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The Generac Guardian Series standby generators are designed to start and operate automatically during a power outage. The 20kW Generac 6244 package is a popular standby generator that uses the integrated Evolution Controller sold by Norwall Power Systems and includes a 20-kilowatt generator packaged with an 200 amp, service-entrance-rated automatic transfer switch.
All Guardian generators operate on either natural gas or on LP gas. Availability and cost are the main factors in choosing between the two fuels, but the fuel choice also affects the power output of the generator. The 6244 can produce a continuous 20 kilowatts of power using LP gas, but that is reduced to 18 kilowatts for natural gas. Fuel consumption at fifty percent load runs about 2.0 gallons per hour for LP gas and 3.9 gallons per hour at full load. Natural gas use is 205 cubic feet per hour at half load, and 308 cubic feet per hour at full load. Required fuel pressure to generator fuel inlet at all load ranges 3.5" - 7" water column for natural gas or 10" - 12" water column for LP gas.
The engine is Generac's own overhead valve industrial engine; the only engine designed specifically for use in a generator. The design of the V-twin, 999 cc engine allows for extended operation with an extended maintenance cycle twice that of most generators. It runs cooler and smoother with less vibration and easily switches from natural gas to LP gas in the field.
The engine senses low oil levels and shuts itself down to prevent damage. Pressurized lubrication helps keep the engine operating smoothly and for extended periods without interruption.
The Generac Automatic Transfer Switch is a UL rated, automated transfer switch that handles the changeover from utility power to the standby generator in the event of a power outage and incorporates load management for high demand appliances. The switch is normally mounted close to the existing service panel for ease of access, installation and convenience.
The Automatic Transfer Switch incorporates load management for high demand appliances through a load-shedding controller and manages one or two air conditioners without additional equipment, and up to four additional high demand appliances with the addition of Power Management Modules(PMM).
The Evolution Controller is an integral component of all Guardian generators and manages generator functions. Once a week it starts the 6244 generator and exercises it for 12 minutes. When the generator is not in use, the controller monitors and charges the battery to ensure it is ready when needed and alerts the owner to replace the battery when it will no longer hold a charge.
When a power outage occurs, the controller senses the outage and waits to ensure it was not a momentary interruption, then starts the generator after 2-1500 seconds (programmable by an authorized Generac dealer, default start is 10 seconds). During operation, it monitors generator voltage continuously and adjusts it for utility quality power, and also controls the frequency to keep it at a steady 60 hertz. When utility power is restored, the controller instructs the transfer switch to change back to utility power, but continues to operate the generator in a cool-down mode for up to one minute before shutting it down.
The Evolution Controller also senses incorrect/improper wiring to alert the user and prevent damage to the system. If the any part of the system shuts down, it can notify the homeowner through a general alarm displayed on the generator control panel. The optional advanced wireless remote controller sounds an audible alarm if a malfunction is detected. The Mobile Link allows remote monitoring of generator status via web, email or texts.
The alternator or generating unit is the heart of the system that produces electricity. It utilizes an efficient revolving magnetic field and a stationary armature with skewed stators that keep the current output smooth, clean, and free of spikes and noise. The unit employs automatic voltage regulation for continuous, unvarying power and also helps to provide for the momentary high inrush currents required by electric motors during startup.
The overall appearance is clean and unobtrusive, with a smooth, protective case. The entire unit stands 29 inches tall, 48 inches wide and 25 inches deep. The aluminum cabinet resists rust and is covered by epoxy paint for a long lasting finish. The engine's muffler is located within the cabinet to guard against burns and injury and keeps the generator's noise level to 66db or lower. The 6244 package includes the fascia and trim kit normally sold as an accessory.
