXGNR4000 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | No |
| Parallel capable | Yes | No |
| RV ready | Yes | No |
| Running watts | 3700 W | Winner: Winner: 4000 W |
| Starting watts | 4500 W | Winner: Winner: 5000 W |
| Noise (lower limit) | Winner: Winner: 52 dB | 0 dB |
| Weight | Winner: Winner: 98 lbs | 119 lbs |
| Run time @50% load | Winner: Winner: 15 h | 10 h |
| Run time @25% load | 18 h | Not available |
| Fuel tank | 3.4 gal | 3.4 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 24.5 x 18.3 x 20.5 | 23.7 x 23 x 21.4 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 5 | Not available |
| GFCI outlets | No | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | Not available |
| Engine | ||
| Engine | 224 cc Ducar OHV 4-stroke | 223 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil; Electric; Remote | Recoil |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3700 W | 4000 W |
| Starting watts | 4500 W | 5000 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 | 10 h |
| Run time @25% load | 18 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | CARB, EPA | CARB |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | true |
| UPC | 690781007925 | 696471075809 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3700 | 4000 |
| Starting Watts (Gasoline) | 4500 | 5000 |
| Runtime @ 50% Load (Gasoline) | 15 | 10 |
| Runtime @ 25% Load (Gasoline) | 18 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R) | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Ducar OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 224 | 223 |
| Engine Oil Type | 10W30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 18 | Not available |
| Runtime @ 50% Load (Gasoline) | 15 | 10 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | No | Yes |
| Included equipment | ||
| Included Accessories | Oil, funnel, tool kit, key fob, battery charger, and battery | Oil, funnel, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | A058U955 | PMC164000 |
| 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 DEWALT DXGNR4000 is a 4000-watt gasoline generator built around a 223cc OHV 4-stroke engine. This wattage class sits at the threshold between household backup and light job site work. At 4000 running watts, it can power a refrigerator, sump pump, and several lights simultaneously during an outage, or run circular saws and air compressors on a construction site, but not both at full capacity. The 5000-watt peak handles motor startup surges, which matters when appliances draw 20 to 30 percent more current at the moment they turn on.
The DXGNR4000 targets users who need portability without sacrificing power. A 3.4-gallon fuel tank delivers 10 hours of runtime at half load, meaning a full tank gets you through a night of backup power or a full workday on site. The recoil start requires physical effort to fire up, but it eliminates the complexity and cost of electric ignition. DEWALT backs this unit with a three-year warranty, signaling confidence in the engine and electrical components. |
- Most PowerfulDEWALT DXGNR40004000W running
- QuietestCummins Onan P4500i52 dB
- Longest RuntimeCummins Onan P4500i15h at 50% load
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Cummins Onan P4500i
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DEWALT DXGNR4000
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