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Generac 5818 EcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator
Model#: GRCN5818

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 60 day money back guarantee
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New or Recon items with possible minor cosmetic damage; CPO 60 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Generac 5818 EcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator

Model#: GRCN5818
Our Price:
Sale Price:
You Save:
$615.99 (14%)
Factory Shipped - Ships in 2-3 business days.
Not guaranteed for 12/24 delivery.
Free Freight Shipping (continental U.S.)

Freight Orders

Freight deliveries require a delivery time be scheduled and someone must be present at the time of delivery to inspect and sign for the merchandise. A representative from the freight carrier will call the phone number entered at checkout to schedule the delivery.

Liftgate Service

For freight deliveries, you have the option of adding a liftgate to your delivery. A liftgate is the device that lowers a product from the truck to ground level.

CPO recommends adding liftgate service for freight deliveries exceeding 100 lbs if you do not have a loading dock or fork lift at the delivery address. Additional charges may apply. The liftgate option will be presented during the checkout process.

Please note that liftgate service only ensures the product is removed from the truck. We recommend you have the additional help of two to four people to move the product to its desired location because drivers are not required to assist.

Requesting liftgate service after ordering may result in additional charges and delays.

  • Free Mobile Link Remote Monitoring System

    Receive a free Generac Mobile Link Remote Monitoring System ($279 value) when you buy a qualifying Generac Generator. The free Mobile link will automatically be added to your order in-cart.
    Offer ends December 21, 2014. While supplies last.


IMPORTANT - This product is Non-CARB Compliant and may not be used in the state of California
Designed specifically to interact with off-grid renewable energy applications, the EcoGen 6 kW is the first generator intended for alternative energy system standby power. It's engineered to easily integrate into an inverter and battery storage system, providing the cleanest running, low emission solution for recharging battery banks.
Stand up to unpredictable weather and unforeseen outages with the most trusted name in residential standby power. If the power ever goes out, your Generac standby generator goes on - automatically - protecting you and your home 24/7.
Never feel powerless with the #1 selling home standby generator. Choose the generator four out of five families have already installed.
  • Extended run capability and long life are gained from Generac's exclusive premium oil recovery and circulation system that virtually halts oil degradation
  • Maintenance intervals are extended by an unprecedented five times the industry standard with 500 hours between oil changes
  • Full pressure lubrication system provides superior lubrication to all vital bearings means better performance, less maintenance and significantly longer engine life
  • Low oil pressure shutdown protection prevents catastrophic engine damage due to low oil
  • High temperature shutdown prevents damage due to overheating
  • Cleaning burning propane fuel increases efficiency contributes to longer engine life and produces significantly less carbon monoxide than gasoline fueled engines
  • Weather protective steel enclosure ensures protection against mother nature with a hinged key locking roof panel for security
  • Lift-out front for easy access to all routine maintenance items
  • UL 2200 listed for your safety
  • Nexus Digital Controller features an LCD display with status indicators, monitors generator performance, and also records any issues for easy troubleshooting
  • Integrated smart charging system only charges the battery when necessary
  • Three position switch allows for automatic, off and manual functions
  • Main line circuit breaker protects generator from overload
  • Factory wired for a full 6 kW at 120VAC with the capability to be reconfigured for a full 6 kW output at 240VAC to accommodate larger 240V inverter systems or two systems paired together
  • Factory equipped with two-wire start to easily connect to the inverter control wires, enables the inverter to automatically start and stop the generator in order to charge the system batteries as necessary
  • Ultra quiet, only 52 dB(A) under normal load
  • Vertically mounted, belt-driven engine drives at a low 2,600 RPMs resulting in a longer life and drastically quieter operation than other systems
  • Composite mounting pad included eliminating the need to pour a concrete base
  • 150 MPH wind resistant design
  • Large reverse-stamped louvers
  • Backed by an unprecedented 3 year/2000 hour limited warranty when used off-grid in an alternative energy system
  • LP Gas Operation Only
  • Electronic Governor
  • External Main Circuit Breaker
  • 1 ft. Flexible Fuel Line Connector
  • Composite Mounting Pad
  • Instruction Sheets


Series: EcoGen Series
Length: 48 in.
Width: 25 in.
Depth: 29 in.
Weight: 387 lbs.
CARB Compliant: No
Enclosure Type: Steel
Engine Displacement: 530cc
Fuel Type: Propane Vapor
Maximum Continuous Load at 120VAC: 50
Noise Level: 52 dB at 23 ft.
Operating RPM: 2,600
Phase: 1
Rated Watts: 6 kW
Starter: 12 Vdc
Type: Residential
Voltage: 120V


Product Reviews


by PowerReviews
GeneracEcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator

(based on 3 reviews)


of respondents would recommend this to a friend.


