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The Generac Guardian™ 22kw aluminum standby generator system (200a service disconnect + ac shedding) has been discontinued and is not available for purchase at this time.

 

Generac Guardian™ 22kW 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
142 Reviews
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  • Features
  • Specs
  • 10
    Q&A 
  • 142
    Reviews
  • Articles
  • Accessories
Grade
Airooled Standby Generators
Style
Watts
22 kW
Rated Watts
Voltage
120/240 Single-Phase
Fuel
Engine


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

Generac's New Smart Circuit Standby Generator System
Restores power to your entire electrical panel automatically
Digital Power Management (DPM) protects against overload

Generac Smart Switch™ (RTSW200A3 - Included)
DPM technology allows for the smart control of 4 air conditioners
Service Rated ATS: Mounts between meter and main service panel
200-Amp aluminum indoor/outdoor (NEMA 3R) cabinet

Evolution™ Digital Controller
Provides system status to compatible Generac wireless monitors

Aluminum Sound-Attenuated Weather Proof Enclosure
Reduces sound pressure to a low 58 dB(A) during exercise

Can Be Installed Within 18" Of A Building*
Must be 5 feet from windows & doors, *Check Local Building Codes

Automatic Voltage Regulator
Regulates output 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
12" flexible fuel line and manual included

5-Year Limited Warranty & 24/7/365 Customer Care
Engine
Engine Brand
Generac OHVI
CC
999 CC
Consumer Engine Warranty
5 Years
Commercial Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Yes
Product Specs
Voltage
120/240 Single-Phase
Frequency
60 Hertz
Surge Watts
22000 Watts
Rated Watts
22000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
19500 Watts
LP Power Capacity
22000 Watts
NG Fuel Consumption @ 50% Load
184 (BTU: 184,000 BTU/HR) ft3/hr
NG Fuel Consumption @ 100% Load
281 (BTU: 281,000 BTU/HR) ft3/hr
LP Fuel Consumption @ 50% Load
2.16 (BTU: 196,020 BTU/HR) gallons/hr
LP Fuel Consumption @ 100% Load
3.68 (BTU: 333,960 BTU/HR) gallons/hr
Rated Amps
92 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
67 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
200-Amps
Enclosure
Aluminum
Battery
Not Included (525 CCA)
A/C Ton Rating
2 x 5-Tons
Transfer Switch Style
Service Disconnect
ATS Load Shedding
Built-In
ATS Poles
2 Poles
ATS Service Disconnect
Yes
Cooling System
Air Cooled
UL Listed
Yes
Transfer Switch Circuits
20A 120V
1
Overview
Made in USA
Yes
Assembly Required
Yes
Weight
526 Pounds
Product Length
48 Inches
Product Width
25.3 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
UPC
696471065510
Model
6551
  9 Questions
Q: What size do i need for 1800 so.ft
by Anthony Hawkins from Texas on July 01, 2016

A: Thank you for visiting Electric Generators Direct.

In regards to your question, 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 amperage. The following formula can help determine the starting wattage. (Starting Amps x Volts = Watts) 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.

I have attached an estimated Generator sizing calculator is help you estimate the size to get started.

Generator Sizing Calculator

Please let us know if you have further questions we an assist with.


by Mike, Product Expert

Q: just ought 22k generac it will be 70' from the propane tank what size flex piping should i buy?
by Dennis Kuehl from Wisconsin on June 30, 2016

A: Below is a link to the Install Manual that will cover the pipe sizing using LP. I recommend checking with a plumber or LP company for installation of the gas line.

Install Manual

by Mike, Product Expert

Q: Can the air cooled unit operate in warm weather conditions and not overheat. We just had a 122 degree day and if the electricity had failed, would this generator be able to handle the load in the heat?
by Gene Hunt from California on June 27, 2016

A: Thank you for contacting us.

6551 unit is tested in accordance to UL 2200 standards with an operating temperature of -20 ºF (-29 ºC) to 122 ºF for normal operating range

Please let us know if you have any other questions.
by Mike, Product Expert

Q: Should I pour a concrete base to place this unit on or can you place on a level dirt pad?
by Jim from Iowa on September 03, 2015

A: Thank you for contacting Electric Generators Direct.

I would advise pouring a concrete base. Or I would advise looking into a GenPad.

GenPad

Thank you
by Mike, Product Expert

Q: Hi Jim, I am interested in the 22KW Generac standby generator. How long are the electrical cables that feed the disconnect switch? On television Generac is offering a free wireless monitor, do you also include it? They also include the 5 year warranty?
by Albert Cianfarini from Pennsylvania on July 30, 2014

A: The standby generators that include the whole house style automatic transfer switch does not come with a wiring harness. Due to the multiple application installations the manufacturers will not estimate a wiring length so it is not provided. You will need to have your installing electrician provide the installation wiring. Wire sizing is based on installation distance and local electrical code requirements.

