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Model # 40484
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MSRP: $6,199.00
$4,499.00
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20kW Standby Generator With 150 Amp Automatic SE Transfer Switch By Briggs and Stratton 40484

  • Reliable Engine Power - Commercial Grade Vanguard Engines
  • Manage the loads of up to two air conditioners while powering other household appliances
  • ACCM Managed Whole House Power system
  • Includes 150 Amp Automatic Transfer Switch, Fully Automatic with Service Entrance Disconnect
  • Rust-resistant, Galvanneal steel enclosures
  • Automatically powers your home in seconds after sensing a power outage
  • Thermally protected fuel system which automatically shuts off the unit in the event of a fire
  • Featuring unique airflow technology, the standby generator's design pushes engine exhaust out the front of the unit and directly away from the house
  • 4 Year Limited Parts and Labor Warranty

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Details and Specifications


20kW Standby Generator With 150 Amp Automatic Transfer Switch By Briggs and Stratton

A standby generator from Briggs & Stratton provides your home with backup electrical power. The 40484 is a 20-kilowatt, air-cooled generator packaged with a 150-amp automatic transfer switch. Connected to your home's existing electrical system and gaseous fuel supply lines, the fully automatic generator system starts and runs automatically within seconds of a power outage, providing electrical power to keep families and homes safe.

Adherence to National Fire Protection Association safety rules and National Electrical Codes allow placement as close as 18 inches to a home, offering maximum installation flexibility, especially where lot lines are tight and yards are small. These standby generators carry a four-year, limited parts and labor warranty.

Engine

Briggs & Stratton powers the 40484 with its own popular and reliable Vanguard 993 cc V-Twin overhead valve engine. The electronic engine governor incorporated into the generator design keeps the Vanguard operating at a constant 3600 RPM, even under heavy and changing loads, to keep the AC signal constant at 60 hertz. The aircooled engine has a fullypressured lubrication system and oil cooler, with a lowoil pressure sensor that allows engine shut down to prevent damage.

Fuel

The 20kW standby unit is factory configured to run on natural gas, but converts easily to liquid petroleum gas (propane) during installation by simply turning a selector screw with an Allen wrench. Operating on LP gas provides up to 20 kW of power. At half-load, the engine consumes about 2.3 gallons of LP fuel per hour. Natural gas supplies up to 18 kW of power, and consumption runs about 83 cubic feet per hour at half load. Fuel consumption varies along with the electrical load and is affected by altitude and ambient temperature.

Backup Power

Standby generators are permanently installed appliances that operate automatically without intervention. A power outage is sensed immediately and after a short delay to prevent unnecessary starts during momentary outages, the engine is started and brought up to speed. The automatic transfer switch disconnects the home from the utility supply lines and connects it to the generator, effectively isolating the home from the electric utility.

The generator's controller continuously regulates the voltage and frequency to provide power that meets or exceeds electric-utility standards and is suitable for sensitive electronics in addition to lighting and appliance loads, including air conditioners.

Transfer Switch

The included 150-amp automatic transfer switch is a service entrance rated switch that includes the service disconnect. It installs indoors or outdoors and is typically placed between the electric utility meter and the main service panel. In this configuration, the switch controls the source of power to the main circuit breaker panel by selecting between utility power or generator power, which eliminates the need for additional subpanels and allows the generator to supply power throughout the home.

The air conditioning control module, or ACCM, allows the operation of two air conditioners. The ACCM "imprints" the starting current requirements of the air conditioners to prevent generator overload conditions and ensure the units only start when there is enough power available.

Options

The addition of a load control center adds a managed power option which allows the generator to supply power to all your home's high-voltage, high current appliances including dryers, hot water heaters, and well pumps.

Maintenance kits include everything necessary to keep your generator running and supplying power, even through extended outages with oil and air filters, filler funnel, and spark plugs. Cold weather kits add two oil warmers and a battery warmer for easier and more reliable starts in cold weather down to -25 Fahrenheit.

Add a wireless monitor and keep track of your generator from indoors and eliminate trips outside during inclement weather.

Appearance

The exterior cabinet is made from rustresistant Galvanneal steel and painted in a process similar to that used by the automotive industry for years of corrosion- free use. It rests on a prepared gravel bed or concrete pad, is 47 inches wide and 29 inches deep. At just 69db, the generator produces noise similar to a central air conditioning unit.

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Product Specifications

Model
Model Number 40484
Manufacturer Briggs & Stratton
Rated Watts 20kW LP/18kW NG
Rated Amps 83.3 LP/75 NG
Voltage 120/240V Single Phase
A/C Ton Rating 2/5 Ton
Enclosure Galvaneal Steel
UL Listed Yes
Decibel Rating 69 dBA
Features
Starting System Automatic
Low Oil Alert Yes
Hour Meter Yes
Battery Requirement Group 26, 12V, 540CCA
Mounting Pad Included
Product Weight 500 lbs.
Shipping Weight 643 lbs.
Dimensions (Inches) 48L x 34W x 31H (BASE 50.5 x 32.9)
Engine
Engine Brand Vanguard V-Twin
Engine Size 993 cc
Engine RPM 3600
Cooling System Air Cooled
Alternator
Alternator Type Brushed, Computer Friendly
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel
Fuel Type LP/NG
NG Power Capacity 18kW
LP Power Capacity 20kW
NG Consumption @ Full Load 260 cu.ft/hr
NG Consumption @ 1/2 Load 187 cu.ft/hr
LP Consumption @ Full Load 3.75 gal/hr
LP Consumption @ 1/2 Load 2.31 gal/hr
Transfer Switch
Transfer Switch Model 71069
Transfer Switch Amps 150 Amps
Transfer Switch Circuits Whole Panel Service Entrance Disconnect
ATS Poles 2 Pole
Warranty Information
Consumer Warranty 4 Year Limited Parts and Labor
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Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

Some restrictions apply to "Free Shipping" you may either view our
Shipping Information page or contact us for details.