Gas + Manual start
Dual fuel + Electric start
Zoom on the Firman W03661OF
In summary, the Firman W03661OF is a portable inverter generator especially useful for:
- RV travellers who wish to upgrade their experience to another level
- People occasionally participating in sporting competitions, open-air performances and outdoor festivals
- Homeowners in need of an emergency backup power for their essentials
- Camping and tailgating buffs looking to enhance their experience
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's design includes a gasoline-fueled 208 cc OHV 4-stroke engine. With a 120V output, it gives a running wattage of 3,650W and also a peak wattage of 4,500W. Moreover, since it is parallel capable (parallel kit not included), its power may be increased if linked to a second compatible unit.
Enjoying a noise rating of 69 dBA (less noisy than an office), this inverter generator gets running thanks to a simple traditional pull-start mechanism.
The fuel capacity of 6 gallons allows the W03661OF to operate for up to 25 hours with a full tank (fuel consumption around 0.24 GPH).
As the W03661OF produces a clean sine wave, with a <3% Total Harmonic Distortion (THD), sensitive electronics may be plugged in the AC outlets safely.
The control panel features the following 4 AC outlets:
Furthermore, it has 3 DC outlets: there's two 5V USB ports (USB-A) with which you may charge electronics, for example mobile phones or tablets, conveniently and a 12V 8A (cigarette lighter style) receptacle with which you may charge your batteries with ease.
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.
The Firman W03661OF has a conventional, open frame design, of the following dimensions: L24.5 x W24.1 x H23 in, which offers support and allows it to be raised above ground level. This type of design is ideal for tough environments and heavy outdoor use.
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). Still, once it is on the ground, its set of wheels (⌀9") and its folding handle can easily solve the issue of low mobility and allow for easy relocation of the device.
To help you monitor the W03661OF's status and activity, its control panel is equipped with a convenient meter showing you voltage, frequency and lifetime hours.
In addition to this info, when the generator is ready, the oil level is too low and the generator is overloaded, you will be informed by the featured light indicators.
The inverter generator allows for a quick, easy and convenient assessment of its gas level, as it is equipped with a built-in fuel gauge.
Security-wise, this product benefits from an overload protection (circuit breaker) and an automatic low oil shut-off, which gives you a complete peace of mind when using it.
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.
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: battery charging cables, funnel, tool kit, RV adapter and oil.
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 therefore, can 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).
- Since the generator weighs in at a dry weight of 106 lbs, the Firman W03661OF belongs in the expected weight range for inverters which can produce between 3500 and 4500 rated watts. Regarding dry weight, one of the champions in the same power range is the WEN GN400i, with a dry weight of only 66.1 lbs.
- If compared to generators capable of producing a similar running wattage, this inverter generator with a lowest emitted noise of 69 dBA can be considered somewhat noisy. If you are concerned with noise, check out the Westinghouse iGen4500DF, which is one of the least noisy generators in its power range, with a noise rating of just 52 dBA.
- As the W03661OF features an autonomy of up to 25 hours at 25% load, it has one of the highest run times in comparison to the other inverter generators of its power range.
- 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 you wish to acquire one of the most gasoline efficient products of this power range, the Champion 200988, with a fuel consumption of 0.16 GPH could be in your good books.
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
- In the expected price range
- CO Alert technology
- Several accessories included
- RV adapter included
- Parallel capable
- High run time
- Decent weight (106 lbs)
- No 240V output
- No electric start
- On the noisy side (69 dBA)
- Low fuel efficiency
Features and Specifications
|Parallel capable||Yes, cable not included|
|Engine||208 cc OHV 4-stroke|
|Voltage||AC: 120V 60 Hz, DC: 12V|
|Running watts||3,650 W|
|Starting watts||4,500 W|
|Running amps||30.4 amps|
|Peak amps||37.5 amps|
|Run time @50% load||Unknown|
|Run time @25% load||25 h|
|Automatic Voltage Regulation||Inverter|
|AC outlets|| |
|DC outlets||2x 5V USB port (USB-A) |
1x 12V 8A (cigarette lighter style)
|Indicators||Low oil, overload and output ready|
|Fuel tank||Steel, 6 gal|
|Approx. dimensions (L x W x H)||24.5 x 24.1 x 23 in|
|Noise (lower limit)||69 dBA|
|Security||Low oil and overload protection, CO monitoring|
|Accessories included||Oil, funnel, tool kit, RV adapter, battery charging cables, and wheel kit|
|Country of origin||China|
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.
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.
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?
|Item||Running Watts||Starting Watts|
|At home||Electric fry pan||1500||1500|
|Refrigerator (energy star)||192||1192|
|Total||2917 W||3917 W|
|For camping||RV AC (11,000 BTU)||1010||1600|
|Set of 5 LED light bulbs||55||55|
|Cell phone charger||20||20|
|Total||2915 W||3505 W|
|Electric fence (25 miles)||250||250|
|Total||2910 W||4010 W|
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