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Most Recent Questions
Recent Question:
How does the 22K consume less propane (full load)than the 17K unit? Is this a typo?
Recent Question:
Is the Generac Guardian Series Standby Generator suitable for continuous use as in powering a small restaurant
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my home is ALL electric what size generator should i get
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Will a RTSD200A3 transfer switch work with a new Generac generator?
Recent Question:
What oil comes in the 6551?
Questions with Most Recent Answers
Question:
How does the 22K consume less propane (full load)than the 17K unit? Is this a typo?
Question:
Is the Generac Guardian Series Standby Generator suitable for continuous use as in powering a small restaurant
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my home is ALL electric what size generator should i get
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What should be on the digital screen after activation, "Ready to run and hours of protection"?
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20KW Guardian -- Detect Run and Disable Unnecessary Loads

Customer questions and answers for
Generac Power Systems 20kW-6730

Customer questions and answers:
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Customer questions and answers for Generac Power Systems 20kW-6730

Question

which oil grade is best for my 20kw

I live in Central Texas close to Fort Worth are and our temps range from the low teens to 110, which grade of oil is the best for this temperature range? Or is there a grade of sythetic oil that is best for this region?
State: TX - Texas
asked 1 year, 6 months ago
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J.T.
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answer 1
For our automatic standby generators, if you expect the temperature to drop below freezing, we recommend utilizing a 5W-30 Synthetic oil. Synthetic is a good oil to use if you are looking for a general year-round oil for areas that have significant season changes.
answered 1 year, 6 months ago
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GeneracPowerSystems01
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Question

What can I expect the pressure at the gas valve to drop to when the unit starts?

I have 7" of water column at my generator then when it starts to turn over it drops to 5.5" then when it starts up it dips down to 2.5" for a split second then runs at 6.5". Is this typical or is my gas line undersized?
State: MI - Michigan
Age: 35-44
This product will backup: Entire Home
asked 1 year, 10 months ago
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blackjake
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answer 1
From my gas meter to the generator I am running 1.5" flex pipe. I get a static reading of 6.5 inches of water with the generator off, and it drops to 6.2 with the generator running in test mode.

I have yet to test it under full load conditions.
State: PA - Pennsylvania
Age: 55-64
This product will backup: Entire Home
answered 1 year, 6 months ago
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Pinky
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answer 2
For a 20kW automatic standby generator on natural gas it will require 5-7” water column, and when utilizing propane it will require 10-12” water column. The pressure should never drop below 5” water column for natural gas, or 10” water column for propane. There should be no more than a 1” change in water column from the generator being static, to cranking, and to running. Any change larger than 1” water column will indicate an improper fuel supply to the unit.
answered 1 year, 10 months ago
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GeneracPowerSystems01
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Question

Oil change on new 20KW unit?

I will get a brand new 20KW the next days. I live in CT and it winter time is approaching, expecting temperatures below 32 degrees for an extended period of time. The unit comes from the factory shipped with the standard oil that does not seem to work well in the winter. However I read that it is recommended to keep the oil for 8 hours to break the engine in. Should I manually run the unit for 8 hours and then change to synthetic 5W-30 for the winter? Or can I change to synthetic 5W30 right away?
State: CT - Connecticut
asked 1 year, 9 months ago
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awolf
Stamford
on 20kW-6730
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answer 1
Wolf

Baby it's cold outside and you like others want the best for the investment.. let it run on the oil it came shipped with for 10 hrs...engine run time that is... then do a swap with the oil filter and synthetic oil..you can't go wrong..everyone is talking about the same issue that we both have...I know it's alot $ we have invested..Synthetic is the way to go..relax palomine just do it..I'm on the same coast as you.. Baby it's cold outside...
State: NJ - New Jersey
Age: 45-54
This product will backup: Entire Home
answered 1 year, 8 months ago
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stevek
Galloway
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answer 2
The appropriate intervals for oil changes and other maintenance items will be located in the owner’s manual in the Maintenance Schedule. Current production models do not require the 8 hour break in, so if the manual indicates you do not need the 8 hour break in you could change the oil and filter and switch to synthetic 5W-30 right away. If your manual recommends the 8 hours run time prior to the first oil change, we would advise against switching to synthetic until that time is up. The generator can either be allowed to run its exercises to meet the necessary hours, or you can manually run the unit more often than the pre-set 12 minute weekly tests to meet the 8 hour requirement.
answered 1 year, 9 months ago
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GeneracPowerSystems01
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Question

What is the min distance from the 20KW unit and the RTS switch when mounted outdoors

I am mounting the switch next to the meter on the back of the house - how close can I mount the generator to this RTS switch - can it be right next to it to one side (assuming the generator is proper distance from the structure and the switch is mounted on the structure)
 
