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GENMAX · Inverter generator

GM5500iHD

Gasoline + battery assist inverter generator with 5,500 peak watts

3,800W running5,500W peakSee manufacturer pageGasoline + battery assist
Compare retailer offers Retail pricing varies
GENMAX GM5500iHD 5500W Portable Hybrid Inverter Generator 2026
Official product image: GENMAX

Product decision summary

Researched by · reviewed under the FMG editorial standard · Sep 15, 2026

Trace the evidence · not a hands-on review

Bottom line

Best for specific needs for rv power & home essentials.

Best for: RV power & Home essentials

Running output

3,800W

Fuel / power

Gasoline + battery assist

Weight

56.7 lb

Strongest reasons

  • 3,800 running watts and 5,500 peak watts for rv power and home essentials.
  • Product weight is lighter than 82% of its class.
  • Peak output is higher than 80% of its class.

Know before buying

A reliable public price is not currently published. Confirm the delivered total and return terms with the seller.

Best current buying route

Check current price

See current offers at Amazon

Ranked first across 2 verified sellers using listed price, stock status, freshness, and published terms. Shipping is not yet comparable. Confirm price, stock, shipping, and the exact model on the seller’s site.

Check price & availability

Affiliate links may earn us a commission at no added cost to you. Disclosure

Never run a fuel-burning generator in a home, garage, shed, or other enclosed or partly enclosed space.

Price intelligence Evidence ledger Accessories & manuals

Key specifications

The numbers that drive the decision.

Published values stay labeled, and every usable metric includes class context. Missing data is shown instead of estimated.

Open complete specifications
SpecificationThis model
Running output3,800WHigher than 61% of its class
Peak / starting output5,500WHigher than 80% of its class
Published runtime1.5 hrLonger than 1% of its class
Product weight56.7 lbLighter than 82% of its class
Published sound levelNot publishedNo class comparison available
Fuel / power sourceGasoline + battery assistInverter generator
Best current priceCheck current priceSee current offers at Amazon

Class comparisons use 177 mid output inverter generators. Runtime figures can use different loads, fuels, or test conditions; confirm the model manual before planning fuel or battery duration.

Product gallery & complete specifications Official imagery, full spec tables, use cases, and source linksView details

Visual spec gallery

The deciding numbers, made scannable.

01 · Maximum output

5,500W peak

Continuous output3,800W running

Size around running load first, then confirm the peak rating covers the largest startup surge.

02 · Fuel output

Gasoline + battery assist

Gasoline + battery assist

3,800W run · 5,500W peak

Alternative-fuel ratings are shown only when GENMAX publishes a fuel-specific figure.

03 · Portability

56.7 Pounds

Unit weight

19.1"L x 11.2"W x 17.9"H

Dimensions

Sound rating

See manufacturer page

04 · Controls & ownership

Starting

See manufacturer page

CO shutoff

Manufacturer-listed

Parallel

Not listed

Warranty

3 years

Official product gallery

Every manufacturer view in one place.

GENMAX imagery can include the enclosure, control panel, outlets, dimensions, feature callouts, and included accessories.

Official GENMAX GM5500iHD product image 1
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Official GENMAX GM5500iHD product image 7
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Official GENMAX GM5500iHD product image 8
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Official GENMAX GM5500iHD product image 9
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Complete specifications

Manufacturer data, organized for comparison.

Power ratings, features, imagery, manuals, and seller links come from GENMAX’s current U.S. model page. A missing figure is labeled instead of estimated.

Never run a portable generator indoors. Keep it at least 20 feet from occupied buildings with exhaust directed away from doors, windows, and vents. Use a qualified electrician and approved transfer equipment for home connections.

Model overview

3,800 running watts and 5,500 peak watts for rv power and home essentials. Confirm exact configuration and included accessories with the seller before purchase.

