Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
Briggs & Stratton 40590
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Briggs & Stratton 12kW Home Standby Generator (Steel)



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Lift Gate
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Free Shipping & Lift Gate
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
Estimated Availability April 06, 2021
Shipping to60601
Shipping Details
  • Free to Lower 48 States
  • Lift Gate Service Available - Free Lift Gate Learn More
*We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
$53 / Month
With our 82 months 10.99% APR*
82 fixed monthly payments required.
Available Add-Ons
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Lift Gate Service
All products weighing more than 100 lbs. ship via semi-truck. We recommend ordering the Lift Gate Service to safely lower the product to the curb. If you have a loading dock or forklift, you do NOT need a Lift Gate service. If you are a residential customer, you must have at least 2-4 able-bodied people present to unload the product. Learn More
Learn More Installation
Briggs & Stratton 12kW Home Standby Generator (Steel)
Briggs & Stratton 12kW Home Standby Generator (Steel)
Model: 40590
How-To Articles





Standby (Air Cooled)

Run Watts

12,000 Rated Watts


120/240 Single-Phase


LP/Natural Gas


Briggs and Stratton OHV
  • B&S 12kW (LP) / 10.8kW (NG) Air-Cooled Standby Generator
  • Automatically powers your home in seconds after sensing an outage*
  • Runs on Natural Gas (NG) or Liquid Propane (LP)
  • Simple field conversion for easier installations
  • 627cc Commercial-Grade Vanguard® Air-Cooled Engine
  • Full-pressure lubrication system w/ spin-on oil filter
  • Advanced debris management for enhanced durability
  • Premium Mecc Alte Alternator - Less Than 5% THD
  • Improved frequency (HZ) regulation for cleaner power
  • Capable of starting most 5-Ton central AC units
  • Automatic Voltage Regulation (+/-1%)
  • Helps prevent damaging voltage spikes
  • *Symphony® II Power Management (Up To 8 High-Wattage Loads)
  • Uninterrupted, whole house power, with a smaller generator
  • Flexible Placement (Please Verify Local Building Codes)
  • Tested against tough National Fire Protection Agency standards
  • Can be placed as close as 18" from structure
  • New Upgraded Control System
  • LCD display w/ multi-line text graphics
  • Low Idle mode for quieter exercise
  • Independent 3-Stage Battery Charger
  • Provides optimized charge for longer battery life
  • Automotive-Grade Galvaneal Steel Enclosure
  • Helps minimize corrosion & protects it from the elements
  • 5 Year Limited Best in Class Warranty
  • Covers parts, labor, and travel for 5-Years
  • Assembled & Engineered In The USA
  • From foreign and domestic parts
  • Requires (Sold Separately)
  • Briggs & Stratton Automatic Transfer Switch* & Battery
California residents see
WARNING: Cancer and Reproductive Harm -
For more information go to:


Product Specs
120/240 Single-Phase
60 Hertz
Rated Watts
12000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
10800 Watts
LP Power Capacity
12000 Watts
NG Fuel Consumption @ 50% Load
116.9 ft³/hr
NG Fuel Consumption @ 100% Load
171.6 ft³/hr
LP Fuel Consumption @ 50% Load
1.68 gallons/hr
LP Fuel Consumption @ 100% Load
2.26 gallons/hr
Rated Amps
50 Amps
Decibel Rating @ 7m Learn More
Decibel Rating @ 7m
Sound levels are measured in decibels (dB). The lower the decibel rating, the less noise the product makes. As an example, a ticking watch is 20 dB while on the other end of the scale, a lawn mower is around 90 dB.
Transfer Switch
Automatic (Not Included)
Not Included (600 CCA)
Circuit Breaker Size
60 Amps
A/C Ton Rating
Mounting Pad
Steel (Included)
Cooling System
Air Cooled
UL Listed
Grade Type
Engine Brand
Briggs and Stratton OHV
Starting System
12v Auto Start
627 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
361 Pounds
Made in USA
Consumer Warranty
5 Years
Product Length
28 Inches
Product Style
Standby Generator
Product Width
26.1 Inches
Product Height
37.2 Inches


Briggs & Stratton 40590 Reviews & Ratings

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Required Accessories 9
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Optional Accessories 10

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