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Firman P03603 - 3650 Watt Gas Portable Generator

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Equipped with a powerful 208cc engine producing 3,650 watts of running power, the Firman P03603 is ready to take on your tasks with ease and confidence. Engineered for professionals and homeowners alike, this gas portable generator can handle multiple jobs including powering heavy-duty power tools and household appliances.

The portable generator's 4,550 watts can run at half power for up to 14 hours while exhibiting exceptional fuel efficiency. On a full 5-gallon tank, the P03603 promises hours of runtime to ensure you finish tasks on the job site and continue working through power outages and heavy weather.

The P03603 is RV-ready and can power your RV without an extra converter thanks to its three outlets, one of which is a TT-30R receptacle that can be used with a variety of recreational vehicles.

Since it complies with Environmental Protection Agency standards for reduced air pollution, this backup option is safe and healthful.

Note: This product cannot be shipped to California. It is not CARB compliant.

Key Firman P03603 Features:

  • 208cc Engine: The powerful Firman 208cc engine can provide 3,650 watts of continuous running power to all of your high-amperage power tools and household appliances at the press of a button or by using the remote control.
  • 14+ Hours of Runtime: This gas portable generator can power your home or workspace for more than 14 hours on a single tank of gas, making it ideal for use during natural disasters or power outages.
  • Sleek Build: The P03603's sleek design cannot be denied; it has the company's characteristic accent while staying understated, making it an attractive accent piece.
  • EPA-Certified: This 4,550-watt portable generator has been certified by the Environmental Protection Agency for meeting their strict safety standards for emissions and other environmental impacts.



  • Peak Watts: 4,550
  • Running Watts: 3,650
  • Peak Amps @120V: 37.9
  • Running Amps @120V: 30.4


  • Amperage: 30.4A
  • Voltage: AC: 120V 60 Hz
  • Frequency: 60Hz
  • Engine Size: 208cc
  • Engine Type: OHV 4-stroke
  • Engine Speed: 3600RPM
  • Fuel Type: Gasoline
  • Fuel Tank Capacity: 5 Gallons


  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (TT-30R)
  • 1x 120V 30A (L5-30R)


  • Runtime at 50% Load: 14 Hours
  • Start Type: Electric Start/Remote/Recoil
  • Volume Level: 67dB
  • EPA-Certified: Yes
  • CARB-Certified: No
  • Product Dimensions: 24.8"L x 21.7" W x 121.7" H
  • Product Weight: 128 Lbs

Consistency in Action

This sturdy, performance-tuned 208cc Firman engine generates 3,650 watts of running power, which is more than enough to operate small and large appliances as well as heavy-duty power equipment with ease.

In addition, the Firman P03603 is equipped with an automated voltage regulator to handle power spikes, since they can leave the unit damaged, and protecting it from sudden spikes in electricity use is crucial.

Freedom and Autonomy

The 4,550-watt portable generator has a maximum operating time of 14 hours on a single tank of gasoline. With its 5-gallon fuel capacity, the P03603 allows you to focus on your immediate needs and get things done.

This high-powered unit notifies you when it needs more oil and shuts down on its own if the supply gets too low, protecting itself from potentially harmful contaminated oil.


To protect your safety at all times, the Firman P03603 strictly adheres to environmental rules that control harmful emissions.

This portable generator is safe and reliable since it complies with EPA rules and emits far less hazardous gases and particles.

Since the P03603 lacks CARB approval, it cannot be sold or purchased in California.

Fully Loaded Power Panel

The P03603's many power points make it useful in a number of situations, such as power outages and construction sites.

Moreover, the gadget has circuit breakers that instantly shut down the engine to avoid damage from overloads.

Furthermore, the unit's spark arrestor makes it safe for use in forested areas.

You can see the full range of Firman generators we sell here. Always reach out to our team if you have any questions about any of them.