Generac Guardian™ 10kW Standby Generator System (100A 12-Circuit Switch)

Generac Guardian™ 10kW Standby Generator System (100A 12-Circuit Switch)
Model: 5871
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  • Product Description
  • 35
    Reviews
  • 30
    Product Q&A
  • Recommended Accessories
  • How-To Articles
  • Manuals
Product Description
+
Grade
Style
Run Watts
10,000
Rated Watts
Voltage
120/240 Single-Phase
Fuel
Engine


Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Features
Features
  • Fully Automatic Operation
  • Generac OHVI Air-Cooled Engine
  • Features plateau honed cylinder walls and plasma-moly rings
  • Full pressure lubrication system w/ 2 year oil change interval
  • Aids in cooling the engine for longer life
  • Operates On Clean Burning, Efficient Natural Gas or LP (Vapor)
  • Skewed Rotor Design For Smooth Output Waveform "Clean Power"
  • Automatic voltage regulator equipped for +/- 1% regulation
  • Nexus™ Digital Controller Monitors & Controls All Functions
  • Provides system status - compatible with Nexus™ wireless monitors
  • Sound Attenuated Weather Proof Enclosure
  • Attractive styling with lockable access doors
  • Incorporates electrostatically applied epoxy paint technology
  • Sound dampening enclosure limits sound pressure to a low 63dB(A)
  • Includes 12 Circuit Load Center Style Auto Transfer Switch (100A)
  • 5' Pre-wired External Connection Box From Wall to Generator
  • 30' Pre-Wired Indoor Conduit From Switch To External Box
  • 2' Pre-Wired Indoor Conduit From Transfer Switch To Main Panel
  • 1' flexible fuel line and DVD manual included
  • Listed to UL2200 Engine/Generator Standard for Safety
Specifications
Engine
Engine Brand
Generac OHVI
CC
530 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
10000 Watts
Rated Watts
10000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
9000 Watts
LP Power Capacity
10000 Watts
NG Fuel Consumption @ 50% Load
102 ft³/hr
LP Fuel Consumption @ 50% Load
1.25 gallons/hr
Rated Amps
42 Amps
Decibel Rating @ 7m
63 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
100-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
A/C Ton Rating
2.5-Tons
Mounting Pad
Composite (Included)
Transfer Switch Style
Pre-Wired (12-Circuit)
ATS Load Shedding
Not Compatible
ATS Poles
2 Poles
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
5
20A 120V
3
30A 240V
1
40A 240V
1
Overview
Made in USA
Yes
Weight
387 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
3 Years
Commercial Warranty
3 Years
UPC
696471058710
Grade
Style
Run Watts
10,000
Rated Watts
Voltage
120/240 Single-Phase
Fuel
Engine


Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Features
Features
  • Fully Automatic Operation
  • Generac OHVI Air-Cooled Engine
  • Features plateau honed cylinder walls and plasma-moly rings
  • Full pressure lubrication system w/ 2 year oil change interval
  • Aids in cooling the engine for longer life
  • Operates On Clean Burning, Efficient Natural Gas or LP (Vapor)
  • Skewed Rotor Design For Smooth Output Waveform "Clean Power"
  • Automatic voltage regulator equipped for +/- 1% regulation
  • Nexus™ Digital Controller Monitors & Controls All Functions
  • Provides system status - compatible with Nexus™ wireless monitors
  • Sound Attenuated Weather Proof Enclosure
  • Attractive styling with lockable access doors
  • Incorporates electrostatically applied epoxy paint technology
  • Sound dampening enclosure limits sound pressure to a low 63dB(A)
  • Includes 12 Circuit Load Center Style Auto Transfer Switch (100A)
  • 5' Pre-wired External Connection Box From Wall to Generator
  • 30' Pre-Wired Indoor Conduit From Switch To External Box
  • 2' Pre-Wired Indoor Conduit From Transfer Switch To Main Panel
  • 1' flexible fuel line and DVD manual included
  • Listed to UL2200 Engine/Generator Standard for Safety
Specifications
Engine
Engine Brand
Generac OHVI
CC
530 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
10000 Watts
Rated Watts
10000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
9000 Watts
LP Power Capacity
10000 Watts
NG Fuel Consumption @ 50% Load
102 ft³/hr
LP Fuel Consumption @ 50% Load
1.25 gallons/hr
Rated Amps
42 Amps
Decibel Rating @ 7m
63 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
100-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
A/C Ton Rating
2.5-Tons
Mounting Pad
Composite (Included)
Transfer Switch Style
Pre-Wired (12-Circuit)
ATS Load Shedding
Not Compatible
ATS Poles
2 Poles
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
5
20A 120V
3
30A 240V
1
40A 240V
1
Overview
Made in USA
Yes
Weight
387 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
3 Years
Commercial Warranty
3 Years
UPC
696471058710
Product Specs
+
Specifications
Engine
Engine Brand
Generac OHVI
CC
530 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
10000 Watts
Rated Watts
10000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
9000 Watts
LP Power Capacity
10000 Watts
NG Fuel Consumption @ 50% Load
102 ft³/hr
LP Fuel Consumption @ 50% Load
1.25 gallons/hr
Rated Amps
42 Amps
Decibel Rating @ 7m
63 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
100-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
A/C Ton Rating
2.5-Tons
Mounting Pad
Composite (Included)
Transfer Switch Style
Pre-Wired (12-Circuit)
ATS Load Shedding
Not Compatible
ATS Poles
2 Poles
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
5
20A 120V
3
30A 240V
1
40A 240V
1
Overview
Made in USA
Yes
Weight
387 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
3 Years
Commercial Warranty
3 Years
UPC
696471058710
Reviews
(35)
+
Generac Guardian 5871 Reviews & Ratings
100% of Reviewers Recommend This Product
Product Q&A
(30)
+
How long is the weekly test run?
John 
from New Jersey 
January 26, 2013
Read Response +
Answer
The weekly test run is approximately 12 minutes.
Hide Response -
Hi Jim, do I need the activation code to get generator running or is it simply part of registration process?
Mark 
from New Jersey 
January 07, 2013
Read Response +
Answer
It is basically part of the registration process. When you register the unit either online via the Generac website or by calling the number provided with the generator they will give you the activation code.

Without the activation code the unit will not run in automatic mode.
Hide Response -
If the distance from the transfer switch to the generator far exceeds the 32 ft. prepackaged configuration, would I order a prepackaged unit then eliminate the 32' shielded cable and replace with my own? What is the gauge of the power wires in the 32' cable?
Dan Vecchio 
from New Jersey 
December 22, 2012
Read Response +
Answer
The indoor run from the switch to the wall where you go out to the generator is 30 feet and the run from the switch to your electrical panel is 2 feet. The generator also has an outdoor run of 5 feet connected to the back of the generator along with an outdoor connection box to connect the 30 foot length to where you penetrate the wall.

Per Generac you can add an additional maximum of 15 feet to any of the 3 lengths if needed.

The control wires are 14 gauge, the 2 hots and neutral are #6 and the ground is #8.
Hide Response -
I have a 100 amp breaker panel in my home, wish to purchase the 10K model, but would like the "smart switch" option vs. having to wire to specific circuits. Is that possible?
John Johnson 
from Michigan 
December 21, 2012
Read Response +
Answer
Generac does not offer a prepacked 10kW with the 100A Nexus switch so you would have to purchase each item individually.

Generator model 5883

Switch model RTSD100A3
Hide Response -
I am looking at a 10kw gen I had a few questions: 1. what are the gauges of the cable on the 30' run and how many? 2. does the system include an exterior disconnection box? 3. Is the connection between the disconnection box and the 10KW included?
Juan Salcedo 
from Pennsylvania 
December 11, 2012
Read Response +
Answer
The 30 ft run is indoor only and has 14 gauge control wires, #8 Ground and #6 Neutral and Hot wires.

You can only add an additional 15 ft maximum to the existing run for a max total of 50 feet from switch to generator.

The generator does include a 5 ft whip with an outdoor connection box to connect the 30 ft whip to.
Hide Response -
What is the code for the Generac Guardian 5871-10KW
Troy Hebert 
from Louisiana 
October 12, 2012
Read Response +
Answer
If you are looking for the activation code for the generator you will need to go to the Generac website and register the product for the activation code.

Here is the link....

