Firman WT05571 - 5500/6850W Tri Fuel Inverter Generator With Electric Start
The Firman WT05571 is a portable tri-fuel inverter generator with a rated wattage of 5,500 W and a starting wattage of 6,850 W. (Read full specs)
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Description
Zoom on the Firman WT05571
In short, the Firman WT05571 is a portable inverter generator adequately designed for:
- RV travellers looking for even more independence
- Occasional participants of outdoor events, competitions, concerts and festivals
- Food truck owners who want to ensure that their business is fully self-contained and does not rely on potentially unreliable external power
- Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
- Professionals who want to be able to deliver results, even during a power failure
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 WT05571 delivers 120/240V and benefits from a tri-fuel technology that allows it to run on gasoline, propane, or natural gas. When gasoline-powered, it enjoys a running wattage of 5,500W and a peak wattage of 6,850W. When propane-powered, it benefits from 5,000 rated watts and 6,250 peak watts. Its natural gas operation offers 4,500W of rated wattage and 5,500W of starting wattage. Moreover, since it is parallel capable (parallel kit not included), its power may be increased if linked to a second compatible unit.
Featuring a noise rating of 67 dBA (less noisy than background music), the inverter generator is equipped with both a traditional recoil pull-start mechanism and a user-friendly and efficient electric starter (battery included) for starting.
As for its running time, the WT05571, along with its 5.3 gallons fuel capacity, can run for up to 14.5 hours with a full tank filled with gasoline (fuel consumption around 0.37 GPH). If propane is used, it can operate for up to 9.5 hours (estimation based on a 20 lbs tank - propane consumption around 0.49 GPH).
With a <3% Total Harmonic Distortion (THD), the WT05571 delivers a clean sine wave, essential for safeguarding your delicate electronics when plugged into its AC outlets.
Outlets
The control panel provides the upcoming 5 AC outlets:
Additionally, it features 2 DC outlets: there's a 12V 8A (cigarette lighter style) receptacle providing easy battery charging capabilities and a 5V USB port (USB-C) ensuring convenient charging of devices like mobile phones and tablets, for connectivity on the go.
With its TT-30R receptacle (TT as in 'Travel Trailer'), this Firman generator is RV Ready. In addition, thanks to its twist-lock L14-30R receptacle, the WT05571 is transfer switch ready, facilitating easy hookup to your breaker box to provide backup power for your home during blackouts.
Portability
Thanks to its closed inverter generator design (L27.6 x W21.3 x H22.6 in), the Firman WT05571 not only offers superior aesthetics but also operates with reduced noise levels compared to a typical, open frame generator. The generator has a contemporary design, convenient for recreationally generating power.
As the generator's weight is 131.4 pounds, manually moving it or transporting it may be challenging, despite the fact that it is technically considered 'portable' (movable). However, the limited maneuverability is remedied with its set of 2 wheels (⌀8") and its folding handle, facilitating convenient shifting once the generator is positioned on the ground.
Features
The WT05571's control panel is equipped with a digital data center, furnishing detailed information on the fuel level, lifetime run hours, voltage, power output, frequency and remaining run time for you to easily track its activity and status.
Security-wise, this product benefits from an automatic low oil shut-off and an overload protection (circuit breaker), which gives you a complete peace of mind when using it.
The WT05571 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 WT05571 also comes with several accessories, including: tool kit, funnel, oil and propane hose.
Product Video
The Firman WT05571 versus other generators
The following charts are provided to give you an idea of how some of the key specs of the Firman WT05571 compare to inverter generators of similar power (between 5000 and 6000 W).
- Since the generator weighs in at a dry weight of 131.4 lbs, the Firman WT05571 belongs in the expected weight range for inverters which can produce between 5000 and 6000 rated watts. If you are mindful of weight, the Pulsar PGX60BiSRCO is among the top contenders in this power range, with a dry weight of 93.5 pounds.
- When comparing it to devices with a similar running wattage, this inverter generator's lowest noise level of 67 dBA puts it alongside the noisier units. If you value reduced noise levels, the Honda EU7000iS could be worth considering. It's one of the quietest generators in its power range, rated at 52 dBA.
- At a 25% load, the WT05571 offers up to 14.5 hours of runtime on a full tank, placing it within the average autonomy range among inverter generators of similar power level. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Champion 201532, reaching up to 18 hours.
