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WEN DF480iX vs FlexPower 4500ies Quiet Inverter Generator with Electric Start

Buy the WEN DF480iX if you want dual-fuel flexibility, more running watts and a lower price. Buy the FlexPower 4500ies if you want a slightly larger RV outlet count and a marginally higher owner rating. The WEN is $647.00 at Amazon as of November 5, 2026; the FlexPower is $849.00 at FactoryPure as of November 5, 2026. That is a $202 gap for a machine that runs on gasoline only.

Today the WEN DF480iX costs $202.00 less at its best price.

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WEN
WEN DF480iX

WEN DF480iX

4.7· 97 ratings
$647.00at AmazonObserved at 11:42 AM
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Choose the WEN DF480iX if you want to run on propane as well as gasoline, need 4000 running watts, and want to spend about $200 less.

Pros
  • Runs on gasoline or propane, so a 20 lb tank gives 12 hours at half load
  • 4000 running watts and 4800 peak on gasoline beat the FlexPower
  • CO shutdown sensor and low-oil shutdown are both included
  • Electric start with recoil backup, wheels and telescoping handle
  • $647.00 at Amazon as of November 5, 2026, about $200 under the FlexPower
Cons
  • Small 1.9-gallon tank means frequent refills on gasoline
  • 62 dB is measured at quarter load, so it gets louder under load
  • Only 120V output, no 240V for well pumps or dryers
  • Propane cuts output to 3600 running watts
FlexPower
FlexPower 4500ies Quiet Inverter Generator with Electric Start

FlexPower 4500ies Quiet Inverter Generator with Electric Start

4.8· 44 ratings
$849.00at FactoryPureObserved at 11:35 AM
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Choose the FlexPower 4500ies if gasoline-only is fine and you want a 4500-watt peak unit with a 4.8 rating from 44 owners.

Pros
  • 4.8 out of 5 from 44 ratings
  • 4500 peak watts from a 224cc OHV engine
  • Eco-mode throttles down to save fuel at light loads
  • Parallel ready for pairing with a second unit
  • Telescoping handle and wheels for moving an 82 lb unit
Cons
  • Gasoline only, no propane option
  • 3600 running watts is 400 fewer than the WEN on gasoline
  • No CO shutdown sensor listed
  • $849.00 at FactoryPure as of November 5, 2026, $202 more than the WEN

What separates them

WEN DF480iXFlexPower 4500ies Quiet Inverter Generator with Electric Start
FuelGasoline or propane, tool-free LPG quick-connectGasoline only
Running watts4000 on gasoline, 3600 on propane3600
Peak watts4800 on gasoline, 4320 on propane4500
RuntimeUp to 7 hours at half load on 1.9 gallons; 12 hours on a 20 lb propane tankNot published; 7 L (1.85 gal) tank
Outlets4x 120V, 1x TT-30R RV, 1x 12V DC, 2x USB4x 120V, 1x 30A RV
CO shutdownWatchdog CO sensor shuts the unit offNot listed
Weight78.5 lb82 lb
Price$647.00 at Amazon as of November 5, 2026$849.00 at FactoryPure as of November 5, 2026

Price history

$849.00$647.00
Nov 1Nov 5
  • WEN DF480iX: lowest $647.00 on Nov 1 at Amazon; $647.00 on Nov 5.
  • FlexPower 4500ies Quiet Inverter Generator with Electric Start: lowest $849.00 on Nov 2 at Flex Power; $849.00 on Nov 5.

Prices at every store

WEN DF480iX

  • Home DepotNew

    In stock

    $647.00Free shippingObserved at 11:33 AM
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  • eBayNew

    In stockSold by wen_products

    $749.99Free shippingObserved at 11:36 AM
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  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $647.00Free shippingObserved at 11:42 AM
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  • Lowe'sNew

    Availability unknown

    $647.00Free shippingObserved at 11:33 AM
    Visit store

Also available at

  • WEN ProductsCheck price at WEN Products
  • eBayCheck price at eBay
  • Northern ToolCheck price at Northern Tool
All 7 stores and price history →

