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The Generac Guardian™ 20kw aluminum standby generator system (200a service disconnect + ac shedding) is available for purchase today.

Read Generac Guardian 5875 reviews before checking out.


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Generac Guardian™ 20kW Aluminum Standby Generator System (200A Service Disconnect + AC Shedding)

(Based on expert analysis, manufacturer ratings and customer reviews)
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
163 Reviews
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  • Features
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    Q&A 
  • 163
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Grade
Air Cooled Standby Generators
Style
Watts
20 kW
Rated Watts
Voltage
120/240V
Single-Phase
Fuel
Engine
OHVI
Need Help? Ask Our Generator Experts.


Smart Circuit Standby Generator System
Restores power to your entire electrical panel automatically
Digital Load Management (DLM) protects against overload

Nexus Smart Switch™ (RTSD200A3 - Included)
DLM technology allows for the smart control of 2 air conditioners
Service Rated: Mounts between meter and main service panel
200 amp aluminum indoor/outdoor (NEMA 3R) cabinet

Nexus™ Digital Controller
Provides system status to compatible Nexus™ wireless monitors

Aluminum Sound-Attenuated Weather Proof Enclosure
Lightweight material offers superior corrosion resistance
Reduces sound pressure to a low 66 dB(A)
Attractive styling with lockable access doors

Automatic Voltage Regulator
Regulates ouput voltage to ±1% which prevents damaging spikes
Safe for sensitive electronics like computers and televisions

Generac OHVI Air-Cooled Engine
Full pressure lubrication system w/ 2 year oil change interval
1' flexible fuel line and DVD manual included

Listed to UL2200 Engine/Generator Standard for Safety


Model
  Model Number:5875
 UPC:696471058758
 Manufacturer:Generac Guardian
 Made in USA:Yes
Engine
 Brand:Generac OHVI
 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
 Voltage120/240 Single-Phase
 Frequency:60 Hertz
 Cooling SystemAir Cooled
 Fuel TypeLP/Natural Gas
 NG Power Capacity18,000 Watts
 LP Power Capacity20,000 Watts
 NG Consumption (50% Load)206 ft³/hr (BTU: 206,000 BTU/HR)
 LP Consumption (50% Load)1.89 gallons/hr (BTU: 171,518 BTU/HR)
 Rated Amps:83 Amps @ 240 Volts (Single Phase)
 Decibel Rating @ 7m:66 db(A)
 A/C Ton Rating2 x 5-Tons
 EnclosureAluminum
 Mounting PadComposite (Included)
 Transfer Switch:Automatic (Included)
 Transfer Switch Amperage:200-Amps
 Transfer Switch StyleService Disconnect
 ATS Service Disconnect:Yes
 ATS Poles:2 Poles
 ATS Load Shedding:Built-In
 Battery:Not Included (525 CCA)
Overview
 UL ListedYes
 Weight:541 Lbs. (245.40 kilograms)
 Dimensions:48L x 25W x 29H
(121.92 x 63.50 x 73.66 cm)
 Consumer Warranty:3 Years
 Commercial Warranty:3 Years



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  73 Questions
Q: I am interested in the Generac 20KW generator for my house. The problem is that the generator would need to be installed on the oposite side of where my electric service comes in to the house. It is a 200 amp service. The generator would be roughly 60 feet from the main panel. Can this be done?
by Brad Mellon from Illinois on September 09, 2013

A: Thank you for your interest in Electric Generators Direct!

The configuration that you have described is certainly feasible. We would suggest that you confer with a licensed and knowledgeable electrician in order to ensure the proper installation of your Standby system.
by Jim, Product Expert
Q: What is the difference between the Generac model 5875 and their new model 6244 since they are the same size?
by Jim from Illinois on May 02, 2013

A: Generac's model 5875 was the best selling generator on the market and Generac went ahead and improved on the design, warranty and ease of installation after listening to consumer reviews and technicians.

They bumped up the warranty an additional 2 years to give it a solid 5 year overall which is one of the highest rated on the market.

They improved on the generator controller by upgrading to a new technology and moved from their very good Nexus design to the new and improved Evolution controller. This new controller has a back-lit interface with LED's that shows the generator status at a glance.

The new Evolution controller includes maintenance reminders and logs, battery condition (no guessing) and over a half-dozen additional alarms the Nexus controller did not have. This thing rocks!

They upgraded the engine to include a no choke carburetor which helps with all weather starting. They changed the fuel selector for natural gas and LP to an easy knob that is easy to access and change fuel type with ease (No tools required).

For the installers they made several changes to help with installation costs and time, minimize errors and accommodate current and future electric code interpretations by re-engineered some of the wiring connections.

With the changes to the carb and engine they were able to change the low fuel pressure rating for Natural Gas down from 5" of Water Column to 3.5" of Water Column. This will help tremendously with low fuel pressure areas in the country so the meters do not need to be changed as often.

With all of these upgrades they have performed I believe Generac's newest model is one of the best out there and comes highly recommended.

by Jim, Product Expert
Q: Is the transfer swith a Nexus Smart switch unit?
by Jerome Palko from Pennsylvania on April 26, 2013

A: Yes, the switch that comes with generator model 5875 would be model RTSD200A3 and is a Nexus Smart Switch so it matches the Nexus controller inside the generator.

by Jim, Product Expert
Q: What is the oil capacity of the 20kw generac guardians?
by Bryan Sullivan from New Jersey on March 09, 2013

A: Oil Capacity is 1.9 Quarts Including the Oil Filter.

