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Model # 40345
MSRP: $3,599.99
Every Day Price: $3,199.00
You Save: $400.99
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Briggs & Stratton Automatic 12kW NG/LP Home Generator System with 100 Amp ATS 16 Circuit

  • 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 100 Amp Automatic Transfer Switch with 16 Circuit Load Center with ACCM for two A/C Rated NEMA 3R, for Outdoor Installations
  • 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 4-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 71047:
100 Amp Automatic Transfer Switch with 16 Circuit Load Center with ACCM for two A/C
Rated Nema 3R, for Outdoor Installations
Fully Automatic

 *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 40345
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
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 71047, Nema 3R, Outdoor Rated
Transfer Switch Amps 100 Amps
Transfer Switch Circuits 16 Circuits 8 - 20A 120V 1 - 30A 240V 1 - 40A 240V 2 - 50A 240V
ATS Poles 2 Pole
Warranty Information
Consumer Warranty 3 Year Limited
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Product Reviews

  1. Work Horse

    Posted by Dan House on 13th Nov 2013

    I was not at all concerned that Briggs and Stratton could build a good engine but was not sure if they knew how to build a good power generator. After three years and several outages the only think I don't like is that you have to set the time to exercise at the exact time/date that you want. A small hassle but not enough to avoid selecting this brand.

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