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Briggs & Stratton 40396 - 20kW Standby Generator System (400A Split Service Disconnect + AC Shedding) for sale.

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Briggs & Stratton 20kW Standby Generator System (400A Split Service Disconnect + AC Shedding)

Briggs & Stratton Power Equipment and Accessories
Model: 40396
(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
7 Reviews
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  • Features
  • Specs
  • 2
  • 7
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  • 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."

First In Its Class: Never Seen Before Transfer Switch Technology
Only compatible with Briggs & Stratton generators

400-Amp Service Entrance Auto Transfer Switch (71057) (NEMA 3R)
A UL Listed solution for 2 x 200-Amp Service Breakers
Easy install - one less switch, less wiring/time, fewer expenses

Smaller Transfer Switch
A cost effective, cleaner looking installation

Patented Central Air Technology Using Symphony II Transfer Panel
Manages demands of up to two 5-ton central air conditioners
Intelligently powers your whole home (load dependent)

993cc Briggs & Stratton V-Twin Commercial Grade Vanguard Engine
Provides years of long lasting, reliable standby power

Galvanneal Steel Enclosure w/ Front Air Ventilation
Automotive rust proofing paint process reduces corrosion
Pushes engine exhaust out the front, away from the home
Flexible Placement (Please Verify Local Building Codes)

Tested against tough National Fire Protection Agency standards
Can be placed as close as 18” from structure
Turnkey Extras: Auto Battery Charger & Hour Meter

Industry Leading 5-Year Parts, Labor & Travel Warranty
Engine Brand
Briggs and Stratton Vanguard
Starting System
12v Auto Start
993 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Rated Watts
20000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
18000 Watts
LP Power Capacity
20000 Watts
NG Fuel Consumption @ 50% Load
187 (BTU: 187,000 BTU/HR) ft³/hr
NG Fuel Consumption @ 100% Load
260 (BTU: 260,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
1.97 (BTU: 178,778 BTU/HR) gallons/hr
LP Fuel Consumption @ 100% Load
3.75 (BTU: 340,313 BTU/HR) gallons/hr
Rated Amps
83 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
Not Included (540 CCA)
A/C Ton Rating
2 x 5-Tons
Mounting Pad
Steel (Included)
Transfer Switch Style
Service Disconnect
ATS Load Prioritizing
Sold Separately
ATS Load Shedding
ATS Service Disconnect
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
500 Pounds
Product Style
Standby Generator
Product Length
50.5 Inches
Product Width
32.9 Inches
Product Height
31 Inches
Consumer Warranty
5 Years
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  2 Questions
Q: How does this unit handle load management? I have two AC units and a couple high-wattage appliances. Would I require additional load modules, or can it manage six loads (more if bundled) out of the box as I've been told?

Also, someone told me that the ATS amperage has to match the service amerage. I have 300a service (150x2), so the statement suggested I can't use the 400a ATS of this unit. Is there any veracity to this claim? Thanks a lot.

by KL from New Jersey on November 18, 2013

A: The unit (40396) by itself is set to handle up to 2 standard AC units with its ACCM technology, but if you want to add additional large wattage loads you would need to get their Load Control Center (Command Central™) which can handle up to 4 additional large load items.

Command Central - Load Control Center

Typically yes, the transfer switch amperage needs to match the incoming utility amperage. However, some local codes allow a larger transfer switch since the switch is a pass through device while you are on utility service where your main breaker is the safety device for your electrical system. You will need to check with your local inspector or AHJ (Authority Having Jurisdiction) to see if they will allow it.

If that is not an option then then suggestion would be the purchase the Generac 20kW model 6250 and then their 300A ATS which has built-in load shedding with the only additional items required to manage the other loads (other then AC) would be the PMM modules - (1) 6199 & (3) 6186.

Generac Model 6250

Generac Model RTSY300A3 - 300A ATS

Generac Model 6199 - PMM With 24V Start Kit (1 Required if adding any additional load controls)

Generac Model 6186 - PMM Only (Up To 3)
by Mike, Product Expert
Q: I need a 20kW natural gas generator. But they seem to only come with a 200A panel. I believe I need a 300A panel. Is there a big price difference in purchasing a 300A panel with the generator? I didn't see it on your website. Can you tell me the price?

by Peter Kearns from New Jersey on July 13, 2013

A: If you have a specific application that does not meet the prepackaged units you would purchase the items individually instead. The packaged systems are put together by the appropriate manufacturer and cannot be altered.

Briggs does not offer a 300A switch so you would need to go to the larger 400A switch if you intend on powering the entire home and that system is already prepackaged. (Model 40396).

Generac does offer a 300A switch so you would purchase the generator by itself (Model 6250) and the switch separately (Model RTSY300A3). Just add each item to the cart and enter your state and zip for the total.

We do recommend consulting with a certified electrician for proper generator sizing and installation.

by Mike, Product Expert
Briggs & Stratton 40396 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
Easy To Use (2)
Exceeded Expectations (2)
Price (1)
Durable (1)
Reliable (1)
None to display.
100% of respondents would recommend this product to a friend
7 Reviews  Sort by 
manufacturers review image

Christin Wam
Channel Manager
From The Manufacturer
Includes Our Exclusive Duall 200/split 200 Amp Transfer Switch!
Many luxury homes, up to 14,000 square feet with 5-ton air conditioners, require a generator as large as a 20kW. One feature that also accompanies a larger home like this is a 400 Amp service panel which requires a 400 Amp transfer switch. Briggs & Stratton is the only manufacturer to offer a Dual 200 Amp transfer switch to meet these needs.