We do not include a wireless monitor with the generators. Occasionally Generac will run a promotion for such items which they sponsor but the order needs to be placed within the specific promotional time frame to qualify.

All of the Generac units have a standard 5 year warranty.

by Mike, Product Expert

Q: On your website, you list the Generac 6551 as having the capability of putting out 92 amps @ 240 volts. Based on that information, I ordered a generator and accessories from you. I will have a natural gas feed and according to Generac, this generator will NOT start my AC unit which requires 82 amps to start up. I am curious to know why your site listed the output as being rated at 92 amps, when in fact it will only put out 81.3 amps for a natural gas feed. I would like to speak to someone as soon as possible about this by phone or response to this email.
by Martin Fitchett from Maryland on July 30, 2014

A: Thank you for your inquiry....

The Generac model 6551 has a rated output capacity of 22,000 Watts when operating on LP and 19,500 Watts when operating on NG which is posted on our site under the specs tab. We also show the maximum rated running amperage for the unit and we have the manufacturers spec sheet, owner's manual, installation guide and switch manual available under the download document section to help with sizing and installation.

All of the home standby generators have a surge output capacity which is well beyond the posted running loads. The surge ratings are not posted within the manufacturer's specification sheet or on our site.

Specification Sheet

The Maximum Surge Capability (LR Amps @ 30% voltage dip) for Generac model 6551 is 209A @ 240V 1P. Which is enough output to handle a standard AC system with an 82A starting requirement. However, if your new unit cannot handle the load when the AC system comes on then there is more load present in the entire system that is causing the generator to shut down.

It is our recommendation that you have either your installer (certified electrician) or a local Generac technician come out to verify all of the loads on the generator at start-up and also to make sure the unit is operating properly and producing the correct output. It is also recommended that the AC system is connected to the generators load shed manager to help alleviate the initial starting when the unit first comes on.

The following link will help you find a local Certified Generac Servicing Dealer....

Generac Dealer Locator

Note: Once a generator is installed all servicing and warranty work is provided at the local level by a Certified Generac Servicing Dealer. Please have unit model and serial number available when contacting them.

by Mike, Product Expert

Q: How big of a generator can I run with a 1 inch black pipe gas line. I would connect within a foot of the house gas regulartor, the generator would sit 10 feet from the regulator and would be an ell and a tee where I would connect.

Please recommend an automatic transfer switch that would work with this generator and I could wire in after the main service power breaker for the house.

Looking for a package recommendation

by Mike Droney from Ohio on July 21, 2014

A: Mike,

Generator sizing is based on the starting loads of the major equipment in the home and the generator fuel pipe needs to be the first item after the gas meter.

For the 22kW model you should review the installation guide below and on page 19 it shows the fuel requirements and the pipe sizing is a couple pages after. The manual covers all models from 8kW to 22kW.

Installation Manual

by Mike, Product Expert

Q: I was trying to guesstimate how large an LP tank I would need to keep it running for 2 days, which unfortunately happens sometimes in the winter in the mountains. Got any help? I realize running at full power vs. scaled down run affects consumption. In the winter, I would need to run electric heat pumps(2), water heater, and refrigerator constantly, but other things, like well water wouldn't be all the time.
by Jerry Boland from West Virginia on July 14, 2014

A: The problem with cold weather and LP tanks is the BTU output drops drastically when the temperature drops.

Here is an example of the BTU output changes based on a typical 500 Gallon LP tank.....

40 degrees F - Output 792,540 BTU/HR

20 degrees F - Output 528,360 BTU/HR

0 degrees F - Output 264,180 BTU/HR

The Generac 22kW model 6551 requires 333,960 BTU/HR at start-up. So, if the temperature drops to 0 degrees F the tank will not have the output capacity to handle the starting requirements of the generator so the generator will not start. Going to a 750, 850 or 1000 gallon tank would be preferred so the unit can handle the starting load.

With that said, these tank sizes can handle several outage days.

Regarding your generator sizing requirements, applications that have heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems.

Due to the tremendous starting load requirements of a heat pump system generator sizing is extremely important because even a 20 or 22kW generator may not have the output capacity to handle these high starting loads.

When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

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 output capacity and will provide a margin of flexibility if the load increases or loads are added in the future.

Another thing you will need to consider since you are in the mountains is generator output degradation due to high elevations. Generators lose 3.5% wattage output for every 1000 feet above sea level so again proper generator sizing is extremely important.
by Mike, Product Expert

Q: What is your opinion of the Generac 20KW with load shed RTS? Reliable?
by Neil from Louisiana on July 01, 2014

A: We have a grading scale on every model along with a Good, Better and Best listing.