Product Registration and Activation
Hide Response -
My 500 gal propane tank has a two stage regulator on it . Do I need another regulator at the the generator?
Michael Schwartz  
from New York 
October 07, 2012
Read Response +
Answer
A regulator may be required if the pressure exceeds the generators required 10 to 12 inches of water column (0.36 - 0.43 psi)
Hide Response -
Are mounting bolts for concrete install included in unit packaging?
Walter 
from South Carolina 
October 06, 2012
Read Response +
Answer
Generac does not provide the concrete mounting bolts with the generator because it is optional to permanently mount it to concrete.
Hide Response -
Does the 5870 construction (enclosure make up) meet NFPA 37 condition 2 requirement?
Bob 
from New Jersey 
October 02, 2012
Read Response +
Answer
Subsection 4.1.4 of NFPA 37 reads as follows:

“4.1.4 Engines Located Outdoors. Engines, and their weatherproof housings if provided, that are installed outdoors shall be located at least 1.5 m (5 ft) from openings in walls and at least 1.5 m (5 ft) from structures having combustible walls.
A minimum separation shall not be required where the following conditions exist:

(1) The adjacent wall of the structure has a fire resistance rating of at least 1 hour.
(2)* The weatherproof enclosure is constructed of noncombustible materials and it has been demonstrated that a fire within the enclosure will not ignite combustible materials outside the enclosure.”

A4.1.4 (2) Means of demonstrating compliance are by means of full scale fire test or by calculation procedures.
Because of the limited spaces that are frequently available for installation, it has become apparent that exception (2) would be beneficial for many residential and commercial installations. With that in mind, the manufacturer contracted with an independent testing laboratory to run full scale fire tests to assure that the
enclosure would not ignite combustible materials outside the enclosure.

Per Generac Owner's Manual (All 8, 10, 14, 17 & 20kW Air Cooled Automatic Standby Generator):

The criteria was to determine the worst case fire scenario within the generator and to determine the ignitability of items outside the engine enclosure at various distances. The enclosure is constructed of non-combustible materials and the results and conclusions from the independent testing lab indicated that any fire within the generator enclosure would not pose any ignition risk to nearby
combustibles or structures, with or without fire service personnel response.

Based on this testing and the requirements of NFPA 37, Sec 4.1.4, the guidelines for installation of the generators listed above are changed to 18 inches (457mm) from the back side of the generator to a stationary wall or building. For adequate maintenance and airflow clearance, the area above the generator should be at least 4 feet with a minimum of 3 feet at the front and ends of the enclosure.
This would include trees, shrubs and vegetation that could obstruct airflow. See the diagram on the installation drawing within the owner’s manual on under the specs link for details.

Generator exhaust contains DEADLY carbon monoxide gas. This dangerous gas can cause unconsciousness or death. Do not place the unit near windows, doors, fresh air intakes (furnaces, etc.) or any openings in the building or structure, including windows and doors of an attached garage.
Hide Response -
I have received my 20Kw Generac 5875. Was it shipped with oil or do I need to add oil before i start it up? Or is it just a break in oil (the oil on the dip stickis very light) that needs to be removed and filled with what I will be using in this area? Shipment was timely and arrived n excellent condition.
Larry 
from Washington 
September 30, 2012
Read Response +
Answer
These units have been run and tested at the factory prior to being shipped and do not require any type of break-in.

This unit comes filled with oil from the factory. Check the oil level and add the appropriate amount if necessary.
Hide Response -
Are there 110volt receptacles on this unit?
Troy Hebert 
from Louisiana 
September 17, 2012
Read Response +
Answer
The additional 120V receptacles are only available on the 17kW and 20kW models.
Hide Response -
Where do you connect the 12VDC battery charger?
Darrell 
from Texas 
July 15, 2012
Read Response +
Answer
The Generac Guardian home standby generators have a built in battery charger in the controller inside the generator called the battery sentinel.

This charger will only charge the battery when needed so it will not overload the battery and the controller in the generator monitors the battery and will notify you when there is a battery issue.
Hide Response -
With the recent power outages that occurred in my area it becomes apparent that a standby generator may need to run contiuosly for up to a week. This might happen with ambient temperatures exceeding 100 degrees F. Will the air cooled models such as the GuardianSeries 5871 be able to do this?
Jim Hochgesang 
from West Virginia 
July 12, 2012
Read Response +
Answer
These units have been tested at extreme temperatures and will run to suit your needs. However, when these generators need to run for extended amounts of time you will need to check the oil frequently and fill as necessary. This keeps the unit in good mechanical condition and allows the unit to cool for a time when you are doing the maintenance.
Hide Response -
How do I know how the kw size I need for my 3-bedroom 2-bath with central air double wide, and how much total cost if installed.
David Wambaugh 
from Michigan 
July 06, 2012
Read Response +
Answer
David, the best way to size your generator is to identify which circuits in your main electrical panel that you want powered during an outage.

