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Briggs & Stratton 40531 - 12kW Standby Generator System (200A Service Disc. + Power Mgmt.) for sale.

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Briggs & Stratton 12kW Standby Generator System (200A Service Disc. + Power Mgmt.)

Briggs & Stratton Power Equipment and Accessories
Model: 40531
(Based on expert analysis, manufacturer ratings and customer reviews)
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
3 Reviews
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  • Features
  • Specs
  • 2
  • 3
  • Articles
  • Shipping
  • Accessories
Run Watts
Rated Watts
120/240 Single-Phase

Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Briggs & Stratton's New 12kW Home Standby Generator System
Automatically powers your home is seconds after sensing an outage

Streamlined, Space-Saving Design In A Quieter Package
Enclosure is 50% smaller and limits sound pressure to 69 dB(A)

200-Amp Service Entrance Rated Automatic Transfer Switch (71068)
Power all circuits without a sub-panel; Rated at 200-Amps @ 240-Volts
NEMA 3R Indoor/Outdoor enclosure for mounting location flexibility

Symphony® II Power Management (Up To 8 High-Wattage Loads)
Automatically manages & balances loads while preventing overload
Uninterrupted, whole house power, with a smaller generator

627cc Briggs & Stratton Commercial-Grade Vanguard™ Engine
Premium sintered iron cylinder sleeves for improved heat transfer
Full lubrication w/ spin-on oil filter cleans oil & protects engine components

Brushless Alternator (Less Than 5% THD)
Provides clean, safe power that won't harm computers or electronics

Automotive-Grade Galvaneal Steel Enclosure To Resist Rust
Adv. powder coat paint process for protection from the elements

Exclusive Front Exhaust Design For Flexible Placement
Can be placed as close as 18” from structure* (Verify Local Building Codes)

Industry Leading 5-Year Parts, Labor & Travel Warranty
Engine Brand
Briggs and Stratton Vanguard
Starting System
12v Auto Start
627 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Surge Watts
10000 Watts
Rated Watts
12000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
10000 Watts
LP Power Capacity
12000 Watts
NG Fuel Consumption @ 50% Load
117 (BTU: 117,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
1.7 (BTU: 154,275 BTU/HR) gallons/hr
Rated Amps
50 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
69 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
Not Included (540 CCA)
A/C Ton Rating
2 x 4-Tons
Mounting Pad
Steel (Included)
Transfer Switch Style
Service Disconnect
ATS Load Prioritizing
ATS Load Shedding
ATS Poles
2 Poles
ATS Service Disconnect
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
Assembly Required
318 Pounds
Product Style
Standby Generator
Product Length
25 Inches
Product Width
28 Inches
Product Height
37.2 Inches
Consumer Warranty
5 Years
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  2 Questions
Q: Oh Mike I forgot to ask you which generator is one of the better to buy Generac Briggs & Station or is there another that you may suggest.
by Barry Heintz from Michigan on June 27, 2016

A: I would recommend going with the Kohler if you are looking for a generator that has slightly cleaner power and transfer from utility to generator power quicker.

by Mike, Product Expert
Q: Hi Mike.
I have about a 1800 squ. ft house that is well insulated. I have a geo thermal heat pump for furnace and ac. I also have 2 pellet stoves one up stairs and one down stairs. I have a well that is 54 ft. deep and is run by a 3/4 horse motor. I also have ham radio gear that I would like to be abele to run. I also have 2 refrigerators a electric stove an 80 gallon hot water heater and an electric dryer. If I do not use the geo thermal heat pump what size generator will I need to run the house? I was thinking I could get away with a 12k generator.

by Barry Heintz from Michigan on June 27, 2016

A: In regards to your question, proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications that are commercial, all-electric homes, have heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems.

by Mike, Product Expert
Briggs & Stratton 40531 Reviews & Ratings
Overall Rating
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
I'd Buy It Again (1)
Reliable (1)
Price (1)
Durable (1)
None to display.
100% of respondents would recommend this product to a friend
3 Reviews  Sort by 
Eric E.
Enfield, NH
Purchased from Power Equipment Direct
Purchased 11/30/16
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Standby Generator
This was the third one of these I have purchased and installed. One on my nephews home, one on my brothers home and now one on my home. Great product, quality built and a great company to purchase from, they are there to help you make the correct purchase for your needs. Big piece of mind when I am working out of town knowing if we loose power my wife will have no problems
Pros: Durable, Price, Reliable, I'd Buy It Again
Eric Recommends This Briggs & Stratton Product
Manufacturer Response
Brand Rep
Thank you so much for your positive review of our standby generator! We're focused on delivering a system that is easy for you to install and service and for your customer to enjoy - and now you personally! Can't wait to hear how you weather the first outage!
Eric's Experience With Power Equipment Direct
Web Site


"Great to work with. My generator was on backorder and not expected to ship for 2 week but they were able to work with their distributer to get it sooner."
Was this review helpful?
Ronald S.
Alger, MI
Purchased from Power Equipment Direct
Purchased 12/15/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
99% Satisfied
The 12KW unit was delivered as expected in good shape and well packaged. I had a local plumber hook up the NG line and a local electrician hook up the 12KW unit integrated to existing service line including the transfer switch and generator. It fired up on the first try and functioned as expected. I had a simple function monitor installed inside the house and wired back to the control panel of the GenSet but it would not work. The electrician said to call B & S tech support so I did and... more
Ronald Recommends This Briggs & Stratton Product
Ronald's Experience With Power Equipment Direct
Web Site


"There was a slight misunderstanding on the delivery date from EGD but later found out that the unit purchased was not being shipped from them but from the B & S factory in Wisconsin. EGD should only quote delivery as promised from the source."
Was this review helpful?
Ron S.
Manchester, MI
Purchased from Power Equipment Direct
Purchased 3/10/16
5 out of 55 out of 55 out of 55 out of 55 out of 5
Fired Up First Time
Installation instruction good making it fairly easy to install. It fired up first time during testing and picked up the house load. Symphony transfer switch neutral block placement is inconvenient for large cables. My electrician felt it should be near the top of the box.
Ron Recommends This Briggs & Stratton Product
Manufacturer Response
Brand Rep
Hello Ron!

Congrats on owning what we feel is one of the best generator systems on the market! This 12kW generator partnered with Symphony II Power Management packs a big punch in a small package.

We hope you enjoy the luxuries of never losing power again - and being the envy of your neighbors!

Best Regards,

The Briggs & Stratton Standby Team
Was this review helpful?
Free Freight
  • Ships via Semi-Truck
  • Curb Side Delivery
  • Free to Lower 48 States
  • Standard Rates to Alaska, Hawaii
We currently CANNOT ship this product to Canada or any destination outside of the United States
Lift Gate Services
  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • Free Lift Gate
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Buy Briggs & Stratton 12kW Standby Generator System (200A Service Disc. + Power Mgmt.) at Power Equipment Direct. Read reviews and articles. Wide Selection of accessories available, including Briggs & Stratton 10 kW & 12 kW Standby Generator Maintenance Kit (Vanguard Engine), Briggs & Stratton Standby Generator Remote System Status Panel and Briggs & Stratton Symphony® II 200-Amp Automatic Transfer Switch For Liquid-Cooled Models (Service Disconnect).

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