Gas + Manual start
Dual fuel + Electric start
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'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.
The control panel provides the upcoming 4 AC outlets:
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.
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.
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.
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.
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|
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||Refrigerator (energy star)||192||1192|
|Cell phone charger||20||20|
|Total||2912 W||3912 W|
|For camping||Radiant heater||1300||1300|
|RV AC (11,000 BTU)||1010||1600|
|Cell phone charger||20||20|
|Total||2910 W||3500 W|
|Total||2910 W||4010 W|
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