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asked 1 year, 9 months ago
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Greg in MD
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answer 1
The minimum distance the automatic standby generator can be placed from a structure or the transfer switch is 18” from the back side where fuel and wiring connections are made. Please see the attached placement guide for assistance. We recommend speaking to your inspector to verify installation distances, as local and state codes vary.
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answered 1 year, 8 months ago
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GeneracPowerSystems01
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answer 2
Greg;

I assume you mean the ATS...the closer the better to your meter and if you can mount the ATS as close to your 200 amp circuit breaker panel the better..Generator should be on your slab or within 10 ft for conveinece if you can do it .. I have pics if you would like to see how i have mine set up.. this works and let Generac know you can contact me..
State: NJ - New Jersey
Age: 45-54
This product will backup: Entire Home
answered 1 year, 9 months ago
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stevek
Galloway
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Question

what size natural gas line is reccomended for the 20 kw?

State: OH - Ohio
Age: 55-64
This product will backup: Entire Home
asked 1 year, 7 months ago
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Bob
on 20kW-6730
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answer 1
Bob;

Most gas lines going into your home is 3/4 inch. I had to get a bigger gas meter to accomodate the 5 to 7 inch water column pressure requirements for the 20k. The gas company came out and changed out the old for new at no charge. With the bigger gas meter the 5 to 7 inches of water column (pressure requirements) were met. I then went with ( stil tapping off the 3/4 inch feed from the meter) to 1 1/4 inch riser all the way to the gen and then reduced back to 3/4 to hook up to the gen. me and my neighbor both did it this way and it worked fine, you should have no problem
State: NJ - New Jersey
Age: 45-54
This product will backup: Entire Home
answered 1 year, 7 months ago
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stevek
Galloway
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answer 2
The gas line should be sized by a Generac dealer or a certified plumber, based on the volume and pressure required. The volume and pressure required for the 20kW unit utilizing natural gas is 294,000 BTU/hr with 5-7” of water column, and if utilizing propane is 267,120 BTU/hr with 10-12” of water column.
answered 1 year, 7 months ago
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GeneracPowerSystems01
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Question

Which oil should I use for year-round service in Chicago?

I have a Guardian Series 20 kW. I am coming up on 8 hours total run time so I am getting ready to change the oil for the first time. I am a little confused by the Owners Manual that states I should use 10W-30 for operation between -10°F and +40°F, and SAE-30 for operation above 40°F. I live in the Chicago area, so it rarely, if ever, goes below -10°F, so 5W-30 does not seem to be the best choice. I am hoping i don't have to change the oil twice per year even if the generator has only been exercised. Which oil should I use for year-round operation in Chicago?
State: IL - Illinois
Age: 55-64
This product will backup: Entire Home
 
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asked 1 year, 5 months ago
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Gary
Chicago
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answer 1
The chart that is shown below should provide guidelines for recommended oil. Please select the oil based on the coldest temperature that will be experienced throughout the year. The oil utilized for a cold temperature will be acceptable for use at warmer temperatures, but oil designated for warmer temperatures are not acceptable for use in colder temperatures. This is why a synthetic 5W-30 is the recommended oil for places with significant temperature changes, as it covers all temperature ranges.
For our automatic standby generators, if you expect the temperature to drop below freezing, we recommend utilizing a 5W-30 Synthetic oil, which can be used year round. We also recommend using a cold weather kit, which includes a battery warmer and a crankcase heater. Using the correct oil and cold weather kit will allow the generator to start and run in below freezing temperatures. There are no other heaters or accessories that would be required for cold weather starting, provided the cold weather kit is properly installed.
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answered 1 year, 5 months ago
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answer 2
Gary,

This question will get you a wide range of different answers.

I have researched this question myself some time, and I have concluded that the best solution for me is to use the synthetic oil maintenance kit offered by Generac ( http://shop.generac.com/p/synthetic-kit-for-20kw-generac-generator ).

This comes with 2 quartz of fully synthetic 5w-30 oil. I figure that if Generac recommends this for wide temperatures fluctuations ( that on the low end go below freezing), then it is good enough for me. You may want to look into the heater kit if you routinely approach temps significantly below freezing.