The grading scale we offer on the site has our unique algorithm which is the secret sauce that powers our rating system.

It incorporates manufacturer ratings, expert analysis and customer reviews.

Due to the variances in the rating this can alter a products overall grade.

As you see from our recommendations we rate the Generac home standby system as the best on the market today. This is due to their new line of product for 2013 which incorporates over 80 upgrades and the newest technology on the market today.

And now with their new 22kW (only one on the market) air cooled model with engineered advancements and better full consumption rates, Generac really stands above the rest.

by Mike, Product Expert

Generac Guardian 6551 Reviews & Ratings
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
I'd Buy It Again (18)
Price (12)
High Quality (11)
Reliable (10)
Easy To Use (6)
Cons
Bad Instructions (3)
Durability (2)
Heavy (2)
Unreliable (2)
The Start Time Delay Pro... (1)
96% of respondents would recommend this product to a friend
142 Reviews  Sort by 
 
Scott M.
Burr Ridge, IL
Purchased from Power Equipment Direct
Purchased 2/16/15
Total Reviews
3 Reviews
Total Helpful Votes
78 Helpful Votes
Most Helpful Positive Review
REVIEWED
APR.
20
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac Backup Power Service
Installing the 22kW Generac generator is very straight forward except for the battery area is very tight and was not able to use a battery blanket because the compartment for slipping the battery into is so tight.

The unit was easy to install but would like a little more room in the battery compartment to insure no freeze ups during winter months.
View Image
Scott Recommends This Generac Guardian Product
Manufacturer Response
Brand Rep
Scott,
While we are happy to learn of your overall satisfaction with our product, we are sorry to learn that you have experienced issues with applying a cold weather kit in your unit. Please know that we manufacture the accessories featured in these kits for use with our automatic standby generators. Should you require further assistance regarding the installation of a cold weather kit, please do not hesitate to contact us directly at 888-GENERAC (436-3722).
more
Was this review helpful?
6949
Donald N.
Valentine, NE
Purchased from Power Equipment Direct
Purchased 1/13/16
Total Reviews
2 Reviews
Most Helpful Critical Review
REVIEWED
AUG.
11
2016
3 out of 53 out of 53 out of 53 out of 53 out of 5
Checking Generac Guarantee
Purchased 22kw Generac for customer and installed 1-19-2016. Blowing oil all over and out exhaust. Customer says wants new replacement (STRONGLY SAYS). Closest service Tec is 150 miles one way. Generac has been helpful so far and hope their guarantee good. Contacted Generac 7-29-16: Now is 8-11-16 Glad not in Winter with a blizzard.
Pros: Think Jury Still Out
Cons: Like But Time Will Tell
Donald Recommends This Generac Guardian Product
Was this review helpful?
23
Robert Brinson
Hertford, NC
Purchased from Power Equipment Direct
Purchased 8/28/16
REVIEWED
SEP.
20
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Peace Of Mind
I live in rural North Carolina near the Albemarle Sound and the Outer Banks where high winds and flooding are the norm. I'm on fairly high ground but we have to wait for the houses down stream to dry out before our power can be restored. After days without power from Irene in 2011 and tornadoes in 2014 we began to budget for a generator.

Electric generators direct had the best prices and Generac offered a free 10 year warranty so we pulled the trigger. The purchase was easy and EGD is a... more
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Robert Recommends This Generac Guardian Product
Was this review helpful?
00
Marion S.
Hanahan, SC
Purchased from Power Equipment Direct
Purchased 5/11/15
Total Helpful Votes
45 Helpful Votes
REVIEWED
JUL.
09
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac 22kw
After I ordered the generator it arrived within a week and installing was easy with the instructions provided. After installing the start up was easy and the performance was better than expected. I was able to do the installation by myself and would highly recommend this product.
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Marion Recommends This Generac Guardian Product
Was this review helpful?
4538
Ray B.
Glenn Dale, MD
Purchased from Power Equipment Direct
Purchased 7/7/15
REVIEWED
SEP.
08
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Product!
I purchased this generator in Jul 2015 and had it installed the first week in Aug 2015. Since then it has worked flawlessly - We've lost power 4 or 5 times and the generator has run for as short as 10 minutes to as long as 5+ hours fully loaded. No complaints at all. I'm about to do its first yearly schedule maintenance.
Ray Recommends This Generac Guardian Product
Was this review helpful?
22
Richard W.
Ellijay, GA
Purchased from Power Equipment Direct
Purchased 7/29/15
Total Reviews
2 Reviews
REVIEWED
SEP.
19
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generac 22kw Standby
I live in the mountians in remote location. Before I purchased and installed my Generac standby generator I lost power in the middle of the night quite often. Now that I have the generator I have not lost power. I hope it never has to run except the weekly exercise mode. What a great insurance policy.
Richard Recommends This Generac Guardian Product
Was this review helpful?
01
Donald N.
Valentine, NE
Purchased from Power Equipment Direct
Purchased 1/13/16
Total Reviews
2 Reviews
REVIEWED
SEP.
14
2016
2 out of 52 out of 52 out of 52 out of 52 out of 5
Any Warranty On Generac?
Generac Guardian bought for customer from you on 12-29-2015. Activated 1-19-2016.Blowing oil all over out of exhaust on 7-27-2016. Has 10 running hours on. Called Generac -Joshua-Under impression they would replace faulty unit. Received Service Request notification it was RESPONDED(their word for closed). No one from Generac will answer emails. I want a right and wrong in my world and they are WRONG!
Cons: Low Quality, Unreliable, Durability, Warranty Or Not
Donald Does Not Recommend This Product
Mike, the Generator Expert
Product Expert
Donald,
For warranty service, you'll need to work with your local servicing dealer. I would suggest using the Dealer Locator, to find service dealers in your area.
more
Manufacturer Response
Brand Rep
Donald,
Donald,