FlexPower 4500ies Quiet Inverter Generator with Electric Start

  • Flex PowerNew

    In stockReturn policy

    $849.00Observed at 11:42 AM
    Visit store
  • Camping WorldNew

    In stock

    $859.00Free shippingObserved at 11:35 AM
    Visit store
  • RVMPNew

    In stock

    $999.00+ $9.90 shippingObserved at 11:35 AM
    Visit store
  • FactoryPureNew

    Availability unknown

    $849.00Free shippingObserved at 11:35 AM
    Visit store

Also available at

  • Flex PowerCheck price at Flex Power
All 4 stores and price history →

Specs compared

SpecWEN DF480iXFlexPower 4500ies Quiet Inverter Generator with Electric Start
Engine displacement224cc224cc
Voltage120 volts120V
Inverter TechnologyYesYes
Continuous Output4000 rated watts (gasoline)3600 W
Power Output4800-Watt3600 W
Peak Output4800 surge watts (gasoline)4500 W
Starting MethodElectric startElectric start
ProtectionOverload protectionOverload indicators
Fuel TypeGasoline, Dual Fuel, PropaneGasoline
Fuel Capacity1.9-gallon7 L
Number Of Outlets4 (three-prong 120V receptacles)5 (4 AC 120V, 1 30A RV Receptacle)
Receptacle TypeTT-30R30A RV Receptacle
Show all 38 specsShow fewer specs
SpecWEN DF480iXFlexPower 4500ies Quiet Inverter Generator with Electric Start
Weight78.5 lbs82.00 lb
Depth24"23.81 in
Height22.1 in22.04 in
Width12.6 in12.59 in
Noise Level62 decibels (at quarter load)<63 Decibels
Gasoline surge watts4800 surge watts—
Gasoline rated watts4000 rated watts—
Propane surge watts4320 surge watts—
Propane rated watts3600 rated watts—

What reviewers say

WEN DF480iX

  • 4.7 / 597 ratings

With 4.7 out of 5 from 97 ratings, owners generally report it starts easily, runs quietly and handles RV and home backup loads well. Dual-fuel flexibility and the CO shutdown are recurring points of praise.

Pros
  • Quiet running compared with conventional generators
  • Reliable electric start
  • Propane option extends runtime and avoids stale gas
  • Clean power for electronics
Cons
  • Heavy for one person to move
  • Short gasoline runtime at higher loads
  • Propane reduces available wattage

FlexPower 4500ies Quiet Inverter Generator with Electric Start

  • 4.8 / 544 ratings

Rated 4.8 out of 5 from 44 ratings, owners mostly praise the quiet running and easy electric start. The common complaints center on weight and fuel stops.

Pros
  • Very quiet at camp, even under load
  • Electric start fires up reliably
  • RV outlet works with a standard 30A cord
  • Eco-mode stretches fuel on light loads
Cons
  • Heavy to move without help
  • Small tank runs dry quickly with big loads
  • No remote start

Questions and answers

Which is better for running an RV air conditioner?
The WEN has 4000 running watts on gasoline against 3600 for the FlexPower, so it has more headroom for a 13,500 BTU RV air conditioner plus other loads. Both have a 30A RV receptacle.
Is the WEN worth it over the FlexPower?
Yes for most buyers. It costs $202 less at the prices above, makes 400 more running watts and adds propane. The FlexPower's case is its 4.8 rating and parallel-ready design.
Which runs longer on a tank?
The WEN is rated up to 7 hours at half load on 1.9 gallons. FlexPower does not publish a runtime figure for its 7 L tank, so the WEN is the safer bet on paper.
Can either one run on propane?
Only the WEN. It makes 3600 running and 4320 peak watts on propane through a tool-free quick-connect. The FlexPower is gasoline only.
Which is quieter?
The WEN is rated 62 dB at quarter load; the FlexPower is listed under 63 dB. The gap is small, and both get louder as load rises.
Which is easier to move?
The WEN weighs 78.5 lb and the FlexPower 82 lb. Both have wheels and a telescoping handle, so the 3.5 lb difference is minor.

More comparisons

  • WEN DF480iX vs WEN Super Quiet 4000-Watt RV-Ready Electric Start Portable Inverter Generator with Fuel Shut-Off and CO Watchdog (56400iX)
  • 3800W Gas/Propane Dual Fuel Inverter Generator w/ CO Alert HB5040DC vs WEN DF480iX
  • BILT HARD 5500W Dual Fuel Inverter Generator vs WEN DF480iX
  • Pulsar 5000-Watt Dual Fuel RV Ready Inverter Generator with Remote Start and CO Sentry vs WEN DF480iX
  • FlexPower 4500ies Quiet Inverter Generator with Electric Start vs WEN Super Quiet 4500-Watt Electric Start Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut-Off (DF451i)
  • WEN DF480iX vs GENMAX GM4000iSBEPC 3200W/4000W 26.7 Amp Electric Start Gas Inverter Generator Parallel Ready with CO Detect
  • FlexPower 4500ies Quiet Inverter Generator with Electric Start vs Generac IQ3500 3000/3500w Ultra Quiet Electric Start Inverter Generator
  • WEN DF480iX vs WEN Super Quiet 4500-Watt Electric Start Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut-Off (DF451i)

Buying guides that pick them

  • Best 4000-watt inverter generators with electric start
  • Best dual fuel inverter generators
  • Best 4000W inverter generators with electric start
Fuel tank capacity
1.9-gallon
—
Runtime gasolineup to 7 hours of half-load run time—
Runtime propane12 hours half-load run time on a 20-pound LPG t…—
Runtime7 hours (half-load, 1.9-gallon tank)—
CO SensorYes—
Low Oil ShutdownYes—
Overload ProtectionYes—
Automatic Shut OffYes (Fuel shut-off), Yes (CO Shutdown Sensor)—
Fuel GaugeYes—
Typical UsersRV enthusiasts, Camping, Hunting, RV-Ready, Tai…—
Efficiency—Eco-mode for energy saving
Frequency—60Hz
Connectivity Ports—30A RV receptacle
Auto Idle Control—Eco-mode for energy saving
Electric Start—Yes
Recoil Start—Yes
Engine Type—OHV