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The Generac corepower 7kw home standby generator system (50-amp 8-circuit automatic switch) has been discontinued and is not available for purchase at this time.

Generac CorePower 7kW Home Standby Generator System (50-Amp 8-Circuit Automatic Switch)

(Based on expert analysis, manufacturer ratings and customer reviews)
4.2 out of 54.2 out of 54.2 out of 54.2 out of 54.2 out of 5
31 Reviews
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  • Features
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Air Cooled Standby Generators
6 kW
Rated Watts
Need Help? Ask Our Generator Experts.

Fully Automatic Operation - Includes Automatic Transfer Switch
The most affordable standby generator system on the market

Generac OHV Air-Cooled Engine
Cast iron cylinder walls provides durability & long engine life
Full pressure lubrication system w/ spin-on oil filter

Revolving Field Alternator Design
Allows for a smaller, light weight unit
Operates 25% more efficiently than a revolving armature generator

Automatic Voltage Regulation
Prevents damaging voltage spikes

Weather Protective Composite Polymer Enclosure & Mounting Pad
Will not rust & is ideal for harsh and coastal installations

Enclosed Critical Grade Muffler
Provides quiet operation and provides added safety

Includes 8 Circuit Load Center Style Auto Transfer Switch (50A)
Mounts near existing distribution panel for easy installation

Added Features
Manual/Auto/Off Switch & Seven Day Exerciser
Main Line Circuit Breaker & Timed Trickle Battery Charger

Listed to UL2200 Engine/Generator Standard for Safety

  Model Number:5837
 Made in USA:Yes
 HP/CC:432 cc
 Consumer Engine Warranty:Not Available
 Commercial Engine Warranty:Not Available
 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 Capacity6,000 Watts
 LP Power Capacity7,000 Watts
 NG Consumption (50% Load)83 ft³/hr (BTU: 83,000 BTU/HR)
 NG Consumption (100% Load)148 ft³/hr (BTU: 148,000 BTU/HR)
 LP Consumption (50% Load)0.99 gallons/hr (BTU: 89,843 BTU/HR)
 LP Consumption (100% Load)1.26 gallons/hr (BTU: 114,345 BTU/HR)
 Rated Amps:25 Amps @ 240 Volts (Single Phase)
 Decibel Rating @ 7m:67 db(A)
 Mounting PadComposite (Included)
 Transfer Switch:Automatic (Included)
 Transfer Switch Amperage:50-Amps
 ATS Service Disconnect:No
 ATS Poles:2 Poles
 ATS Load Shedding:Not Compatible
 ATS Load Prioritizing:Not Compatible
 Transfer Switch Circuits:5  - 15A/120V
1  - 20A/120V
1  - 30A/240V
 Battery:Not Included (525 CCA)
 UL ListedYes
 Weight:250 Lbs.
(61.98 x 76.71 x 83.82 cm)
 Dimensions:24.4L x 30.2W x 33H
 Consumer Warranty:2 Years
 Commercial Warranty:Not Available

  26 Questions
Q: Regarding the Generac 7kW fueled by Nat Gas . Spec states fuel consumption is 85 ft3/hr for 1/2 load. My question is what is this equivalent to in CCF?

by Ed from Pennsylvania on February 06, 2014

A: Natural Gas is usually measured by volume in the United States and is stated in cubic feet. A cubic foot of gas is the amount of gas needed to fill a volume of one cubic foot under set conditions of pressure and temperature.

To measure larger amounts of natural gas, "CCF" (centum cubic-feet) is used to denote 100 cubic feet, and "MCF" (mil cubic-feet) is used to denote 1,000 cubic feet.

With that said, due to the small amount of consumption you wouldn't convert the current ft3/hr to CCF.

