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ReaLoad Engineering Benchmark

DuroMax XP12000EH vs. GENMAX GM10500XiT

Fuel Benchmark:
Elevation:

ReaLoad Technical Verdict & Engineering Dossier

Motor Surge & HVAC Starting

GENMAX GM10500XiT delivers 10,500W surge, sufficient for a 3.5-Ton central A/C with soft-starter. Inverters under 7,500W surge will trip breaker overcurrent protection on direct compressor starts.

72-Hour Fuel Logistics

At 50% load over 72 hours, continuous gasoline generators consume ~56 gallons (11x 5-gallon cans). Direct utility Natural Gas hookup eliminates fuel storage degradation, winter freezing, and gas station queues.

NEC 250.20 Neutral Bonding

GENMAX has factory floating neutral, safely compliant with 3-pole transfer switches and manual panel interlocks without ground loop faults.

Natural Gas Leader
GENMAX GM10500XiT
6,800 W running on NG (+6800 W lead)
Acoustic Winner
GENMAX GM10500XiT
68 dBA at 23ft (-4 dBA quieter)
Easiest Home Hookup
GENMAX GM10500XiT
Floating Neutral (Home Interlock Ready)
Best $/Running Watt
DuroMax XP12000EH
$0.12/W ($1,099)
Technical Specification
Open-Frame Inverter
Open-Frame Inverter
Running Watts (gasoline at 0 ft)
Power Output
9,500 WBest
8,000 W
Peak Motor Starting Surge (gasoline)
Power Output
12,000 WBest
10,500 W
Continuous 240V Split-Phase Amps
Power Output
39.6 ABest
33.3 A
Sine Wave Purity (Total Harmonic Distortion)
Power Quality
<4.9% THD (Pure Sine)
<2.4% THD (Pure Sine)Best
Fuel Burn at 25% Load (GPH / Hr)
Fuel Consumption
0.65 GPH
0.51 GPHBest
Fuel Burn at 50% Load (GPH / Hr)
Fuel Consumption
1.15 GPH
0.91 GPHBest
Continuous Runtime on Tank at 25% Load
Fuel Consumption
16 HoursBest
13.5 Hours
Gasoline Fuel Tank Capacity
Fuel Consumption
8.3 GallonsBest
6.9 Gallons
14-50R Outlets (50A 120/240V Whole-House)
Outlets & Receptacles
1x NEMA 14-50R (50A)Best
1x NEMA 14-50R (50A)Best
L14-30R Outlets (30A 120/240V Twist-Lock)
Outlets & Receptacles
1x NEMA L14-30R (30A)Best
1x NEMA L14-30R (30A)Best
TT-30R Outlets (30A 120V RV Travel Trailer)
Outlets & Receptacles
NoneBest
NoneBest
5-20R Duplex Outlets (20A 120V Household GFCI)
Outlets & Receptacles
2x NEMA 5-20R DuplexBest
2x NEMA 5-20R DuplexBest
Engine Starting Methods
Starting & Safety
Electric Push-Button & Recoil Pull
Wireless Remote, Electric Key & Recoil
Carbon Monoxide Auto-Shutoff Sensor
Starting & Safety
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
CO Watchdog / Shield Sensor (ANSI/PGMA G300)
Noise Level at 23ft (25% Load)
Acoustics & Physical
72 dBA
68 dBABest
Chassis Dimensions (L × W × H)
Acoustics & Physical
29" L × 30" W × 26" H
30.5" L × 22.4" W × 25.4" H
Dry Weight with Wheel Assembly
Acoustics & Physical
224 lbs
156.5 lbsBest
Factory Neutral Bonding (NEC 250.20)
NEC 2026 Hookup
Bonded Neutral (Unbonding Required for Home ATS)
Floating Neutral (Ready for Home Interlock)
Lowest Verified Street Price
Cost & Value
$1,099.00Best
$1,549.00