FIRMAN · Inverter generator
W03663OF
4,200 starting watts and 3,650 running watts with gasoline operation.
$799.99
$1,199.99
Direct price snapshot
Visual spec gallery
Core specifications, simplified.
Up to 4,200 starting watts
4,200W starting
Manufacturer runtime
Up to 22 Hrs
Operating volume
58dB @ 1/4 load
Fuel tank
6 Gal
116 Lbs
Unit weight
24.5" x 24.1" x 23"
Unit dimensions
- Warranty
- 3-year warranty
- Certifications
- CARB · CETL · EPA
- Availability
- Available
Starting
Electric, Recoil
Power quality
3% THD
Safety
Low-oil shutdown · CO Alert
Electrical
120 · 60
1 × 5-20R 120V 20A DUPLEX · 1 × L5-30R 120V 30A TWISTLOCK · 1 × �14-50R 120V/240V 50A (15.2A/120V/3650W) · 1 × USB-A (2.1A/5V DC/10W)
Official product gallery
Product views and FIRMAN infographics.
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Complete specifications
Every official field, organized.
The technical fields below come from FIRMAN’s model-specific specification file. Product photos and infographics come from the official product gallery. Confirm current documentation before purchase.
Manufacturer overview
The FIRMAN W03663OF is a 4500-watt remote start generator that's not just a machine—it's a statement of power for weekend warriors, home project conquerors, and tailgating champions. Packing a punch with 4500 starting watts and 3650 running watts, this portable dynamo weighs only 116lbs and boasts a 6-gallon tank for up to 23 hours of uninterrupted power at 25% load. Fueled by the Max Pro Series 208cc engine, it runs cool at a quiet 64dBs, providing the energy you need without the unnecessary roar. Eco-conscious with an eco mode button and the ability to parallel with any other FIRMAN inverter, it's a force to be reckoned with. Safety is paramount, featuring a CO Alert carbon monoxide shutdown, ensuring peace of mind. Whether you're an RV enthusiast, camping pro, tailgating virtuoso, or a DIY guru, the W03663OF is your go-to companion. Backed by a legendary FIRMAN 3-year warranty, with everything you need right in the box—oil, funnel, 12V battery cable, operator's manual, and spark plug wrench. Unleash the power, conquer the weekend, and make the W03663OF your undisputed choice for ultimate performance.
Specifications · Certifications
- CARB Certified
- Yes
- EPA Certified
- Yes
- cETL Certified
- Yes
- NOM Certified
- No
- UL Certified
- No
Specifications · Output
- Running Watts
- 3650
- Starting Watts
- 4500
- AC Voltage
- 120
- Frequency (Hertz)
- 60
- Decibels
- 58dB @ 1/4 load
- Run Time
- Up to 22 Hrs
- THD @ Full Load
- 3%
Specifications · Control Panel
- Remote Start
- Yes
- Electric Start
- Yes
- Recoil Start
- Yes
- 5-20R 120V 20A DUPLEX
- 1
- L5-30R 120V 30A TWISTLOCK
- 1
- �14-50R 120V/240V 50A (15.2A/120V/3650W)
- 1
- USB-A (2.1A/5V DC/10W)
- 1
- 12V DC Power Port/Plug (8.3A/12V DC/100W)
- 1
- CO Alert
- Yes
Specifications · Machine
- Low Oil Shutoff
- Yes
- Power Stream Alternator
- Yes
- Cast Iron Sleeve
- Yes
Specifications · Fuel System
- Fuel
- Gas
- Tank Size
- 6 Gal
- Steel/Plastic
- Steel Gas Tank
Specifications · Wheel Kit
- Wheels
- 9" Never Flat Wheels
- Handle
- U shape folding handle
Packaging · Unit
- UPC
- 840876136638
- Unit Dimensions
- 24.5" x 24.1" x 23"
- Unit Length
- 24.5"
- Unit Width
- 24.1"
- Unit Height
- 23"
- Unit Weight
- 116 Lbs
Packaging · Carton
- Carton Dimensions
- 28.7" x 21.1" x 21.3"
- Carton Length
- 28.7"
- Carton Width
- 21.1"
- Carton Height
- 21.3"
- Carton Weight
- 120.0 Lbs
Best-fit uses
- Camping
- Home Projects
- Power Outage
- Tailgate
- Work
Standout features
- Inverter power
- CO Alert shutdown protection
- Electric, Recoil start
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