Fuel-specific output

Gasoline + battery assist
3,800W running / 5,500W peak

Operation & ownership

Engine
See manufacturer page
Voltage / frequency
See manufacturer page / 60 Hz
Runtime
1.5 hours), with no manual operation required, ensurin
Fuel capacity
See manufacturer page
Sound
See manufacturer page
Starting methods
See manufacturer page
Unit size / weight
19.1"L x 11.2"W x 17.9"H / 56.7 Pounds
Warranty
3 years

Connections

See manufacturer page

Manufacturer feature details

【Revolutionary Hybrid Boost Technology】 3800W Rated / 5500W Peak Power. Our exclusive hybrid assist system integrates a gas engine with a detachable battery to deliver explosive peak power, capable of starting both a 15,000 BTU and a 10,000 BTU air conditioner at the same time. Enjoy 5500W-level peak performance in a lightweight, compact 2000W-sized frame.
【 300W Battery-Only AC/DC Output】Power 300W of AC/DC devices without ever starting the engine for zero noise operation—ideal for camping and quiet office use. With auto charge & stop, it reliably meets your daily low-power needs continuously and conveniently.
【144Wh portable power station】 The external battery supports bidirectional charging and discharging with independent output ports, so it works standalone as a power bank for phones, laptops and devices. It can be recharged with any Type‑C charger, no special adapter needed. You get a complete generator plus a dedicated 144Wh portable power station in one system.
【Smart Auto-Charge & Extended Runtime】In auto mode, when the battery voltage is below 16V, the generator automatically charges the battery while supplying power to the load (fully charged in about 1.5 hours), with no manual operation required, ensuring continuous and stable power supply.
【Clean & Quiet Energy for Sensitive Devices】 Delivers ≤3% Total Harmonic Distortion (THD) pure sine wave power, safe for sensitive electronics like laptops, phones, and medical equipment, Perfect for modern digital lifestyles.
【Safety Features & EPA Certified】Includes a built-in CO sensor for safety and EPA certified for sale in the USA. Backed by a 3-Year Limited Warranty and ongoing technical support.
Show the full manufacturer specification table
Power Source
Fuel Powered
Brand Name
GENMAX
Output Wattage
5500
Included Components
Dual-Purpose Screwdriver, Spark Plug Socket Wrench, NEMAL14-30P Bonding Plug, Remote Control Key, Battery, Instruction Manual
Additional Features
CO Sensor
Model Number
GM5500iHD
Item Weight
56.7 Pounds
UPC
760790742763
Item Dimensions L x W x H
19.1"L x 11.2"W x 17.9"H
ASIN
B0GT8WW8XP
Warranty Description
3 years

Current seller links

Compare offers from GENMAX-listed retailers.

These destinations are supplied on the official model page. Prices and availability can change.

AmazonGenerator Superstore

Best-fit uses

  • RV power
  • Home essentials
  • Tailgating
  • Jobsite tools

Standout features

  • 3,800 running / 5,500 peak watts
  • Gasoline + battery assist
  • Manual start
  • CO shutdown system

Compare it with your actual load.

Run your essentials through the calculator before choosing a generator.

Check my power plan
Official sources:Model pageAll GENMAX generatorsVerified September 15, 2026

Price & Availability

Compare the whole buying route.

The lowest sticker price is not always the best offer. We rank exact-model seller pages using price, stock, shipping, freshness, returns, and warranty details—then show what is still unknown.

Price and delivered cost

Shipping is included only when the seller publishes a usable amount.

Stock and freshness

Current, low-stock, preorder, and stale records are scored differently.

Purchase protections

Published return and warranty terms improve evidence confidence.

Affiliate-neutral ranking

Commission status is recorded but never adds ranking points.

Watch this model

Save it to your shortlist to retain the current price snapshot and turn price and safety watches on or off.

Best current buying route

GENMAX GM5500iHD

Review soon

See current offers

Check current price

at Amazon · Verify stock

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Seller options

2

0 with price

Offer rank

22/100

Relative to listed sellers

Data confidence

30%

5 open fields

Delivered totals

0/2

Shipping included

Ranked first across 2 verified sellers using listed price, stock status, freshness, and published terms. Shipping is not yet comparable.

