Generac Guardian™ 8kW Standby Generator System (50A 10-Circuit Automatic Switch)

Generac Guardian™ 8kW Standby Generator System (50A 10-Circuit Automatic Switch)
Model: 6237
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  • Product Description
  • 62
    Reviews
  • 26
    Product Q&A
  • Recommended Accessories
  • How-To Articles
  • Manuals
Product Description
+
Grade
Style
Run Watts
8,000
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."

Features
Features
  • Fully Automatic Operation
  • Operates On Clean Burning, Efficient Natural Gas or LP (Vapor)
  • Generac OHVI Air-Cooled Engine
  • Features plateau honed cylinder walls and plasma-moly rings
  • Full pressure lubrication system w/ 2 year oil change interval
  • Skewed Rotor Design For Smooth Output Waveform "Clean Power"
  • Automatic voltage regulator equipped for +/- 1% regulation
  • Evolution™ Digital Controller Monitors & Controls All Functions
  • Provides system status for wireless monitors & Mobile Link™
  • Sound Attenuated Weather Proof Enclosure
  • Attractive styling with lockable access doors
  • Incorporates electrostatically applied epoxy paint technology
  • Sound dampening enclosure limits sound pressure to a low 62dB(A)
  • Includes 10 Circuit Load Center Style Auto Transfer Switch (50A)
  • 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
  • 12" flexible fuel line and manual included
  • Built-in Battery Charger (Battery Sold Separately)
  • 5-Year Limited Warranty & 24/7/365 Customer Care
Specifications
Engine
Engine Brand
Generac OHVI
CC
410 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
8000 Watts
Rated Watts
8000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
7000 Watts
LP Power Capacity
8000 Watts
NG Fuel Consumption @ 50% Load
77 ft³/hr
NG Fuel Consumption @ 100% Load
121 ft³/hr
LP Fuel Consumption @ 50% Load
0.94 gallons/hr
LP Fuel Consumption @ 100% Load
1.42 gallons/hr
Rated Amps
33 Amps
Decibel Rating @ 7m
62 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
50-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
Transfer Switch Style
Pre-Wired (10-Circuit)
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
3
20A 120V
3
20A 240V
1
30A 240V
1
Overview
Made in USA
Yes
Weight
350 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
UPC
696471062373
Grade
Style
Run Watts
8,000
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."

