Zoom on the Firman WH03662OF
In summary, the Firman WH03662OF is a portable inverter generator especially useful for:
- RV travellers wishing to enhance their freedom and nomad lifestyle
- People occasionally participating in sporting competitions, open-air performances and outdoor festivals
- Homeowners in need of an emergency backup power for their essentials
- Tailgating and campground aficionados with the desire of enjoying power anywhere they go
Power & Run Time
The dual-fuel technology of the Firman WH03662OF allows for an output of 120V and provides superb power and versatility. If gasoline-powered, the device provides a running wattage of 3650W and a starting wattage of 4500W. If propane-powered, it gives 3300 rated watts and 4100 starting watts. Additionally, as the generator is parallel capable (parallel kit not included), it can be linked to a second unit for more power.
At a noise rating of 69 dBA (less noisy than a normal conversation), this inverter generator can be started via a conventional pull-start mechanism, or a convenient and easy-to-use electric starter (battery included).
With a fuel capacity of 6 gallons, the WH03662OF can operate for up to 25 hours using gasoline (fuel consumption around 0.24 GPH), or for up to 19 hours (on a 20 lbs tank - propane consumption around 0.25 GPH) using propane.
The WH03662OF produces a clean sine wave: thanks to a <3% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.
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 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 WH03662OF 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. The device has been designed for tough environments and demanding outdoor use.
Even though this device may be technically portable (as in movable), manipulation and transportation without special equipment can be a challenge, as it weighs 119 pounds. 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 WH03662OF's status and activity, its control panel is equipped with a convenient meter, which displays voltage, frequency and lifetime hours.
In addition to this info, several light indicators serve to show you when the oil level is too low, the generator is overloaded and the generator is ready.
The inverter generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.
As for its security measures, the device features an overload protection (circuit breaker) and an automatic low oil shut-off, letting you use it with a peace of mind.
The WH03662OF 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 WH03662OF also is packed along with the following accessories: oil, tool kit, propane hose, RV adapter, funnel and battery charging cables.
The Firman WH03662OF 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, which makes it suitable for use in forested areas.
The unit also meets the ANSI/PGMA G300-2018 safety and performance requirements.
The Firman WH03662OF versus other generators
The following charts are provided to give you an idea of how some of the key specs of the Firman WH03662OF compare to inverter generators of similar power (between 3500 and 4500 W).
- A weight of 119 lbs makes the Firman WH03662OF one of the heavier inverters in the 3500-4500 rated wattage range. 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.
- Among the generators of a comparable running wattage, this inverter generator with a lowest noise of 69 dBA can be judged as noisy. If you are concerned with noise, check out the Cummins Onan P4500i, which is one of the least noisy generators in its power range, with a noise rating of just 52 dBA.
- Thanks to an impressive running time of up to 25 hours at 25% load, the WH03662OF benefits from one of the highest run times among inverter generators of a similar output.
- The run time is important, but also hugely depends on the capacity of the fuel tank and doesn't mean much if we don't talk about fuel consumption as well. In fact, this inverter generator is not among the most fuel efficient, within the aforementioned wattage range : its estimated gasoline consumption at 25% load is around 0.24 GPH. If fuel consumption is your top priority, we suggest to check out the Champion 200994, which has a fuel consumption of only 0.16 GPH and thus, is one of the most efficient devices in our database.
As you can see from this interactive chart, when compared to other 3500-4500W dual fuel inverter generators, the Firman WH03662OF 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
- Electric start
- Parallel capable
- Dual Fuel
- High run time
- No 240V output
- No remote start
- On the heavy side (119 lbs)
- On the noisy side (69 dBA)
- Low fuel efficiency
Features and Specifications
|Parallel capable||Yes, cable not included|
|Fuel||Dual Fuel (gasoline/propane)|
|Engine||208 cc OHV 4-stroke|
|Starting system||Recoil, Electric|
|Voltage||AC: 120V 60 Hz, DC: 12V|
|Running watts||3650 W||3300 W|
|Starting watts||4500 W||4100 W|
|Running amps||30.4 amps||27.5 amps|
|Peak amps||37.5 amps||34.2 amps|
|Run time @50% load||Unknown||Unknown|
|Run time @25% load||25 h||19 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|
|Compliance||CARB, EPA, ANSI/PGMA G300-2018|
|Security||Low oil and overload protection, CO monitoring|
|Accessories included||Oil, funnel, tool kit, propane hose, RV adapter, battery charging cables, battery, 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 WH03662OF 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||AC (10,000 BTU)||1500||2200|
|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|
|Total||2910 W||4010 W|
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