WE ARE PROUD TO BE INDEPENDENT AND IN NO WAY ASSOCIATED WITH MANUFACTURERS. TO STAY UNBIASED, WE DO NOT ACCEPT FREE PRODUCTS. WE EARN FROM ADVERTISING FEES PAID BY HOME DEPOT ON QUALIFYING PURCHASES.

Firman W03661OF - 3650/4500W Open Frame Inverter Generator

The Firman W03661OF is a portable open frame inverter generator with a rated wattage of 3,650 W and a starting wattage of 4,500 W.

CompareShortlistShortlistedRemoved from shortlist 0

Firman W03661OFFirman W03661OFFirman W03661OFFirman W03661OF
Set Price Alert
×
Notify me when the price drops
Set an alert for the Firman W03661OF - Current lowest price: $1,209.99

Description

Zoom on the Firman W03661OF

In a nutshell, the Firman W03661OF is a portable inverter generator mostly geared towards:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in outdoor fairs, festivals or events
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Firman W03661OF in use

The Firman W03661OF

The Firman W03661OF's design includes a gasoline-fueled 208 cc OHV 4-stroke engine. With a 120V output, it gives a running wattage of 3650W and also a peak wattage of 4500W. In addition, as it is parallel capable (parallel kit not included), this power can be increased when linked to another similar or compatible unit.

At a noise rating of 69 dBA (less noisy than an office), the inverter generator is started via a simple traditional pull-start mechanism.

The W03661OF can operate for up to 25 hours with a full tank (fuel consumption around 0.24 GPH), due to its fuel capacity of 6 gallons.

The W03661OF generates a clean sine wave: providing <3% Total Harmonic Distortion (THD), delicate electronics can be plugged in its AC outlets safely.

Outlets

The control panel provides the upcoming 4 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (L5-30R) receptacle
120V 50A (14-50R) receptacle

It also sports 3 DC outlets: there's two 5V USB ports (USB-A) with which charging of electronics like mobile phones and tablets is made convenient and a 12V 8A (cigarette lighter style) receptacle with which charging your batteries is made easy.

If you own an RV with a 50-amp service, you can consider this Firman unit as RV-ready, as it features a 14-50R outlet. Its L5-30R receptacle can also be used for a simple RV connection with the included L5-30P to TT-30R adaptor.

Important note: The 14-50R outlet is normally 120/240V. However, this unit does not produce 240V. This outlet is here for your convenience, but should only be used to power 120V appliances. In addition, since the generator provides a maximum of 3650 running watts, it will not be possible to draw the full 50 amps from the outlet.

Portability

With its dimensions of L24.5 x W24.1 x H23 in, the conventional, open frame design of the Firman W03661OF offers stability and allows the generator to be raised above ground level. The featured design is ideal for the outdoors and all tough environments.

Since the generator weighs 106 lbs, it will be incredibly difficult to manually lift it and transport it, even though it is technically considered to 'be portable' (in the sense that it is movable). However, its challenging mobility is solved by its set of wheels (⌀9") and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Firman W03661OF

The W03661OF's control panel

The W03661OF and its control panel include a convenient meter, which displays voltage, frequency and lifetime hours. This feature comes handy when monitoring its status and activity.

In addition to this info, some light indicators allow you to instantly see if its oil levels are insufficient, the generator is ready and the generator is on overload.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the inverter generator.

As far as security is concerned, the generator can be used with a peace of mind, as it features an automatic low oil shut-off and an overload protection (circuit breaker).

The W03661OF also benefits from Firman’s CO Alert carbon monoxide shutdown, which automatically shuts down the engine when harmful levels of carbon monoxide accumulate around the generator or a CO Alert fault occurs. It’s a welcomed additional security feature, but don’t forget to always take your generator outside (opens in a new tab).

Apart from the typical documentation and an owner's manual (opens in a new tab), which lets you start it right away, the Firman W03661OF also is packed along with the following accessories: RV adapter, oil, funnel, tool kit and battery charging cables.

Emissions

The Firman W03661OF is EPA-approved and CARB-compliant. Thus, selling and purchasing this generator is allowed in each of the 50 states, including California.