Features
Features
  • Fully Automatic Operation
  • Operates On Clean Burning, Efficient Natural Gas or LP (Vapor)
  • Generac OHVI Air-Cooled Engine
  • Features plateau honed cylinder walls and plasma-moly rings
  • Full pressure lubrication system w/ 2 year oil change interval
  • Skewed Rotor Design For Smooth Output Waveform "Clean Power"
  • Automatic voltage regulator equipped for +/- 1% regulation
  • Evolution™ Digital Controller Monitors & Controls All Functions
  • Provides system status for wireless monitors & Mobile Link™
  • Sound Attenuated Weather Proof Enclosure
  • Attractive styling with lockable access doors
  • Incorporates electrostatically applied epoxy paint technology
  • Sound dampening enclosure limits sound pressure to a low 62dB(A)
  • Includes 10 Circuit Load Center Style Auto Transfer Switch (50A)
  • 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
  • 12" flexible fuel line and manual included
  • Built-in Battery Charger (Battery Sold Separately)
  • 5-Year Limited Warranty & 24/7/365 Customer Care
Specifications
Engine
Engine Brand
Generac OHVI
CC
410 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
8000 Watts
Rated Watts
8000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
7000 Watts
LP Power Capacity
8000 Watts
NG Fuel Consumption @ 50% Load
77 ft³/hr
NG Fuel Consumption @ 100% Load
121 ft³/hr
LP Fuel Consumption @ 50% Load
0.94 gallons/hr
LP Fuel Consumption @ 100% Load
1.42 gallons/hr
Rated Amps
33 Amps
Decibel Rating @ 7m
62 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
50-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
Transfer Switch Style
Pre-Wired (10-Circuit)
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
3
20A 120V
3
20A 240V
1
30A 240V
1
Overview
Made in USA
Yes
Weight
350 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
UPC
696471062373
Product Specs
+
Specifications
Engine
Engine Brand
Generac OHVI
CC
410 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
8000 Watts
Rated Watts
8000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
7000 Watts
LP Power Capacity
8000 Watts
NG Fuel Consumption @ 50% Load
77 ft³/hr
NG Fuel Consumption @ 100% Load
121 ft³/hr
LP Fuel Consumption @ 50% Load
0.94 gallons/hr
LP Fuel Consumption @ 100% Load
1.42 gallons/hr
Rated Amps
33 Amps
Decibel Rating @ 7m
62 dbA
Transfer Switch
Automatic (Included)
Transfer Switch Amperage
50-Amps
Enclosure
Steel
Battery
Not Included (525 CCA)
Transfer Switch Style
Pre-Wired (10-Circuit)
ATS Service Disconnect
No
Cooling System
Air Cooled
UL Listed
Yes
Grade Type
Emergency
Transfer Switch Circuits
15A 120V
3
20A 120V
3
20A 240V
1
30A 240V
1
Overview
Made in USA
Yes
Weight
350 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
25 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
UPC
696471062373
Reviews
(62)
+
Generac Guardian 6237 Reviews & Ratings
92% of Reviewers Recommend This Product
Product Q&A
(26)
+
I have a 5th wheel trailer and wish to install an 8k gen. In the belly. Will probably use propane to power it. Can you put a home standby unit in an RV if it will fit ? .....the home units are so much cheaper ! Which brand you recommend for this, either home style or actual RV style ? Thanks !
Rich Stephens 
from Missouri 
June 27, 2016
Read Response +
Answer
The standby generators must be permanently installed where there is utility power available due to the control wiring from the Automatic Transfer Switch and Generator. The only option would be an RV style unit.

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Are there recommended installation distances from other items? I have an AC unit near where I would like to place the generator. Also, would it be okay to be under a porch? There is about 5' from the ground to the bottom of the porch.
Matt 
from Pennsylvania 
June 18, 2014
Read Response +
Answer
The minimum distances can be found in the installation guide we have available on the site on the product page under the specs tab in the download document section.....

Installation Guide

The unit needs at least 3 feet clearance on the sides of the unit for proper air flow and 3 feet from the front for proper maintenance. Also, the unit requires a minimum of 5 feet clearance from the top of the unit. These units cannot be installed under a porch. These units also require a minimum of 5 feet from any window, door or ventilation opening.

We recommend you consult with your local inspector or AHJ (Authority Having Jurisdiction) for your local code requirements as they can sometimes supersede the manufacturers recommendations.
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I'm interested in the Generac 14 kw standby generator and I want to power it with natural gas. All your other Generac standby generators show a wattage loss of about 2kW when powered with natural gas, but this one does not show a loss in the specs I have reviewed. Is this a misprint in the specs or is this a true output? If I power it with natural gas will it deliver 12 kW or 14 kW?
Albert Leblanc 
from Michigan 
May 06, 2014
Read Response +
Answer
This is not a misprint in the specification. The unit will produce 14kW when operating on Natural Gas and LP as tested at the factory.

Also noted on the manufacturers specification sheets is the following....

"Maximum wattage and current are subject to and limited by such factors as fuel BTU/megajoule content, ambient temperature, altitude, engine power and condition, etc. Maximum power decreases about 3.5 percent for each 1,000 feet (304.8 meters) above sea level; and also will decrease about 1 percent for each 6° C (10° F) above 16° C (60°F)."

Specification sheets can be found on the individual product pages under the Specs tab and within the download document section.
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Is the housing for Generac Home Standby Generators (Model 6437) fireproof?
Robert C. Vose III 
from Massachusetts 
April 26, 2014
Read Response +
Answer
The following information can be found in the installation manual and the installation guide we have available on the product page under the specs tab in the download document section.....