Seller data checked Sep 17, 2026.

Shipping not yet verified.

Open fields: current price, confirmed stock, delivered cost, return window, warranty term.

As an Amazon Associate we earn from qualifying purchases. Prices, local stock, shipping, taxes, installation, and seller terms can change. Confirm the exact model and final checkout total before buying. Affiliate disclosure.

Seller comparison

Every verified exact-model destination.

Browse all priced models

2 exact-model seller destinations are ranked using price, availability, shipping, freshness, and published protections.

Amazon

Best overallAffiliate
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Total not available

Availability
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Shipping
Shipping not yet verified
Returns
Not verified
Warranty
Not verified
Verify seller

30% data confidence · checked Sep 17, 2026

GENMAX

Review soon

Check current price

Total not available

Availability
Verify stock
Shipping
Shipping not yet verified
Returns
Not verified
Warranty
Not verified
Verify seller

30% data confidence · checked Sep 15, 2026

Price history

A durable record, starting with verified snapshots.

We preserve each dated seller observation instead of replacing the old number. Trends use the lowest verified listed price on each observation date—not an estimated market price.

Amazon

Check current price · Verify stock

Verify offer

Ownership

What living with it looks like.

Ownership requires a safe fuel plan, hour-based engine service, correct storage, and confidence that parts and support are accessible.

Ownership rule

Use the exact GENMAX GM5500iHD manual for maintenance intervals, fluids, storage limits, and warranty requirements. Similar models are not interchangeable.

Open owner’s manual Manufacturer support

Published warranty

3 years

Coverage can vary by use, seller, and region. Confirm eligibility and exclusions before purchase.

Service information

1 official resource

An owner or operator manual is linked below for exact service intervals.

Routine upkeep

Engine service required

Oil, filters, spark plug, fuel system, and starting battery needs vary by model and hours used.

Handling & storage

56.7 lb · Gasoline + battery assist

Store dry, fully cooled, and away from ignition sources; follow the manual’s fuel-storage procedure.

Practical care plan

From delivery to long-term readiness

  1. 1

    Day one

    Register and record the exact unit

    Save the receipt, serial number, seller, warranty terms, and model-specific manual before packaging is discarded.

  2. 2

    Before first load

    Complete setup and break-in correctly

    Add the specified oil, inspect the fuel system, position the generator outdoors, and follow the exact break-in and first-service instructions in the manual.

  3. 3

    Before every use

    Check the safety-critical basics

    Check oil level, leaks, cords, outlets, grounding instructions, CO-safe placement, and the transfer equipment needed for any building connection.

  4. 4

    By hours and season

    Log service and keep it outage-ready

    Track running hours and perform oil, filter, spark-plug, fuel-system, and starting-battery service at the intervals published for this exact model.

Before you buy

Five ownership questions to settle first

  • Confirm that 3 years applies to your seller, region, and intended use.
  • Open the official manual for GM5500iHD and review setup, service intervals, warnings, and storage requirements.
  • Verify access to GENMAX parts, authorized service, and a practical return path in your area.
  • Plan approved fuel storage, outdoor operating clearance, weather protection, and safe refueling.
  • Confirm the unit, fuel or charging gear, and essential cords fit the intended storage and transport space.
Manuals and compatible accessories Compare seller protections

Evidence

See the proof behind the conclusion.

We separate sourced facts, reproducible calculations, editorial judgments, and missing evidence. That makes every important claim easier to inspect—and harder to overstate.

Published-data coverage

75%documented

6 of 8 relevant evidence fields are documented for this model.

Source-backed editorial analysis—not a hands-on or laboratory test.