  • Entire home (3)


    Best Uses

      Reviewed by 3 customers

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      Quite pricy but a great product.

      By Livinthedream

      from Love


      • Entire Home


        Best Uses

          Comments about Generac EcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator:

          I have had my Ecogen for over two years now and approx. 1,000 hrs. on it. Had one issue with the solenoid that controls the choke mechanism. Generac was very supportive and warranty was no issue. A service tech.had to drive up 300 kilometers to install replacement part. Fortunately I am a mechanical kind of guy and was able to tell him what to bring for parts or he would have had to make two trips. I live off grid in the bush of northern Saskatchewan, Canada. My primary power source is Solar. For at least three months of the winter we do not receive enough sunlight to meet our daily needs. Thus the need for a back up generator to charge my battery bank. The past two winters have been very cold and I cannot use any type of electrical devices to assist starting my generator (ie. block heaters, warming devices). I do keep a smart charger on the battery to keep it in top shape and have the Gen. under a lean-to which gives it some protection from the elements. That said the generator starts reliably down to -28 C (18 F). I feel that is quite good for a propane engine. Any colder than that I use a portable Gen. that is kept in a heated shed to charge my battery's. Unfortunately we have had many - 30 - 40C days this winter. This Generator is quite fuel efficient, simple to do maintenance and very quiet. Overall I am very pleased with this product.


          Good, but know what you are getting

          By Lee

          from Chester


          • Entire Home


            Best Uses

              Comments about Generac EcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator:

              I live off the grid in Vermont, and having a propane generator that would auto start was a priority for us. Finding one that was warranted for off-grid use was important; However, a few things surprised me when I got and installed the product. 1. the installation manual is less than clear about how to install and wire this unit. More detail and pictures would be a plus. 2. this unit requires 120v power to keep the on-board battery charged. this seem counterintuitive for a system designed for off-grid use when every electron is precious. the computer that runs the generator uses a lot of power, and will drain the battery in a few days. why not install a more efficient computer so I don't have to waste power in maintaining the battery? 3. if you want 240, you have to order a conversion kit. since I haven't ordered the kit yet, I don't know what it costs, but if it is only a few dollars, why not make it a standard part that is shipped with the unit? it looks to consist of a dual-pole 25-amp breaker, a piece of wire, and instructions. 4. the price i paid was the lowest I found anywhere, but the unit was still almost twice to cost of a unit not warranted for off-grid use. it might have made more sense for me to buy a less-expensive unit without the warranty and be prepared to buy another one later on. hindsight.... It is very quiet, and I have not had any issues with it starting, running or charging my batteries. We will see how the 240V upgrade goes. I recommend this product, but know what you are getting before you buy.


              A true life saver.

              By Mushi

              from Battle Creek


              • Entire Home


                Best Uses

                  Comments about Generac EcoGen Series Air-Cooled 6kW 120V Single Phase LP Engine Residential Generator:

                  We have only had this unit one day, but I can not tell you how much worry has been lifted. My husband has to have breathing treatments every day, some times three times a day, and with the electric going out 2-3 times a year for 4-7 days at a time, we will not have to worry about his treatments. Also, because of his bad lungs we can not longer use our fireplace, this unit will keep our furnace going. Thanks.

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                  Questions & Answers




                  For a period of three years from successful activation of the unit (one (1) year or one thousand hours, whichever occurs first, for units in international markets), Generac Power Systems, Inc. (Generac) warrants that its standby generator will be free from defects in material and workmanship for the items and period set forth below. Generac will, at its option, repair or replace any part(s) which, upon examination, inspection and testing by Generac or an Authorized/Certified Generac Service Dealer, is found to be defective.


                  Any equipment that the purchaser/owner claims to be defective must be examined by the nearest Authorized/Certified Generac Service Dealer. This warranty applies only to Generac emergency automatic standby generators used in "Standby" applications as Generac has defined Standby. Scheduled Maintenance, as outlined by the generator owner’s manual, is highly recommended. This Scheduled Maintenance should be performed by an Authorized/Certified Generac Service Dealer. This will verify service has been performed on the unit throughout the warranty period.

                  WARRANTY SCHEDULE

                  Limited comprehensive coverage on mileage, labor and parts listed.

                  All COMPONENTS YEAR THREE

                  Limited comprehensive coverage on parts listed


                  (or 1000 hours, whichever occurs first) – Limited comprehensive coverage on labor and parts listed.