However, if you are trying to calculate the cost in relation to therms listed by your natural gas company the conversion is 1000 ft3/hr equals 10 therms.

by Mike, Product Expert

Q: Can the 5837 generac be operated with a manual double throw transfer switch and started manually? Will the battery charge when the generator is running with it's 30 amp breaker open?
by Steve Harriman from Maine on January 12, 2014

A: All of the home standby systems are automatic operation only. Their internal generator controller must be connected to the appropriate automatic transfer switch otherwise the controller will error and the unit will not run.

We do not offer any manual permanent systems other then a standard portable generator.

Any installation attempt to operate these units manually will void the manufacturers warranty for improper installation.

The internal battery charger operates when properly connected to the automatic transfer switch which supplies the appropriate 120V required for the controller/charger to operate otherwise it will drain the battery.

by Mike, Product Expert

Q: How far does the propane tank have to be from the generator?
by Kevin BURNS from Maine on December 30, 2013

A: This will depend on your local code requirements but typically it is a minimum of 10 feet. Again, local code can either require direct burial or farther distances.

We recommend you check with your local inspector or AHJ (Authority Having Jurisdiction) for local code requirements.

by Mike, Product Expert

Q: What type of oil should I use in my Generac home standby generator?
by Jim from Illinois on November 11, 2013

A: The maintenance section in the Generac's home standby owner's manual lists that the oil type is based on temperature ranges specific in your area.....

SAE-30 above 32º F (0º C)
10W-30 between 40º and -10º F (4º and -23º C)
Synthetic 5W-30 for all temperature ranges

All new models come with SAE-30 oil in them and have been test run at the factory for 25 hours and no break-in is required. The first oil change would be at 2 years or 200 hours, whichever comes first.

by Mike, Product Expert

Q: Why is it there is no engine warranty on Model 5837?
by John DesLauriers from Vermont on October 20, 2013

A: The engine warranty is the same as the overall generator warranty on Generac model 5837. 2 Years....here is the link to review the CorePower warranty.

Generac CorePower Limited Warranty

by Mike, Product Expert

Q: Was wondering what the pressure input on NG needs to be regulated to?
by William from North Carolina on October 14, 2013

A: Thank you for your inquiry....

Required fuel pressure to generator fuel inlet at all load ranges - 5-7" water column (9-13mm mercury) for natural gas.

Note: Gas Pipe sizing is one of the most commonly made mistakes. A properly sized gas pipe is critical to the proper operation of the generator. The generator inlet size has no bearing on the proper gas pipe size.

by Mike, Product Expert

Q: I'm looking at your 7kw Generac and the add says 7kw but the features info show 6kw? The Briggs specs say it can be placed as close as 18 to the house and I read from a customer the composite cover of the Generac has to be 5 feet away? Can you clarify for me?
by Nick Gianacoplos from Connecticut on July 23, 2013

A: The wattage output change is based on the fuel type you would be using. When using Natural Gas all generators have a wattage drop. The Generac CorePower unit outputs 7kW when operating on LP Gas and 6kW when operating on NG.

The Briggs model does offer 18 inches since it has a steel enclosure and the Generac CorePower has a composite enclosure so 5 feet is required as a minimum. We recommend upgrading to the Generac Guardian 8kW which offers the same 18 inches since the enclosure is steel.

Please keep in mind that local code can supersede the distance on any generator so you must check with your local inspector or AHJ (Authority Having Jurisdiction) for your local code requirements.

by Mike, Product Expert

Q: Model 5837 The town would want the manufacturer to say how far from the house. They use the manufactors specs. I bought a Briggs unit 7kw but cant use it because it has to be three feet from the house. Also, is the exhaust and gas imput on the long side of the unit.
by Mike Mazzei from New Jersey on May 18, 2013

A: The Generac CorePower - 60 inches Minimum Distance All Around or 36” inches if the surface has a fire resistant rating of at least one hour per NFPA 37.

You can see the manufacturers recommendations and installation information via the installation drawing on the product page under the specs tab on each models individual information page.