Good luck,

David
State: PA - Pennsylvania
Age: 55-64
This product will backup: Entire Home
answered 1 year, 5 months ago
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Pinky
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Question

what is the ammount of fuel used per hr? propane fuel

State: TN - Tennessee
Age: 55-64
asked 2 months, 1 week ago
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chuck
thorn hill
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answer 1
The 20kw Generator specification's state that @ half load generator will use an average of 1.64 gallons per hour. Generator being used at @ 100 percent load will use an average 2.95 gallons per hour. Keep in mind that many factors can cause these numbers to vary due to different loads. One Example : If a house is poorly insulated generator even though it may not be used at full load may affect the fuel consumption due to A/C inrush current duty cycles are higher than a house that is well insulated . I hope this gives you an idea of what to expect from a 20 kw generator.
State: TX - Texas
Age: 35-44
answered 2 months, 1 week ago
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Ferezco
Poteet
+1point
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answer 2
When operating at full load on a liquid propane vapor fuel source, Generac’s 20kw Guardian Series automatic standby generator, model number 6244, will require 350,000 btu/hr, and 10-12” of water column. If you are interested in obtaining further specifications regarding this unit, they can be obtained by either contacting us directly at 888-GENERAC (436-3722), or using the model or serial number of the product in question via the following link: http://www.generac.com/service-supp....
answered 2 months, 1 week ago
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GeneracPowerSystems02
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Question

On a 20KW automatic whole house generator, the 14-2 wire used as control and sensing can this wire be solid or strand or it doesn't matter.

State: MD - Maryland
Age: 55-64
asked 1 month ago
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DA
Annapolis
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answer 1
Depending on code. Stranded wire typically has a higher ampacity than solid. However, on the sensing circuit, this shouldn't matter that much unless the distance is extreme.
Kirk
State: CO - Colorado
Age: 45-54
answered 1 month ago
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kirk
Durango
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answer 2
While stranded wire should be utilized, we would recommend checking with your local inspector, to ensure that this requirement is acceptable within your local codes; local ordinances will always supersede our recommendations as the unit’s manufacturer. If you have any other product-related inquiries, please contact us directly at 888-GENERAC (436-3722).
answered 1 month ago
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GeneracPowerSystems02
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Question

will a 20kw Guardian series start and run a 5 ton AC unit

will a 2011 20kw guardian series start and run a 5 ton ac unit?
asked 3 years ago
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lady
on 20kW-6730
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Yes, a 20kW Generac Guardian Series can start a 5 ton air conditioning unit. There are other factors that affect sizing, so we recommend talking with an authorized Generac dealer to review all of the items you wish to power. Please find a dealer near you by using our dealer locator at http://www.generac.com/Service/Deal...
State: WI - Wisconsin
answered 3 years ago
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by
Generac
Waukesha
-2points
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Question

How long can this generator run at a single time?

There's a hurricane coming, how long can this generator run if we lose power? The last time our area lost power after a significant storm, it was over a week before power was restored. Can our generator run this long (or longer)?
State: PA - Pennsylvania
Age: 35-44
This product will backup: Other
asked 3 years ago
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JG
Glenmoore
on 20kW-6730
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answer 1
We design standby generators specifically for extended run times, so having it run for a week or longer is definitely possible. Your only limitation is the fuel type, meaning the size of your propane tank or the supply of natural gas. For natural gas at ½ load, the 20kW uses 206 cubic feet per hour. For liquid propane at ½ load, the 20kW uses 1.89 gallons per hour. Refer to the 20kW spec sheet for additional fuel consumption data. http://www.generac.com/SpecSheets/0...

We also recommend stopping the unit and checking the oil after 24 hours of straight operation and performing scheduled maintenance after 200 hours of operation.
State: WI - Wisconsin
answered 3 years ago
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by
Generac
Waukesha
+1point
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Question

How do I turn off at night and back on in morning to preserve fuel?

I have a 20kw Guardian with an automatic transfer switch and would like to turn the unit off at night to save fuel. How do I do this?
State: CT - Connecticut
Age: 45-54
This product will backup: Entire Home
asked 3 years ago
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Kevin
Reding
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answer 1
1. Turn the generator breaker off.
2. Switch the main electrical panel breaker to off.
3. Switch the three position switch to off.
4. Remove the fuse on the control panel. To put the generator back into service, simply follow the process in reverse.
State: WI - Wisconsin
answered 3 years ago
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by
Generac
Waukesha
+1point
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Question

What is the life expectancy of the 20kW Air cooled model? How many hours operation or years od service?

State: TX - Texas
Age: 45-54
This product will backup: Entire Home
asked 3 years ago
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Mitch
Houston
on 20kW-6730
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answer 1
With proper maintenance, it could last up to 3000 hours.
State: WI - Wisconsin
answered 3 years ago
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by
Generac
Waukesha
-12points
1out of 14found this answer helpful.
Question

Help me understand what it will cost per day to run this unit?

If I am understanding this correctly at 1/2 load this unit would consume 1.89 gallons of LP per hour. This would mean that if we lost complete power it would consume around 45 Gallons per day?

