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Generac Guardian Series Air Cooled Gas Engine Generator - 005873-0

Abt Model: 5873 | UPC Code: 696471058734
 Discontinued Product This item is no longer available from our website.
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Generac - 005873-0 - Generators
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Dual Line, Tri-Lingual LCD Display Nexus Controller/ Simple Field Conversion/ OHVI Engine/ TruePower Technology/ QuietTest Mode/ Added Sound Reduction/ Hour Meter/ Bisque Finish
Discontinued (details)
Estimation zip code - 20149 edit
MethodEstimated DeliveryCost
Scheduled DeliveryTo be determined$418.39
Scheduled Delivery (White Glove)To be determined$518.39

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Product Details

Generac Guardian Series Air Cooled Gas Engine Generator - 5873

Provides essential circuit power protection for your home, ensuring the necessities remain powered during an outage or up to whole house coverage when paired with one of Generac’s load shedding devices. Capable of backing up a five ton air conditioner.

Key Features:

  • Generac's Nexus™ Controller is the most comprehensive available. The dual line, tri-lingual LCD display allows for easy monitoring and management of generator functions.
  • Simple field conversion from natural gas to LP.
  • Generac’s OHVI® engine was designed specifically for generators. It outperforms most competitive generator engines with an engine life that is three to four times longer and has a significantly longer period between scheduled maintenance checkups.
  • TruePower™ Technology provides clean, smooth operation of sensitive electronics and appliances.
  • Choose from premium all-weather aluminum or sturdy galvanneal steel enclosures for superior protection against the elements, modeled to withstand 150 mph winds.
  • QuietTest™ Mode for a weekly self-test that runs quieter than other brands.
  • External "At-a-Glance" indicator lights offer an easy way to tell generator status without opening the generator enclosure.
  • Added Sound Reduction with enclosures that are lined with sound reducing foam panels for further noise reduction.
  • Hour Meter monitors run time, providing information to determine maintenance intervals.
  • Easiest installation on the market and an excellent value when purchased pre-packaged with a pre-wired transfer switch, or customize your system by purchasing the generator and transfer switch separately



  • Generac (OHVI) Design Maximizes engine "breathing" for increased fuel efficiency. Plateau honed cylinder walls and plasma moly rings help engine run cooler, reducing oil consumption. Because heat is the primary cause of engine wear, the OHVI has a significantly longer life than competitive engines.
  • "Spiny-lok" cast iron cylinder walls Rigid construction and added durability provide long engine life.
  • Electronic ignition/spark advance These features combine to assure smooth, quick starting every time.
  • Full pressure lubrication system Superior lubrication to all vital bearings means better performance, less maintenance and significantly longer engine life. Now featuring a 2 year/200 hour oil change interval.
  • Low oil pressure shutdown system Superior shutdown protection prevents catastrophic engine damage due to low oil.
  • High temperature shutdown Prevents damage due to overheating.


  • Revolving field: Allows for smaller, light weight unit that operates 25% more efficiently than a revolving armature generator.
  • Skewed stator: Produces a smooth output waveform for compatibility with electronic equipment.
  • Displaced phase excitation: Maximizes motor starting capability.
  • Automatic voltage regulation: Regulates the output voltage to ±1% prevents damaging voltage spikes.
  • UL 2200 Listed: For your safety


  • •Fully Automatic: Transfers your vital electrical loads to the energized source of power.
  • •Pre-wired, color coded conduits: Ensures the easiest, trouble free installation.
  • •Remote Mounting: Mounts near your existing distribution panel for simple, low cost installation
  • •UL Listed: . For your safety


  • Manual/Auto/Off switch: Selects the operating mode.
  • Utility voltage sensing: Constantly monitors utility voltage, setpoints 65% dropout, 75% pick-up, of standard voltage.
  • Generator voltage sensing: Constantly monitors generator voltage to ensure the cleanest power delivered to the home.
  • Utility interrupt delay: Prevents nuisance start-ups of the engine, setpoint approximately 10 seconds.
  • Engine warm-up: Ensures engine is ready to assume the load, setpoint approximately 10 seconds.
  • Engine cool-down: Allows engine to cool prior to shutdown, setpoint approximately 1 minute.
  • Programmable seven day exerciser: Operates engine to prevent oil seal drying and damage between power outages by running the generator for 12 minutes every week.
  • Smart battery charger: Delivers charge to the battery only when needed at varying rates depending on outdoor air temperature.
  • Main Line Circuit Breaker: Protects generator from overload.
  • Electronic governor: Maintains constant 60 Hz frequency.


