Firman W03661OF Inverter 3650W/4500W 50 Amp Gas With CO AlertThis generator$569.00Black Friday price
FIRMANModel W03661OF
Firman W03661OF Inverter 3650W/4500W 50 Amp Gas
- Peak4,500W
- Running3,650W
- FuelGasoline
- Weight106 lb
Black Friday price
$569.00
Black Friday price ends in —
In stock Ships within 24 hours
Free delivery Thu, Nov 5 – Tue, Nov 10 if you order today, by UPS or FedEx Ground to your door.
- Free shipping48 states + DC
- 30-day returnsReturn shipping on us
- Full warrantyBrand-new, from the maker
- Secure checkoutEncrypted by Stripe
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Questions before you buy?
Our small team in Wilmington, NC answers every message personally.
Email [email protected]
The FIRMAN W03661OF features a 208cc engine for reliable, long-lasting power, as well as a cast-iron sleeve to increase engine life.
The FIRMAN W03661OF features a 208cc engine for reliable, long-lasting power, as well as a cast-iron sleeve to increase engine life. It has an impressive 3650 running watts and 4500 starting watts, and can run for up to 22 hours at 25% load due to its 6-gallon tank. The Eco Mode feature further conserves fuel usage for maximum efficiency. Additionally, it is easy to start with its recoil start system and features a low oil shut off for safety. All this power comes in a lightweight package, weighing only 106lbs, with noise levels of 67dB at ¼ load.
Run time on a full tank
25% load22 hrs
As published by the manufacturer. Real run time depends on load and fuel.
Full specifications
| Brand | FIRMAN |
|---|---|
| Model | W03661OF |
| Weight | 106 lb |
| UPC / GTIN | 00840876136614 |
How it shipsUPS or FedEx GroundTo your door, free
Order today, deliveredThu, Nov 5 – Tue, Nov 10Leaves our warehouse within 24 hours
Tracking is emailed as soon as it ships.
We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns
Brand-new, with the full manufacturer’s warranty. The terms are set by FIRMAN and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.
What it can run
3,650 W running, 4,500 W starting
Pick what you want to power at the same time.
Typical wattages – check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.
Compare similar generators
Same power class, side by side.
| Specification | Firman W03661OF Inverter 3650W/4500W 50 Amp Gas With CO AlertThis generator$569.00 |  Cummins Onan P4500i 3700W/4500W Remote Start Portable Gas Inverter Generator$729.00 |  Champion 201184 3500W/4500W Inverter Generator Gas RV and Parallel Ready CO Shield Remote Start$629.00 |
|---|---|---|---|
| Running watts | — | 3,700 W | 3,500 W |
| Starting watts | — | 4,500 W | 4,500 W |
| Fuel | — | Gasoline | Gasoline |
| Start | — | Remote and electric | Remote and electric |
| Safety | — | — | CO shutdown sensor |
| Link | You are here | View → | View → |
Firman W03661OF Inverter 3650W/4500W 50 Amp Gas With CO AlertThis generator$569.00Cummins Onan P4500i 3700W/4500W Remote Start Portable Gas Inverter Generator$729.00- Running watts
- 3,700 W
- Starting watts
- 4,500 W
- Fuel
- Gasoline
- Start
- Remote and electric
Champion 201184 3500W/4500W Inverter Generator Gas RV and Parallel Ready CO Shield Remote Start$629.00- Running watts
- 3,500 W
- Starting watts
- 4,500 W
- Fuel
- Gasoline
- Start
- Remote and electric
- Safety
- CO shutdown sensor
Questions and answers
Answered by our team in Wilmington. Can’t find yours? Ask below.
Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
How will it be delivered?
Free, by UPS or FedEx Ground to your door, usually within 2–5 business days after it ships. Tracking is emailed as soon as it ships.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
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