12 kW1 Fortress Standby Generator System

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."

12

kW

627cc

Displacement

3600

RPM

6 Year

Limited Warranty

Features

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 12kW 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" from your home. Our generators are in compliance with the stringent National Fire Protection Agency 37 standard.

Superior Customer Support

Shopping for the right standby generator for your home can be confusing, but Briggs & Stratton will be with you every step of the way. Complete our web form below or visit the Customer Support portal to get your questions answered.

Financing Solution

We have partnered with Synchrony to provide financing solutions that fit your needs. Special financing* is available on qualified Briggs & Stratton Standby Generators on the Briggs & Stratton Standby Power Credit Card.
*Subject to credit approval Minimum monthly payments required.

*Based on no-load sound power. Not for Prime Power or use where standby systems are legally required, for serious life safety or health hazards, or where lack of power, hampers rescue of fire-fighting operations.
This generator is rated in accordance with UL (Underwriters Laboratories) 2200 (stationary engine generator assemblies) and CSA (Canadian Standards Association) standard C22.2 No. 100-04 (motors and generators)
3Installations must strictly comply with all applicable codes, industry standards, laws, regulations and provided installation manual. Running engines give off carbon monoxide, an odorless, colorless, poisonous gas so it is important to keep exhaust gas away from any windows, doors, ventilation intakes or crawl spaces. The installation manual contains specific instructions related to generator placement in addition to NFPA 37, including the requirement that Carbon monoxide detectors be installed and maintained in your home.

Specs

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Model Number
040546
Running Watts (NG)*
11,000
Engine Series
Vanguard™
Operation
Fully Automatic
Running Amps (LP)
50
Alternator Type
Computer Friendly
NG Fuel Consumption**
50% Load 116.9 ft3 /hr
Battery/Battery Charger
Yes
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)
26
Weight (lbs)
318
Running Watts (LP)*
12,000
Engine Brand
Briggs & Stratton
Engine Displacement (cc)
627
Voltage (V)
120/240V AC, Single Phase, 1.0 pf
Running Amps (NG)
45.8
LP Fuel Consumption**
50% Load = 1.7 gal/hr
Weekly Exerciser
Yes
Overcrank Protection
Yes
Length (in)
28
Height (in)
37.2
Warranty (Product)***
6 Year Parts, Labor & Travel Limited Warranty

*NG = Natural Gas; LP = Liquid Propane.
**Fuel consumption rates are estimated based on normal operating conditions at 1/2 load. Generator operation may be greatly affected by elevation and the cycling operation of multiple electrical appliances - fuel flow rates may vary depending on these factors.
***See Operator's Manual for complete warranty details

Transfer Switches

Transfer Switch Features Model
100 Amp, 16 Circuit Transfer Switch 100 Amp transfer switch with integrated load center for powering up to 16 standby circuits. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071047
100 Amp, 16 Circuit Pre-Wired Transfer Switch 100 Amp pre-wired transfer switch with integrated load center for powering up to 16 standby circuits is also equipped with the wiring needed for installation, saving you time and money. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071076
100 Amp Symphony® II Transfer Switch 100 Amp transfer switch with Symphony II Power Management System designed to power all standby circuits on a 100 amp electrical service. Our patented, power management system lets you manage your whole house power with a smaller generator. That not only lowers fuel consumption; it also lowers your costs of generator installation, maintenance and operation. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071071
100 Amp, Transfer Switch 100 Amp transfer switch designed to power all standby circuits on a 100 amp electrical service. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071100
150 Amp Transfer Switch 150 Amp transfer switch designed to power all standby circuits on a 150 amp electrical service. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071150
150 Amp, Symphony® II Transfer Switch 150 Amp transfer switch with Symphony II Power Management System designed to power all standby circuits on a 150 amp electrical service. Our patented, power management system lets you manage your whole house power with a smaller generator. That not only lowers fuel consumption; it also lowers your costs of generator installation, maintenance and operation. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071070
200 Amp Transfer Switch 200 Amp transfer switch designed to power all standby circuits on a 200 amp electrical service. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. 071200
200 Amp, Symphony® II Transfer Switch 200 Amp transfer switch with Symphony II Power Management System designed to power all standby circuits on a 200 amp electrical service. Our patented, power management system lets you manage your whole house power with a smaller generator. That not only lowers fuel consumption; it also lowers your costs of generator installation, maintenance and operation. This transfer switch is NEMA 3 rated meaning it can be installed either indoor or outdoors. Pair with air-cooled generators. 071068

Support

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