Simpson: A Brand Built for the Job Site
Simpson is a power equipment brand focused on portable and job-site generators. Their lineup is built around open-frame, gasoline-powered units designed to handle the demands of contractors, tradespeople, and operators who need reliable output under sustained load. Simpson generators prioritize durability and wattage over quiet operation, making them a practical choice when production matters more than noise.
Open-Frame vs. Enclosed Generators
Simpson focuses on open-frame designs. Open-frame generators expose the engine, alternator, and frame directly, which simplifies maintenance and keeps weight lower for a given output level. Enclosed or inverter-enclosed designs prioritize noise reduction and portability, but they sacrifice cooling airflow in sustained-load conditions. For job-site use where the generator runs for hours at a time, open-frame construction is the practical choice. If quiet operation is the priority, consider an inverter model such as the Simpson PowerShot inverter generators in this collection.
Wattage Tiers: Which Output Level Do You Need?
Simpson generators in this collection range from 2200W to 8500W. A 2200W inverter model handles sensitive electronics, small appliances, and CPAP devices. A 3600W portable covers a job-site with circular saws, drills, and lighting running simultaneously. A 5500W model adds the capacity for a compressor or multiple large tools. An 8500W industrial unit supports full job-site loads including air compressors, welders, and multiple power tools at once. Match your wattage tier to the highest combined running-watt load you expect to draw.
Job-Site Use vs. Home Backup
Most Simpson models carry job-site tags and are built for contractor-grade duty cycles. That same durability translates well to home backup use during outages. Higher-output models in the 5500W to 8500W range can power refrigerators, lights, a sump pump, and window AC units simultaneously. For dedicated home backup with extended runtime and quieter operation, you may also want to compare inverter models in the lineup. Contractors who want one generator that serves both the job site and the home during storm season often find the 5500W to 7500W range is the right balance.
Fuel Type: Gasoline Only
All Simpson generators in this collection run on gasoline. Gasoline is widely available, which makes refueling straightforward on any job site or during a storm. Use fresh fuel and add a fuel stabilizer if the generator will sit unused for more than 30 days. Storing the generator with stale fuel in the carburetor is the leading cause of hard-starting problems. Drain the carburetor or run the engine dry before seasonal storage.
Starting Watts vs. Running Watts
Every motor-driven tool and appliance draws a surge of power when it starts, called starting watts or peak watts. Once running, it settles to a lower continuous draw, called running watts. The generator's rated or running wattage is what it sustains continuously. Its peak or starting wattage is what it can deliver briefly for motor startup. When sizing a generator, add up the running watts of everything you plan to run at the same time, then account for the largest single startup surge. The generator's peak wattage must exceed that surge.
Key Features to Look For
CO monitor and automatic shutoff is a critical safety feature on any portable generator. The Simpson PowerShot 5500W with CO Monitor shuts the engine down if carbon monoxide builds to dangerous levels near the unit. Electric start is available on several models and eliminates the physical effort of pull-starting a large engine after a long day on the job. GFCI outlets provide ground-fault protection for tools and equipment. Low-oil shutdown protects the engine if oil drops below a safe level during operation. Check each product page for the specific features included on the model you are considering.
Why Buy from Mighty Generators
Mighty Generators is an authorized Simpson dealer. That means every unit ships with full factory warranty coverage, not a third-party promise. Orders over $250 ship free within the contiguous US. No restocking fees, no fine print. The team is available Monday through Friday 8am to 6pm ET at (706) 701-8552 for sizing help, spec questions, or post-purchase support. If you are not sure which Simpson model fits your load, call before you order.