If you just input your circuits into our calculator, it will instantly recommend a standby generator for your home.

http://www.electricgeneratorsdirect.com/stories/46-How-to-Size-a-Home-Standby-Generator.html
Hide Response -
Do the generators have a built in propane regulator for the Generac 8 and or 10kw models?
Curtis Gibson 
from Virginia 
July 03, 2012
Read Response +
Answer
They do have their own propane regulator but if you are supplying too much service a separate exterior regulator is required. The one in the unit is not adjustable.
Hide Response -
What size breaker do I need for the main panel for a Generac model 5870?
Terry 
from Ohio 
May 31, 2012
Read Response +
Answer
You will need a 40A double pole breaker for the 8kW Essential Circuit model and all other Essential Circuit models (10-17kW) require a 70A double pole breaker.
Hide Response -
Jim: If the steel brackets that hold the # 57811 Generac 10 KW onto the shipping pallet are used to hold the unit down to the concrete pad. How do you use the Black Plugs to fill the holes after installation of these brackets
Jim 
from Florida 
April 18, 2012
Read Response +
Answer
Actually, Generac does not recommend using them anymore. On the installation drawing they show anchor points inside the unit to mount it to a concrete pad....see link for details.....

Installation Drawing

Also, Generac does not offer any plugs for their newer models and the old plugs available are a different shape and will not fit.

Generac recommends going with the fascia kit instead.

Generac Bisque Fascia Kit
Hide Response -
Where do I get the installation instructions for the Generac Home Standby Generators?
T Wanamaker 
from New York 
March 12, 2012
Read Response +
Answer
The unit comes with the installation instructions or you can find them on the Generac website. The instructions you get without the serial number will be basic.

Generac Manual Search
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If I need more wire than the 30 feet supplied, can I splice what ever i need onto it? Also, are the circuit breakers standard ones if i ever need to replace one, or do i have to buy them from Generac?
Stanley Zydel 
from New York 
February 10, 2012
Read Response +
Answer
The maximum length you can add is 15 feet as long as local code permits adding length (some do not). If you need to go beyond this length then the entire run of wiring needs to be changed because of the wire sizes/gauge.

Generac typically uses Siemens breakers in their switches which allows for replacement to be easy.

Please keep in mind that you cannot put larger amperage breakers in to replace smaller amperage breakers.

Please always consult with a certified electrician for proper installation and wiring.
Hide Response -
Hi Jim,is there any codes to how far from a window the standby generator must be. Thank You Frank
Frank Gelsomino 
from Connecticut 
January 24, 2012
Read Response +
Answer
NFPA 37 - 4.1.4 Engines Located Outdoors. Engines, and their weatherproof housings if provided, that are installed outdoors shall be located at least 1.5 m (5 ft) from openings in walls and at least 1.5 m (5 ft) from structures having combustible walls. A minimum separation shall not be required where either of the following conditions exist:

(1) The adjacent wall of the structure has a fire resistance rating of at least 1 hour.
(2)*The weatherproof enclosure is constructed of noncombustible materials and has been demonstrated that a fire within the enclosure will not ignite combustible materials outside the enclosure.

The above code is referenced in NFPA 70 - Article 445 Generator Locations.

You do need to reference with your local inspector what the requirements are for your local city codes along with the requirements in your area for noncombustible materials.

Always consult with a certified electrician on all installation procedures and processes.
Hide Response -
What is the percentage of THD for the 5871 Standby Generator? Is this figure somewhere in the specs pages or owners manual?
Ray Lacourse 
from Massachusetts 
January 04, 2012
Read Response +
Answer
The THD (Total Harmonic Distortion) for the Generac Guardian Series Home Standby Generators is less then 5% which can be found in the Generac spec sheet. The link for the spec sheet is under our specs tab on the product page.

