Generator entity · Inverter (portable)
Firman WT05571 Tri Fuel Inverter
Tri-fuel inverter with the fullest outlet panel in this index: 5,500 W running / 6,850 W starting on gasoline (5,000 W propane, 4,500 W natural gas running), 120/240 V with TT-30R, L14-30R, AND 14-50R, CO Alert shutdown, PGMA G300-2023 and CSA certified — 59.6 kg.
Machine summary · generator · firman-wt05571
- brand
- Firman
- model_name
- WT05571 (Whisper Series Tri Fuel Inverter)
- generator_type
- inverter_portable
- fuel
- gasoline+propane+natural_gas
- running_watts
- 5500
- starting_watts
- 6850
- voltage
- 120/240V
- co_shutdown
- present
- rv_outlet_present
- true
- weight_kg
- 59.6
- confidence_level
- medium
- source_last_checked
- 2026-07-08
- json_export
- /generators/firman-wt05571.json
Overview
Firman's WT05571 is the rare tri-fuel inverter: gasoline, propane, or natural gas through a digital inverter, with per-fuel running watts published for all three (5,500 / 5,000 / 4,500 W). Its natural-gas STARTING watts conflict between Firman's own sources (page 5,500 vs manual 5,600) and are stored as unresolved. The panel is the most complete here: a manual-designated TT-30R RV receptacle, L14-30R and 14-50R for 240 V work, a GFCI 5-20R duplex, 60 W USB-C, and 12 V DC. CO Alert shuts the engine down on CO buildup (Firman's manual explicitly says it does not replace CO alarms), with PGMA G300-2023 and CSA C22.2 No. 100-14 conformance stated. THD is null: the manual's spec table appears to transpose power factor and THD, so no clean numeric exists. Runtime is 14.5 h at 1/4 load — fuel unlabeled by Firman but implied gasoline (the 5.3 gal onboard tank), flagged accordingly.
Variant note: WT05571F refurbished variant excluded. Firman's T07571 (7,500 W tri-fuel conventional) was REJECTED from this index on the CO-shutdown gate — no CO Alert documented. Related CO Alert models: T07573, WT06073, T06373.
Data note: NG starting-watts conflict (page 5,500 vs manual 5,600) left unresolved: startingWattsByFuel omits natural_gas, both values preserved in provenance. THD null: manual prints 'Power Factor: <3%' and 'THD: 1' — apparently transposed; no clean official numeric exists. The 14.5 h @ 1/4 load runtime lacks an explicit fuel label (implied gasoline onboard tank) — runtimeByFuelAndLoad left null, headline field kept with the caveat. Noise (67 dB @ 1/4 load) lacks a distance basis. Weight (131.4 lb = 59.6 kg) not explicitly labeled dry. Overload behavior per manual: warning above ~5,710 W; receptacle cutoff in 10 s above ~5,950 W, 2 s above ~6,050 W. Two units parallel to 11,000 W total.
Specifications
Running and starting watts are never collapsed; every runtime figure carries its fuel and load basis; THD is shown only when officially stated numerically. Core values' original claims and sources are in the provenance table. The final group is computed from the fields above and marked as derived.
| Attribute | Value |
|---|---|
| Running (rated) watts | 5,500 W |
| Starting (peak) watts | 6,850 W |
| Running watts by fuel | Gasoline: 5,500 W · Propane (LPG): 5,000 W · Natural gas: 4,500 W |
| Starting watts by fuel | Gasoline: 6,850 W · Propane (LPG): 6,250 W |
| Voltage | 120/240V |
| Frequency | 60Hz |
| Total harmonic distortion | Not numerically stated |
| 240V support | Yes |
| Attribute | Value |
|---|---|
| Fuel | Gasoline + Propane (LPG) + Natural gas |
| Fuel tank (gasoline) | 5.3 gal |
| Runtime — Gasoline, 25% load | 14.5 h |
| Fuel notes | NG supply: 7–11 inches water column; consumption 19.8/39.9/78 ft³/h at no/half/full load. LPG consumption 0.8/3/5.3 lb/h. The 14.5 h @ 1/4 load runtime is not fuel-labeled by Firman (implied onboard gasoline tank; LPG/NG run from external supply). Economy Control (Eco Mode) reduces consumption and noise at light loads. Noise distance basis unpublished. |
