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The generac Centurion™ 5813 - 20kw standby generator system (aluminum enclosure) has been discontinued and is not available for purchase at this time.

Generac Centurion™ 5813 - 20kW Standby Generator System (Aluminum Enclosure)

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Centurion Electric Generators and AccessoriesModel: 5813
(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
9 Reviews
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  • Features
  • Specs
  • 1
    Q&A 
  • 9
    Reviews
  • Articles
  • Accessories
Grade
Airooled Standby Generators
Style
Watts
20 kW
Rated Watts
Voltage
120/240 Single-Phase
Fuel
Engine
Small Whole House Protection
Capable of powering a small house with one 5-ton central a/c
Runs off natural gas or LP fuel

Includes 200-AMP ATS (RTSN200A3)
Provides backup power to all circuits in your load center
NOT compatible with new Digital Load Management (DLM)

Generac OHVI Engine
Powerful and reliable air-cooled V-twin engine

Electronic Governor
Maintains precise control of engine speed & electrical frequency

Whisper-Test™ Low Speed Exercise Mode
Engine runs at reduced speed during exercise cycles
Exercises at a quiet 60 decibels at 23 feet
Sound level comparable to an idling car

Aluminum Enclosure
Corrosion-resistant material ideal for salty air conditions
Sound attenuated acoustically designed enclosure

Built-in Battery Charger
Battery Sold Separately
Engine
Engine Brand
Generac
HP
36 HP
CC
999 CC
Consumer Engine Warranty
3 Years
Commercial Engine Warranty
3 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Product Specs
Voltage
120/240 Single-Phase
Frequency
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
206 (BTU: 206,000 BTU/HR) ft3/hr
LP Fuel Consumption @ 50% Load
1.89 (BTU: 171,518 BTU/HR) gallons/hr
Rated Amps
83 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
66 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
200-Amps
Enclosure
Aluminum
Battery
Not Included (525 CCA)
A/C Ton Rating
5-Tons
Mounting Pad
Composite (Included)
Transfer Switch Style
Standard Installation
ATS Load Prioritizing
Not Compatible
ATS Load Shedding
Not Compatible
ATS Poles
2 Poles
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Overview
Made in USA
Yes
Weight
541 Pounds
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
3 Years
Commercial Warranty
3 Years
Model
5813
  1 Question
Q: Who is the manufacturer of the engine?
by Roger Paul from Georgia on May 11, 2012

A: This engine is built by Generac in Wisconsin. It is their OHVI Industrial engine specifically engineered and designed for generator use.
by Mike, Product Expert

Centurion 5813 Reviews & Ratings
Overall Rating
Features
5/5
Quality
5/5
Performance
5/5
Value
5/5
Overall
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
Pros
I'd Buy It Again (1)
Reliable (1)
Fast (1)
Easy To Use (1)
Cons
None to display.
9 Reviews  Sort by 
 
Thomas Keenan
Mansfield, MA
Purchased from Electric Generators Direct
Purchased 6/23/10
REVIEWED
JUL.
15
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Never A Flooded Basement Again!
March of 2010 presented eastern Massachusets with a 200 year rain storm, the largest recorded rain fall ever. We arrived home, after a week's vacation in Ireland, to find that our basement had been flooded. In the next 30 days we were able to install french drains with two heave duty pumps. I discovered that the system could be backed up by battery, but that the pumps would only run for 9 hrs. on their battery back up system which was costly. This storm ran for two days. So I decided that... more
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Dean H.
Purchased from Electric Generators Direct
Purchased 7/25/10
REVIEWED
JUL.
08
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Just Count To 10
Installed it in 2009 and love it! Works everytime without fail. Lights go out and we count to 10.

This unit gives me great piece of mind when i'm working away from my family and know that they are protected and my wife doesn't have to deal with our old portable unit which she does not know how to operate. The longest the unit has continuoulsy run was for 3 days and we were sure glad to have it if not just for being able to run the air conditioner. This unit runs my whole house and we never... more
Pros: Easy To Use, Fast, Reliable, I'd Buy It Again
Dean Recommends This Centurion Product
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00
Ed Bailey
Knoxville, TN
REVIEWED
JAN.
21
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
Ed Bailey
Best investment I have ever made. We live in the country on a dead end road and when our power goes off it is a minimum of 12 hours to two days before it get's restored.

