Explore Our Family of Brands

12 kW1 Fortress Standby Generator

12 kW1 Fortress Standby Generator

Back-up power for small to medium sized homes

Outlast the next power outage, maintain your family's comfort and power the basics with a 12kW1 Fortress standby generator. Although small, it still packs plenty of power so your home's basic circuits and small appliances stay on during an outage.

12

kW

627cc

Displacement

3600

RPM

6 Year

Limited Warranty

Features

InfoHub™ Wireless Monitoring

Lets you monitor your generator's status on your computer, tablet or smartphone sending maintenance reminders so your generator is always ready for the next power outage. Click here for more information.

Symphony® II Power Management

Manages the distribution of power to your selected appliances automatically. Load management ensures the generator won't overload and shutdown so your family can continue with its daily routine.

Commercial Vanguard™ Engine

Our in-house state of the art equipment to enhance part control which makes the Vanguard™ Engine one of the best in the industry. For the dirty demanding environments, this engine is built to last.

Best in Class Warranty

Covers parts, labor and travel for the full-length of the warranty.2

Assembled and Engineered in the USA

With domestic and foreign parts.

Corrosion Resistant

Durable enclosure made from automotive-grade galvanneal steel to resist rust. Its advanced powder coat paint process results in years of protections against chips and abrasions.

Flexible Placement Options

Includes the ability to install your generator as close as 18 inches from your home.3

Low Idle Mode

Scheduled weekly test mode that runs at a low RPM for fewer disturbances and less fuel consumption. (Only on model #s 040591, 040608)

Superior Customer Support

Our product is backed by our nationwide dealer network and call center experts. Please click here or visit the customer support portal to get your questions answered.

Financing Solution

We have partnered with Synchrony Bank to provide financing solutions that fit your needs. Special financing4 is available on qualified Briggs & Stratton Standby Generators only with the Standby Power Credit Card. Learn More >

1 This generator is rated in accordance with UL (Underwriters Laboratories) 2200 (stationary engine generator assemblies) and CSA (Canadian Standards Association) standard C22.2 No.100-14 (motors and generators).

2 See operator's manual or BRIGGSandSTRATTON.com for complete warranty details.

3 Installations must strictly comply with all applicable codes, industry standards, laws, regulations and provided installation manual. Running engines give off carbon monoxide, an ordorless, 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 or business.

4 Subject to credit approval. Minimum monthly payments required.

Specs

Only 2 products can be compared at once. Please remove one of your selections to compare this product.

Only 3 products can be compared at once. Please remove one of your selections to compare this product.

At least one product must be displayed. Please select another option to remove this product