Installation Drawing

by Mike, Product Expert

Q: Can this unit be hooked up to natural gas line for fuel source?
by Simon from New York on May 12, 2013

A: Yes, this unit has dual fuel (NG & LP) capability and comes from the manufacturer already set to operate on Natural Gas.

by Mike, Product Expert

Q: If the standby generator comes with a composite base pad (Generac), do I need to pour a contcrete slab?

Or, can I put the slab on a bed of tampted pea gravle?

by Steve Epstein from New York on January 09, 2013

A: Generac recommends either crushed stone, pea gravel or concrete with a minimum thickness of 3 inches as a suitable base for their generators.

by Mike, Product Expert

Q: How far away can the 5837 model be from the main panel of the house? Is there special control wire that needs to be run to the transfer switch or just line voltage. Could you attach a wiring diagram. Generator will be about 40/50 ft away
by Jim Mayhew from Massachusetts on December 12, 2012

A: You can place the unit no farther then the recommended 100 feet due to voltage drop over distance.

The unit does require control wires to be run along with the line voltage wires and typically per local codes they need to be run in separate conduit.

The installation diagrams are available in the owner's manual....

Owner's Manual

by Mike, Product Expert

Q: Does mod.# 5870 have aux. pull start?
by Tommyboy from New York on December 06, 2012

A: None of the permanent home standby generators offer an auxiliary recoil pull start. These are automated systems that start with a 12VDC battery and start automatically when power goes out and then shuts down when power returns.

by Mike, Product Expert

Q: Jim -- The Generac 5837 looks attractive for our critical home backup needs. We often get short (5-10 minute) power interrupts where we would not want the backup to come on. Can the 5837 be easily manually disabled and only enabled if we have an extended power interruption?
by Mike from California on September 24, 2012

A: It is possible to leave the machine in "off" position, however, the machine would not exercise in this mode. The routine exercise cycle circulates oil in the engine crankcase to give all the internal parts an oil bath and dries out any moisture that can collect over time. You would also not be protected in the event of a longer duration outage if you were not at home during the utility failure.

You can leave the unit in the off mode, but you should consider the possible impact of not having the generator on when you need it versus the nuisance outage run-time events.
by Mike, Product Expert

Q: Can this unit be run from a 30 lb. tank?
by Lenny from Massachusetts on August 15, 2012

A: Unfortunately a 30lb tank will not provide enough backup fuel for this unit and is not recommended.

Generac recommends a minimum 100 gallon tank as the starting point to have a minimum backup capacity.

This unit uses 1.02 gal/hr at half load and in a 24 hour period it would use 24.48 gallons "if" operating at half load for the entire time.

A 30lb tank only holds about 7 gallons of propane.

by Mike, Product Expert

Q: Jim, my wife and I are searching for a standby generator in which we would like to power our house until the power can be restored. What would you recommend?
by Gary Ramsey from West Virginia on July 06, 2012

A: Gary, the Generac Corepower is the smallest home standby generator on the market. It can automatically power 8 circuits, while your sitting on the couch during a blackout.

The best way to size a generator is to determine how many circuits in your main electrical panel that you want to power during a disaster.

Follow our guide and it'll size your generator for you.

by Mike, Product Expert

Q: I am looking at the Generac 5837 to power a small cabin that will be off grid. THe only power besides the generator will be a small solar feeding a battery system and an inverter. I want the generator to start when the inverter signals the battery is low. My concern with all the systems i have found is that the control panel is located inside the generator. Is there a way to relocate the panel to inside the cabin instead of inside the generator?
by Mitchell Cottrell from Missouri on March 30, 2012

A: The Generac 5837 is not designed to work with a solar system and Generac would not warrant the unit if installed in this application.

We do offer one system specifically designed for your application.

The Generac model 5818 EcoGen would do exactly what you need.....click on link below for details.