Spec Sheet

by Jim, Product Expert
Q: Does model 5875 come with a pad?
How much are the DLM modules?

by Lee Steiner from Indiana on February 12, 2013

A: All of the Generac home standby generators come with a pre-installed composite pad to protect the bottom of the generator but a sold base needs to be installed such as concrete, crushed stone or pea gravel with a minimum of 3 inches thickness.

Here is the link to the DLM module on the site which shows price and availability....

Generac Model 5937 DLM Module

by Jim, Product Expert
Q: I just brought the 20kW Generac generator with 200 RTS Automatic Transfer Switch. I will be installing to a 200 amp panel. The transfer switch will be about 8' from the generator. What size wire do I need to run from generator and transfer switch? I will be running the same size wire from my meter to the transfer switch and back to my panel that is there now.
by Randy Brown from Tennessee on February 10, 2013

A: You will need to check with the contractor that is handling the installation in order to determine the correct wire gauges. There are a number of variables that will affect this size. In many instances, it is common to see the local building department amend codes that also regulate these specifics. Unfortunately, given my remote location, i am unable to assist in determining this.





by Jim, Product Expert
Q: Can this unit be installed indoors with proper exhaust venting? If not, is there another model more suited to an interior installation?
by Richard Ward from Georgia on February 08, 2013

A: We do not offer any generators for indoor installations, all models much be installed outdoors with proper clearances from buildings to allow for proper ventilation.

There really are no indoor installation generators on the market today due to very strict regulations by OSHA, NFPA and generator manufacturers as it is extremely dangerous due to the carbon monoxide these units produce which is deadly.


by Jim, Product Expert
Q: Could you tell me what size LP tank I would need for a 20kW Generac Home Standby Generator? Could I use two tanks or one big one?

by John Dimsdale from North Carolina on February 06, 2013

A: The minimum LP tank size recommended by Generac would be 200 Gallon depending on the ambient temperature in your area.

It is a good idea to contact your local LP supplier and let them know that you will be installing one of these units that have a BTU rating of 294,000 BTU/HR and they can help you properly size it based on your specific location.

by Jim, Product Expert
Q: I just had my 5875 installed last week. No one can figure out where the 4 screws with the rubber bottom go. Can you help?
by Tony Moscatello from Pennsylvania on January 28, 2013

A: The 4 screws with the rubber bottoms are for the battery compartment and used to help support the battery off of the base of the generator.

by Jim, Product Expert
Q: JIM, WHAT IS THE NOICE OUTPUT DURING THE WEEKLY TESTING MODE? WHERE CAN I FIND THE DOCUMENTATION ON YOUR RESPONSE AS I NEED A VARIANCE AND THE DECIBEL OUTPUT IS REQUIRE DURING THE WEEKLY RUN?
by BOB BACIGALUPI from New Jersey on January 07, 2013

A: This information is found on the Generac spec sheet for this model located under the specs link on the generator page.....

Sound output in dB(A) at 23 ft. with generator operating at normal load - 66

Sound output in dB(A) at 23 ft. with generator in Quiet-Test™ low speed exercise mode - 60

Spec Sheet

by Jim, Product Expert
Q: Where can I download repair and parts manuals for Generac 5875?
Thanks, Warren Stryker

by Warren Stryker from Florida on January 07, 2013

A: With the use of your serial number you can access the manuals via the Generac website under their service section....

Generac Manual Search

by Jim, Product Expert
Q: Is the communication wiring considered class 2 from generator to transfer switch?
by Buck's And Son Electric from New Jersey on October 18, 2012

A: Wire sizing is based on the distance and all wiring must be the correct size and type, and must conform to all local codes, standards and regulations.

You will need to check with the AHJ (Authority Having Jurisdiction) as to what they require for the installation based on local your specific codes.

by Jim, Product Expert
Q: On a propane install what size line is required from the tank to the generator?
by Randy Walters from Kentucky on October 10, 2012

A: The pipe size is based on the distance the generator is from the fuel source.

The 20kW requirements are:

LP -

3/4" - Max 15 Feet
1" Pipe - Max 115 Feet
1-1/4" Pipe - Max 480 Feet

NG -

3/4" - Cannot Use
1" Pipe - Max 20 Feet
1-1/4" Pipe - Max 130 Feet

by Jim, Product Expert
Q: Are mounting bolts for concrete install included in unit packaging?
by Walter from South Carolina on October 06, 2012

A: Generac does not provide the concrete mounting bolts with the generator because it is optional to permanently mount it to concrete.
by Jim, Product Expert
Q: Does the 5870 construction (enclosure make up) meet NFPA 37 condition 2 requirement?
by Bob from New Jersey on October 02, 2012

A: 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.

by Jim, Product Expert
Q: 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.
by Larry from Washington on September 30, 2012

A: 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.

by Jim, Product Expert
Q: Jim, First I want to say that I love your site. Very helpful information in making up my mind on sizing a perfect standby generator. I am looking at the 5875, and am almost sold.

I question I need to determing is the largest wire size that the nexus smart switch that comes in this package, and the breaker in the 5875 can handle. I am in a situation where I need to install the generator on the opposite side of the house as my load center. Initial calculation is that I will need #2 wire to run from the generator to the smart switch. Can the breaker lugs on the generator and the smart switch handle #2 wire? In the manuals posted on line I only see torque specs down to #4 wire. Appreciate your input

by David Bunk from Virginia on September 27, 2012

A: Generator Main line breaker (100A): #4 - 1/0 AWG Cu or #2 - 1/0 AWG Al.

