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Briggs & Stratton Smart Circuit Standby Generator System w/ 400-Amp (2x200A) Service Entrance ATS (20kW LP/18kW NG)

Briggs & Stratton Electric Generators and Accessories
Model: 40305PACK-D
(Based on expert analysis, manufacturer ratings and customer reviews)
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  • Features
  • Specs
  • 4
  • Reviews
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Run Watts
Rated Watts
120/240 Single-Phase
First In Its Class: Never Seen Before Transfer Switch Technology
Only compatible with Briggs & Stratton generators

Smaller Transfer Switch
A cost effective, cleaner looking installation

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

400-Amp (2 x 200A) Service Entrance Auto Transfer Switch (71058)
A UL Listed solution for 2 x 200-Amp Service Breakers
Easy install - one less switch, less wiring/time, fewer expenses

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

Sound Shield™ Technology
Ensures ultra-quiet, neighbor-friendly operation (Only 68 dB)

Galvanized Steel All-Climate Enclosure
Military grade paint provides a finish that reduces corrosion

Composite Mounting Pad
Reduces installation time, no need for costly concrete pad

Also Includes: Auto Bat. Charger, Synthetic Oil and Hour Meter

4-Year Limited Warranty (Parts & Labor)
Engine Brand
Briggs and Stratton Vanguard
993 CC
Consumer Engine Warranty
4 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Surge Watts
20000 Watts
Rated Watts
20000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
18000 Watts
LP Power Capacity
20000 Watts
NG Fuel Consumption @ 50% Load
160 (BTU: 160,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
1.95 (BTU: 176,963 BTU/HR) gallons/hr
Rated Amps
83 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
68 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
Not Included (350 CCA)
A/C Ton Rating
2 x 5-Tons
Mounting Pad
Composite (Included)
Transfer Switch Style
Service Disconnect
ATS Load Prioritizing
ATS Load Shedding
ATS Service Disconnect
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
700 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
33 Inches
Product Height
30.5 Inches
Consumer Warranty
4 Years
  4 Questions
Q: Jim, What size gas line do I need to provide? What is the size of the hook up on this Gen. Do I need a flex line to hook it up to the shut off outside? Jim
by Jim from Pennsylvania on January 30, 2012

A: This unit has a 3/4 inch fuel inlet connection and comes with a piece of flexible fuel line that attaches the generator to the fixed piping.

The installation guide on the product page under the specs link shows the pipe sizing chart which is based on distance from the fuel source and needs to be followed. If you do not follow this chart you can easily flood or starve the engine.

Briggs 40305PACK-D

by Mike, Product Expert

Q: Jim, with the 20kw 400 amp set up is there anything else that I would need to purchase or may want? (other than the warmer.)

by Jim from Pennsylvania on January 25, 2012

A: You would want to get the cold weather kit to go with the unit, model 6030A for temperatures that drop below 32 degrees F.

Other then that you only need to have your installer provide a battery, all the wiring, gas lines and a solid base such as crushed stone, pea gravel or concrete.

Briggs Cold Weather Kit

by Mike, Product Expert

Q: Jim, I was wondering I have a homeowner who has a 100 gal propane tank on site. Is the tank that he has large enough to power a 20kw generator.
by Jim from Pennsylvania on January 20, 2012

A: A 100 Gallon tank will work with a 20kW generator, however, your customer is not going to get much backup time.

The B&S 20kW generator uses 1.95 Gal/Hr at 50% load output so your customer may only get 2 days total.

Most manufacturers recommend at least 200 Gallons of available generator fuel for long term outages.

by Mike, Product Expert

Q: Jim, looking to buy a whole house system, two Geo thermal heat and air systems and two hot water heaters. two, 200 amp service in the house. As long as I can run the down stairs heat and air we would be fine, plus one hot water. Will be running LP as fuel source.
by Mark Applin from Kentucky on January 04, 2012

A: 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.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps and voltage. 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.

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

by Mike, Product Expert

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Shop for the Briggs & Stratton Smart Circuit Standby Generator System w/ 400-Amp (2x200A) Service Entrance ATS (20kW LP/18kW NG) at Electric Generators Direct. Research Briggs & Stratton standby air-cooled generator online. Find Briggs & Stratton 40305PACK-D standby air-cooled generator & briggs 18 kw natural gas standby generator package 400-Amp ATS features and specifications.