Description
Simpson SPG3640 Overview
The Simpson SPG3640 is a gasoline portable generator rated at 4,500 starting watts and 3,600 running watts, driven by a 224cc CRX 225 engine. It is meant to cover a wide spread of uses, from tailgating and camping to charging tools on a jobsite and keeping key circuits running at home during an outage. That output is enough to handle everyday appliances, RV equipment and demanding power tools.
A welded steel roll cage surrounds the engine and alternator to guard them against knocks in rough settings, and the whole unit weighs 95 pounds with a footprint of 23 x 17 x 17 inches, so it stays manageable to move and store. Fuel comes from a 3.96-gallon tank that lasts about 10.5 hours at a quarter load or 8 hours at half load. The control panel combines GFCI-protected receptacles with a TT-30R outlet, letting a travel trailer or camper plug straight in, and a sensor stops the engine automatically if the oil runs low. The unit is listed as 49-state compliant and carries a 3-year consumer and 6-month commercial warranty. For long storage periods, adding fuel stabilizer to the tank helps keep ethanol-blended gasoline from breaking down and clogging the carburetor.
Key Features
- 4,500 starting watts and 3,600 running watts from the 224cc CRX 225 engine.
- Automatic low-oil shutdown sensor that protects the engine from damage.
- 3.96-gallon tank with roughly 10.5 hours of run time at 25% load.
- TT-30R 30A RV receptacle for a direct connection to a camper.
- Additional L5-30R 30A twist-lock and 5-20R 20A duplex outlets, with GFCI protection on the outlets.
- Heavy-duty welded steel roll cage that shields the engine and alternator from impact.
- Compact 95-pound build for easier transport and storage.
Who It’s For
Suited to RV owners and campers who want a TT-30R hookup, tailgaters, and tradespeople who need to run or charge tools on site. It also fits homeowners planning modest backup power for essentials during storms, provided they live in one of the 49 states the unit is certified for.
Specifications
| Brand | SIMPSON |
| Model | SPG3640 |
| Running Watts | 3,600 Watts |
| Starting Watts | 4,500 Watts |
| Engine | CRX® 225 (224cc) w/ Low Oil Shutdown |
| Fuel Tank Capacity | 3.96 Gallons |
| Run Time @ 25% Load | 10.5 Hours |
| Run Time @ 50% Load | 8.0 Hours |
| Outlets | (1) 120V 30A RV (TT-30R), (1) 120V 30A Twist Lock (L5-30R), (1) 120V 20A Duplex (5-20R) |
| Dimensions (L x W x H) | 23″ x 17″ x 17″ |
| Product Weight | 95 lbs |
| Warranty | 3 Year Consumer / 6 Month Commercial |
Buying advice: read our guide to the generator wattage chart, or compare all portable generators.
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