20kw Generac Generator 6244 Includes:
200 Amp Service Rated Automatic Transfer Switch with Digital Power Management technology (DPM) Nema 3R Rated #RTSY200A3, Flexible Fuel Line Connector, Composite Mounting Pad, Base Fascia
|Manufacturer||Generac Power Systems|
|Made In USA||Yes|
|Rated Amps||83.3 LP/75 NG|
|Voltage||120/240V Single Phase|
|A/C Ton Rating||5 Ton|
|Decibel Rating||66 db(A)||Features|
|Low Oil Alert||Yes|
|Battery Requirement||Group 26R, 12V, 525 CCA|
|Mounting Pad||Composite Base Attached|
|Product Weight||451 lbs.|
|Shipping Weight||550 lbs.|
|Dimensions (Inches)||48L x 25W x 29H||Engine|
|Engine Brand||Generac OHVI V-Twin|
|Engine Size||999 cc|
|Cast Iron Sleeve||Yes|
|Cooling System||Air Cooled||Alternator|
|Auto Voltage Regulation||Yes||Fuel|
|NG Power Capacity||18kW|
|LP Power Capacity||20kW|
|NG Consumption @ Full Load||308 cu.ft/hr|
|NG Consumption @ 1/2 Load||205 cu.ft/hr|
|LP Consumption @ Full Load||3.9 gal/hr|
|LP Consumption @ 1/2 Load||2.0 gal/hr||Transfer Switch|
|Transfer Switch Model||RTSY200A3|
|Transfer Switch Amps||200 Amps|
|Transfer Switch Circuits||Service Rated - Whole House|
|ATS Poles||2||Warranty Information|
|Consumer Warranty||5 Year Limited|
Posted by Michael Somers on 3rd Nov 2013
This is the generator to get if you want whole home protection. It is bundled with the proper service rated transfer switch. Fast shipping - ordered on Sunday night and was delivered by Thursday afternoon. UPS Freight delivery was very friendly and called the day before to set up a delivery time window. Delivery driver used pallet jack to put into our garage and waited for us to unpack it to make sure nothing was damaged and everything was there. Moving the generator to it's installation place was not easy. You will need several strong people and/or heavy/special equipment as this weighs over 450 pounds. I would strongly recommend having a qualified and experienced electrician help with the electrical hookup, preferably one who has installed one before. It took 2 people (my self and the electrician) a good 4-5 hours to do all of the electrical hook up. Another major factor to consider is making sure you have the proper amount of gas flow. You will most likely need to upgrade your piping or install a new line to a generator of this size. See the Generac sizing guide for more information. The generator comes factory configured for natural gas. If you are going to convert it to LP, like we did, make sure you are pressing down on the orange knob and turning it in the right direction at the same time. Initially we tried just turning it and it would not budge, after a call to Generac support the conversion was easy after learning that we needed to push down at the same time as turning. Both Generac and Norwall support were very helpful and promptly answered my questions. Came with a free Mobile Link and $100 Home Depot gift card. I would also recommend the cold weather kit (Norwall also sells these) if the generator will be installed in a climate where temps regularly fall below 32F.
Posted by Tadeuz on 2nd Nov 2013
Best ever product!!! Works quietly. Great customer service, which gave great explanations. For sure we are going to recommend to anybody! Thank you Norwall.
Posted by Charlie on 31st Oct 2013
Have installed 3 of these and it's a very good, complete unit. They thought of everything- ASE switch, workable A/C shed, etc .
Posted by Patrick McCarthy on 27th Oct 2013
I have installed many of these generator systems so far and they are really simple hook ups and and they have been running without problems for years.
Posted by Matt P on 10th Oct 2013
I purchased a 20Kw Generac from Norwall about a year ago. First let me tell you about Norwall. Very fast turn around on the order. Once the order was placed I received a call from UPS freight within 2 days to schedule a delivery. The following Monday ( 3 days later ) UPS arrived and delivered an un-injured generator. After gas hook up but prior to house connection we had a 4 day power interruption with over 13 inches of rain. Thanks to the side outlet and some extension cords my sump pump, refrigerator, TV, and some lights plus my neighbors sump pump continued to work. Since then this machine has kept us going through 4 separate outages. Thanks Norwall.
Posted by Russell on 7th Sep 2013
I purchased this unit in 2011 and placed it into service in Feb. of 2012. It has worked well and is not noisy at all in my location. My understanding is that even though it comes with a 200 amp transfer switch the generator is only rated up to 100 amps.
I plan on purchasing another identical unit for another location soon.
Definitely plan to use a Generac install engineer and not just your local electrician for the work. In Texas, I used Rutledge Elec. out of Stephenville.
Posted by Bill on 28th Aug 2013
If you have a basement with a sump pump you really need one of these to allow you to be worry free! Deal with Rebcca at Norwall, she does a great job!
Posted by Arthur O. on 26th Aug 2013
I received my generator on the fifth day of my order. The carrier dropped it right in the driveway as stated. The installation of the unit was much easier than previous smaller units I have installed(one for me and one for my brother).
The 20Kw unit with the whole house automatic transfer switch made for much easier installation. Living here in a small town east of Birmingham, AL you never know when you'll lose power.
Posted by Harry E. Ray, President on 8th Aug 2013
I am President of His Acres Foundation. Our property is located in central VERY RURAL Iowa where it snows a lot and our power was out for 15 days during a blizzard 2 years ago.
Our 20kW Generac performed BEAUTIFULLY the entire time we were snowbound. The purchase of this unit was a safety issue for us. With the 1000 gallon propane tank we have, we have TRUE peace of mind.
Note to John M, Reviewer #5:
We run ALL of our electronic devices using appropriate APC Uninterruptible Power Supplies(UPS's) and don't have those issues.
Posted by Lee on 1st Aug 2013
This is a very nice generator works great!
All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.
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