Read our evidence standard Explore original market research

Source record

2 traceable sources

Last reviewed Sep 15, 2026

Hands-on testing

Checking ledger…

No manufacturer data is presented as an independent test

Verified owners

Checking reports…

Percentages stay hidden until the sample qualifies

CPSC screening

No model-text match

39 generator recall records screened

75%

Documented fields

2

Traceable sources

3

Reproducible calculations

2

Open evidence gaps

Original calculation

Published surge reserve

1,700W

5,500W peak − 3,800W running

44.74% above rated running output. This is arithmetic headroom, not a promise that every motor load will start.

Original calculation

Rated power density

67.02 running W/lb

3,800W ÷ 56.7 lb

A catalog-derived portability ratio. It does not account for handles, wheels, shape, or how the weight feels in use.

Original calculation

Strongest class-relative spec

82th percentile

Product weight: 56.7 lb ranked within 177 mid output inverter generators

Lighter than 82% of its class

Claim-by-claim evidence ledger

Evidence typeClaimBasisTrace
Published factSource-backed3,800W running and 5,500W peak output are recorded for this model.Model-specific output fields in the catalog.Official model source
Published factSource-backedGasoline + battery assist power and 56.7 lb product weight are recorded.Published configuration and dimensional data.Official model source
Original calculationReproduciblePublished surge reserve: 1,700W.5,500W peak − 3,800W runningCalculation standard
Original calculationReproducibleRated power density: 67.02 running W/lb.3,800W ÷ 56.7 lbCalculation standard
Original calculationReproducibleStrongest class-relative spec: 82th percentile.Product weight: 56.7 lb ranked within 177 mid output inverter generatorsCalculation standard
Editorial judgmentEditorialBest for specific needs for rv power & home essentials.Class score 54/100, declared best use, comparative specifications, and explicit buying cautions.Inspect the score
Editorial judgmentEditorialA reliable public price is not currently published. Confirm the delivered total and return terms with the seller.Editorial risk check based on product category, weight, output, price availability, and missing fields.Judgment standard
Open evidence gapCautionPublished price is not sufficiently documented in the current record.The field remains unknown rather than being inferred from a related model or marketing language.Not available
Open evidence gapCautionSound level is not sufficiently documented in the current record.The field remains unknown rather than being inferred from a related model or marketing language.Not available

What this evidence cannot prove

  • No Find My Generator hands-on test, instrumented load test, teardown, or long-term ownership trial is claimed for this page.
  • Manufacturer specifications may use different fuels, loads, test distances, temperatures, or operating modes. Cross-brand comparisons inherit those differences.
  • A reliable public price was not available, so price-efficiency analysis is excluded.
  • Published price is missing and receives no invented or estimated value.
  • Sound level is missing and receives no invented or estimated value.

Editorial analysis for GENMAX GM5500iHD. Source record last verified Sep 15, 2026. Corrections can be submitted through the contact page with a model-specific source.

Ownership resources

Accessories, manuals, and documents.

Start with the exact GENMAX GM5500iHD model or item number. Accessory families can look alike while using different connectors, electrical limits, engines, or mounting points.

Compatible accessories

Match by model and connection.

Verify exact fit

Generator power cord or inlet connection

Use a correctly rated cord or professionally selected inlet connection for the intended load.

Match voltage, amperage, blade pattern, and wire rating to the generator receptacle. Home connections require approved transfer equipment and qualified installation.
View official accessory options
Verify exact fit

Maintenance kit and service parts

Model-matched filters, spark plugs, batteries, oil supplies, and service parts support scheduled maintenance.

Match the complete GM5500iHD model or item number and follow the maintenance table in its manual.
View official accessory options
Verify exact fit

Storage cover or approved running shelter

A fitted storage cover protects a cooled, stored generator. A running shelter must be designed for generator operation.

Never run a fuel-burning generator indoors or inside a storage cover. Follow the manual’s clearance and ventilation requirements.
View official accessory options

Manuals & PDFs

Official product materials.

Manuals and document lookupSupport pageSearch GENMAX support materials using the complete model, item, or serial number.