Installation was simple and the unit performs great, now we will have water since we have a well and don't have to worry about our food spoiling in our refrigerators, not to mention TV!

Ordered the generator and it was delivered two days later.
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00
Robert M.
Vernon, VT
Purchased from Electric Generators Direct
Purchased 11/5/10
REVIEWED
JAN.
03
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generator Installation
I am pleased with the generator doing exactly as it is designed to do. I installed the unit myself, and swore that I would never again install another one. The generator itself wasn't the problem. The wire from the utility co. ( meter ) to the service entrance was 2 ga. which is difficult to bend to say the least. The wire to the automatic switch from the generator was 100 amp.wire which bent easier but was still bad enough. After all the connections were made everything worked to perfection... more
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00
Raymond Duhon
Lake Charles, LA
Purchased from Electric Generators Direct
Purchased 8/21/10
REVIEWED
NOV.
17
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Big Sigh Of Relief
I helped my dad install his Generac 13KW generator between Hurricanes Rita and Ike. For Ike, we were without electricity for 4 days, but their generator took care of their essential loads which made their lives easier for a couple their age. They didn't have to look for a hotel room in another state or area of this state. They stayed home.

We shopped around for a good generator for a good price and found the 20KW on this site for cheaper than the 17KW around our area, and the 17KW didn't... more
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00
David
Carnation, WA
Purchased from Electric Generators Direct
Purchased 10/12/10
Total Reviews
2 Reviews
REVIEWED
NOV.
02
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Get Er Done!
Just installed today,the electrician had no problems.Everything but the hotwater heater and range are able to get up and running.

After years of listening to my neighbors generators when power go out, no more sinking feeling of "ok it'll just be for a little while". That little while took 2 weeks a few years.

Nice little product. I am ready!
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00
Vincent Gauthier
Waitsfield, VT
Purchased from Electric Generators Direct
Purchased 10/5/10
REVIEWED
OCT.
31
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Long Vermont Winters
Purchased this unit for complete house power when outage occurs. Unit arrived within 4 days of purchase. everything went smoothly in the complete transaction.

Finished installation this afternoon and everything went flawlessly the first time around. Unit seems to handle the whole house with ease. We are on the end of the power line and are one of the last homes to get power restored an outage.

I'm very happy with the ease of installation and would not hesitate to do another in the... more
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00
Gary Kluck
Raymond, NE
Purchased from Electric Generators Direct
Purchased 8/22/10
REVIEWED
SEP.
12
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Peace Of Mind
I purchased the Guardian 20 KW air cooled unit to take over when the utilities are down. Living outside of the city can be challenging in the winter when the power goes out - now I don't have to worry any more !

This unit powers us back up in less than a minute and will cover all of our needs. I bet the neighbors will be jealous the next time the power goes out !

The install took approx 5 days- I poured a concrete platform for the generator and propane tank. The electrician did his... more
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00
Jim Baugher, Product Expert
Bolingbrook, IL
REVIEWED
MAY.
26
2010
5 out of 55 out of 55 out of 55 out of 55 out of 5
Get 'em Before They're Gone
Some people might mistake the headline above as a cheap marketing tactic.

It's actually the bottom line, honest truth.

Generac Power Systems manufactured this 20kW home standby generator system in early 2010

So, why is it called "Centurion by Generac Power Systems" instead of "Generac Guardian"?

Simple. The Guardian Series is primarily manufactured for dealers like us. The Centurion brand, however, is made for a major retailer. We opted to purchase the... more
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00
 


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Shop for the Generac Centurion™ 5813 - 20kW Standby Generator System (Aluminum Enclosure) at Electric Generators Direct. Research Centurion standby air-cooled generators online. Find Centurion 5813 standby air-cooled generators & Centurion 20KW Aluminum liquid propane and natural gas operated generator system features and specifications.