Switch Lug Range (RTSD200A3): 400 MCM - #4

by Jim, Product Expert
Q: I have a Generac 5875 w/smart switch. Do I have to wire my ac to one of the DLM at the generator set? Can I use a separate DLM module if needed instead? Thanks Chris
by Chris Allen from Pennsylvania on September 27, 2012

A: To wire your AC to the generator you can only connect to the AC 1 connection inside the automatic transfer switches load manager via the thermostat wires (24vac).

A DLM module is not needed since your AC unit outside already has a contactor that is activated by your thermostat. The generators load manager will interrupt that signal not allowing the AC to come on if the generator does not have enough power capacity available.

by Jim, Product Expert
Q: I have 150 amp service -- can I use a 200 amp transfer switch?
by Eric from Michigan on September 23, 2012

A: A transfer switch is a simple electrical pass through and can be used in a 150A service but some local codes require a matching amperage switch.

You will need to check with your local certified electrician or electrical inspector to verify your local codes.

If you need a 150A switch you can purchase the generator and switch separately.

Generator Model: 5884

Model 5884

Switch Model: RTSD150A3

Model RTSD150A3

by Jim, Product Expert
Q: Does "low oil alert" mean this engine will shut down if low oil is detected, like most portables?
by Jeff from Virginia on August 31, 2012

A: Yes. The machine will shut down if the oil pressure dips below the safe limit.
by Jim, Product Expert
Q: hello does this unit run on vapor or liquid propane
by Clifford Millaudon from Louisiana on August 31, 2012

A: It runs on low pressure, vapor at 11" WC.
by Jim, Product Expert
Q: can i install this generator myself
by John from Louisiana on August 31, 2012

A: If you have the experience, yes. Many of our customers do, or at least do a good portion of the install and leave the more difficult tasks ( or ones where special tool apply like cutting threads on gas pipe etc) to the pro's.

You can definitely act as the general contractor and do most of the layout work and as much of the connections as you are capable of. Just be sure to follow local codes.
by Jim, Product Expert
Q: Jim, getting ready to order the Generac 5875 20kw generator from you guys for LP. What is recommended LP tank size for this or can you give me some kine of estimate on daily gas consumption?
by Scott Williams from Virginia on August 15, 2012

A: The fuel consumption for this unit per Generac specifications is:

Half Load: 1.89 gallons/hr
Full Load: 2.90 gallons/hr

1.89 x 24 = 45.36 gallons/day

2.90 x 24 = 69.6 gallons/day

by Jim, Product Expert
Q: I'm going to build a house in the spring of 2013 and I want to have a standby generator installed when the house is built.

What would be the best size generator? I plan on having a geothermal heating/ac system and the house will be all electric.

by Dan from Kansas on August 06, 2012

A: Thank you for visiting Electric Generators Direct. In regards to your question, the generator size is determined by the starting amperage load of the equipment you are planning on powering when you lose power.

The starting amperage load will be much larger than the running load and proper calculations need to be done to properly size a unit.

We recommend having a certified electrician do your wattage calculations as every home is different.

The electrician would calculate with the following formula to properly size the generator which should be sized at 80% of its running capacity to allow enough flexibility to handle large intermittent loads and still keep voltage output at proper levels.

(Starting Amps x Volts = Watts)

Note: Geo-Thermal systems can require a tremendous amount of starting current and all calculations should be done onsite professionally.

by Jim, Product Expert
Q: Jim I have my concrete slab ready. I wii be ordering Monday. I am wondering what size bolts it uses when mounting to slab? so I will know what size mounting holes I need to drill for fasteners. Thanks Paul
by Paul from Alabama on July 29, 2012

A: According to Generac you would use 3/8 inch lag bolts.

by Jim, Product Expert
Q: What size copper tubing is required for a 20kW Generator to connect the Propane gas?
by Linda Whitsell from Missouri on July 28, 2012

A: Fuel pipe sizing is base on the distance from the fuel source. The 20kW Generac has the following requirements:

For Propane:

3/4" pipe - max 15 feet
1" pipe - max 115 feet
1-1/4" pipe - max 480 feet

For Natural Gas:

1" pipe - max 20 feet
1-1/4" pipe - max 130 feet
1-1/2" pipe - max 305 feet

by Jim, Product Expert
Q: Hey Jim,
looked everything over pretty close but can not find where the exhaust exits,this is important to me because of location and carbon monoxide poisoning thank you for your time.

by Joe from Virginia on July 19, 2012

A: The exhaust is emitted from the left side of the unit. This is listed in the installation drawings.


by Jim, Product Expert
Q: Does this unit need a winter heater?
by Alan Whitefield from Michigan on July 16, 2012

A: Generac does offer a cold weather kit but its use would be dependent on your local area and what the weather is like.

Generac suggests using the cold weather kit in regions when temperatures drop below 32 degrees F regularly.

Generac Cold Weather Kit for 14 - 20kW Home Standby Generators

by Jim, Product Expert
Q: Jim,

I wanted to know about financing?

by George from Ohio on July 15, 2012

A: George,

The only form of financing we offer would be "Bill Me Later" which offers no payments for 6 months and no interest during the 6 months....click link for details.

Bill Me Later

All other forms of payment are with most major credit cards, check or PayPal.

by Jim, Product Expert
Q: Do I need a separate gas regulator for the 5875 or will the one on the generator be sufficient?
by Tim Hancock from Missouri on July 15, 2012

A: You will definitely need a separate regulator to control the fuel flow to the generator.

