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Firman WH03662OF - 3650/4500W Dual Fuel Open Frame Inverter Generator

The Firman WH03662OF is a portable open frame dual fuel inverter generator with a rated wattage of 3,650 W and a starting wattage of 4,500 W.

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Firman WH03662OFFirman WH03662OFFirman WH03662OFFirman WH03662OF
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Price History
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Price history for the Firman WH03662OF
Latest updates:
  • $1,079.00 - December 23, 2023
  • $1,116.21 - November 27, 2023
  • $1,079.00 - May 4, 2023
Data source: homedepot.com
Since: May 4, 2023
  • Highest Price: $1,116.21 - November 27, 2023
  • Lowest Price: $1,079.00 - May 4, 2023

Description

Zoom on the Firman WH03662OF

In a nutshell, the Firman WH03662OF 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 sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • 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 WH03662OF in use

The Firman WH03662OF

Thanks to its dual-fuel technology, the Firman WH03662OF delivers 120V and offers power and versatility. When gasoline-powered, it benefits from a running wattage of 3,650W and a peak wattage of 4,500W. When propane-powered, it has 3,300 rated watts and 4,100 peak watts. 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 a normal conversation), this inverter generator can be started thanks to a conventional pull-start mechanism, but also to a convenient and easy-to-use electric starter (battery included).

Regarding its running time, the WH03662OF, with a 6 gallons fuel capacity can operate for up to 25 hours with a full tank of gasoline (fuel consumption around 0.24 GPH). When using propane, it can run for up to 19 hours (on a 20 lbs tank - propane consumption around 0.25 GPH).

Delicate electronics can be plugged in an AC outlets safely, as the WH03662OF generates a clean sine wave, reaching a <3% Total Harmonic Distortion (THD).

Outlets

The control panel includes the following 4 AC outlets:

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

Furthermore, it has 3 DC outlets: there's two 5V USB ports (USB-A) allowing you to conveniently charge electronics such as mobile phones and tablets 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.

Portability

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 generator is designed for ideal use outdoors and in rough environments.

While the generator is considered to be technically 'portable' (in the sense that you can move it), manually lifting and transporting it may be challenging, due to its high weight of 119 lbs. Nevertheless, thanks to its set of wheels (⌀9") and its folding handle (a decent solution to its lack of maneuverability), the generator can be easily moved, once placed the ground.

Features

Panel of the Firman WH03662OF

The WH03662OF's control panel

The WH03662OF's control center features a convenient meter showing you voltage, frequency and lifetime hours to aid you with the monitoring of its status and activity.

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.

From a security point of view, the generator is equipped with an automatic low oil shut-off and an overload protection (circuit breaker), giving you a peace of mind during use.

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.

With the basic documentation and an owner's manual (opens in a new tab), letting you start the generator quickly, the Firman WH03662OF also comes with several accessories, including: propane hose, funnel, RV adapter, battery charging cables, oil and tool kit.

Emissions

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, so it is adequate 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).

  • Since the generator weighs in at a dry weight of 119 lbs, the Firman WH03662OF belongs in the expected weight range for inverters which can 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 Genmax GM4600iAEFIC, with a dry weight of just 58.4 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 Westinghouse iGen4500DF, which is one of the least noisy generators in its power range, with a noise rating of just 52 dBA.
  • As the WH03662OF 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.
  • Even though run times are undoubtedly important, they are dependent on the fuel capacity to a large extent. For a more wholesome picture, we must take into consideration the fuel consumption of the generator. 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 are concerned with gasoline efficiency, having a fuel consumption of just 0.16 GPH, the Champion 200988 is a device you could look out for.

Price comparison

As you can see from these interactive charts, when compared to other 3500-4500W dual fuel inverter generators, the Firman WH03662OF is on the expensive side of the price range.

While certainly not the cheapest of its kind, purchasing it would most likely also mean enjoying the reliability of a high-end product.

The bottom line

STRENGTHS:
  • Dual Fuel
  • CO Alert technology
  • Several accessories included
  • RV adapter included
  • Electric start
  • Parallel capable
  • Inverter
  • High run time
AVERAGE SPECS:
  • Decent weight (119 lbs)
WEAKNESSES:
  • On the expensive side
  • No 240V output
  • No remote start
  • On the noisy side (69 dBA)
  • Low fuel efficiency

Do you own the Firman WH03662OF and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
Parallel capableYes, cable not included
RV readyNo
FuelDual Fuel (gasoline/propane)
Engine208 cc OHV 4-stroke
Starting systemRecoil, Electric
Warranty3 years
VoltageAC: 120V 60 Hz, DC: 12V
Power
GasolinePropane
Running watts3,650 W3,300 W
Starting watts4,500 W4,100 W
Running amps30.4 amps27.5 amps
Peak amps37.5 amps34.2 amps
Run time @50% loadUnknownUnknown
Run time @25% load25 h19 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
Weight119 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, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, tool kit, propane hose, RV adapter, battery charging cables, battery, and wheel kit
Country of originChina
SeriesWhisper, Hybrid
UPC840876136621

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.

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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 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?
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 size 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
Electric fence (25 miles)250250
Total2910 W4010 W

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