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Deal.ai › Compare

FlexPower 4500ies Inverter Generator vs WEN 56380i Inverter Generator

The FlexPower 4500ies is the stronger pick for RV owners and home backup: it delivers more running and surge power, has a larger tank, and owners describe it as quiet and capable. The WEN 56380i is the better value for lighter loads, with a lower noise rating at quarter load, USB and 12V ports, a digital fuel display, and a fuel shutoff that reduces carburetor maintenance. Both are inverter units with electric start and clean power; the FlexPower is heavier and has fewer owner ratings, while the WEN is heavier still and rated for less output.

  • Choose the FlexPower 4500ies if you need more running watts for an RV air conditioner or home backup and want a bigger fuel tank.
  • Choose the WEN 56380i if you want a quiet, feature-rich inverter with USB and 12V charging and easier carburetor upkeep for lighter loads.

Prices

  • FlexPower 4500ies Inverter Generator: $849.00 at Flex Power (checked today)
  • WEN 56380i Inverter Generator: $609.00 at OSIAS fuel systems (checked today)
  • Difference: the WEN 56380i Inverter Generator is $240.00 cheaper than the FlexPower 4500ies Inverter Generator today
FlexPower
FlexPower 4500ies Quiet Inverter Generator with Electric Start

FlexPower 4500ies Inverter Generator

FlexPower 4500ies Quiet Inverter Generator with Electric Start

4.8(44 ratings)
$849.00at Flex PowerChecked 4 h ago
See all prices and details
Visit Flex Power
Pros
  • More running and surge power than the WEN
  • Larger fuel tank for longer runs
  • Lighter at 82 lb with a telescoping handle and wheels
  • Electric start plus recoil backup
  • Parallel ready for extra capacity
Cons
  • Louder than the WEN at its rated figure
  • No USB or 12V DC charging ports
  • No fuel shutoff for carburetor care
  • Fewer owner ratings to judge long-term reliability
WEN
WEN 56380i Super Quiet 3800-Watt RV-Ready Portable Inverter Generator with Fuel Shut-Off and Electric Start

WEN 56380i Inverter Generator

WEN 56380i Super Quiet 3800-Watt RV-Ready Portable Inverter Generator with Fuel Shut-Off and Electric Start

4.5(125 ratings)
$609.00at OSIAS fuel systemsChecked 6 h ago
See all prices and details
Visit OSIAS fuel systems
Pros
  • Quieter at quarter load
  • Fuel shutoff helps prevent carburetor clogging
  • USB and 12V DC ports for charging devices
  • Digital load and fuel display
  • Clean power with low total harmonic distortion
Cons
  • Less running and surge power
  • Heavier at 99.2 lb
  • Smaller output margin for large RV air conditioners

What separates them

FlexPower 4500ies Inverter GeneratorWEN 56380i Inverter Generator
Running watts3600 W continuous3400 W rated
Surge watts4500 W peak3800 W surge
Fuel capacity7 L (about 1.85 gal)2.2 gal
NoiseUnder 63 dB57 dB at quarter load
Outlets4 AC 120V plus one 30A RV receptacle2 AC 120V, one TT-30R RV, one 12V DC, two USB
Weight82 lb99.2 lb
Fuel system careNo fuel shutoff listedFuel shutoff drains the carburetor
Owner feedback4.8 from 44 ratings4.5 from 125 ratings

Price history

$849.00$609.00
Nov 2Nov 12
  • FlexPower 4500ies Inverter Generator: lowest $849.00 on Nov 2 at Flex Power; $849.00 on Nov 10.
  • WEN 56380i Inverter Generator: lowest $609.00 on Nov 12 at OSIAS fuel systems.

Prices at every store

FlexPower 4500ies Inverter Generator

  • Flex PowerNew

    In stockReturn policy

    $849.00Checked 4 h ago
    Visit Flex Power
  • Camping WorldNew

    In stock

    $859.00Free shippingChecked Nov 10
    Visit Camping World
  • FactoryPureNew

    Availability unknown

    $849.00Checked Nov 5
    Visit FactoryPure
  • RVMPNew

    Availability unknown

    $999.00Checked Nov 5
    Visit RVMP

Also available at

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

WEN 56380i Inverter Generator

  • OSIAS fuel systemsNew

    In stock

    $609.00Free shippingChecked 6 h ago
    Visit OSIAS fuel systems
  • WEN ProductsNew

    In stock

    $699.99Free shippingChecked 4 h ago
    Visit WEN Products
  • ArborNew

    In stock

    $699.99+ $49.99 shippingChecked 6 h ago
    Visit Arbor
  • AmazonNew

    Availability unknown

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

    $699.99Free shippingChecked 6 h ago
    Visit Amazon

Also available at

  • WEN ProductsCheck price at WEN Products

Store links may earn us a commission.

