Loading... Please wait...

Model # 40400
MSRP: $3,649.00
Every Day Price: $3,299.00
You Save: $350.00
Contractor Savings:


Leaves Factory In 3-4 Days

Login to Norwall
Add To Compare  |  Add to Wish List

Product Information PDFs

Write a generator porduct review and receive a $10.00 store creditInfo Center
Avg. Product Review Rating: 5.0/5 (based on 2 reviews - read reviews) Write a Review - $10 Store Credit

Briggs & Stratton Automatic 12kW NG/LP Home Generator System with 200 Amp ATS Whole House SE

  • Briggs & Stratton Engine - Application engineered to stringent home generator specifications, these premium engines will provide years of long-lasting, reliable standby power
  • Advanced electronics will detect a utility power outage and automatically start the generator whether you are home or away
  • Advanced Power management - Up to two load-dependent air conditioner units: 4-ton air conditioners
  • Includes 200 Amp ATS w/Service Disconnect 120/240 Single Phase NEMA 3R Cabinet
  • Galvanneal steel provides years of rustproof, outdoor protection
  • 3 Year Limited Parts and Labor Warranty


Details and Specifications

The new streamlined Briggs & Stratton 12kW* Home Generator System meets the power needs of your whole house, with a smaller, more affordable unit. Briggs & Stratton automatic home generators provide permanent, backup protection from power outages for your home, and your family.

Install Within 20" of the Home - Where Code Allows.



 Fully Automatic: Advanced electronics will detect a utility power outage and automatically start the generator whether you are home or away

  • Advanced Power Management: Combine with a Briggs & Stratton® automatic transfer switch to manage up to two load-dependent 3-ton air conditioner units
  • Streamlined, Space Saving Design: Its sleek, compact profile blends in beautifully with your home’s exterior and landscaping, much like your central air conditioner.
  • Durable Outdoor Enclosure: Galvaneal steel provides years of rust proof, outdoor protection – perfect for extreme weather conditions.
  • Maximum Fuel Economy: Smart management of your homes appliances results in less fuel consumption than larger, more fuel hungry generators.
  • Limited 3 Year Parts and Labor Warranty: Your Briggs & Stratton guarantee of quality and performance – one of the best in the industry.
  • Briggs & Stratton® Engine: Application engineered to stringent commercial specifications, these premium engines will provide years of long lasting, reliable standby power. Because Engines Matter.
  • Turn-Key Extras Included: Battery charger, flex fuel line, hour meter, and  installation base
  • Battery Requirement (Battery Not Included): 12 Volt DC, 600 CCA (cold cranking amps), AGM Type with M6 terminal hardware, Recommend Werker Model WKA12-55C/FR

Includes Model 71046:
200 Amp Automatic Transfer Switch
Rated Nema 3R, for Outdoor Installations
Fully Automatic with Service Entrance Disconnect

*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).

** See BriggsandStratton.com for warranty details



Briggs & Stratton $50/$50 Rebate - Click Here

Warranty Information

Consumer Warranty: 3 Year Limited

Product Specifications

Model Number 40400
Manufacturer Briggs & Stratton
Rated Watts 12kW
Rated Amps 50 LP / 45.8 NG
Voltage 120/240V Single Phase
A/C Ton Rating 4 Ton
Enclosure Galvaneal Steel
UL Listed Yes
Decibel Rating 72 db(A)
Starting System Electric, Automatic
Low Oil Alert Yes
Hour Meter Yes
Battery Requirement 12 Volt 600 CCA AGM
Mounting Pad Yes
Product Weight 535
Dimensions (Inches) 34.6L x 39.4W x 38.5H
Engine Brand Briggs & Stratton Profession Series
Engine Size 803cc
Cooling System Air Cooled
Alternator Type Brushless, Computer Friendly
Auto Voltage Regulation Capacitor
Fuel Type LP/NG
NG Power Capacity 11kW
LP Power Capacity 12kW
NG Consumption @ Full Load 197 cu.ft/hr
NG Consumption @ 1/2 Load 119 cu.ft/hr
LP Consumption @ Full Load 2.36 gal/hr
LP Consumption @ 1/2 Load 1.42 gal/hr
Transfer Switch
Transfer Switch Model 71046, Nema 3R Outdoor Rated
Transfer Switch Amps 200 Amps
Transfer Switch Circuits Whole Panel, Service Entrance Rated
ATS Poles 2 Pole
Warranty Information
Consumer Warranty 3 Year Limited
You need to be logged in to write a review.
Write A Review

Product Reviews

  1. Excellent Choice!

    Posted by HEM, Maine on 31st Jan 2013

    I had this generator installed to power my 3900 sqft house when power is lost. The master electrician who did the installation advised that, although it will power my entire house, he cautioned against using both the electric range and electric cloths dryer at the same time. Today, we lost power for more than three hours, and the generator was up and running in 6 seconds, and powering our house in 30 seconds! Worked like a dream...as if we were still on our normal power supply!

    Be sure that you buy the correct amperage panel for your house, i.e. 100 or 200 amp. I was luck that I chose the 200 amp, as my house was wired with a 200 amp panel and was compatable.

    The set-up of the motor is easy to access and easy to maintain as well. However, if you purchase the optional oil heater and battery warmer, I'd recommend asking the dealer from where you purchase to install them prior to shipping. It wasn't difficult installing, but since the system was shipped with oil already in it, it was a bit messy for the oil heater install.

    It's nice to have peace of mind and glad I made the investment! Couldn't have picked a better product in my opinion.

  2. Stood Up To Sandy

    Posted by A&J Electrical Inst., LLC on 8th Nov 2012

    This generator was running for 9 days with no problems. It is quiet an powerful enough for a 2600 sf home. It's unique size also came in handy with zoning requirements.

Recommended Products


Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

Some restrictions apply to "Free Shipping" you may either view our
Shipping Information page or contact us for details.