  • Weather protective enclosure: Ensures protection against mother nature. Hinged key locking roof panel for security. Lift-out front for easy access to all routine maintenance items. Electrostatically applied textured epoxy paint for added durability.
  • Enclosed critical grade muffler: Quiet, critical grade muffler is mounted inside the unit to prevent injuries.
  • Small, compact, attractive: Makes for an easy, eye appealing installation.


  • Pre-wired External Connection Box
  • 1' Flexible Fuel Line Connector
  • Pre-wired conduits
  • UL Listed wire nuts
    • Easy Installation - Virtually all hardware included, plus step-by-step photographed Installation Guide.

EZ Transfer Switch

  • Electrically operated, mechanically-held contacts for fast, positive connections.
  • Rated for all classes of load, 100% equipment rated, both inductive and resistive.
  • 2 pole, 250 VAC contactors.
  • 160 millisecond transfer time.
  • Dual coil design.
  • Main contacts are silver plated or silver alloy to resist welding and sticking.
  • NEMA 1 (indoor rated) enclosure is standard on the 100 amp switch.
  • Pre-wired 30 foot whip to connect to the pre-wired external connection box.
  • Pre-wired 2 foot whip, color coded to connect into the existing electrical panel.

Package Content:

  • True Power® Electrical Technology
  • Two Line LCD Tri-lingual Digital Nexus Controller
  • 16 Circuit EZ Automatic Transfer Switch with Built-In Priority Load Center
  • Electronic Governor
  • Pre-wired External Connection Box
  • External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators and GFCI Duplex Outlet
  • Flexible Fuel Line Connector
  • Pre-wired conduits
  • Natural Gas or LP Gas Operation
  • UL 2200 Listed



  • Rated Maximum Continuous Power Capacity (LP) 17,000 Watts*
  • Rated Maximum Continuous Power Capacity (NG) 16,000 Watts*
  • Rated Voltage 120/240 120/240
  • Rated Maximum Continuous Load Current – 240 Volts 70.8 LP/66.6 NG
  • Total Harmonic Distortion Less than 5%
  • Main Line Circuit Breaker 65 Amp
  • Phase 1
  • Number of Rotor Poles 2
  • Rated AC Frequency 60Hz
  • Power Factor 1
  • Battery Requirement (not included) Group 26R 12 Volts and 525 Cold-cranking Amperes Minimum
  • 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


  • Type of Engine GENERAC OHVI V-TWIN
  • Number of Cylinders 2
  • Displacement 992cc
  • Cylinder Block Aluminum w/Cast Iron Sleeve
  • Valve Arrangement Overhead Valve
  • Ignition System Solid-state w/Magneto
  • Governor System Electronic
  • Compression Ratio 9.5:1
  • Starter 12 Vdc
  • Oil Capacity Including Filter Approx. 1.9 Qts./1.8L
  • Operating RPM 3,600
  • Fuel Consumption
    • Natural Gas cu.ft./hr.
      • 1/2 Load 183
      • Full Load 261
    • Liquid Propane ft3/hr (gal/hr)
      • 1/2 Load 59 (1.61)
      • Full Load 94 (2.57)
  • Required fuel pressure to generator fuel inlet at all load ranges - 5 to 7 inches of water column for natural gas, 10 to 12 inches of water column for LP gas


