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

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. (Read full specs)

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Firman WH03662OFFirman WH03662OFFirman WH03662OFFirman WH03662OF
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Price history for the Firman WH03662OF
Latest updates:
  • $1,079.00 - December 23, 2023
  • $1,116.21 - November 27, 2023
Data source: homedepot.com
Since: November 27, 2023
  • Highest Price: $1,116.21 - November 27, 2023
  • Lowest Price: $1,079.00 - December 23, 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 able to use the most necessary devices in their household, even during a blackout
  • Camping and tailgating hobbyists looking for a portable power source

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device.

Power & Run Time

The Firman WH03662OF in use

The Firman WH03662OF

The Firman WH03662OF, equipped with dual-fuel technology and delivering 120V, ensures both power and versatility. Running on gasoline, it delivers a running wattage of 3,650W and a starting wattage of 4,500W. On propane, it provides 3,300 running watts and 4,100 starting watts. In addition, the device is parallel capable (parallel kit not included) and thus, can be linked to a similar or compatible unit for added power.

Featuring a noise rating of 69 dBA (less noisy than background music), the inverter generator is equipped with both a conventional pull-start mechanism and a user-friendly and efficient electric starter (battery included) for starting.

The WH03662OF, with a fuel capacity of 6 gallons, reaches a run time of up to 25 hours utilizing gasoline (fuel consumption around 0.24 GPH). Alternatively, it can reach a run time of up to 19 hours (on a 20 lbs tank - propane consumption around 0.25 GPH) with propane.

The WH03662OF produces a clean sine wave: thanks to a <3% Total Harmonic Distortion (THD), your sensitive electronics can be safely plugged in the AC outlets.

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

Additionally, it features 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 providing easy battery charging capabilities.

If your RV requires a 50-amp service, consider this Firman unit RV-ready, as it includes a 14-50R outlet.

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

At L24.5 x W24.1 x H23 in, the standard open frame design of the Firman WH03662OF delivers stability alongside easy maintenance access to components and good air cooling. The design is ideal for rough environments and demanding outdoor use.

While weighing 119 lbs, the generator is classified as 'portable,' indicating its mobility, albeit its heftiness may limit portability in specific situations. Despite the restricted maneuverability, its set of wheels (⌀9") and its folding handle provides a solution, allowing for convenient shifting once the generator is positioned on the ground.

Features

Panel of the Firman WH03662OF

The WH03662OF's control panel

The WH03662OF's status and activity may be monitored conveniently via the control panel, as it features a convenient meter, which displays 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 inclusion of a built-in fuel gauge in the inverter generator streamlines gas level checks for quick and convenient assessments.

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 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.

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, RV adapter, propane hose, funnel, battery charging cables and tool kit.

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).

  • Considering its dry weight of 119 pounds, the Firman WH03662OF is one of the heavier inverter generators producing between 3500 and 4500 running watts. if you wish to prioritize weight, the Genmax GM4600iAEFIC is one of the top contenders in its power category, weighing only 58.4 pounds.
  • When compared to other units producing a similar running wattage, this inverter generator and its lowest emitted noise of 69 dBA stand out for being on the louder side. If you value reduced noise levels, the Westinghouse iGen4500DF could be worth considering. It's one of the quietest generators in its power range, rated at 52 dBA.
  • Compared to inverters of similar power, the WH03662OF stands out with one of the highest run times, lasting up to 25 hours at 25% load.
  • Run times are important, yet thanks to their dependence on the fuel capacity, they should be judged along with the fuel consumption of the device. In terms of fuel efficiency within its wattage range, this inverter generator falls short: it consumes approximately 0.24 GPH at a 25% load. To prioritize fuel savings, we advise considering the Champion 200988, which stands out for its gasoline efficiency, consuming just 0.16 gallons per hour.

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 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
  • Dual Fuel
  • CO Alert technology
  • Several accessories included
  • RV adapter included
  • Electric start
  • Parallel capable
  • Inverter
  • High run time
WEAKNESSES:
  • No 240V output
  • No remote start
  • On the heavy side (119 lbs)
  • 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 G300-2023
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 sizer.
ItemRunning WattsStarting Watts
At homeDish washer15003000
Refrigerator (energy star)1921192
Vacuum cleaner10751175
Laptop150150
Total2917 W4417 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric grill16501650
Set of 5 LED light bulbs5555
Cell phone charger2020
Total2915 W3505 W
For workGrinder14002500
Demolition hammer12601260
Drain cleaner250250
Total2910 W4010 W

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