Generac True Power Technology
Hide Response -
Concerning transfer switch circuits. I don't need the 40a 2 pole breaker or the 30 amp 2 pole. But could use 2-20amp 2 pole breakers. Could also use 6-20 amp single pole breakers and 2-15's. Can we make changes to the circuit configurations as long as they don't exceed overall rating? Looking at the Model 5871.
Kent Reeser 
from Illinois 
June 04, 2011
Read Response +
Answer
The pre-wired automatic transfer switches can be modified in the field as long as the internal wiring is changed to the appropriate amperage that gets installed.
Hide Response -
What is a composite pad ?
CHARLES BLYTHE 
from North Carolina 
April 08, 2011
Read Response +
Answer
The composite pad is a strong, lightweight mounting pad provided to simplify the installation. By including the pad with the generator, installation time and cost is reduced since a concrete base is no longer a requirement.
Hide Response -
Hello Jim, do you have, or can you recommend stand-by generator installers for the Houston, Texas area? We are in the N.W. Houston area.
David Reece 
from Texas 
February 13, 2011
Read Response +
Answer
Since we do not get involved in the installation process and since we ship all over the continental US we do not have a list of installers to provide. You can contact a local Generac dealer who may do installations at a reasonable price and will provide you with the best installation knowledge. You do not necessarily have to purchase a Generac generator from them to utilize their installation and they would be your resource for maintenance and warranty repairs.

Service Dealers
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How far does a generator has to be from my house?
Jim 
from Massachusetts 
February 04, 2011
Read Response +
Answer
The manufacturer recommends the back side of the unit to be set no less then 18 inches from any non-combustible surface and the sides of the unit need at least 36 inches for proper intake and exhaust.

Note: It is recommended to check with your city, county and state codes as they may differ from the manufacturers recommendations.
Hide Response -
Is this generator (Model 5884) a good choice for off grid solar system backup. 14kw not essential circuit?
Avery Edwards 
from Colorado 
January 25, 2011
Read Response +
Answer
The Generac 5884 generator is specifically designed for emergency backup only and will not be warranted in an off-the-grid application.

Generac did come out with a new model specifically designed for off-the-grid and solar applications.

Off Grid Generator
Hide Response -
What size battery do I need?
James Fritch 
from Pennsylvania 
January 25, 2011
Read Response +
Answer
The battery is a Group 26R with 525 cold cranking amps - which is often difficult to find locally.

However, don't get too caught up in the specs. We already sized the battery for this model.

Click on the "Add 12V Start Battery" box when ordering.

The current battery price is listed below the generator pricing by the check box.

We don't sell the batteries individually because they are hazardous materials that must ship via freight. If you bought one individually, it would cost more to ship than the battery is worth.

Since this generator is already shipping via semi-truck, we shrink wrap them together, and the battery tags along for the ride.
Hide Response -
What kind of oil comes in the generator, and when it is time to change it? Can I run Mobile 1 Synthetic 5W30 year round in central Oklahoma?
Ron Hopper 
from Oklahoma 
January 24, 2011
Read Response +
Answer
The Generac standby generators are shipped with 5W30 oil in them and Generac does give the option to use 5W30 Synthetic in needed. The owner's manual covers all oil options and temperature ranges. Oil changes are determined by use and maintenance is also covered in the manual.

Owners Manual
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Can this generator be anchored to the slab? If so, can you provide an anchor bolt layout
Gregg Deemer 
from Texas 
January 21, 2011
Read Response +
Answer
Generac's model 5885, as with all of their standby generators, are anchored to the pallet at all 4 corners with special anchors which can be used to anchor the unit directly to your concrete base using concrete bolts.
Hide Response -
Jim, We're interested in this Generac model 5870 and we were wondering under full load what size LP tank capacity should we consider and approximately how much run time could we expect. This will be used in a home application with backup to HVAC needs, a light circuit, sump pump refrigerator /freezer. 3,000 sq ft home. I know that there are many variables and I probably need to get you more information, however, I thought that this would be a good start. Thanks, Mike
Mike Mitrione 
from New Jersey 
January 18, 2011
Read Response +
Answer
Proper sizing of the generator is to size it to 80% of the generators full capacity. 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. So if your need is 8kW then you should look at a 10kW standby generator. Tank size is based on how much run time you want available when you lose power. The fuel usage is listed in the owner's manual which you can find our our website under the specs tab for each model. Normally a 100-Gal. tank or larger is best suited.
Generac 5870
Generac 5871
IMPORTANT!! Please review your wattage needs with a certified electrician to verify you are selecting the right size generator for your needs.
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