Compare Generators Side-by-Side
Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Genmax GM15000ET
- Predator 72903
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Genmax GM15000ET | Predator 72903 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 13000 W | 1400 W |
| Starting watts | Winner: Winner: 15000 W | 1800 W |
| Noise (lower limit) | 76 dB | Winner: Winner: 68.9 dB |
| Weight | 242 lbs | Winner: Winner: 60 lbs |
| Run time @50% load | Winner: Winner: 11 h | 9.5 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 10.5 gal | Not available |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 28 x 31.6 x 28.7 | 18.3 x 14 x 16 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120V |
| Voltage (DC) | 12 | Not available |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | 23 % | Not available |
| Engine | ||
| Engine | 520 cc OHV 4-stroke | Not available |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Not available |
| Warranty | ||
| Warranty | 1 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 11000 W | Not available |
| Starting watts | 15000 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 11 h | Not available |
| Run time @25% load | Not available | Not available |
| Natural gas | Not available | Not available |
| Running watts | 12000 W | Not available |
| Starting watts | 12000 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Not available | Not available |
| Propane | Not available | Not available |
| Running watts | 13000 W | Not available |
| Starting watts | 13000 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | Not available |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | Floating | Not available |
| UPC | 760790901382 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 11000 | Not available |
| Running Watts (Propane) | 13000 | Not available |
| Running Watts (Natural Gas) | 12000 | Not available |
| Starting Watts (Gasoline) | 15000 | Not available |
| Starting Watts (Propane) | 13000 | Not available |
| Starting Watts (Natural Gas) | 12000 | Not available |
| Runtime @ 50% Load (Gasoline) | 11 | Not available |
| AC Outlet Types | AC outlets3x Duplex 120V 20A (5-20R)1x 120/240V 30A (L14-30R)1x 120/240V 50A (14-50R) | Not available |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | Not available |
| Engine Displacement | 520 | 98 |
| Engine Oil Type | SAE 10W/30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 11 | Not available |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Starting Components | Recoil starter; Electric starter; Remote starter | Not available |
| Included Accessories | Oil, funnel, tool kit, key fob, battery charger, natural gas hose with NPT adapter, propane hose, cover, neutral bonding plug, battery, and wheel kit | Not available |
| Warranty & identification | ||
| Commercial Warranty | 1 | Not available |
| Additional specs | ||
| Summary | The Genmax GM15000ET is a 13,000-watt tri-fuel generator built for serious power demands. With 13,000 running watts and 15,000 starting watts, this unit can handle whole-house backup scenarios, including central air conditioning, refrigerators, well pumps, and multiple circuits running simultaneously. Because it runs on gasoline, propane, or natural gas, owners gain real flexibility during emergencies when one fuel source might be unavailable or during extended outages when tapping into a home natural gas line eliminates refueling trips entirely. | The PREDATOR® 1800 Watt Portable Generator is a compact and lightweight gas-powered generator designed for low-power applications, featuring CO SECURE® carbon monoxide shutdown for enhanced safety. |
- Most PowerfulGenmax GM15000ET13000W running
- QuietestPredator 7290368.9 dB
- Longest RuntimeGenmax GM15000ET11h at 50% load
Where to buy
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Genmax GM15000ET
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Predator 72903
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