| Attribute | Value |
|---|---|
| Engine displacement | 322 cc |
| Noise | 67 dBA (at 1/4 load) |
| Start method | recoil, electric |
| Parallel capable | Yes |
| Inverter technology | Yes |
| Attribute | Value |
|---|---|
| Receptacles | 2 × 5-20R (one duplex, 120V 20A GFCI), 1 × TT-30R (120V 30A RV (not GFCI protected), max 22.9A), 1 × L14-30R (120/240V 30A twist-lock (22.9A / 5,500 W)), 1 × 14-50R (120/240V (22.9A / 5,300 W single unit; 45.8A in parallel operation)), 1 × USB-C (PD 3.1, 60 W), 1 × 12V DC (8.3A / 100 W) |
| RV outlet (30A RV receptacle) | Yes |
| TT-30R present | Yes |
| L14-30R present | Yes |
| GFCI outlets | Yes |
| Covered outlets | Yes |
| Attribute | Value |
|---|---|
| CO shutdown | Automatic CO shutdown present (CO Alert) |
| Low-oil shutdown | Yes |
| Overload protection | Yes |
| EPA certified | Yes |
| CARB compliant | Yes |
| CSA/ETL listing | CSA C22.2 No. 100-14 |
| PGMA compliant | Yes |
| Attribute | Value |
|---|---|
| Weight (dry) | 59.6 kg (131.4 lb) |
| Dimensions (L × W × H) | 698.5 × 541 × 574 mm |
| Wheel kit included | Yes |
| Handle | fixed |
| Type | Inverter (portable) · Cart style |
| Attribute | Value |
|---|---|
| Watts per kg | 92.3 W/kg |
| Portability band | mid |
Use cases
- RV power via the manual-designated TT-30R with 5,500 W of inverter output
- Home backup with three fuel paths including household natural gas
- Transfer-switch setups via L14-30R / 14-50R at 240 V
- Long outages: NG supply removes tank limits entirely
Cross-category fit flags (stored for future battery-vs-generator pages, not yet used for ranking): RV suitable · camping not suitable · home backup suitable · apartment use: no · sensitive electronics: medium · noise class: moderate.
Strengths and weaknesses
Strengths
- Tri-fuel inverter — the only unit in this index combining both traits
- TT-30R, L14-30R, AND 14-50R on one panel
- CO Alert with PGMA G300-2023 and CSA C22.2 No. 100-14 conformance stated
- CARB and EPA emissions conformance stated in the manual
- 60 W USB-C and 12 V DC on board; 3-year warranty
Weaknesses
- Natural-gas starting watts conflict between Firman's own sources (5,500 vs 5,600) — stored unresolved
- THD unpublishable: the manual's spec table appears to transpose power factor and THD
- Runtime figure is not fuel-labeled by Firman
- 14-50R delivers only 22.9 A / 5,300 W from a single unit despite the 50 A receptacle form
- 59.6 kg — wheeled, not carried
Comparisons featuring this generator
High-Output Dual & Tri-Fuel Home-Backup Generators: DuroMax XP13000EH vs Westinghouse iGen11000TFc vs WGen9500DF vs Champion 201412 vs DuroMax XP9000iH vs Firman WT05571
Six high-output 120/240 V multi-fuel generators for whole-house backup through a transfer switch — 5,500–10,500 W running, dual- and tri-fuel, conventional and inverter. They separate on output, fuel flexibility, power quality (only the inverters offer clean THD), and one critical safety point: five have CO-shutdown, one documents that it does not.
RV-Ready Generators: WEN DF360iX vs Champion 201531 vs Westinghouse iGen5000DFc vs Firman WT05571 vs Honda EU2200i Companion
Five generators with genuine RV receptacle evidence — a TT-30R (or, for the Honda, a Honda-marketed L5-30R) on the panel, not just 'RV Ready' marketing. They span 1,800–5,500 W running, single- to tri-fuel, and 21.5–59.6 kg, all with documented CO-shutdown.
Where to buy
Merchant links are scaffolded but not yet active. When live, some will be affiliate links; merchant relationships never affect indexed specifications or verdicts.