All 7 stores and price history →

Specs compared

SpecFlexPower 4500ies Inverter GeneratorWEN 56380i Inverter Generator
Inverter TechnologyYesYes
Fuel TypeGasolineGasoline
Fuel Capacity7 L2.2-gallon
Continuous Output3600 W3400 rated watts
Power Output3600 W3800 surge watts
Voltage120V120V
Peak Output4500 W3800 surge watts
Starting MethodElectric startElectric start
EfficiencyEco-mode for energy savingMaximize fuel economy (by engaging the Eco-Mode…
Frequency60Hz50 Hz
ProtectionOverload indicatorsOverload protection
Number Of Outlets5 (4 AC 120V, 1 30A RV Receptacle)6
Show all 36 specsShow fewer specs
SpecFlexPower 4500ies Inverter GeneratorWEN 56380i Inverter Generator
Receptacle Type30A RV ReceptacleNEMA TT-30R
Weight82.00 lb99.2 lbs
Depth23.81 in18 in
Height22.04 in20.1 in
Width12.59 in23.2 in
Noise Level<63 DecibelsExtremely quiet 57 decibels (at quarter load)
Auto Idle ControlEco-mode for energy savingEco-Mode switch (automatically adjust fuel cons…
Connectivity Ports30A RV receptacle—
Electric StartYes—

What reviewers say

FlexPower 4500ies Inverter Generator

  • 4.8 / 544 ratings

Buyers rate it 4.8 out of 5 across 44 ratings. Owners call it much quieter than expected and say it does the job of a larger generator for travel trailer and emergency use.

What people mention
  • NoisePraisedOwners say it runs much quieter than they expected.
  • Power outputPraisedBuyers describe it as twice the machine compared to a Honda 2200.
  • RV usePraisedIt is recommended by owners running it in a travel trailer.
  • Backup usePraisedBuyers say it works well for emergency power at home.

WEN 56380i Inverter Generator

  • 4.5 / 5125 ratings

Owners rate it highly, praising its quiet running and clean power for RV and camping use. Common complaints center on weight and the limits of its running wattage for big loads.

What people mention
  • NoisePraisedOwners say it runs quietly at light and moderate loads, well suited to campgrounds.
  • Power outputMixedReviewers find 3400 running watts enough for essentials but not for large RV air conditioners or whole-home loads.
  • WeightCriticisedOwners note it is heavy and awkward to lift alone.

Questions and answers

Which handles an RV air conditioner better?
The FlexPower 4500ies, with 3600 running watts and 4500 surge watts, leaves more headroom for a rooftop air conditioner's startup draw. The WEN's 3400 rated and 3800 surge watts can run many RV AC units but with less margin.
Which is quieter?
The WEN is rated at 57 dB at quarter load, quieter than the FlexPower's under-63 dB figure. Noise rises with load on both, so the gap narrows under heavy draw.
Which lasts longer?
Both use air-cooled OHV engines and need regular oil changes and fresh fuel. The WEN's fuel shutoff reduces carburetor gumming during storage, which is a common cause of small-generator problems.
Is the FlexPower worth stepping up to?
Yes if you need the extra watts for an RV air conditioner or home backup, or want the larger tank. If your loads are light, the WEN covers them with more ports and lower noise.
Can either run sensitive electronics?
Both are inverter generators producing clean power. The WEN publishes total harmonic distortion under 0.3% at no load and under 1.2% at full load, safe for phones, laptops and tablets.
Can I parallel two units?
The FlexPower 4500ies is listed as parallel ready. The WEN 56380i is not described as parallel capable, so plan on a single unit for its output.

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Buying guides that pick them

  • Best 4000-watt inverter generators with electric start
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Recoil Start
Yes
—
Engine TypeOHV—
Engine Displacement224cc—
Fuel Gauge—Digital fuel display
Runtime—Up to 8.5 hours (half-load)
Low Oil Shutdown—Yes
Overload Protection—Yes
Automatic Shut Off—Yes (Fuel shutoff), Low-fuel automatic shutdown…
Surge wattage—3800 surge watts
Rated wattage—3400 rated watts
Engine—212cc 4-stroke OHV
Half-load runtime—up to 8.5 hours
Fuel tank capacity—2.2-gallon
Run time—8.5 h
Outlets count—6
Build
Praised
Buyers describe solid construction and reliable starting.