Natural Gas: 5-7 Inches of Water Column (0.18-0.25 psi)

Liquid Propane (Vapor): 10-12 Inches of Water Column (0.36-0.43 psi)

by Jim, Product Expert
Q: Where do you connect the 12VDC battery charger?
by Darrell from Texas on July 15, 2012

A: 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.
by Jim, Product Expert
Q: Can I hook up a Generac guardian 5875 to two 200 amp panels? Thanks
by Tamer Bader from Maryland on July 14, 2012

A: Yes, you can connect 2 - 200A switches to the 20kw Generac generator. One switch will be the master and the other will be its slave and do what the master does.

This allows you to utilize both load managers in the switches which gives you more flexibility.

by Jim, Product Expert
Q: With model 5875 what is the model of the transfer switch that comes with the unit?
by Mike Champion from Virginia on July 14, 2012

A: The switch that comes with Model 5875 is the RTSD200A3. Here is the link to the switch page which has the spec sheet and installation manual.

Generac RTSD200A3 Automatic Transfer Switch

by Jim, Product Expert
Q: I have a 20kW Generac with an appropriately sized 200 amp ATS that I purchased two years ago from you guys. I didn't think to ask my electrician at the time about how to connect to both of my 200 amp panels in my house. Instead we moved a few circuits and ties it into one of the panels. I now understand I may be able to connect a second ATS in this configuration to the second 200 amp panel. I'll never use the entire 20 kW load and I want my entire house on back-up generator. Can you prescribe this? If so please specify how it should be configured and which ATS I should buy
by Don Roy from Maryland on July 01, 2012

A: You can connect a second switch to the panel as long as you do not exceed the capacity of the generator.

You will need to consult with your electrician to verify you would not overload the generator.

One of the biggest benefits is that you will be able to connect to both load managers in the switches so you can load shed some large items to prevent the overloading.

The correct switch to purchase and install would be the RTSD200A3 Nexus Smart Switch which is the same switch that you already have with your model 5875.

The switches would work as a master and slave with the original switch telling the second switch to come on when properly connected by your installing electrician.

by Jim, Product Expert
Q: Does the 200A transfer switch come prewired like the 100amp switch?
by Al Privitera from New York on June 19, 2012

A: The 200A transfer switches are not prewired since they are designed for whole house installations. The connection lengths can vary and the switch can be mounted indoor or outdoor which will alter the length of wiring needed.


by Jim, Product Expert
Q: What size concrete pad do I need to build for the model 5875?
by Nick from New York on May 28, 2012

A: The generator dimensions can be found in the installation drawing on the site under the specs link and below (click link).

It is recommended to go a minimum of 6 inches beyond the generator size to allow for a stable base.

Installation Drawing

by Jim, Product Expert
Q: How can you hook up LP & NG at the same time using a cut off value on each gas source?
by John from Virginia on May 16, 2012

A: This is not recommended by Generac, these units are not designed to be connected to two separate fuel types. There are changes that need to be done to the unit when selecting which type of fuel you are using when the unit is being installed.

They come from the manufacturer set-up to operate on natural gas and would be converted in the field to use propane.

by Jim, Product Expert
Q: Jim, what is the phone# where I can order a 20KW Generac propane generator w/transfer switch? Can I pay by check? Somewhere I saw "Save 2% by paying with check". Is this true?
by Fran Downing from Minnesota on May 08, 2012

A: You can either place your order online by adding item# 5875 to the cart and following the checkout procedure or contact customer support at 877-437-7998 and one of the CSR's can assist with placing your order. The following link takes you to the product page:

Model 5875

We do offer pay by check with a 2% savings, you would need to mail a paper check and when the check is received by our accounting department you will be notified via email.

From date of email notification we hold the order for 5 business days and then process and ship the order on the 5th day. See our check policy below:

Pay By Check Policy
by Jim, Product Expert
Q: References are made to "AC units" throughout the Q&A.

Are "AC units" actually heat pumps? Are there any special considerations concerning heat pumps?

by Mike from Pennsylvania on April 16, 2012

A: Heat pump systems typically require a tremendous amount of current at start-up so applications with them require a certified electrician to calculate the starting amperage loads to calculate the actual wattage needed.
by Jim, Product Expert
Q: Where do I get the installation instructions for the Generac Home Standby Generators?
by T Wanamaker from New York on March 12, 2012

A: 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

by Jim, Product Expert
Q: Do I need a battery charger for the 5875 generator?
by Carl Giusto from Texas on March 07, 2012

A: The battery charger is built into the controller inside the generator.

by Jim, Product Expert
Q: In regards to the first question under your Q&A. Are there 2 DLMs included with the ATS on the 5875? I have 2 200amp service and considering an extra ATS/smart switch so are there 2 DLMs that come with the unit and are there 2DLMs that come with the seperate purchase of an additional ATS/smart switch and is it true that each DLM is capable of only 1 high drawing appliance? (model RTSD200A3)
by Paul from Connecticut on February 25, 2012

A: The unit does not come with two actual DLM modules, it is set up to handle 2 AC units without additional DLM modules.

Standard AC units already have a contactor controlled by the thermostat so that control wiring gets routed through the ATS (automatic transfer switch) load manager from t-stat to switch to AC unit.