Compatibility note: Links lead to manufacturer or official retailer resources. Confirm the full model or item number, connector type, voltage, amperage, and published compatibility list before buying. Installation involving a home panel, inlet, transfer switch, or fuel plumbing should be handled as required by local code.

Deeper analysis

Open the details you need

The key decision is above. These supporting scorecards, owner signals, and evidence notes stay out of the way until you want to inspect them.

Fit and score detailsSee the class benchmarks and personalize the fit score for your needs.

Find My Generator score

54/ 100

Best for specific needs

Compared with 177 mid output inverter generators in the current catalog.

Power71

Running and peak output versus the class

Endurance1

Longest published runtime figure

Portability82

Lower weight scores higher

Fuel flexibility55

Single-fuel operation

Class comparison

See what each spec really means.

A number is more useful with context. Each row shows this model beside its class median and translates the difference into a percentile.

Running output

Higher than 61% of its class

This model · 3,800W
Median · 3,500W

Peak output

Higher than 80% of its class

This model · 5,500W
Median · 4,500W

Published runtime

Longer than 1% of its class

This model · 1.5 hr
Median · 9 hr

Product weight

Lighter than 82% of its class

This model · 56.7 lb
Median · 91 lb

How the score works: Scores use published specs and are relative to comparable products in this catalog. Missing specs are excluded and remaining weights are normalized. Runtime is the longest manufacturer-published figure and may use a different load or fuel than another model.

Size a generator for your own appliances

Starter Fit Score

86/ 100

Strong fit

For a 3,000W target and a $1,500 budget.

Clears your critical profile limits

Why it scored this way

A score you can inspect and change.

This personal score is separate from the model’s class score. It measures fit against your priorities and gives neutral partial credit when price or noise data is missing.

Power fit

35/35

Clears your 3,000W running target.

Budget fit

11/20

Price is not published; confirm the current offer.

Fuel fit

15/15

Gasoline + battery assist works with your flexible fuel preference.

Portability

10/10

56.7 lb against your medium portability priority.

Noise fit

6.5/10

Noise is not published; quietness gets a neutral score.

Use-case fit

8.5/10

Home-backup fit rewards adequate output and fuel flexibility.

Tune my profile
Testing, reviews and evidenceCheck hands-on testing status, owner reliability signals, sources, and data confidence.
Checking the hands-on test ledger…

Testing protocol

The methods behind every result.

This category-specific protocol defines the questions, equipment, conditions, outputs, and safety gates required for this exact model. Published specifications stay visibly separate from hands-on measurements.

Open the hands-on test ledger Read the full test protocol Download measurement worksheet

Manufacturer-published baselines

Rated running output

3,800W

Published

Peak / starting output

5,500W

Published

Product weight

56.7 lb

Published

Published sound level

Not published

Not published

These numbers organize the test plan. They are not independent confirmations.

Model-specific test matrix

Questions the measurements must answer.

01

Planned measurement

Continuous output & regulation

Pending

Can GM5500iHD hold useful loads without unacceptable voltage or frequency drift?

After manufacturer-specified warm-up, apply a correctly rated resistive load bank at 25%, 50%, 75%, and 100% of rated running output. Hold each step for a defined interval and continuously log watts, volts, frequency, and protective events.

Sustained wattsVoltage rangeFrequency rangeFaults or shutdowns
02

Planned measurement

Starting-load response

Pending

How much voltage and frequency sag occurs during a repeatable stepped starting load?

Use a controlled, instrumented starting-load fixture within published limits. Repeat the same step three times and record the lowest voltage, lowest frequency, recovery time, and whether protection trips.

Peak delivered wattsVoltage sagFrequency sagRecovery time
03

Planned measurement

Fuel use & runtime

Pending

How much usable energy is produced from a measured fuel quantity?

Outdoors at a controlled load, record the starting and ending fuel mass or volume using a safe approved method. Log elapsed time and delivered watt-hours without refueling during the valid measurement window.

