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12kW 1 Standby Generator System - Back-up power for medium sized homes

Briggs and Stratton 040517


  • Symphony ® II Power Management
  • Amplify Power Management
  • InfoHub™ Wireless Monitoring
  • Commercial Vanguard™ Engine

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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. Transfer switch and modules sold separately. Learn more .

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Amplify Power Management

Our Amplify Power Management system automatically allows you to power more high voltage appliances in your home for less. Added convenience and flexibility for you to be able to change the power priorities via wifi at any time with the ease of a free app on your smartphone. Transfer switches and modules sold separately.
Learn more .

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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. Sold separately. Click here for more information.

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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.

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Best in Class Warranty

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

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Assembled and Engineered in the USA

With domestic and foreign parts.

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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.

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Flexible Placement Options

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

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Low Idle Mode

Scheduled weekly test mode that runs at a low RPM for fewer disturbances and less fuel consumption. (Only on model # 040590)

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Superior Customer Support

Our product is backed by our nationwide dealer network and call center experts. Complete our web form below or visit the customer support portal to get your questions answered.

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Financing Solution

We have partnered with Synchrony Bank to provide financing solutions that fit your needs. Special financing 4 is available on qualified Briggs & Stratton Standby Generators only with the Standby Power Credit Card. Learn more.

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.

New 5 Year Warranty 5 Year Parts, 5 Year 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.

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. Call our U.S.-based Answer Care Representatives by calling (800) 743-4115 or visit the Customer Support Portal to get your questions answered now.

Streamlined, Space-Saving Design With the streamlined, compact design, the new 12k2W is 50% smaller than our previous 12kW generator.

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


  • Symphony ® II Power Management
  • Amplify Power Management
  • InfoHub™ Wireless Monitoring
  • Commercial Vanguard™ Engine
  • Best in Class Warranty
  • Assembled and Engineered in the USA
  • Corrosion Resistant Durable Enclosure
  • Flexible Placement Options
  • Low Idle Mode
  • Superior Customer Support
  • Financing Solution
Model 040517
Running kW (LP)* 12
Running kW (NG)* 11
Running Amps (LP)* 50
Running Amps (NG)* 45.8
Engine Brand Vanguard ®
Phase 1-Phase
Frequency (Hz) 60
Engine Displacement (cc) 627cc
Voltage (V) 120/240V AC, Single Phase, 1.0 pf
NG Fuel Consumption at 50% Load** (BTU/hr) 50% Load 116.9 ft 3 /hr
LP Fuel Consumption at 50% Load** (BTU/hr) 50% Load = 2.36 gal/hr
Length (in) 28
Width (in) 26
Height (in) 37.2
Weight (lbs) 318
Warranty (Product)*** 5 Year Parts, Labor & Travel Limited Warranty
Weekly Exerciser Yes
Battery Charger Yes
Power Management Standard
Control Panel Location Internal
Type Air Cooled
Starter Type Electric
Color Gray
Hour MeterDigital Display Yes

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Lawn equipment can be large, heavy and expensive. You probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new lawn equipment should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.