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Features
Grade
Emergency
Style
Standby (Air Cooled)
Run Watts
12,000 Rated Watts
Voltage
120/240 Single-Phase
Fuel
LP/Natural Gas
Engine
Briggs and Stratton OHV
- B&S 12kW (LP) / 10.8kW (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
- 627cc Commercial-Grade Vanguard® Air-Cooled Engine
- Full-pressure lubrication system w/ spin-on oil filter
- Advanced debris management for enhanced durability
- Premium Mecc Alte Alternator - Less Than 5% THD
- Improved frequency (HZ) regulation for cleaner power
- Capable of starting most 5-Ton central AC units
- Automatic Voltage Regulation (+/-1%)
- Helps prevent damaging voltage spikes
- *Symphony® II Power Management (Up To 8 High-Wattage Loads)
- Uninterrupted, whole house power, with a smaller generator
- 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
40590

Overview
Weight
361 Pounds
Made in USA
Yes
Consumer Warranty
5 Years
Product Style
Standby Generator
Product Length
28 Inches
Product Width
26.1 Inches
Product Height
37.2 Inches
UPC
011675405908
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Rated Watts
12000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
10800 Watts
LP Power Capacity
12000 Watts
NG Fuel Consumption @ 50% Load
116.9 ft³/hr
NG Fuel Consumption @ 100% Load
171.6 ft³/hr
LP Fuel Consumption @ 50% Load
1.68 gallons/hr
LP Fuel Consumption @ 100% Load
2.26 gallons/hr
Rated Amps
50 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.
69
Transfer Switch
Automatic (Not Included)
Battery
Not Included (600 CCA)
Enclosure
Steel
Circuit Breaker Size
60 Amps
A/C Ton Rating
4-Tons
Mounting Pad
Steel (Included)
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Engine
Engine Brand
Briggs and Stratton OHV
Starting System
12v Auto Start
CC
627 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Reviews
(5)
Briggs & Stratton 40590 Reviews & Ratings
Does What It's Supposed To Do
By SM
Tennessee
Review Posted 04/02/2023
We’ve never had a problem with this 40590 Generator. We have a 16 Ch. Briggs and Stratton ATS wired with it. I just sit around Sunday at 8pm and listen to it doing the automatic exercise for 5 minutes. Not too loud and a space saver!
SM Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Easy To Use, Price, I'd Buy It Again, Easy To Store
You Will Need This
By Steve M.
Costa Mesa, California
Review Posted 03/03/2021
I have had the 12 kw model for three years it powers my 4400 sq ft home in California entirely. It’s small footprint is perfect. Cycles once a week. No problems.
Steve M. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
High Quality, Durable, Exceeded Expectations, Reliable
Cons:
Heavy

Excellent Generator
By Steve H.
Mount Vernon, South Dakota
Purchased 02/01/2021 |
Review Posted 02/24/2021
I am an Electrician, I work on different brands of generators. Briggs & Stratton is the best.
Steve H. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
High Quality, Durable, Exceeded Expectations, Reliable

The Best Of The Best
By Howard C.
CASEYVILLE, Illinois
Purchased 06/09/2020 |
Review Posted 07/22/2020
The generator arrived as described. The hook up was easy and performance is great.
Howard C. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Features, Easy To Use, Fast, High Quality

Lots Of Power While Keeping It Simple!
By Christopher A.
Sumter, South Carolina
Purchased 05/10/2020 |
Review Posted 06/02/2020
I wanted a generator that was stripped down to just provide reliable power - didn't want or need any complicated electronics that could cause problems later. The access for maintenance is easy and the unit's design pretty much has a roof with an overhang protecting the unit. Just what I was looking for.
Christopher A. Recommends This
Was this review helpful?
Rating Breakdown
5/5
5/5
5/5
5/5
Pros:
Durable, Price, High Quality, Id Buy It Again
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