Generac Core Power Model 5818
by Mike, Product Expert

Q: The specs list no commercial warrenty? So if this is used for backup power for other than residential use the warrenty is not valid? I have a local town that needs a 7-8kw automatic unit for very small loads.
by Chip Diamond from Massachusetts on February 10, 2012

A: That is correct. This generator is not designed for commercial applications. The following Generac 8kW has their OHVI engine and the unit comes with a 3 year commercial warranty. Click link below for details....

Generac Guardian Model 5870

by Mike, Product Expert

Q: I am interested in the Generac 5837, which I see includes 5 x 15A circuits. Can those 15A breakers be changed out to 20A? I rewired my house with all 12ga wire/20A breakers.
by Don from Pennsylvania on September 01, 2011

A: The breakers are designed to prevent the system from overloading.

Bigger breakers can be switched for smaller breakers because the system won't overload.

Unfortunately, we do not recommend switching smaller breakers for larger ones.

Since this is the smallest home standby generator, it wouldn't be a good idea.

You should consider a larger generator with more 20 amp breakers instead.
by Mike, Product Expert

Q: Can the transfer switch be more than 30 feet from the generator? What is the max? Also, what size unit would I need for two refrigerators and some computer equipment (300w)?
by Dave Brodhead from Pennsylvania on September 01, 2011

A: Yes, the transfer switch can be mounted further away.

However, your electrician will need to bring additional wiring when it is installed.

The CorePower will be able to power your refrigerators. Just don't expect it to run a central air conditioner.
by Mike, Product Expert

Q: With LP fuel, roughly how long would a 100-Gallon tank of propane last under average load using a 5837?
by Alan Shupack from New York on August 31, 2011

A: The Generac CorePower 5837 consumes 1.02 gallons/hr at half load.

So, basically, a 100-gallon propane tank would last a little less than 100 hours.

If you run it full load, it would consume more fuel and drain the tank faster.
by Mike, Product Expert

Q: Hi Jim , do i need to have a power disconnect install between the generator going into the house to the tranfers switch? may buy a generac 5837
by Tuan Nguyen from Michigan on June 04, 2011

A: A service disconnect is required when the transfer switch is mounted between the meter and the main breaker in the existing panel. The Generac CorePower (5837) is designed for powering essential circuits only and would be installed after the main panel and wired to specific circuits as to not overload the generators capacity of 7000 watts.

by Mike, 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 Mike, Product Expert

Q: Is this wireless monitor compatible with the Generac CorePower series ?
by Tim from New York on March 01, 2011

A: The Generac Nexus™ Advanced Wireless Monitor is only compatible with the Guardian and EcoGen Series models with the internal Nexus™ Controller and cannot be connected to the CorePower model.
by Mike, Product Expert

Q: Are there any special distances from the house or windows that are required for this unit?
by Brian Warenius from Pennsylvania on January 31, 2011

A: It all depends on what your local building codes are. Contact your city to find out what the local laws are for your area.
by Mike, 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 Mike, Product Expert

Q: While the Generac 5837 comes with a composite base which I assume is simply laid upon the ground, can it be anchored in a more secure manner (poured concrete base with anchor bolts) so as to not be able to be "carted" off?
by Earl D. Johnson from Maryland on January 17, 2011

A: Generac's model 5837, as with all of their standby generators, are anchored to the pallet with special anchors which can be used to anchor the unit directly to your concrete base using concrete bolts.
by Mike, Product Expert

Generac 5837 Reviews & Ratings
Write Review
Overall Rating
4.2 out of 54.2 out of 54.2 out of 54.2 out of 54.2 out of 5
Price (9)
Durable (4)
Features (3)
High Quality (2)
Easy To Use (2)
Bad Instructions (4)
Unreliable (2)
Received With A Damaged ... (1)
Heavy (1)
Very Bad Switch Info For... (1)
54% of respondents would recommend this product to a friend
31 Reviews  Sort by 
Mike S
Marshfield, MA
Purchased from Electric Generators Direct
Purchased 8/27/14
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Generator
Bought this generator for backup power for basic power needs. It was delivered quickly, was simple to install and hook up, and handles my gas heater, refrigerator and lights.
Mike Recommends This Generac Product
Mike's Experience With Electric Generators Direct
Web Site


