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Features
- B&S 20kW (LP) / 18kW (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
- 993cc Commercial-Grade Vanguard® Air-Cooled Engine
- Full-pressure lubrication system w/ spin-on oil filter
- Advanced debris management for enhanced durability
- Briggs & Stratton Alternator - Less Than 5% THD
- Improved frequency (HZ) regulation for cleaner power
- Automatic Voltage Regulation (+/-1%)
- Helps prevent damaging voltage spikes
- 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 - www.P65Warnings.ca.gov.
For more information go to: www.p65Warnings.ca.gov
Specifications
40586

Overview
Weight
489 Pounds
Made in USA
Yes
Consumer Warranty
5 Years
Product Style
Standby Generator
Product Length
50.5 Inches
Product Width
33.8 Inches
Product Height
31 Inches
UPC
011675405861
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Auto Voltage Regulation
Yes
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 ft³/hr
NG Fuel Consumption @ 100% Load
260 ft³/hr
LP Fuel Consumption @ 50% Load
2.24 gallons/hr
LP Fuel Consumption @ 100% Load
3.65 gallons/hr
Rated Amps
83.3 Amps
Decibel Rating @ 7m
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.
64
Transfer Switch
Automatic (Not Included)
Battery
Not Included (540 CCA)
Enclosure
Steel
Circuit Breaker Size
100 Amps
A/C Ton Rating
2 x 5-Tons
Mounting Pad
Steel (Included)
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Engine
Engine Brand
Briggs and Stratton Vanguard
Starting System
12v Auto Start
CC
993 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Reviews
(2)
Briggs & Stratton 40586 Reviews & Ratings

Manufacturer Review
New 20kW Generator
By Tim Land
Briggs & Stratton Territory Sales Manager
Review Posted 10/21/2019
From the #1 producer of gasoline engines in the world comes the next big thing in standby generators. Our new lines of standby generators offer a new upgraded control system that features multi-line text and graphics, programmable exercise times, and a low speed idle mode to save fuel and reduce noise. With a new AVR that communicates directly with the controller to optimize generator performance and deliver tighter voltage control. Our new three stage battery charger (bulk, absorption and float stages) ensures that your battery is always ready to start the engine when in need. The upgraded alternator delivers more motor starting capability allowing you to power more for less!
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Great Generator
By Jack H.
LUCEDALE, Mississippi
Review Posted 11/09/2020
Great generator. I purchased the generator 3 years ago. It's one of the best purchases that I've ever made. It has came in handy, especially this recent hurricane where we were without power for 6 days. I timed the number of hours (after a 100 hours it states to service the generator) so I cut it off after reaching 100 hours. My service technician came out and changed the oil for me and the oil looked as if it was still new. He advised me that I could have kept running it past the 100 hours that I could have just left it running and that it has a sensor if anything goes wrong. Anyway, I know that now. It did not miss a beat for days. Great product! Also, I have recommended the B & S to my neighbor and now he is purchasing one as well.
Jack H. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Durable, Exceeded Expectations, High Quality, Id Buy It Again
Cons:
None so far
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