We're sorry to learn of the unit's issues. Please know that our air-cooled automatic standby generators are backed by a product warranty. An independent authorized service provider in your customer's local area can provide any warranty coverage that applies to your customer's unit. If you or your customer needs help locating an authorized party, please do not hesitate to contact us directly at 888-GENERAC (436-3722); we are available 24/7. Otherwise, authorized servicing options can be located online via the following link: http://www.generac.com/dealer-locator?cid=frm-105-ab
more
Was this review helpful?
01
Timothy C.
Oil City, PA
Purchased from Power Equipment Direct
Purchased 8/3/16
REVIEWED
SEP.
14
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Happy So Far...22kw
Purchased the generator on August 3 to get the 10yr warranty . It was delivered the next week, and driver was very helpful unloading the unit. Had the 22kv gen. Installed behind my garage and connected to a new 330 gal propane tank. Had wiring and plumbing done by a local installer, the unit was easy to setup and it ran today, 9-14-16 for the first time. It fired right up with no troubles. Registered unit online for activation startup code then did online rebate offer 50/50 for friend.

Went... more
Timothy Recommends This Generac Guardian Product
Was this review helpful?
02
Ricky C.
Birmingham, AL
Purchased from Power Equipment Direct
Purchased 11/30/15
Total Reviews
2 Reviews
Total Helpful Votes
14 Helpful Votes
REVIEWED
JAN.
09
2016
5 out of 55 out of 55 out of 55 out of 55 out of 5
Generator
I've installed generators in the past and I have to say this was the smoothest install project to date. I did have a certified gas plumber connect the natural gas but I installed the generator plus electrical connections. The paper work is inside the generator cabinet so I suggest you look online to get the specifics before you order. There are several accessories that can be added so do your research before time to purchase.

My home is 3700 sq. ft. and has 2 full kitchens plus 5 ton AC and... more
Ricky Recommends This Generac Guardian Product
Was this review helpful?
138
Michael F.
Belmont, MI
Purchased from Power Equipment Direct
Purchased 11/11/15
Total Helpful Votes
11 Helpful Votes
REVIEWED
DEC.
28
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Experience And Great Product
I live in Michigan and am away often during the winter months. We had a portable generator which worked well when we were home, but didn't do us much good if we were on the road when the power went out. I researched different generators and where to buy them and kept hearing about Electric Generators Direct. After researching I decided on the Generac Guardian Series generator.

The people at EGD were very helpful in answering my questions and soon I was helping unload my package from the... more
Michael Recommends This Generac Guardian Product
Manufacturer Response
Brand Rep
Michael,
We are thrilled to know that our generator was there for your when you needed it most over the holidays! Thank you for providing us with your candid review. If you haven't done so already, please be sure to register your unit with Generac Nation via the following link: http://www.generac.com/generac-nation-sign-up?cid=frm-105-aa . If you would like to learn more about the registration process, or if you have any additional comments, questions, or concerns, please do not hesitate to contact us directly at 888-GENERAC (436-3722).
more
Was this review helpful?
118
Chris P.
El Sobrante, CA
Purchased from Power Equipment Direct
Purchased 10/5/15
REVIEWED
DEC.
03
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
No More Shortened Vacations
I just installed this unit at my vacation home in the Sierra Nevada. Frequent power outages would leave us with out water and septic pumps along with other electric conveniences that my wife and I prefer. So far it has performed flawlessly and very quiet.

There are a few things Generac could do better. First the specs and tech. support both state the conduit port for the generator is for 3/4" conduit. I didn't believe it as the conductors for 100 amp are large and I was right. It has... more
Chris Recommends This Generac Guardian Product
Was this review helpful?
97
 


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