"Great price, fast shipping , great commuincation with shipping company. Overall purchase was a very positive one and met all my expectations."
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Robert Pilger
Mineville, NY
Purchased from Electric Generators Direct
Purchased 8/27/14
Most Helpful Critical Review
3 out of 53 out of 53 out of 53 out of 53 out of 5
Do Not Purchase This Model!
I was lead to believe that all necessary hardware for insulation was included. The following items needed were NOT included:

5' Pre-wired External Connection Box From Wall to Generator
30' Pre-Wired Indoor Conduit From Switch To External Box
2' Pre-Wired Indoor Conduit From Transfer Switch To Main Panel

I was informed by Electric Generators Direct that they could not supply these items for my installation and that I would have to procure the items on my own. GENERAC informed me that... more
Cons: Does Not Include Needed Wireing Harness
Robert Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
We're sorry for your disappointment, but we do not state that this generator comes with pre-wired conduit. It does come with an automatic transfer switch, but we do not provide the wiring and conduit.

Typically, installers will provide the necessary supplies for installing your generator. This is not your typical do-it-yourself project, so we strongly recommend you hiring a professional.

If you have any questions for us, please give us a call at 1 (800) 800-3317
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Jimmie M.
Ellisville, MO
Purchased from Electric Generators Direct
Purchased 8/21/14
3 out of 53 out of 53 out of 53 out of 53 out of 5
Won't Start
After going through the start/checkout procedure, the unit did start in manual mode after several minutes of cranking. Voltages were good, but it wouldn't start in auto mode - it just timed out on overcrank.

The instructions offer no trouble shooting.

Now I'm waiting for a qualified service man to come out and see what's wrong? Disappointed in the lack of trouble shooting information. Generac could do much better to help the customer.
Cons: Bad Instructions
Jimmie Does Not Recommend This Product
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Linda C.
Sequim, WA
3 out of 53 out of 53 out of 53 out of 53 out of 5
Oil Filters Don't Fit.
Had the unit installed on 4/26/2012 with a (2) two year warranty. The second yearly service was done on 4/15/2014. The oil leaked onto the driveway. The installer had a difficult time finding a filter that worked. Unit sounded like it was running, with difficulty on Sept. 18, 2014 and it was rechecked on Sept. 25, 2014 and it did okay for a while. Yearly service was done on May 11, 2015 and once again the oil is leaking on the driveway.

On May 13, 2015, I was told to use cat litter to soak... more
Linda Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
We advise you to check with Generac regarding the issues you're having. Generac's customer service department can be reached at 1 (888) 436-3722. If you locate and have your generator's serial number handy when you call, they should be able to look up your warranty information to determine what's covered.
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Keith R.
Peck, KS
Purchased from Electric Generators Direct
Purchased 5/13/11
5 out of 55 out of 55 out of 55 out of 55 out of 5
My Little Generator
Installed generator and run it off two grill bottles. Excercises ever Wednesday evening. We have only had to use the unit a few times and once for several hours. Seems to work when it needs to and maintenance for me was and is very easy. I installed it myself, the hardest part was pouring the concrete pad for my heat pump and the generator together. Instructions were easy for me. I have been in the HVACR industry for 40+ years so it was no trouble to install.
Pros: Price, Size
Keith Recommends This Generac Product
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Torrington, CT
Total Helpful Votes
78 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Storm Alfred And Tropical Storm Irene In Ct
I owe Electric Generators Direct and debt of gratitude. Post Irene Sep 2011, I was tired of my Coleman 5K gasoline fired generator which was very hard to pull start and from storing gasoline. At age 50 I told my wife that's it with the old unit and sold it to a friend at work with the transfer switch. I used this web site to do my research and found this web site the best in the USA.

