Briggs and Stratton 40345 Liquid Propane / Natural Gas 12 kW, 120/240V Single-Phase Steel Standby Generator with 100A 16-Circuit Automatic Transfer Switch

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Configure your Briggs and Stratton 40345 12 kW, 120/240V Single-Phase Steel Standby Generator with 100A 16-Circuit Automatic Transfer Switch

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  • Briggs & Stratton Sandby Generators
    Learn about the Briggs & Stratton Standby Generators and how the system works.
  • Why Buy A Home Standby Generator
    We are all aware of storms that can knock down powers to millions, or record snow falls that bring down trees and power lines. Not matter where we live the electrical grid effects everybody. Most of the grid was built 50 years ago and only had a 40 year life expectancy. Make sure your not left in the dark with a backup standby generator.

12 kW 120/240V Single-Phase Steel Standby Generator with 100A 16-Circuit Automatic Transfer Switch

Product Features:

  • 12kW of power will ensure your home will retain power through unexpected outages
  • Connects to existing liquid propane or natural gas fuel supply for easy and efficient power
  • 3 Year Residential Warranty
  • Enclosure made from galvanneal steel offers superior corrosion resistance
  • UL Listed to UL2200 Engine / Generator Standard for Safety
  • Automatic Transfer Switch Included: 100-Amp Service Entrance Rated ATS with 16 Circuit design allows for you to select priority circuits, rated for 100-Amps at 240-Volts
  • The Self-Test Mode periodically runs a self test to ensure that your generator will be ready to work when you need it


  • Briggs and Stratton OHV Engine: This V-twin, overhead valve commercial grade engine has been application engineered for power generation
  • Engine Displacement: 803cc
  • Engine RPM: 3600 (Revolutions per Minute)
  • Air Cooled
  • Covered Under 3 Year Residential Warranty
  • Includes Low Oil Alert and Automatic Shutdown

Product Technologies / Benefits:

  • Fully Automatic Standby: Advanced electronics detect when an utility power outage occurs and automatically starts the generator
  • Advanced Power Management: Briggs & Stratton automatic transfer switches can manage the load of up to two 4-ton air conditioner units
  • Low Natural Gas Pressure Requirements: This standby generator can operate at 3.5" to 7" water column

Product Specifications:

  • Overall Height: 38.5”
  • Overall Length: 34.6”
  • Overall Width: 39.4”
  • Product Weight: 535 lbs
  • NG Power Capacity: 11kW
  • LP Power Capacity: 12kW
  • NG Consumption (50% Load): 119 Cu.Ft. per hour
  • LP Consumption (50% Load): 1.42 Gallons per hour

Additional Briggs and Stratton Links

Our SKU: Briggs and Stratton 40345

This product is listed under the following manufacturer number(s):

*Denotes a finish or option that has been discontinued

Briggs and Stratton 40345 Product Specifications

Owner's Manual
Battery Info
Installation Sheet
Specification Sheet
Amperage 50
Auto Shut Off Yes
Battery Included No
Battery Type 550 CCA
CARB approved Yes
CC 803
Control Type Digital
Cooling System Air Cooled
Enclosure Material Galvanneal Steel
Engine Brand Briggs and Stratton OHV
Frequency 60
Fuel Type Liquid Propane, Natural Gas
Height 38.5
Length 34.6
Low Oil Alert Yes
Manufacturer Warranty 3 Year Residential, 3 Year Residential (Engine)
Motor RPM 3600
Mounting Pad Material Composite
Natural Gas Consumption 119
Phase 1
Transfer Switch Included Yes
UL Listed Yes
Voltage 120, 240
Wattage 12000
Width 39.4

Installation Resource Center

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