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Genmax Backup Generators

Genmax manufactures high-output inverter generators engineered for whole-home backup. Their multi-fuel inverters deliver pure sine power, digital paralleling, and factory floating neutrals for safe transfer switch integration.

Engineering Headquarters Chino, California, USA

Factory Warranty Coverage 2-Year Limited Warranty

Lab Tested Fleet 6 Validated Models

Warranty Triage & Technical Support

Official Genmax Factory Service & Local Contractors

Need authorized warranty repairs or factory parts? Contact official factory support directly or find a certified local generator installer.

Call: 1-888-881-6988 Factory Portal Find Certified Installer

Tested Genmax Generators (6)

Showing all lab-tested Genmax models

Tri-Fuel Score 8.4/10

Open-Frame Inverter 2.4% THD

GENMAX : 458cc 4-Stroke OHV Air-Cooled Cast-Iron Sleeve : Floating Neutral

GENMAX GM10500XiT 10,500W Peak / 8,000W Running Open-Frame Tri-Fuel Inverter

Best For: Value-focused whole-home 50-amp interlock backup with factory Floating Neutral and <3% pure sine wave.

Running / Surge 8,000W / 10,500W

Noise @ 23ft 68 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (13.5h)

Backup Outlet NEMA 14-50R

Power Purity <2.4% THD (Floating)

Weight & Mobility 156.5 lbs (Wheel Kit)

Lowest Verified Price

$1,549.00

$0.19 / Running Watt

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Tri-Fuel Score 8.7/10

Enclosed Inverter 2.1% THD

GENMAX : 458cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

GENMAX GM10500iETC 10,500W Peak / 8,500W Running Enclosed Tri-Fuel Inverter

Best For: Suburban homeowners wanting a quiet 62 dBA enclosed tri-fuel inverter with Factory Floating Neutral.

Running / Surge 8,500W / 10,500W

Noise @ 23ft 62 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (14h)

Backup Outlet NEMA 14-50R

Power Purity <2.1% THD (Floating)

Weight & Mobility 216 lbs (Wheel Kit)

Lowest Verified Price

$2,199.00

$0.26 / Running Watt

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Tri-Fuel Score 8.9/10

Enclosed Inverter 2.3% THD

Genmax : 458cc 4-Stroke OHV Commercial Engine : Floating Neutral

Genmax GM12000iET 12,000W Peak / 9,000W Running Tri-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 9,000W / 12,000W

Noise @ 23ft 66 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (12h)

Backup Outlet NEMA 14-50R

Power Purity <2.3% THD (Floating)

Weight & Mobility 195 lbs (Wheel Kit)

Lowest Verified Price

$1,899.00

$0.21 / Running Watt

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Dual-Fuel Score 8.5/10

Enclosed Inverter 2.2% THD

Genmax : 312cc 4-Stroke OHV Air-Cooled Engine : Floating Neutral

Genmax GM6000iED 6,000W Peak / 5,000W Running Dual-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 5,000W / 6,000W

Noise @ 23ft 62 dBA (Quiet)

Fuel & Runtime Gas EFI (11.5h)

Backup Outlet NEMA L14-30R

Power Purity <2.2% THD (Floating)

Weight & Mobility 118 lbs (Wheel Kit)

Lowest Verified Price

$999.00

$0.20 / Running Watt

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Dual-Fuel Score 8.5/10

Enclosed Inverter 2.3% THD

GENMAX : 312cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

GENMAX GM7500aIED 7,500W Peak / 6,000W Running Enclosed 240V Dual-Fuel Inverter

Best For: 30-amp home transfer switches needing a lightweight 141-lb enclosed 240V dual-fuel inverter.

Running / Surge 6,000W / 7,500W

Noise @ 23ft 61 dBA (Quiet)

Fuel & Runtime Gas EFI (13.5h)

Backup Outlet NEMA L14-30R

Power Purity <2.3% THD (Floating)

Weight & Mobility 141.1 lbs (Wheel Kit)

Lowest Verified Price

$1,199.00

$0.20 / Running Watt

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Dual-Fuel Score 8.5/10

Enclosed Inverter 2.2% THD

GENMAX : 458cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

GENMAX GM9000iED 9,000W Peak / 7,600W Running Enclosed Dual-Fuel Inverter

Best For: Propane and gasoline backup with Factory Floating Neutral and quiet enclosed acoustics.

Running / Surge 7,600W / 9,000W

Noise @ 23ft 61.5 dBA (Quiet)

Fuel & Runtime Gas EFI (15h)

Backup Outlet NEMA 14-50R

Power Purity <2.2% THD (Floating)

Weight & Mobility 198 lbs (Wheel Kit)

Lowest Verified Price

$1,799.00

$0.24 / Running Watt

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