With that being said, I took the information and bought American made Generac and infused my purchase... more
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Hardyston, NJ
Purchased from Electric Generators Direct
Purchased 9/21/11
Total Reviews
2 Reviews
Total Helpful Votes
83 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Unit !
I have had a few times with no power and it is HELL without power ! I live in the country in New Jersey and when you have no power you are on your own. Out here if there is no power you have no water,no toilet and of course just about nothing else! so the last time we lost power I decided it would not happen again. So I did a lot of checking and this little unit could do everything I needed for a great price. So I took the plunge ! I add the battery and lift gate and was still less the... more
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Duncanville, TX
Purchased from Electric Generators Direct
Purchased 3/6/12
Total Helpful Votes
48 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
I Really Like It
I went to the building inspection office and got the needed gas and electrical permits. A few days later I received the generator in perfect condition, and even got help from the truck-driver to move it in place. Installed transfer switch and gas plumbing the next day, and finished the wiring the following day. Building inspector was very pleased with the install and approved installation.

Started up the generator and verified voltage and frequency, and everything was correct. I let the... more
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Mike, the Generator Expert
Product Expert
Maintenance info from owner's manual regarding oil type selection:

All oil should meet minimum American Petroleum Institute (API) Service Class SJ, SL or better. Use no special additives. Select the oil's viscosity grade according to the expected operating temperature.

• SAE 30 Above 32° F
• 10W-30 Between 40° F and -10° F
• Synthetic 5W-30 110° F and below
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Thomas W.
North Fork, CA
Purchased from Electric Generators Direct
Purchased 11/30/10
Total Helpful Votes
13 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
This story is written by the installer, as my client does not have internet or a computer...

She is very happy with both your product and the install that I did. She was somewhat disappointed in the amount of time that it took to receive your product.... then once it made it to us here in North Fork just 3 days ago...

I quickly got the install for her done and now her whole house is on an automated system where she is protected against any power outages that may come.
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Danny C.
Fowlerville, MI
Purchased from Electric Generators Direct
Purchased 12/12/13
Total Helpful Votes
32 Helpful Votes
2 out of 52 out of 52 out of 52 out of 52 out of 5
Poor Product
After installing the generator and following procedure for start up we started the unit, it ran for less than 3 minutes and the motor blew the rod through the side of the block. I called Generac and they referred me to the closest dealership, I talked with the dealer and was told 3 to 4 weeks for repair and I needed to disconnect and bring the unit to him. After delivery of the unit to the dealership for repair and talking with him, he explained to me that this was a very problematic unit and... more
Pros: Price
Cons: Bad Instructions, Low Quality, Unreliable
Danny Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
We're sorry you're having issues with your Generac generator. Generac stands behind their products, if you're have any additional problems, please give us a call.
Was this review helpful?
Lou L.
Hardyston, NJ
Purchased from Electric Generators Direct
Purchased 9/21/11
Total Reviews
2 Reviews
Total Helpful Votes
83 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Life Saver After Hurricane Sandy, New Jersey !!!!!!!
I had purchased this fantastic little POWER HOUSE last year after the first hurricane and snow storm put us out of power for 5 days, and then another 6 days after the next snow storm. I could not put my family through another event like this one ever again, so here is my story.

I had put a review on last year after I put my Generac in service and have watched people put up some not so good reviews, and that scared me. So over the year I have used my Generac a few times for a few hours and... more
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Shop for the Generac CorePower 7kW Home Standby Generator System (50-Amp 8-Circuit Automatic Switch) at Electric Generators Direct. Research Generac 696471058376 standby air-cooled generators online. Find Generac 5837 standby air-cooled generators & 5873 7 kw CorePower Generator features and specifications.