Most jobsite power problems are not about peak wattage -- they are about a generator that runs out of fuel before lunch or trips every time a motor starts. The Simpson PowerShot SPG3640 is sized for the middle of that range: 3,600 running watts with 4,500 starting watts, enough surge headroom for the inductive loads that stall an undersized unit, and a run time measured in a full shift rather than a couple of hours.
The 224cc Simpson OHV engine drives it, with low oil shutdown to protect the engine when someone forgets to check it. A 3.96 gallon tank gives roughly 8 hours at 50 percent load and about 10.5 hours at 25 percent, which is what makes it practical for a work day, an event, or a power outage without a midday refuel stop. GFCI protection and a full roll cage cover the two things that actually go wrong on a jobsite: ground faults and getting knocked over in the back of a truck.
Use Cases
- Jobsite power for hand tools, work lights, and small compressors on remote or unpowered sites
- Pressure washing and cleaning contractors running equipment away from a building outlet
- RV and campsite power through the dedicated 120V TT-30R receptacle
- Home backup during outages for a refrigerator, sump pump, lights, and electronics
- Events, tailgating, and outdoor work where a quiet, portable power source is needed
Outlets and what they are for
The panel carries a 120V TT-30R RV receptacle, a 120V 5-20R duplex, and a 120V L5-30R twist lock. The TT-30R plugs an RV in directly. The twist lock is the connection you want for a transfer switch or a locking extension cord that cannot vibrate loose. The duplex handles everyday tools and cords. Sizing note: check the starting wattage of your largest motor load, not just its running wattage, since that surge is what determines whether a generator can carry it.
Specifications
- Running watts: 3,600
- Starting watts: 4,500
- Engine: Simpson OHV 224cc with low oil shutdown
- Fuel: gasoline, 3.96 gallon tank
- Run time: about 8 hours at 50 percent load, about 10.5 hours at 25 percent load
- Receptacles: one 120V TT-30R RV, one 120V 5-20R duplex, one 120V L5-30R twist lock
- Protection: GFCI protected outlets, roll cage frame
- Dimensions: 23 inch L x 17 inch W x 17 inch H
- Weight: 95 lbs
- Compliance: 49-state compliant
- Model: SPG3640, part number 70062
Frequently asked questions
What can a 3,600 watt generator run?
Typically a combination of hand tools, work lights, a small compressor, and electronics, or during an outage a refrigerator, sump pump, and lighting. Add up the running watts of everything you plan to run at once and confirm the largest motor's starting surge fits within the 4,500 starting watts.
How long does it run on a tank?
About 8 hours at 50 percent load and about 10.5 hours at 25 percent load on its 3.96 gallon tank.
Can I plug an RV into it?
Yes. It has a dedicated 120V TT-30R receptacle, which is the standard 30-amp RV connection.
What is the difference between running and starting watts?
Running watts is the continuous load a generator sustains. Starting watts is the brief surge it can supply when a motor spins up. Motors can draw two to three times their running wattage at startup, so the surge rating is what decides whether the generator can carry them.
What is low oil shutdown?
A sensor that stops the engine when oil drops below a safe level, preventing the engine damage that follows running an air-cooled engine low or dry.
Is it safe to run indoors or in a garage?
No. Gasoline generators produce carbon monoxide and must be run outdoors, well away from doors, windows, and vents, never in a garage, basement, or enclosed space.
Discount Cleaning Products is an authorized dealer, and every order is backed by US-based product support from people who work with this equipment every day. Call or email us for sizing, compatibility, or bulk questions before you buy.
