Firman T09275
Generator · Tri-Fuel Portable. Specs from the manufacturer page (checked ).

The FIRMAN T09275 is a tri-fuel portable generator that runs on gasoline, propane (LPG), or natural gas, rated at 9,200 running watts and 11,400 starting watts on gasoline. It has a 9-gallon fuel tank and is rated for up to 11 hours of runtime at 50% load. It provides 120/240V output through four outlets.
Key features
- Rated 9,200 running watts and 11,400 starting watts on gasoline
- Propane (LPG) rating: 8,300 running / 10,400 starting watts
- Natural gas (NG) rating: 6,900 running / 8,650 starting watts
- 459cc FIRMAN engine with a 9-gallon fuel tank
- Up to 11 hours of runtime at 50% load
- Electric start
- Outlets: 120V 20A GFCI duplex (5-20R), 120V 30A twist-lock (L5-30R), 120/240V 30A twist-lock (L14-30R), 120/240V 50A (14-50R)
- Can be paired with a transfer switch as a portable alternative to a whole-home standby generator
What it is for
- home backup power
- demanding job sites
- farms
- large outdoor events
Specifications
| Running watts | 9200 W |
|---|---|
| Peak / surge | 11400 W |
| Fuel | tri-fuel |
| Tank | 34.1 L (9.0 gal) |
| Run time at 50 % load | 11 h |
| AC output voltage | 120/240V |
From the Firman page. Values the manufacturer does not publish are left out.
What is in the box
- Engine oil bottle
- Oil funnel
- Spark plug wrench
- Double open-ended wrench (10mm, 12mm)
- LPG regulator with hose holder
Similar inverter & portable generators
WEN DF1100T
Champion 9000-Watt Tri Fuel Inverter (201176)
DuroMax XP13000HX
Champion 11500-Watt Tri Fuel
Champion 11000-Watt Dual Fuel Home Backup Inverter
Champion 11000-Watt Remote Start Tri-Fuel Inverter
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Firman T09275 comparisons
- T09275 vs Westinghouse WGen9500DFc
- T09275 vs WEN DF1100T
- T09275 vs Champion 9000-Watt Tri Fuel Inverter (201176)
- T09275 vs DuroMax XP13000HX
- T09275 vs Champion 11500-Watt Tri Fuel
On our lists
Connection and wiring
Follow the diagrams in the Firman manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
- Wiring diagram, manual page 2 →
- Wiring diagram, manual page 40 →
- Wiring diagram, manual page 41 →
- Wiring diagram, manual page 42 →
- Wiring diagram, manual page 43 →
Error codes and troubleshooting
We found no error-code table in this manual. Its troubleshooting section is the reference.
FAQ
How long does the Firman T09275 run on a tank?
The maker rates it at 11 hours at 50 % load (about 4,600 W) on a 9.0-gal tank. A light load such as a refrigerator and lights runs longer; a full load runs shorter.
Can the Firman T09275 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 11400 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.