Moreover, it features a spark arrestor and thus, may be used in forested areas.

The Firman W03661OF versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Firman W03661OF compare to inverter generators of similar power (between 3500 and 4500 W).

  • With a dry weight of 106 pounds, the Firman W03661OF finds itself in the expected weight range for inverter generators able to produce between 3500 and 4500 rated watts. If you are concerned by weight, one of the champions in the above-mentioned power range is the WEN GN400i, with a dry weight of just 66.1 pounds.
  • This inverter generator, with its lowest possible noise rated at 69 dBA falls into the more noisy category, compared to other devices of a similar running wattage. If noise emissions are important to you, one of the least noisy generators of this power range is the Westinghouse iGen4500DF with only 52 dBA.
  • The W03661OF provides one of the highest run time among similarly powerful inverters, reaching up to 25 hours at 25% load.
  • Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. Compared to its peers, this inverter generator is not exactly fuel efficient, compared to similarly powerful devices, with an estimated fuel consumption of 0.24 GPH at a 25% load. If not satisfied with the afore-mentioned fuel consumption, you may wish to check out the Champion 200988. With a fuel consumption of as little as 0.16 GPH, it is one of the most efficient generators currently on the market.

Price comparison

As you can see from this interactive chart, when compared to other 3500-4500W inverter generators, the Firman W03661OF is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • CO Alert technology
  • Several accessories included
  • RV adapter included
  • Parallel capable
  • Inverter
  • High run time
AVERAGE SPECS:
  • Decent weight (106 lbs)
WEAKNESSES:
  • No 240V output
  • No electric start
  • On the noisy side (69 dBA)
  • Low fuel efficiency

Do you own the Firman W03661OF and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
PortableYes
Parallel capableYes, cable not included
RV readyNo
FuelGasoline
Engine208 cc OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120V 60 Hz, DC: 12V
Running watts3,650 W
Starting watts4,500 W
Running amps30.4 amps
Peak amps37.5 amps
Run time @50% loadUnknown
Run time @25% load25 h
Features
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
  • 1x 120V 50A (14-50R)
DC outlets2x 5V USB port (USB-A)
1x 12V 8A (cigarette lighter style)
Data centerVFT
IndicatorsLow oil, overload and output ready
Fuel tankSteel, 6 gal
Fuel gaugeYes
Misc
Weight106 lbs
Approx. dimensions (L x W x H)24.5 x 24.1 x 23 in
Noise (lower limit)69 dBA
THD< 3%
ComplianceCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit
Warranty3 years
SeriesWhisper
UPC840876136614

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

×

This form does not send us any personal data (not even your IP address)

About FIRMAN Power Equipment

Founded in 1999, Firman Power Equipment is a company with a short, but established history in the power equipment industry. Based in Arizona, the company offers an immense range of products, including power tools, automotive equipment, storage utilities, work wear, but most importantly, a wide selection of generators of all sizes, designs and outputs. Interestingly, Firman is a wholly owned subsidiary of the China National Machinery Industry Corporation - a somewhat well renowned company in China and acts as a de facto distributor of their products in the US.

Warranty Information

The Firman W03661OF is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Firman generators, please consult Firman's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-844-FIRMAN1 (844-347-6261).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizing calculator.
ItemRunning WattsStarting Watts
At homeRefrigerator (energy star)1921192
Hair dryer18001900
Washing machine9001650
Cell phone charger2020
Total2912 W3912 W
For campingRadiant heater13001300
RV refrigerator180600
RV AC (11,000 BTU)10101600
Blender400850
Cell phone charger2020
Total2910 W3500 W
For workGrinder14002500
Demolition hammer12601260
Drain cleaner250250
Total2910 W4010 W

Couldn't find the right answer for you? Ask your own question.

Your name and email address will not be publicly published. We only need them to be able to answer you directly

We would love to know your opinion

Leave a review

Your total score

Generator Bible
Logo
Compare items
  • Total (0)
Compare

You can compare as many generators as you wish. However, for the best results, we recommend you to compare only 2 generators at a time.

0