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.
- Honda EM4000SX
- Cat RP3600
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 | Honda EM4000SX | Cat RP3600 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | No | Yes |
| Running watts | 3500 W | Winner: Winner: 3600 W |
| Starting watts | 4000 W | Winner: Winner: 4500 W |
| Noise (lower limit) | Winner: Winner: 71 dB | 0 dB |
| Weight | 201 lbs | Winner: Winner: 125 lbs |
| Run time @50% load | Winner: Winner: 16 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 6.2 gal | 4.5 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 41.1 x 27.8 x 28.3 | 28.4 x 25.2 x 23 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120V 60 Hz |
| Voltage (DC) | 12 | Not available |
| GFCI outlets | Yes | No |
| Covered outlets | No | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | Not available |
| Engine | ||
| Engine | Honda iGX270 OHV 4-stroke, cast iron sleeve | 212 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3500 W | 3600 W |
| Starting watts | 4000 W | 4500 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 | 16 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | false | false |
| Compliance | CARB, EPA | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | true |
| UPC | 786102005265 | 815683020005 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3500 | 3600 |
| Starting Watts (Gasoline) | 4000 | 4500 |
| Runtime @ 50% Load (Gasoline) | 16 | 13.5 |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R) GFCI1x 120V 30A (L5-30R)1x 120/240V 20A (L14-20R) | 2x Duplex 120V 20A (5-20R) 1x 120V 30A (TT-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Engine Displacement | 270 | 212 |
| Cylinder Sleeve | cast iron sleeve | Not available |
| Engine Oil Type | Not available | SAE 30 or 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 16 | 13.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Included equipment | ||
| Starting Components | Not available | Oil, funnel, tool kit, and wheel kit |
| Included Accessories | Battery and wheel kit | Oil, funnel, tool kit, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | EM4000SXAT1 | 502-3684 |
| Additional specs | ||
| Summary | The Honda EM4000SX is a 4000-watt portable generator featuring a Honda iGX270 engine, electric start, and a 6.2-gallon fuel tank, providing extended run times and reliable power for various applications. | The Cat RP3600 is a 3600-watt gasoline generator built for job sites and RV camping. Its 4500-watt peak output handles startup surges for power tools and air conditioners, while the 3600-watt running capacity sustains multiple household circuits or a single large appliance continuously. |
- Most PowerfulCat RP36003600W running
- QuietestHonda EM4000SX71 dB
- Longest RuntimeHonda EM4000SX16h at 50% load
Where to buy
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Honda EM4000SX
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Cat RP3600
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