INSTALLATION GUIDE

The National Fire Protection Association has a standard for the installation and use of stationary combustion engines. That standard is NFPA 37, its requirements limit the spacing of an enclosed generator set from a structure or wall (Figure 1.10).

NFPA 37, Section 4.1.4, Engines Located Outdoors: Engines, and their weatherproof housings if provided, that are installed outdoors shall be located at least 5ft. (1.52m) from openings in walls and at least 5ft. (1.52m) from structures having combustible walls. A minimum separation shall not be required where either of the following conditions exist:

1. The adjacent wall of the structure has a fire resistance rating of at least 1 hour.
2. The weatherproof enclosure is constructed of noncombustible materials and it has been demonstrated that a fire within the enclosure will not ignite combustible materials outside the enclosure.
Annex A — Explanatory Material
A4.1.4 (2) Means of demonstrating compliance are by means of full scale fire test or by calculation procedures.

Because of the limited spaces that are frequently available for installation, it has become apparent that exception (2) would be beneficial for many residential and commercial installations. With that in mind, the manufacturer (Generac) contracted with an independent testing laboratory to run full scale fi retests to assure that the enclosure will not ignite combustible materials outside the enclosure.

NOTE: SOUTHWEST RESEARCH INSTITUE TESTING APPROVES 18IN. (457mm) INSTALLATION MINIMUM FROM STRUCTURE. SOUTHWEST RESEARCH IS A NATIONALLY RECOGNIZED THIRD PARTY TESTING AN LISTING AGENCY.

The criteria was to determine the worst case fire scenario within the generator and to determine the ignitability of items outside the engine enclosure at various distances. The enclosure is constructed of NON-COMBUSTIBLE materials, and the results and conclusions from the independent testing lab indicated that any fire within the generator enclosure would not pose any ignition risk to nearby combustibles or structures, with or without fire service personnel response.

SOUTHWEST RESEARCH INSTITUTE DECAL (LOCATED INSIDE THE GENERATOR, NEXT TO THE GENERATOR'S DATA DECAL)

SwRI Website Link

BASED ON THIS TESTING AND THE REQUIREMENTS OF NFPA 37, SEC 4.1.4., THE GUIDELINES FOR INSTALLATION OF THE GENERATORS LISTED ARE CHANGED TO 18IN. (457mm) FROM THE BACK SIDE OF THE GENERATOR TO A STATIONALY WALL OR BUILDING. For adequate maintenance and airflow clearance, the area above the generator should be at least 5FT (1.52m) with a minimum of 3ft. (.91m) at the front and ends of the enclosure. This would include trees, shrubs and vegetation shorter than 12in. (305mm) in height. Vegetation taller than 12in. (305mm) in height must have a clearance of 60in. (1524mm). Vegetation not in compliance with these clearance parameters could obstruct air flow. In addition, exhaust fumes from the generator could inhibit plant growth. See Figure 3.1 and the installation drawing within the owner’s manual for details.

Generator exhaust contains DEADLY carbon monoxide gas. This dangerous gas can cause unconsciousness or death. Do not place the unit near windows, doors, fresh air intakes (furnaces, etc.) or any openings in the building or structure, including windows and doors of an attached garage.
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What are the 2 flexible conduit sizes coming off the transfer switch? Transfer switch that comes with the Model 6237
Alan Butts Butts Electric Inc 
from Oregon 
March 26, 2014
Read Response +
Answer
Here are the conduit sizes for generator model 6237....

30’- ¾” conduit
2’ – 1” conduit
5’ – ¾” conduit
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Jim, this year has been colder then normal and my Generac doesn't want to turn over. Is there something I can do to prevent this in future years?
Frank Newman 
from Minnesota 
March 03, 2014
Read Response +
Answer
If you are running the unit off of a LP tank it could be the issue as LP tanks lose BTU output when the temperature drops and an 8kW model, at start-up, requires 128,865 BTU/HR. The minimum tank size for a zero degree area would be 250 gallons as it can output 169,200 BTU/HR.