Model
040546
Running kW (NG)*
11
Running Amps (NG)*
45.8
Engine Displacement (cc)
627
NG Fuel Consumption at 50% Load** (BTU/hr)
50% Load 116.9 ft3/hr
Length (in)
28
Height (in)
37.2
Warranty (Product)***
6 Year Parts, Labor & Travel Limited Warranty
Battery Charger
Yes
Running kW (LP)*
12
Running Amps (LP)*
50
Engine Brand
Briggs & Stratton
Voltage (V)
120/240V AC, Single Phase, 1.0 pf
LP Fuel Consumption at 50% Load** (BTU/hr)
50% Load = 1.7 gal/hr
Width (in)
26
Weight (lbs)
318
Weekly Exerciser
Yes
Model
040579
Running kW (NG)*
11,000
Running Amps (NG)*
45.8
Engine Displacement (cc)
627
NG Fuel Consumption at 50% Load** (BTU/hr)
50% Load 116.9 ft3/hr
Length (in)
28
Height (in)
37.2
Warranty (Product)***
10 Year Parts, Labor & Travel Limited Warranty
Battery Charger
Yes
Running kW (LP)*
12,000
Running Amps (LP)*
50
Engine Brand
Briggs & Stratton
Voltage (V)
120/240V AC, Single Phase, 1.0 pf
LP Fuel Consumption at 50% Load** (BTU/hr)
50% Load = 1.7 gal/hr
Width (in)
26
Weight (lbs)
318
Weekly Exerciser
Yes
Model
040591
Running kW (NG)*
10.8
Running Amps (NG)*
45
Phase
1-Phase
Frequency (Hz)
60
Voltage (V)
120/240
Sound Level (dBA) at 7 Meters
Low Idle Mode - 64 No Load - 69
LP Fuel Consumption at 50% Load** (BTU/hr)
102,000
Width (in)
26.1
Weight (lbs)
361
Weekly Exerciser
6 Exercise Length Options
Running kW (LP)*
12
Running Amps (LP)*
50
Engine Brand
Vanguard®
Circuit Breaker Amps
60
Engine Displacement (cc)
627
Enclosure Materials
Steel
NG Fuel Consumption at 50% Load** (BTU/hr)
87,000
Length (in)
28
Height (in)
37.2
Warranty (Product)***
6 Year
Battery Charger
Included
Model
040608
Running kW (NG)*
10.8
Running Amps (NG)*
45
Phase
1-Phase
Frequency (Hz)
60
Voltage (V)
120/240
Sound Level (dBA) at 7 Meters
Low Idle Mode - 64 No Load - 69
LP Fuel Consumption at 50% Load** (BTU/hr)
102,000
Width (in)
26.1
Weight (lbs)
361
Weekly Exerciser
6 Exercise Length Options
Running kW (LP)*
12
Running Amps (LP)*
50
Engine Brand
Vanguard®
Circuit Breaker Amps
60
Engine Displacement (cc)
627
Enclosure Materials
Steel
NG Fuel Consumption at 50% Load** (BTU/hr)
87,000
Length (in)
28
Height (in)
37.2
Warranty (Product)***
10 Year
Battery Charger
Included
Model
040579
040546
040579
Running kW (LP)*
12,000
12
12,000
Running kW (NG)*
11,000
11
11,000
Running Amps (LP)*
50
50
50
Running Amps (NG)*
45.8
45.8
45.8
Engine Brand
Briggs & Stratton
Briggs & Stratton
Briggs & Stratton
Engine Displacement (cc)
627
627
627
Voltage (V)
120/240V AC, Single Phase, 1.0 pf
120/240V AC, Single Phase, 1.0 pf
120/240V AC, Single Phase, 1.0 pf
NG Fuel Consumption at 50% Load** (BTU/hr)
50% Load 116.9 ft3/hr
50% Load 116.9 ft3/hr
50% Load 116.9 ft3/hr
LP Fuel Consumption at 50% Load** (BTU/hr)
50% Load = 1.7 gal/hr
50% Load = 1.7 gal/hr
50% Load = 1.7 gal/hr
Length (in)
28
28
28
Width (in)
26
26
26
Height (in)
37.2
37.2
37.2
Weight (lbs)
318
318
318
Warranty (Product)***
10 Year Parts, Labor & Travel Limited Warranty
6 Year Parts, Labor & Travel Limited Warranty
10 Year Parts, Labor & Travel Limited Warranty
Weekly Exerciser
Yes
Yes
Yes
Battery Charger
Yes
Yes
Yes

*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 or BRIGGSandSTRATTON.com for complete warranty details.

Transfer Switches

Request an Assessment

 

Fill out the below form for a free in-home estimate.

*This field is required.

Support

Manuals

Download the operator's manual or illustrated parts list for your Briggs & Stratton engine or equipment by following our step-by-step process.

Find Manuals >

FAQs

Have a question? Search our FAQs to find answers related to model specifications, routine maintenance, repair or troubleshooting.

Search FAQs >

Maintenance How-To Articles

Find DIY articles on how to use & maintain your Briggs & Stratton engine or equipment.

Find Articles >

Shop Repair & Maintenance Parts

Find genuine Briggs & Stratton repair and/or maintenance parts for your engine or outdoor power equipment to ensure future performance.

Purchase Parts >

Financing Solution

We have partnered with Synchrony Bank to provide financing solutions that fit your needs. Special financing* is available on qualified Standby Generators only with the Briggs & Stratton Power Credit Card.

Reviews

Q&A

Email Newsletter Sign Up