- While the run time is an important parameter, it is dependent on the fuel tank's capacity and thus, doesn't say much on its own unless we consider fuel consumption as well. Among generators of similar output, this inverter generator ranks somewhat poorly in fuel efficiency, with an estimated consumption of 0.37 GPH at a 25% load. If minimizing fuel usage is one of your key priorities, the DuroMax XP7000iHT is one of the most efficient devices with similar power output, with a gasoline consumption of only 0.19 gallons per hour.
Price comparison
As you can see from these interactive charts, when compared to other 5000-6000W multi-fuel generators, the Firman WT05571 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
- Tri-fuel
- CO Alert technology
- Several accessories included
- GFCI Outlets
- 4 different AC outlet types
- USB-C port
- RV Ready
- Electric start
- Parallel capable
- Inverter
- Decent weight (131.4 lbs)
- Decent run time
- On the expensive side
- Natural gas hose not included
- No remote start
- On the noisy side (67 dBA)
- Low fuel efficiency
Features and Specifications
| Inverter | Yes |
|---|---|
| Parallel capable | Yes, cable not included |
| RV ready | Yes |
| Fuel | Tri-Fuel (gasoline/propane/natural gas) |
| Engine | 322 cc OHV 4-stroke, cast iron sleeve |
| Starting system | Recoil, Electric |
| Warranty | 3 years |
| Voltage | AC: 120/240V 60 Hz, DC: 12V |
| Gasoline | LPG | NG | |
|---|---|---|---|
| Running watts | 5,500 W | 5,000 W | 4,500 W |
| Starting watts | 6,850 W | 6,250 W | 5,500 W |
| Running amps (@120/240V) | 45.8/22.9 amps | 41.7/20.8 amps | 37.5/18.8 amps |
| Peak amps (@120/240V) | 57.1/28.5 amps | 52.1/26 amps | 45.8/22.9 amps |
| Run time @50% load | Unknown | Unknown | N/A |
| Run time @25% load | 14.5 h | 9.5 h * | N/A |
| GFCI outlets | Yes |
|---|---|
| Covered outlets | Yes |
| Automatic Voltage Regulation | Inverter |
| AC outlets |
|
| DC outlets | 1x 12V 8A (cigarette lighter style) 1x 5V USB port (USB-C) |
| Data center | Power output, fuel level, lifetime run hours, remaining run time, voltage and frequency |
| Indicators | No |
| Fuel tank | Steel, 5.3 gal |
| Fuel gauge | Digital |
| Weight | 131.4 lbs |
|---|---|
| Approx. dimensions (L x W x H) | 27.6 x 21.3 x 22.6 in |
| Noise (lower limit) | 67 dBA |
| THD | < 3% |
| Compliance | EPA, ANSI/PGMA G300-2023 |
| Security | Low oil and overload protection, CO monitoring |
| Spark arrestor | Yes |
| Neutral | Bonded to frame |
| Accessories included | Oil, funnel, tool kit, propane hose, and battery |
| Country of origin | China |
| Series | Whisper |
| UPC | 840876155714 |
We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing or inaccurate information, feel free to suggest a correction so we can address it.
* Propane runtime is our own estimate, based on a 20 lbs tank and NIST 1994 GGE (Gasoline Gallon Equivalent) formula: 5.66 lbs of propane = 1 gal of gasoline.
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 WT05571 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 | Dish washer | 1500 | 3000 |
| AC (10,000 BTU) | 1500 | 2200 | |
| Sump pump (1/2 hp) | 1050 | 2150 | |
| Refrigerator (energy star) | 192 | 1192 | |
| Laptop | 150 | 150 | |
| Total | 4392 W | 5892 W | |
| For camping | RV AC (11,000 BTU) | 1010 | 1600 |
| RV refrigerator | 180 | 600 | |
| Hair dryer | 1800 | 1900 | |
| Radiant heater | 1300 | 1300 | |
| Radio | 100 | 100 | |
| Total | 4390 W | 4980 W | |
| For work | Table saw | 1800 | 4500 |
| Grinder | 1400 | 2500 | |
| Reciprocating saw | 730 | 960 | |
| Bug zapper | 80 | 80 | |
| Total | 4010 W | 6710 W |
Couldn't find the right answer for you? Ask your own question.