                  All COMPONENTS

                  Extended Warranties are not available on units sold into International Markets.

                  • 1. Warranty begins upon the successful activation of the unit.
                  • 2. Unit should be Registered and Proof of Purchase and Maintenance must be available.
                  • 3. Warranty is transferable between ownership of original installation site.
                  • 4. Warranty only applies to permanently wired and mounted units.
                  • 5. Any and all warranty repairs and/or concerns, must be performed and/or addressed by an Authorized/Certified Generac Service Dealer, or branch thereof. Repairs or diagnostics performed by individuals other than Authorized/Certified Generac Service Dealers not authorized in writing by Generac will not be covered.
                  • 6. A Generac Transfer Switch is highly recommended to be used in conjunction with the generator set. If a Non-Generac Transfer Switch is substituted for use and directly causes damage to the generator set, no warranty coverage shall apply.
                  • 7. Steel enclosures are warranted against rusting for the first year of ownership only. Damage caused after receipt of generator is the responsibility of the owner and is not covered by this warranty. Nicks, scrapes, dents or scratches to the painted enclosure should be repaired promptly by the owner.
                  • 8. All warranty expense allowances are subject to the conditions defined in Generac's General Service Policy Manual.

                  • 1. Any unit built/manufacturer prior to April 2010.
                  • 2. Generac generators that utilize non-Generac replacement parts.
                  • 3. Costs of normal maintenance (i.e. tune-ups, associated part(s), adjustments, loose/leaking clamps, installation and start-up).
                  • 4. Units sold, rated or used for "Prime Power", "Trailer Mounted" or "Rental Unit" applications as Generac has defined Prime Power, Trailer Mounted or Rental Unit. Contact a Generac Distributor for Prime Power, Trailer Mounted or Rental Unit definition.
                  • 5. Damage to generator system (including transfer switch) caused by improper installation or costs necessary to correct installation.
                  • 6. Units used for Prime Power in place of existing utility power (where utility power is present) or in place of utility power where utility power service does not normally exist.
                  • 7. Fuel connections other than conventional utility company supplied natural gas systems or conventional LP vapor withdrawal systems.
                  • 8. Any failure caused by contaminated fuels, oils, coolants/antifreeze or lack of proper fuels, oils or coolants/antifreeze.
                  • 9. Steel enclosures that are rusting due to the improper installation, location in a harsh or saltwater environment or scratched where integrity of paint applied is compromised.
                  • 10. Failures due, but not limited, to normal wear and tear, accident, misuse, abuse, negligence or improper installation. As with all mechanical devices, the Generac engines need periodic part(s) service and fluid replacement to perform as designed. This warranty will not cover repair when normal use has exhausted the life of a part(s) or engine.
                  • 11. Failures caused by any external cause or act of God, such as collision, theft, vandalism, riot or wars, nuclear holocaust, fire, freezing, lightning, earthquake, windstorm, hail, volcanic eruption, water or flood, tornado or hurricane.
                  • 12. Damage related to rodent and/or insect infestation.
                  • 13. Products that are modified or altered in a manner not authorized by Generac in writing.
                  • 14. Covered warranty labor rates are based on normal working hours. Overtime, holiday, or emergency labor costs for repairs outside of normal business hours will be the responsibility of the customer.
                  • 15. Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or replacement of the defective part(s).
                  • 16. Failure due to misapplication.
                  • 17. Telephone, cellular phone, facsimile, internet access or other communication expenses.
                  • 18. Living or travel expenses of person(s) performing service, except as specifically included within the terms of a specific unit warranty period.
                  • 19. Expenses related to "customer instruction" or troubleshooting where no manufacturing defect is found.
                  • 20. Rental equipment used while warranty repairs are being performed and/or overnight freight costs for replacement part(s).
                  • 21. Costs incurred for equipment used for removal and/or reinstallation of generator, (i.e.: cranes, hoists, lifts, etc.)
                  • 22. Planes, ferries, railroad, buses, helicopters, snowmobiles, snow-cats, off-road vehicles or any other mode of transport deemed abnormal.
                  • 23. Starting batteries, fuses, light bulbs and engine fluids.




                  Any implied warranties which are allowed by law, shall be limited in duration to the terms of the express warranty provided herein. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to purchaser/owner.




                  Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations may not apply to purchaser/owner. Purchaser/owner agrees to make no claims against Generac Power Systems, Inc. based on negligence. This warranty gives purchaser/owner specific legal rights. Purchaser/owner also may have other rights that vary from state to state.

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