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12kW1 Standby Generator with 100 amp-16 Circuit Automatic Transfer Switch

Model Number: 040345

Turn on the performance with our Briggs & Stratton 12kW1 home generator system. Its streamlined design meets the power needs of your whole house, with a more compact, affordable unit. The 12kW1 is ideal for medium-sized houses.

MSRP: $3,199.00

Learn more about this unit (PDF)

PlugPlugEssential Power-Plus!
Essential Power - Plus! provides power for a select number of circuits as well as powering up to two air conditioners. Essential Power - Plus! is available on the 10kW1-20kW1 standby generators with a 100 Amp, 16 Circuit transfer switch. Learn what you can power with the 16 circuit transfer switch!

Product Ratings

  • Did you know that each week, 3.5 million Americans will experience a power outage in their home? Watch this video to learn about the benefits of owning a standby generator!

  • Streamlined Space Saving Design

    Its sleek, compact profile blends in beautifully with your home's exterior and landscaping, much like your central air conditioner.

  • Natural Gas Pressure Requirements

    Rated for operation in areas with low natural gas pressure. This standby generator can operate at 3.5'' to 7'' water column.

  • Durable Outdoor Enclosure

    Galvaneal steel provides years of rust proof, outdoor protection--perfect for extreme weather conditions.

  • Limited 3 Year Parts and Labor Warranty2

    Your Briggs & Stratton guarantee of quality and performance – one of the best in the industry.

  • Briggs & Stratton Engine

    Application-engineered to stringent specifications, these premium Briggs & Stratton engines will provide years of long-lasting, reliable standby power.

  • Turnkey Extras

    Systems include a battery charger, hour meter, and installation base.

  • Availability

    This standby generator is available for sale in all 50 states.

1This 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).
2Warranty details available at
3Installations must strictly comply with all applicable codes, industry standards, laws, regulations and provided installation manual. Running engines give off carbon monoxide, an odorless, 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.
Not for prime power or use where standby systems are legally required, for serious life safety or health hazards, or where lack of power, hampers rescue or fire-fighting operations.

12kW1 Standby Generator with 100 amp-16 Circuit Automatic Transfer Switch
Running Watts (LP) 12000
Running Watts (NG) 11000
Engine Brand Briggs & Stratton
Engine Series Professional Series™
CC 803
Operation Fully Automatic
Voltage (V) 120/240
Alternator Type Brushless, Computer-friendly
Fuel Consumption (Cubic Feet per Hour @ 1/2 Load) 1.42gal/hr (LP Vapor) 119ft3/hr (NG)
Fuel Consumption (Cubic Feet per Hour @ Full Load) 2.36gal/hr (LP Vapor) 119ft3/hr (NG)
Weekly Exerciser Yes
Battery/Battery Charger Yes
Overcrank Protection Yes
Hour Meter Yes
Diagnostic Alerts with Remote System Status Low Oil Shutdown, Engine Does Not Start, Low Frequency, Engine Overspeed, Low Voltage, Low Battery Voltage, Oil Temp High, Transfer Switch Fault
Length (in) 34.6
Width (in) 39.4
Height (in) 38.5
Weight (lbs) 535
Warranty (Product) 3 Year Limited Parts and Labor
BTU's/Hour @ 1/2 load 102,000 (NG)

*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.

Maintenance Kit

Briggs & Stratton maintenance kits help you complete scheduled and preventative maintenance on your standby generator. The maintenance kit contains oil and air filters, synthetic oil and spark plugs.

12kW1 Remote System Status Panel

Receive diagnostic alerts from inside the comfort of your home from the hardwired panel. Alerts include: Low Oil Shutdown, Engine Does Not Start, Low Frequency, Engine Overspeed, Low Voltage, Low Battery Voltage, Oil Temp High, Transfer Switch Fault.

10-12kW1 Cold Weather Kit Help ensure smooth starting and reliable operation in the winter months with the Briggs & Stratton Cold Weather Kit tested to start at -20° F. The thermostatically controlled battery warmers and oil heaters activate as the temperature drops. The 10kW1 (6030A) kit includes a battery warmer and an oil heater. View Generator Accessory
Standby Generator Automatic Transfer Switch

100 Amp 16 Circuit Transfer Switch

The 100 amp, 16 circuit automatic transfer switch provides power for select number of circuits. Featuring our patented Air Conditioning Control Module (ACCM), the 100 amp, 16 circuit transfer switch manages the load of 1 or 2 air conditioners while keeping household appliances powered. Flexible, indoor /outdoor transfer switch placement makes …

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