Actual DLM modules are used for appliances/equipment that does not already have a control system or contactor such as a water heater or electric oven. The DLM acts as a on/off switch controlled by the ATS load manager via the use of low voltage wire.

You can add up to 4 DLM modules per ATS as priorities 1 - 4.

by Jim, Product Expert
Q: Are two DLM included in the Generac Guardian series 5875 with the purchase of the unit?
by Richard Bull from Pennsylvania on February 12, 2012

A: There are 2 AC connections in the Generac Nexus Smart Switch™ which the thermostat wire is run to. So, when the thermostat calls for air/heat and the generator has enough power it will allow the call to go through, thus allowing the AC unit/units to run.

To connect to 2 AC units the DLM modules are not necessary since the AC unit already has a built in contactor/relay controlled by your thermostat.

The DLM modules are for loads (up to 50A) that do not have any control options such as electric ovens or electric water heaters. The DLM acts as a contactor/relay which the transfer switch tell to open or close (on/off) depending on the available wattage from the generator.

by Jim, Product Expert
Q: What is the water column operating pressure of the Generac model 5875?
by Jeff Miedema from Indiana on January 29, 2012

A: You will find the information listed on page 8 of the owner's manual which can be found on the website under the specs link just to the left of the Q&A link.

Natural Gas - 5 - 7 inches WC (0.18 - 0.25 psi)

Liquid Propane Vapor - 10 - 12 inches WC (0.36 - 0.43 psi)

by Jim, Product Expert
Q: Hi Jim,is there any codes to how far from a window the standby generator must be.

Thank You
Frank

by Frank Gelsomino from Connecticut on January 24, 2012

A: 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.

by Jim, Product Expert
Q: What are the BTU's on model 5875?
by Vic from New Jersey on January 20, 2012

A: The BTU for the 20kW Generac 5875 are:

1/2 Load: 206,000 BTU/HR

FULL Load: 294,000 BTU/HR

To calculate:

1 CU-FT = 1000 BTU

(Example: 20kW Generac uses 206 CU-FT/HR x 1000 BTU = 206000 BTU/HR)
by Jim, Product Expert
Q: Hi Jim,

Your top Q&A on this is regarding the use of a second smart-switch to take care of a second 200 amp panel. Can you provide some more details on the wiring of this to the generator and to each other? Does one switch act as master the other as slave? Any wiring diagrams would be appreciated. Do you sell the appropriate switch?

by Jack from New York on January 04, 2012

A: Jack,

Below you will find a link to the one drawing I have that covers a couple ways to do a multi-switch set up. Typically they are done as master and slave.

Dual Service Entrance Switch Connections

by Jim, Product Expert
Q: Hi Jim,
I have two 200 amp breaker panels in my basement that are directly feed by the meter. Should I just buy an extra rtsd200a3 smart transfer switch for the second breaker panel?

by Bob on November 27, 2011

A: Bob,

That is a great way to go while using the additional load shed manager in the second switch so you have a better opportunity to prevent overloading of the generator. Make sure your installing electrician uses these features at a minimum of connecting your AC units. These are the largest starting loads and when using the load manager if the generator does not have the wattage available to start them it will lock them out for a bit.

by Jim, Product Expert
Q: Hi Jim,
I'm thinking of buying the #5875. How do I decide if I need the DLM digital load management module? Also, if I live in NY state (near NY City) do I need the cold weather kit?
Thanks,
Adam

by Adam Abramowitz from New York on October 01, 2011

A: This model will come with digital load modules on it so you can power up to 2 air conditioners without buying an additional digital load module.

If you are interested in powering an additional high surge watt appliance you might consider adding an additional DLM, but most people don't need them.

If the weather ever dips below freezing it is best to consider the cold weather kit. If you ever get below 10 degrees it is a must.
by Jim, Product Expert
Q: what size pipe for 20kw model 5875 connecting to lp or ng
by Mario Deramo from New York on September 27, 2011

A: Mario,

The 20kW unit has a 1/2" pipe connection but, the pipe run diameter is based on the distance from the fuel source.

Minimum pipe size - 1" - with max distance 20 ft
- 1-1/4" with max distance 130 ft
- 1-1/2" with max distance 305 ft

by Jim, Product Expert
Q: Jim,

How much ventilation does a typical genertor require? I just bought the Generac 5875 unit and was hoping to locate it underneath my deck. We have lattice material (with fairly large gaps) covering the underside of the deck. Would it be safe to put it there or does it need to be fully out in the open? I believe there is plenty of air flow beneath the deck.

by Chris G. from Connecticut on August 28, 2011

A: A Generac home standby generator requires 3 feet clearance on the sides, 4 feet clearance from the top, a minimum of 18 inches from the back of the unit (code permitting). A minimum of 5 feet is required from any window, door or ventillation opening due to exhaust.

by Jim, Product Expert
Q: I am looking at a Generac Guardian Series™ 5875 - 20kW Smart Circuit Standby Generator System (Aluminum Enclosure). Would this be enough for a 2 bedroom, 2 bath town home app. 1400 sq ft?
by Charlie Roethlinger from North Carolina on August 27, 2011

A: Yes, this can power a small townhouse with no problem.

In fact, it might even be too large.

For example, the 17kW Essential Circuit Generator can energize 16 circuits in your main electric panel.

If you have 16 or less circuits, you can actually purchase a smaller system.