The cost for propane in NJ is approximately $3.89 a gallon, This would mean that it would cost around $175 a day? This cant be right can it?

So if we were out for 4 days like we were the last time we went out it would have cost us $700 in fuel for 4 days?

We spend much less than this using our current gas powered generator? Am I just calculating something wrong?
State: NJ - New Jersey
This product will backup: Entire Home
 
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asked 3 years ago
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Tom
NJ
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answer 1
Your logic is correct; however, this is assuming that your generator is constantly running at 1/2 load. There may be times when you are not using as much power in your home, so your actual cost could be less. You can also choose to only operate your generator at certain times, by turning it off manually at the control panel.
State: WI - Wisconsin
answered 3 years ago
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Generac
Waukesha
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Question

How can I ensure that the weekly test took place?

State: TX - Texas
Age: Over 65
This product will backup: Entire Home
asked 3 years ago
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Barks
South
on 20kW-6730
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answer 1
The generator has external indicator lights that show generator status. If the light is green, then the generator has performed its weekly exercise and is ready to operate in an emergency. Otherwise, you could invest in one of Generac's wireless remote monitors. To learn more, visit http://www.generac.com/Residential/...
answered 2 years, 11 months ago
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GeneracPowerSystems
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Question

How much peak power will it provide for starting motors and air conditioners?

State: NY - New York
Age: 55-64
This product will backup: Entire Home
asked 2 years, 11 months ago
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Bill
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answer 1
145 amps at a 30% voltage dip.
answered 2 years, 11 months ago
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GeneracPowerSystems
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Question

Can the life expectancy of this generator be extended past 3000 hours with replacement parts?

The answer to a previous question was "With proper maintenance, it could last up to 3000 hours".
Could the life expectancy of the generator be extended with replacement parts?
Thank you.
State: NY - New York
Age: 45-54
This product will backup: Entire Home
 
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asked 2 years, 10 months ago
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Emma
Stone Ridge
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answer 1
The "3000 hour" mark is not an absolute--only a milestone. The generator can run for a very long time with proper maintenance, and some individual components can be replaced to extend the life of the unit.
answered 2 years, 10 months ago
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GeneracPowerSystems
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Question

How do I turn the exercise time off?

asked 2 years, 10 months ago
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SKC
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answer 1
You cannot turn the exercise cycle off. It is required for the generator to exercise once a week for 10 - 15 minutes to ensure that it will function properly during a power outage. You do have the ability to schedule when this occurs at any time of day or night, but it cannot be disabled.
answered 2 years, 9 months ago
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GeneracPowerSystems
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Question

what is the set back from buildings on the Guardian 20KW? where can I find this info?

State: MA - Massachusetts
Age: 55-64
This product will backup: Entire Home
asked 2 years, 9 months ago
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Mark R
Weston
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answer 1
If your local building codes will allow it, you can install this unit as close as 18" to your home, with a minimum of 5' of clearance on either side. For specific information about how close you can install your generator to the home, please see the owner's manual at http://goo.gl/vodrK. Be sure to consult with your local code authority to make sure that our recommendations comply with local codes.
answered 2 years, 9 months ago
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GeneracPowerSystems
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Question

How many air conditiong units can run on this size generator.

State: NY - New York
Age: Over 65
This product will backup: Entire Home
asked 2 years, 9 months ago
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Ed
Orient Point
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answer 1
This unit can typically run two central air conditioners simultaneously. However, as with any appliance, it depends upon the amount of power the two units draw combined with the other circuits that are being backed up. If this unit is paired with a Nexus Smart Switch, you will be able to load manage two air conditioners without any additional accessories required. What that means is that the Nexus Smart Switch will monitor the electrical load being put on the generator. If it appears as if the generator is approaching overload, perhaps because you're running an unusually high number of appliances in your home at the same time, it will cut power to the central air conditioners and wait until generator capacity returns before switching them back on again. In this way, you can get whole-house backup coverage with a smaller generator.

We recommend discussing your particular application with a Generac dealer. They can look at your particular needs and make a recommendation for you. To find a dealer near you, please visit http://www.generac.com/Service/Deal...
answered 2 years, 9 months ago
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Question

Pad for 20kw unit.

I have just purchased a 20kw unit for a new home that I am having built. Can this unit be placed on a formed plastic like pad or does it need to be concrete or pea gravel?
State: TX - Texas
Age: Over 65
This product will backup: Entire Home
asked 2 years, 9 months ago
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pmedic
In the country.
on 20kW-6730
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answer 1
This unit comes with a composite mounting pad, and if your local codes will allow it, it can be mounted on this pad atop a pea gravel base. Consult your local building code authorities to see if this type of installation is acceptable or if a concrete pad is required.
answered 2 years, 9 months ago
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