Runtime at stated loadFuel per hourkWh per unit of fuelTest fuel and mode
04

Planned measurement

Sound profile

Pending

How loud is the unit under repeatable operating loads?

At an open outdoor site, measure A-weighted sound with a calibrated meter at 7 m / 23 ft on four sides at idle or eco, 25%, 50%, and 75% load. Publish distance, meter response, wind, surface, and ambient level.

dBA by side and loadAmbient dBADistanceOperating mode
05

Planned measurement

Cold & hot starting

Pending

How consistently does the unit start under documented conditions?

Follow the manual exactly and record three ambient-temperature starts plus three heat-soaked restarts. Report attempts, elapsed time, start method, battery state, and any intervention.

Attempts per startStart timeAmbient temperatureStart method

Controlled conditions

  • Record the exact model, serial number, firmware, sample source, and test date before any measurement.
  • Log ambient temperature, humidity, elevation, wind, surface, and background sound for every test block.
  • Record instrument model, range, accuracy, and most recent calibration or verification date.
  • Repeat timing, starting, and sound measurements three times when conditions allow; publish every valid run.
  • Keep original notes, load logs, meter exports, photos, and any excluded-run explanation with the result.

Required equipment class

  • Rated resistive or programmable load bank
  • True-RMS power, voltage, and frequency logger
  • Calibrated Class 1 or Class 2 sound-level meter
  • Approved fuel-measurement equipment and fire protection
  • Weather meter, timer, tachometer, and non-contact thermometer

Safety gate

Operate fuel-burning equipment outdoors only, far from occupied structures, openings, and ignition hazards, with working carbon-monoxide monitoring for personnel.

Testing is for qualified personnel using correctly rated load equipment and the manufacturer’s required grounding, bonding, clearance, and protective-device instructions.

Never connect a generator directly to building wiring or bypass overload, temperature, battery, GFCI, or carbon-monoxide shutdown protection.

Stop a run for unstable voltage or frequency, overheating, fuel or electrolyte leakage, abnormal sound, damaged wiring, or any manufacturer fault indication.

Badge rule: this product receives no “FMG Tested” label or score benefit until a real unit, instruments, conditions, valid runs, raw records, and limitations are documented under the public protocol.

Verified owner reliability

What happens after the honeymoon period?

Long-term reports from confirmed owners show starting, maintenance, failure, support, and recommendation outcomes for the GENMAX GM5500iHD.

See how ownership is verified

Verified owners only

Be the first confirmed owner to report back.

Checking reports…

Reliability percentages stay hidden until at least 5 ownership-verified reports are published for this exact model — 5 more needed.

Ownership checked

Purchase or registration evidence is reviewed privately.

Time in service

Reports separate new ownership from 12+ month experience.

Failures documented

Repairs and maintenance are captured, not buried in a star.

Reports stay private while ownership and model details are checked. Contact information is never shown publicly.

Data trust & safety

Fresh specifications. Visible recall checks.

We show when this record was verified, where its specifications came from, and whether its model number appears in the official CPSC generator-recall dataset.

Review soon

Specification freshness

Last verified
Sep 15, 2026
Review target
Oct 15, 2026
Primary source
Manufacturer / official listing

Prices can change faster than technical specifications. Always confirm the current price, exact model number, and manual before purchase.

CPSC model screening

No model-number match found

39 records checked
The GENMAX GM5500iHD model text did not match the generator recall records in our current CPSC snapshot. This is a screening result, not a guarantee or safety certification. Recalls can be serial-number specific, newly published, or use a different product description.
Search CPSC directly Dataset checked Sep 16, 2026

Research owner

Founder & lead researcher

Editorial sign-off

Find My Generator Editorial Review

Accountable editor: Andrew Petla

Review scope: exact model identity, published specifications, calculation inputs, source quality, safety language, and affiliate independence. This is an internal editorial review, not third-party engineering, electrical, or safety certification. Hands-on testing is claimed only when a complete test record is published.Request a correction.
Read the full data methodology

Related actions

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