Here's an article than can help:

How to Pick the Perfect Essential Circuit Standby Generator
by Jim, Product Expert
Q: For a 20 KW nat gas unit which brand to you recommend and why? For use in Dallas. Thanks Jim
by Jim from Texas on August 19, 2011

A: I highly recommend the Generac model 5875 as Generac has the newest technology and the best engine in the industry with their OHVI Industrial engine. This engine is the only one that is specifically designed for generator use and is built in Wisconsin. The most environmentally friendly generator on the market - consumes less fuel and releases fewer emissions. Generac is the number 1 selling generator in the US.

Generac 20kW Model 5875

by Jim, Product Expert
Q: I live in central Indiana and need to know if I would need a cold start kit. I also need the cost as I am trying to consider the total cost of purchasing your 5875-20k. I am on a tight budget and don't want any surprises.
by Frank Edwards from Indiana on July 04, 2011

A: Generac recommends the cold weather kit for climates that drop below 30 Degrees during the cold months. The link below shows the cold weather kit for model 5875:

Cold Weather Kit for 14 - 20kW Generac Standby Generators

by Jim, Product Expert
Q: Hi I want to buy to a country where every thing is European 240v 50 hertz do you have that?
by Seifu Lessanework from Michigan on May 05, 2011

A: Hello,
I'm sorry, but we currently don't offer 50hz generators.

Thanks for inquiring -


by Jim, Product Expert
Q: Is there any issues with a residential NP gas meter being able to supply the 20 kw model at capacity?
by Roddie from Louisiana on May 05, 2011

A: Typically there aren't any issues, however, the Generac 5875 does require 206 ftł/hr @ a 50% load factor. The generator, combined with any other household appliances that also draw fuel will have to be added up to ensure the needed cubic feet is available at a minimum of 7"of water column.

If you get the meter checked by your utility company they can verify all of this for you, or swap meters if required.

Thanks!

by Jim, Product Expert
Q: I need to know how to hook up a generac 5875 generator. I'm the electrican. I can't pull anything up on internet showing this. How to install. It says quick and easy. Can you please help.
by Dale Inman from North Carolina on April 26, 2011

A: You can view the installation guide from the link below by entering the model number exactly as 0058750. This gives you access to all of the manuals, drawings and wiring diagrams. This should help with the installation.

Manual Search

by Jim, Product Expert
Q: What is a composite pad ?
by CHARLES BLYTHE from North Carolina on April 08, 2011

A: 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.
by Jim, Product Expert
Q: for an average home is a nexus smart circuit versus just a standard 16 ats which one is necessary and why i am looking at buying a 17kw-20 kw generac
by Michael Salvato from Florida on March 31, 2011

A: The Nexus Smart Switch is wired directly to the whole panel and certain large circuits, such as AC or pumps, can be wired in the load shedding capabilities so the generator does not overload. With the 16ckt ATS the generator is only wired to the select 16 circuits which have to be sized correctly for the generators capability and only those circuits are powered when power is lost.

It really depends on the equipment in your home as far as which transfer switch system you want to go with.

Proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load. When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps and voltage. When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator). 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.
A certified electrician should be consulted for proper sizing and installation of any generator.

by Jim, Product Expert
Q: Does the Generac 5875 + 12v battery ship with everything needed for a complete installation or will any additional wiring, connectors, etc. be needed. In the event there is damage incurred in shipping that prevents installation or operation what is your policy.


by Cliff Heavrin from Kentucky on March 28, 2011

A: All of the wiring and connectors are to be provided by your installer. This prepackaged unit comes with the generator and transfer switch only. The battery is purchased separately.

The unit must be inspected at time of delivery for any shipping damage. Once you sign the BOL (Bill of Lading) you are saying you received the unit in good condition and we should be contacted immediately if any major shipping damage has occurred. If there are issues with the unit after installation you must contact a local Generac dealer for assistance and warranty work. Our return policy covers shipping damage.

Return Policy

You can find a local dealer from the following link:

Dealer Locator

by Jim, Product Expert
Q: Jim does this unit come with a smart transfer switch?
by Brian Kelly from New Jersey on March 07, 2011

A: Yes, this unit comes with a 200A Nexus Smart Switch model RTSD200A3.
by Jim, Product Expert
Q: How long can the 20kw propane generator run continuously?
by Alan Marcet from California on February 13, 2011

A: These units are designed for emergency back up to lost utility power and if you lose power for an extended amount of time these units can handle running for weeks if necessary. Please note that these units are not designed to run as a primary power source and if installed in this capacity the warranty will be void.

Generac does offer one primary power/off the grid type standby generator which is model 5818 and is specifically designed for extremely long run times.

Model 5818 EcoGen

by Jim, Product Expert
Q: 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.
by David Reece from Texas on February 13, 2011

A: 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

by Jim, Product Expert
Q: How far does a generator has to be from my house?
by Jim from Massachusetts on February 04, 2011

A: 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.

by Jim, Product Expert
Q: What are the BTU requirements for the Generac 20kW Standby Generators?
by Rich from Oregon on January 29, 2011

A: The BTU requirements can be found in the owner's manual which is listed in the specs tab. For the 20kW Generac Standby unit the BTU requirement is 294,000 BTU/HR.

Owners Manual

by Jim, Product Expert
Q: I would like to compare the 20KW 5875 and an equivalent 17KW smart circuit unit. The 17 has adequate capacity for my whole house normal loads. Any reason to oversize?
by Ron Jones from Washington on January 26, 2011

A: To oversize a generator is a great plus as it relieves tremendous starting load from the unit and increases the longevity of the unit due to less stress.

Proper sizing of the generator is crucial to the success of any installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps and voltage.

