Back-up power for small to medium sized homes

With its sleek, compact profile, the 12kW1 Home Standby Generator adds new dimension to “Powering More for Less." (Does not include transfer switch)

12 kW1 Fortress Standby Generator System

SKU: 040546
  • Symphony II®

    Thanks to Symphony® II Power Management System, a smaller home generator system by Briggs & Stratton can meet all your needs and save you money in the process.

    6 Year Parts, Labor & Travel Limited Warranty

    The longest warranty in the industry. Our most comprehensive 6 year parts, labor & travel limited warranty.

    Now 60% Quieter*

    Powered by our high-quality Vanguard engine, improved muffler design and re-engineered alternator intake ducting, the new 12kW is 60% quieter than our old 12kW.

    Streamlined, Space-Saving Design

    With the streamlined, compact design, the new 12k2W is 50% smaller than our previous 12kW generator.

    Durable Enclosure

    Designed to weather the elements, the system's enclosure is made from automotive-grade Galvanneal steel to resist rust. Its advanced powder coat paint process results in years of protection against chips and abrasions.

    Flexible Placement3

    Have a tight lot line? Worried about your curb appeal? Install your generator as close as 18" for your home. Our generators are in compliancy with the stringent National Fire Protection Agency 37 standard.


  • Model Number


    Running Watts (NG)*


    Engine Series



    Fully Automatic

    Running Amps (LP)


    Alternator Type

    Computer Friendly

    NG Fuel Consumption**

    50% Load 119 ft3 /hr

    Battery/Battery Charger


    Diagnostic Alerts with Remote System Status

    Low Oil Shutdown, Engine Does Not Start, Low Frequency, Engine Overspeed, Low Voltage, Low Battery Voltage, Oil Temp High, Transfer Switch Fault

    Width (in)


    Weight (lbs)


    Running Watts (LP)*


    Engine Brand

    Briggs & Stratton

    Engine Displacement (cc)


    Voltage (V)

    120/240V AC, Single Phase, 1.0 pf

    Running Amps (NG)


    LP Fuel Consumption**

    50% Load = 2.36 gal/hr

    Weekly Exerciser


    Overcrank Protection


    Length (in)


    Height (in)


    Warranty (Product)***

    6 Year Parts, Labor & Travel Limited Warranty