- Official product page: https://firmanpowerequipment.com/products/wt05571
- Amazon: link pending — Affiliate link placeholder — not yet active
Sources and provenance
Core specifications — including all safety fields — come from official manufacturer sources only, with the exact claim text preserved per field. Safety-related fields carry the strictest rules: CO-shutdown status is never inferred from marketing. See the methodology for the full policy.
| Field | Normalized value | Raw claim | Source | Confidence |
|---|---|---|---|---|
runningWatts | 5500 | Running watts 5500W (GAS), 5000W (LPG), 4500W(NG) | Official product page — Manual spec table agrees: 'Running Watts* 5500(GASOLINE)/5000(LPG)/4500(NG)'. | high |
startingWatts | 6850 | Starting watts 6850W (GAS), 6250W (LPG), 5500(NG) | Official product page — Gasoline figure; manual agrees on GAS/LPG. | high |
runningWattsByFuel | {"gasoline":5500,"propane":5000,"natural_gas":4500} | Running Watts* 5500(GASOLINE)/5000(LPG)/4500(NG) | Official manual (PDF) — All three fuels numerically published; page identical. | high |
startingWattsByFuel | {"gasoline":6850,"propane":6250} | Starting Watts 6850(GASOLINE)/6250(LPG)/5600(NG) | Official manual (PDF) — CONFLICT on NG: manual 5,600 vs page 5,500 — NG omitted from the normalized map, both values preserved here per the conflict rule. | medium |
voltage | 120/240V | Rated AC Voltage 120/240V | Official manual (PDF) — Page: '120/240 AC Volts'. | high |
receptacleSummary | {"5-20R":2,"TT-30R":1,"L14-30R":1,"14-50R":1,"USB-C":1,"12V DC":1} | (1) 5-20R 120V 20A DUPLEX GFCI / (1) TT-30R 120V 30A TWISTLOCK / (1) L14-30R 120V/240V 30A TWISTLOCK (22.9A/240V/5500W) / (1) 14-50R 120V/240V 50A (22.9A/240V/5300W) / (1) USB-C (3.1/5A/5/9/12/15/20V DC/60W) / (1) 12V DC Power Port/Plug (8.3A/12V DC/100W) | Official product page — Manual confirms each receptacle by NEMA code; 14-50R limited to 22.9A single-unit (45.8A in parallel). | high |
rvOutletPresent | true | 9. 120V, 30A RV – NEMA TT-30R (not GFCI protected) | Official manual (PDF) — Manufacturer explicitly designates the TT-30R as the RV receptacle. | high |
fuelTankCapacityGal | 5.3 | Capacity Fuel Tank 5.3 U.S. Gallons (20L) | Official manual (PDF) | high |
runtimeAt25LoadHours | 14.5 | Up to 14.5 hours of run time at 1/4 load | Official product page — Load basis explicit; fuel NOT labeled by Firman (implied onboard gasoline tank, since LPG/NG use external supply) — runtimeByFuelAndLoad left null per policy. | medium |
noiseDb | {"quarter_load":67} | 67dB ¼ load | Official product page — Load basis stated; measurement distance not stated anywhere official. | medium |
totalHarmonicDistortion | — | Power Factor: <3% ... Total Harmonic Distortion(THD): 1 | Official manual (PDF) — Values appear transposed in the manual spec table (power factor 1 and THD <3% would be expected); no clean official numeric — null per policy, suitability capped at medium. | low |
coShutdown | present | CO Alert automatically shuts down the engine when harmful levels of carbon monoxide accumulate around the generator or a CO Alert fault occurs. | Official manual (PDF) — Manual section 'CO Alert(TM) Carbon Monoxide (CO) Shutdown System'; also warns 'CO Alert DOES NOT replace carbon monoxide alarms.' | high |
weightKg | 59.6 | Weight: 131.4 lbs | Official product page — 131.4 lb × 0.453592 = 59.6 kg; not explicitly labeled dry. | medium |
dimensionsMm | {"l":698.5,"w":541,"h":574} | measures 22.6"H x 21.3"D x 27.5"W, weighs 131.4 lbs. | Official product page — Converted ×25.4, mapped l=27.5"W, w=21.3"D, h=22.6"H from the page's H×D×W ordering. | medium |
engineSizeCc | 322 | 322cc FIRMAN engine | Official product page | high |
warrantyYears | 3 | FIRMAN Three (3) Year Limited Warranty | Official manual (PDF) — Separate 2-year federal/California emissions warranty also in manual. | high |
pgmaCompliant | true | complies with PGMA (Portable Generator Manufacturers' Association) standard ANSI/PGMA G300-2023, Safety and Performance of Portable Generators. | Official manual (PDF) — Same footnote cites CSA C22.2 No. 100-14 certification. | high |
carbCompliant | true | Designed, built, and equipped so as to conform with all applicable regulations adopted by the Air Resources Board and US EPA | Official manual (PDF) — From the manual's California/Federal emissions control warranty statement. | medium |
parallelCapable | true | two WT05571 units can be paralleled to 11000 W total | Official manual (PDF) — FIRMAN parallel kit required; 14-50R reaches 45.8A in parallel operation. | high |