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator). 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.
by Jim, Product Expert
Q: What size battery do I need?
by James Fritch from Pennsylvania on January 25, 2011

A: 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.

by Jim, Product Expert
Q: 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?
by Ron Hopper from Oklahoma on January 24, 2011

A: 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

by Jim, Product Expert
Q: I originally thought of going with the 17kw and decided (I think) that I'm wanting to go with the 20kw 5875 so that I can mount on the outside of the house and run the 200 amp panel that is on the inside of the house. Am I correct that everything can be outside except main wires going to panel? And it does run the 200 amp service?
Thanks

by Greg French from Washington on January 21, 2011

A: Yes, the included transfer switch with model 5875 is NEMA 3R rated (Indoor/Outdoor) and the only wires entering the home would be the control and power wiring.

This system can connect to a 200A main breaker but depending on the starting amperage loads on the items you intend to power in your home would determine if the 20kW generator is a sufficient size for your needs, as every home installation is different. It is recommended to have a "certified" electrician or Generac installation dealer determine you wattage needs by doing the wattage calculations on the equipment in your home. This is usually the person or company that would also do your generator installation.

The following article can assist you with additional information.

How to Pick the Perfect Home Standby Generator

by Jim, Product Expert
Q: How about the Propane tank size? Do you sell those or do I go to a local dealer to install a good sized tank?
Also, I figure I need only about 12 KW or so with a smart generator set - how quiet can one of those be?

by Tom McDonald from Georgia on January 21, 2011

A: Propane tank size is really determined by your backup needs and how much time you feel would be sufficient for backup. Generac recommends a minimum of 150gal with a 20kW would be a good starting point as the fuel consumption at 1/2 load is 1.89 Gal/Hr. Propane tanks would be purchased or rented from your local Propane dealer.

The generators running decibel rating on model 5875 (20kw) is rated at 63 db(A) at 7m and each of their standby models differ by a couple of db(A)'s.

by Jim, Product Expert
Q: Can this generator be anchored to the slab? If so, can you provide an anchor bolt layout
by Gregg Deemer from Texas on January 21, 2011

A: 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.
by Jim, Product Expert
Q: I noticed that Kohler states you do not need a concrete pad when using their composite shell generator. My question is; does the same go for the Generac model 5875? Can the transfer switch that comes with model 5875 be substituted for a 100A transfer switch?

Thank you,

Kevin

Acres Electric Corp.

by KEVIN BESANCON from Florida on January 21, 2011

A: Generac states that you can use pea gravel as a sufficient base for their standby generators 8kW to 20kW.

To be able to substitute the transfer switch Generac offers the generator alone under model 5887 and a suitable transfer switch can then be purchased separately.

Generac 5887

by Jim, Product Expert
Q: Hi Jim,
I live in Alaska and own a 5875 20KW Home standby Generac. I need to get a cold weather kit. I am looking at the Generac Cold Weather Kit for 14-20kW Home Standby Generators (992/999cc). First, is this the correct product for my generator and second, is it a "plug and play' install?

I understand I will need to change the oil to synthetic 5W30 so my guess is I'll need a maintenance kit as well. The generator has less than 3 hours on it.

Many thanks,

- Bill Thomson

by Bill Thomson from Alaska on January 21, 2011

A: That is the correct cold weather kit for the Generac Guardian 20kW model 5875 (or 5887) and it is a plug and play type unit, however, it is recommended by Generac to have a certified electrician install it due to the high voltage connection.

by Jim, Product Expert
Generac Guardian 5875 Reviews & Ratings
Write Review
Overall Rating
Features
5/5
Quality
5/5
Performance
5/5
Value
5/5
Overall
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
Pros
Fast (1)
Durable (1)
I'd Buy It Again (1)
Easy To Use (1)
Cons
I Have Had Nothing But B... (1)
None (1)
Durability (1)
Unreliable (1)
50% of respondents would recommend this product to a friend
163 Reviews  Sort by 
 
Dan
Bowie, MD
Purchased from Electric Generators Direct
Purchased 8/28/12
Total Reviews
5 Reviews
Total Helpful Votes
12 Helpful Votes
Most Helpful Positive Review
REVIEWED
SEP.
21
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Maryland 20kw Install As General Contractor
I talked to two large, very well known HVAC and Logistics contractors that service my local area (PG county MD). They also specialize in generator installation.

The first - a very large family owned business flat out said $13,000. We provide everything, placed on a gravel and landscape timber pad, permits, everything- done.

The second company, a very large contracting firm for a huge US franchise home improvement store, came up with $12,524. Mounted on a timber and gravel pad, they were... more
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61
Gregg
Great Neck, NY
REVIEWED
AUG.
30
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Unit
Installed 0058750 20kw last Fall. This past weekend (Hurricane Irene) power went out @ 3am Sunday. The generator kicked right on & stayed running, powering everything in my home till power came back on Monday evening.

Added some oil no problem. It's worth every penny to know my family is safe & comfortable. It was actually a great feeling knowing you have power when it's out from the power co, especially at night when your family is enjoying the home & you have a look outside... more
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20
Dustin
Purchased from Electric Generators Direct
Purchased 7/25/12
REVIEWED
SEP.
09
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Product
I installed this 20 KW model with 200 amp ATS just after our last 2-day power outage. We'll be ready the next time the power goes out.