The other option offered by Generac is their Cold Weather Kit which has a battery warming pad and an oil heater which requires the use of Synthetic 5W30 Oil.

Cold Weather Kit - Model 6212-0
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Is it possible to upgrade the 50A 10 circuit ATS on Generac model 6237 to the 100A 14 circuit model RTG14EZA1 or are these shipped from the factory prepackaged?
Thomas Williams 
from New York 
February 18, 2014
Read Response +
Answer
All of the packaged models are prepackaged by the manufacturer and cannot be changed out. If you need the 14 circuit switch you would need to purchase the generator by itself and the switch separately. Here are the links for each individual item, just add them to the cart for final pricing....

Model 6245 - 8kW Generator Only

Model RTG14EZA1 - 14 Circuit ATS
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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?
Ed  
from Pennsylvania 
February 06, 2014
Read Response +
Answer
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.
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Hi Jim, I need to know if this will work for my house? Model 6237 I have 200 amp service but I really don't have to have one that big, so Im not looking to run everything. Just enough to get by until the power comes back on. What do you think? I have an outside box but I think I can just run this to my inside box that is where everything I want power is located in case of a power outage. Will this one run my ac unit or not?
Tim  
from Illinois 
January 11, 2014
Read Response +
Answer
The Generac 8kW generator can adapt to any installation application as the generator will only power the circuits connected to the essential circuit transfer switch. This is as long as the generator has the output capacity to handle the circuits that are being connected. Something of this size will not handle starting amperage loads on central AC systems.

Please note that proper sizing of the generator is crucial to the success of any generator 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.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

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 capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications that are commercial, all-electric homes, 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.
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I have purchased the 6237 Generac from you and I have one question. The gas line running to the generator galvanized or black pipe which do you feel is better?
Ed Smith 
from Pennsylvania 
January 03, 2014
Read Response +
Answer
Per the manufacturer black pipe is recommended, however you must comply with NFPA 54 (Natural Gas) or NFPA 58 (Propane) for proper sizing and installation.

Here are the pipe sizing minimum requirements per Generac for model 6237....

Natural Gas Pipe Sizing

3/4 Inch - Max 55 Feet
1 Inch - Max 200 Feet

Liquid Propane Vapor Pipe Sizing

3/4 Inch - Max 165 Feet
1 Inch - Max 570 Feet

**Add 2.5 ft. per any bend, tee or angle in the pipe to overall distance.
**Pipe sizes are using a second stage regulator.

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.
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Would winter time installations of automatic generators be good or bad?
Ron Mills 
from Michigan 
December 30, 2013
Read Response +
Answer
You can install a generator at any time. However, it would be based on if you are putting down a concrete base as it will not set in cold temperatures. If you are putting down crushed stone or pea gravel it should be no problem.

You can also go with a GenPad (Gen Manufacturer Specific) which is a preform concrete base, so no concrete curing time. These can be installed in any temperature.

Generac GenPads
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I have a low pressure nat. gas line in my residence, what is the largest generator I will be able to run without doing major updates ?
Chuck 
from Ohio 
December 10, 2013
Read Response +
Answer
The Generac line of home standby systems can now operate on low pressure natural gas. Their low fuel pressure requirement is 3.5" to 5" of water column (1" of water column = 0.036 PSI).....0.123 PSI to 0.18 PSI. This would be for all sizes from 8kW up to 20kW.

Proper sizing of the generator is crucial to the success of any generator 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.

A certified electrician needs to be consulted for proper sizing and installation of any generator.

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 capacity and will provide a margin of flexibility if the load increases in the future.