  • 2-Line Plain Text LCD Display Simple user interface for ease of operation
  • Mode Switch
    • Auto Automatic Start on Utility failure. 7 day exerciser
    • Off Stops unit. Power is removed. Control and charger still operate.
    • Manual/Test (start) Start with starter control, unit stays on. If utility fails, transfer to load takes place.
  • Programmable start delay between 10-30 seconds Standard
  • Engine Start Sequence Cyclic cranking: 16 sec. on, 7 rest (90 sec. maximum duration)
  • Engine Warm-up 10 seconds
  • Engine Cool-Down 1 minute Starter Lock-out
  • Starter cannot re-engage until 5 sec. after engine has stopped.
  • Smart Battery Charger Standard
  • Automatic Voltage Regulation with Over and Under Voltage Protection Standard
  • Automatic Low Oil Pressure Shutdown Standard
  • Overspeed Shutdown Standard, 72Hz
  • High Temperature Shutdown Standard
  • Overcrank Protection Standard
  • Safety Fuse Standard
  • Failure to Transfer Protection Standard
  • Low Battery Protection Standard
  • 50 Event Run Log Standard
  • Future Set Capable Exerciser Standard
  • Incorrect Wiring Protection Standard
  • Internal Fault Protection Standard
  • Common External Fault Capability Standard


  • No. of Poles 2
  • Current Rating (amps) 100
  • Voltage Rating (VAC) 250
  • Utility Voltage Monitor (fixed)
    • Pick-up 75%
    • Dropout 65%
  • Return to Utility approx. 15 sec.
  • Exerciser weekly for 12 minutes Standard
  • UL Listed Standard
  • Total of Pre-wired Circuits 16
    • No. 15A 120V 5
    • No. 20A 120V 5
    • No. 20A 240V 1
    • No. 40A 240V 1
    • No. 50A 240V 1
  • Circuit Breaker Protected
    • Available RMS Symmetrical Fault Current @ 250 Volts 10,000

Approximate Dimensions:

Main Unit:

  • Length: 48"
  • Width: 25"
  • Height: 29"

EZ Transfer Switch and Load Center:

  • Depth: 7"
  • Width: 12.5"
  • Height:26.5"

Approximate Weight:

  • Unit: 455 lbs
  • Shipping: 485 lbs

Warranty Information:

  • Manufacturers Warranty(authorized online retailer):
    • 2 Years Parts and Labor
    • 3rd Year Parts Only
Downloadable Resources Get Adobe Reader
More reasons to buy the Generac 005873-0 from Abt Electronics
  • is an authorized dealer (Learn More).
  • The Generac 005873-0 is Brand New.
  • The Generac 005873-0 Ships in a Factory Sealed Box.
A/C Rated Output17000 Watts
Starting MethodAuto/Manual
Fuel Tank Capacity (Gal.)None
Height (inches)29"
Width (inches)25"
Depth (inches)48"
Warranty3 Years Parts and Labor


by PowerReviews
Generac Guardian Series Air Cooled Gas Engine Generator

(based on 60 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


  • Refrigerator / freezer (35)
  • Lights (34)
  • Furnace (32)
  • Television / radio (26)
  • Computer (19)


No Cons

Best Uses

No Best Uses

Most Liked Positive Review


Good basic generator for infrequent backup of critical loads

I don't lose power often but do not want to risk a basement flooding or no heat in winter or fridge full of spoiled food, etc, so this was well worth it to...Read complete review

I don't lose power often but do not want to risk a basement flooding or no heat in winter or fridge full of spoiled food, etc, so this was well worth it to me. I am moderately handy and did the installation myself (after getting building permit). One aspect that confused me was the transfer switch manual states that power and control wires to the generator must be in different conduits and the diagrams all indicate this, however the corepower unit is clearly designed to run all in one conduit (the manual pictures show this plus there is only one knockout in the generator electrical interface. In the end I figured the transfer switch manual was written to accomodate larger generators as well and installed the wiring in one conduit (10ga thhn for pwr and 14ga thhn for control). I ran 8ga thhn from the 50A bkr in the utility panel. I left the house (load) grounds and neutrals in the main panel and just ran 12ga thhn from the xfer switch load outputs to a wire nut connection to the hot wire in the main panel (important that the hot wires are just passing through the utility panel, not terminated anywhere in there). A warning sticker came with the transfer switch to put on the utility panel to warn about the presence of feed-through hot wires from the transfer switch. So far i'm happy with the product. I like that the xfer switch that comes with this unit has you use your own wire (no harness) however I they should be more specific in the installation manual in the areas I mentioned. Also note that this engine is more basic than the guardian series (OHV vs OHVI), and therefore may not last as long. Also the corepower has less clean power regulation. If you are expecting to lose power a lot or are powering lots of electronics you should consider the guardian series, otherwise the corepower is a great option.