Why is a Dual 200 Amp Transfer Switch better than a traditional 400 Amp Transfer Switch? There are many reasons:
- Saves you a significant amount... more
View Image
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James B.
Chelsea, AL
Total Reviews
2 Reviews
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Solid Product
We purchased this in July 2016

The generator has been great, the electrician had some trouble with the ATS because the manual had not been updated and our Load shedding modules all stayed off initially (the ATS was set to think the Gen was only 2KW instead of 20KW) It was a quick fix and it has performed very well, exercises each week at its set time. On power loss the gen starts up within a min and all loads not on load shed start up immediately upon ATS activation. The Load shedding... more
Pros: Easy To Use, Exceeded Expectations, Reliable, I'd Buy It Again
James Recommends This Briggs & Stratton Product
Manufacturer Response
Brand Rep
Thank you so much for your great review! Your home is a perfect example of a larger home with quite a few electric needs, and with our power management system you can truly power more for less. You'll be the envy of the neighborhood when power goes out and you're still lights on.

Thank you for the feedback on what you don't like as well - we'll take that back to our team!
Was this review helpful?
Athens, TN
Purchased from Power Equipment Direct
Purchased 1/28/13
Total Reviews
2 Reviews
Total Helpful Votes
70 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
B&s Backup Generator
The generator arrived in great condition, well packed and shrink wrapped. The installation went very smooth and there were no issues. The two electricians who installed the generator were very complimentary about the product and the ability to meet the needs. I had previously ordered a smaller generator and had to return it. I have a five ton AC, water well, all electric home (3000 sq. ft.) and everything can be operated. I have 400amp service coming into my home with two 200amp panels. ... more
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Charlestown, IN
Purchased from Power Equipment Direct
Purchased 11/1/13
Total Helpful Votes
23 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Briggs 20kw 400 Amp Transfer Switch
I installed this generator and transfer switch in May 2014, worked through the only bug I had of not setting the dip switches as the manual clearly stated (my bad). Every week the generator ran through the exercise cycle as supposed to. Last week, power failed due to a storm, we waited about 10 seconds, and the generator started and supplied power as expected. It was nice to have the whole house running, while every home around us sat in the dark. We have 4,800 sq.ft. all electric home with two... more
Pros: Durable, Easy To Use, Price, Exceeded Expectations
David Recommends This Briggs & Stratton Product
Was this review helpful?
Jerry M.
Athens, TN
Purchased from Power Equipment Direct
Purchased 1/28/13
Total Reviews
2 Reviews
Total Helpful Votes
70 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Product
I live in East Tennessee, and we have a lot of power outages. After losing power during my mother-in-laws 80th birthday party, I decided that I needed backup power.

I selected the B&S with the split service to that I could run my whole house. I used a local electrician for the installation. It has worked flawlessly for the past three years.

It starts automatically within 6-10 seconds, and I have never had a single issue. During this time, we have lost power 10-20 times.
Jerry Recommends This Briggs & Stratton Product
Mike, the Generator Expert
Product Expert
That's a lot of power outages! Glad to hear it's working out so well for you.
Was this review helpful?
Greg C.
Pineville, LA
Purchased from Power Equipment Direct
Purchased 4/30/15
Total Helpful Votes
13 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Easy And Quick
Purchased a B&S 20kW generator with the dual 200A transfer switch. The generator was easy to purchase with quick delivery. I also purchased the load shed modules from them, and that was easy and quick also. I would not hesitate to use again.
Greg Recommends This Briggs & Stratton Product
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Tom M.
Chuluota, FL
Purchased from Power Equipment Direct
Purchased 3/21/16
5 out of 55 out of 55 out of 55 out of 55 out of 5
Briggs & Stratton 20kw Standby Generator System
I installed this unit in April 2016. Installation went smoothly with no issues. The dual (400A Split Service) was exactly what I needed and this was the only unit I found with that feature. Installation with one electrician took about 6 hours. It replaced a previous unit so I already had a pad and propane feed. I elected to keep the factory setting for weekly run. During hurricane Matthew, I lost grid power for four days but only was out for the time it took for the generator to kick in... more
Tom Recommends This Briggs & Stratton Product
Manufacturer Response
Brand Rep
I'm not sure how I missed this review earlier, but what a great testament of how Briggs & Stratton helped you weather the storm! Thank you so much for your great review. The Dual 200 is a great transfer switch that is exclusive to us, delivering a cost effective solution to handle a split 400 amp service.

Again, sorry we missed this review but we sincerely want to thank you for letting us know how we helped in such extreme power loss scenarios! Thanks Tom!
Was this review helpful?
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We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
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  • Safely Lowers Products Off the Truck
  • Requires Special Hydraulic Lift
  • Free Lift Gate
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Buy Briggs & Stratton 20kW Standby Generator System (400A Split Service Disconnect + AC Shedding) at Power Equipment Direct. Read reviews and articles. Wide Selection of accessories available, including Briggs & Stratton 15 - 20 kw Standby Generator Maintenance Kit, Briggs & Stratton Symphony® II High Voltage (50A) Remote Module for Home Standby Generators and Briggs & Stratton Air-Cooled Standby Generator Cold Weather Kit (16 & 20kW).

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