I like the quality of the Generac unit, the ATS installation is pretty straightforward. The one area I feel Generac could re-engineer is where the wiring comes into the rear of the generator. It is almost impossible to wire the unit without first removing the hinges and top lid assembly, and that is definitely a 2 man job. There is very little room to get... more
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10
Dan
Bowie, MD
Purchased from Electric Generators Direct
Purchased 8/28/12
Total Reviews
5 Reviews
Total Helpful Votes
12 Helpful Votes
REVIEWED
SEP.
21
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Right Side Lock/latch Solution
Just wanted to say that on my Generac 5875, the right side latch mechanism was also binding. The problem wasn't the locking mechanism- I didn't need to drill it out. All I needed to do to unlock it is lean on top of the corner of the lid over the lock to take some of the pressure off the lid.

The snug fitting rubber weather seal provides a tight fit against the lid, and the latch and key turn very easily. I can understand that the rubber makes a very tight weather seal. I don't mind pushing... more
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00
Stuart
Mineral, VA
Purchased from Electric Generators Direct
Purchased 8/21/12
Total Reviews
3 Reviews
REVIEWED
SEP.
12
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Model 5875 With 2 Nexus Smart Witches
I replaced a Guardian model 04390-1 that has served me well for the last 9 years. I just wanted to upgrade so I could get my a/c units on the backup system.

My location had 3, 200 amp panels with 2 in the basement and 1 in the garage as a sub panel where the original generator was connected. I had to remove the 200 amp disconnect for garage ( panel "C" ) and use 1 of the new Smart switches to replace it, which I mounted outside by the meter.

The other smart switch I put in the... more
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00
Steve V.
Chesapeake, VA
Total Reviews
2 Reviews
REVIEWED
AUG.
31
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Generator
I ordered the generator and received it 3 days later. I wasn’t home when it was delivered and the delivery guy was able to bring it up my driveway and left it next to the garage.

It was well packed and didn’t have any damage. It was easy to install and started right up. I still haven’t had to use it, but I’m confident it will work when it needs to.
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00
Paul
Purchased from Electric Generators Direct
Purchased 7/29/12
REVIEWED
AUG.
24
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Finally - Power At All Times
I received the generator in perfect condition. It is completely installed except the concrete slab needs to cure longer for drilling and mounting the anchors.

But- no more worries about losing everything in the deep freeze and refrigerator. And, I'm thankful for no more dragging cords to my portable generator, wondering if it had fuel; most of the time in terrible weather.

And, no more sweating to death when the A/C wouldn't run.
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00
Dennis M.
Des Moines, IA
Purchased from Electric Generators Direct
Purchased 7/3/12
Total Reviews
2 Reviews
REVIEWED
AUG.
14
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Peace Of Mind
Although this is still August and the cold weather won't be here for a few months, the Generac Cold Weather Kit is a must if you live in Iowa. It is surprisingly easy to install with the supplied directions.

In fact, the whole generator installation is simple, but I recommend you DIY'ers have a licensed electrician make the final connections, and read the instructions thoroughly.

During the testing, this Generac Guardian performed flawlessly, it ran my Geo-thermal system and... more
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00
John Diorio
Mahaopac, NY
Purchased from Electric Generators Direct
Purchased 11/7/11
REVIEWED
DEC.
19
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
20kw
We have been noticing a change in the weather patterns and decided it was time to put in a genset. I did a lot of research of the different brands and kW’s available. When we decided to go with the Generac 5875, it was time to find a supplier. This is no easy feat in today’s world with the internet and all. You have multiple companies claiming they can do it all and provide it all in less than a week. Of course we mad the decision to buy the generator after a storm and most places were sold out... more
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00
Chris
Fox Island, WA
Purchased from Electric Generators Direct
Purchased 7/30/11
REVIEWED
AUG.
23
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
Whole House Supply
We learned that to buy a smaller generator added the cost of a sub-panel. Since we were already inclined to install sufficient capacity to support all the house loads, we went ahead and got the 20 kW unit.

Installation instructions were clear and complete. The unit was installed and tested over a week's time. It took so long only because I did not have the unit on site at the agreed upon time, but my installers worked with me.

The beast is heavy. We knew that because some websites... more
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00
Tara
Chester, VA
Purchased from Electric Generators Direct
Purchased 10/3/11
REVIEWED
NOV.
16
2011
5 out of 55 out of 55 out of 55 out of 55 out of 5
Just Waiting For An Outage!
Hurricane Irene. Six days without power. Spoiled food, boredom, frayed nerves. Solution = 20Kw whole-house generator. I'm also liking the 50/50 rebate offer that came with it.

The generator was well-packaged for shipping and the box bolted to sturdy pallets. Sufficient guidance was provided for the electrician and the gas plumber. Website specs indicated 541 lbs, bill of lading indicated 481 lbs. Just enough difference to make me wonder if they had shipped a smaller unit but it showed up as... more
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01
Free Freight
  • Ships via Semi-Truck
  • Curb Side Delivery
  • Free to Lower 48 States
  • Standard Rates to Alaska, Hawaii
We currently CANNOT ship this product to Canada or any destination outside of the United States
 


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Shop for the Generac Guardian™ 20kW Aluminum Standby Generator System (200A Service Disconnect + AC Shedding) at Electric Generators Direct. Research Generac Guardian 696471058758 standby air-cooled generators online. Find Generac Guardian 5875 standby air-cooled generators & Guardian 20KW Aluminum liquid propane and natural gas operated generator system features and specifications. Get the best deal; compare Generac Guardian 5875 prices now. Buy the 5875 direct and save.