Most Liked Negative Review


Uneven power to computer is a real concern

My house is small, so I didn't need a large generator. This unit powers most items in the house, but not central a/c or microwave. I have a home-based business so having...Read complete review

My house is small, so I didn't need a large generator. This unit powers most items in the house, but not central a/c or microwave. I have a home-based business so having a generator for back-up power was important. When the generator was tested after installation, it pulsed uneven power to my computer equipment and very much had the potential of doing damage. The electrician had to buy & install a power conditioner so that the system is usable. Same electrician had massive issues with the installation, including 4 failed inspections. Though he had a lot of experience w/Generac system installations in general, this was the first PowerCore he installed, and apparently it posed a lot of problems for him. The generator goes through it's weekly test-run without any issues, but I've not had a real power outage yet to report on a real-life episode.

Reviewed by 60 customers

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Easy to install.


from East Lansing

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

This generator & transfer switch was easy to install. The instructions were easy to follow. I had zero problems with the installation after following the installation instructions. I ran all of the tests and there were no problems the first time I tried out the unit. I ran it a couple of times to make sure.


This product has very nice features for the price


from Rochester

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

This 7kw is enough for what I need for the house. It was pretty easy to install. Very easy to maintain as the sides just lift up and you can access three sides to the unit. it starts up once a week for 10 minutes since it was installed in May 2014. The sound level is less than my lawnmower which was a nice surprise. I purchased and installed the cold weather kit as I live in the North East. I have not had a power outage yet but am confident that it will start up if this happens.


Good product / Good decision


from Undisclosed

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

I live in an area with high water table. I was thinking of getting a portable 6000 watt generator incase of power outage for two sump pit pumps. I have marine battery backup sump pumps but the last outage lasted 5 hours. I decided to have a permanent backup system incase I was gone for a day or more. The professional installer liked the transfer switch and generator unit. The weekly cycle check comes occurs on schedule. The Generator sound is like a lawn mower outside. Electric power has only went out once in my area since the installation and the unit kicked on and the areas of house with dedicated circuits worked. With the smaller unit the only big decision is which house circuits will have the priority.


Good value for the money .


from Wyoming

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

Easy do work on . Side panels are removable for engine servicing . Transfer switch is of top quality. Installation was easy and the machine comes with a good alarm indicator for easy trouble shooting . Adequate power for the home , This machine was bought after a tornado left us without power for 2 days and will serve as insurance for future weather issues such as ice storms . Did not hook up the electric range . It will be rough using the barbeque !


This generator is very good


from port severn

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

Had it installed at my cottage where power often goes out. This unit has never failed to start up and give us hydro for sometimes days rain snow or shine. It runs quiet and is good on fuel. Install was simple and will now be installing on at our house.


Best for my needs


from Plymouth

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

Bought this unit after major snowstorm power outage, best thing I ever did. Comes on in seconds, natural gas power. Would buy it again in a heartbeat, price is GREAT for the product quality and features.


We would recommend this generator for home back-up


from Old Town

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

We have this unit for less than a year but it has responded to every outage we have had


Great product for the price.


from West Bend

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

Economical. Contractor very impressed with the product as he hadn't seen this one before.


love the size & the ease of convience to the inside.


from palm harbor

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

I love the size of this generator and the easy access to the motor area and how the panels pull out to easily get to all parts of inner workings. The generator is also quieter than the one it replaced. I also like the composite panels, this unit should not rust as the previous did.


Very satisfied


from Bridgewater

Comments about Generac Guardian Series Air Cooled Gas Engine Generator:

Reliable product that fulfills all of our back up needs. We are the envy of the neighborhood with our new Generac!

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Generac Guardian Series Air Cooled Gas Engine Generator

Generac Guardian Series Air Cooled Gas Engine Generator


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