Note: Applications such as commercial, all-electric homes, 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.
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If I'm not around when my home standby generator is running, what type of protections systems do the Generac units have?
Josh 
from New Jersey 
November 13, 2013
Read Response +
Answer
The generator may have to run for long periods of time with no operator present to
monitor the engine/generator conditions. Therefore, the generator is equipped with a number of systems to automatically shut down the unit to protect it against potentially damaging conditions. Some of these systems are as follows:

• Low Oil Pressure Sensor
• High Temperature Sensor
• Overcrank Sensor
• Overspeed Sensor
• RPM Sensor
• Under-frequency Sensor
• Undervoltage Sensor
• Overvoltage Sensor
• Internal Failure Sensor
• Low Battery Voltage Alarm

The control panel contains a display which alerts the operator when a fault condition occurs. The above list is not all inclusive. For more information about alarms and control panel operation, see Section 3 (Operation) in the owner's manual.
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What type of oil should I use in my Generac home standby generator?
Jim 
from Illinois 
November 11, 2013
Read Response +
Answer
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.
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I'm not sure if this falls into the repair area but, I'm concerned about the sound this generator produces. Is there a way to lower that? Is there sound proofing approved for use for the interior walls of this type of home standby? My neighbors bedroom window will be 20ft from where I plan to install the generator. I would prefer doing something inside the generator as apposed to some type of fencing or other external methods.
Mark H. 
from New Jersey 
October 23, 2013
Read Response +
Answer
The manufacturers make every effort to reduce the sound of their generators as best they can keeping within NFPA and UL requirements. There are currently no options or parts available to install inside home standby systems to reduce their db(A) levels.

Your only option is location or sound barriers installed around the unit while keeping within NFPA and manufacturers distance requirements for proper fire protection, air intake and exhaust output.

We recommend consulting with your local inspector or AHJ (Authority Having Jurisdiction) as to the specific local code requirements.
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I have a new 2013 Generac generator and I'm wondering what oil it came with? I would like to top it off properly after the installation.
John 
from New Jersey 
October 18, 2013
Read Response +
Answer
The Generac 2013 automatic standby generators are shipped with a SAE 30 non-synthetic oil. If you are located in an area that receives snow, it is recommended to perform an oil and filter change to switch to a synthetic 5W-30 oil to promote proper generator operation. The cold weather kit is also recommended.

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 any break in, so if the Maintenance Schedule in the owner's manual indicates that oil changes only need to be done every 2 years or 200 hours, you could drain the existing oil and switch to synthetic 5W-30 right away.
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Jim, I'm purchasing the Generac 6237 8KW, but I have no need for either a 20A/240V or 30A/240V breaker in the transfer switch emergency circuit panel, since my furnace, hot water heater, clothes dryer and range are NG. I and my electrician would like to swap out these two-pole 240V breakers for 15A/120V and 20A/120V single-pole breakers. What model, series and type number breakers should we buy so that we're prepared when the generator arrives? Thanks!
Tom Steidel 
from Pennsylvania 
October 13, 2013
Read Response +
Answer
Tom, Thank you for your inquiry....

With the Generac prewired switches Generac states you cannot alter the 240V circuits into 120V circuits as this will void the UL listing on the switch and the warranty on the generator for improper installation.

The way around this issues is to purchase the generator by itself and then get a larger switch that will accommodate the quantity of 120V circuits you need.

Your other options are to either purchase a larger generator that comes with the appropriate switch or purchase either the Briggs or Kohler units where this does not make a difference.

Briggs - Model 40445 - 8kW with 16 Circuit Switch

Kohler - Model 14RESAL - 14kW with 16 Circuit Switch
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Jim, I am looking at the Generac 6241 and 6237. I do not want to install a full propane tank at home. Can the unit be easily hooked up to individual 5 gal. propane tanks? As a backup, I am looking at the Generac 7500 Watt ($999) gasoline fueled unit...why cannot it not be shipped to CA? THX
Alan 
from California 
August 28, 2013
Read Response +
Answer
You cannot hook the home standby generators to 5 gallon propane tanks, you must install a minimum 100-150 gallon tank for them to operate properly.

Some generators cannot be shipped to CA because they do not meet the CA CARB compliance laws. The following link shows available models that can ship to CA.....

CARB Compliant Generators
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What is the recommended time frame to change the break-in oil on my Generac 20kW generator?
Karin Green 
from New Jersey 
August 10, 2013
Read Response +
Answer
All of the new 2013 Generac Home Standby generators have been pre-run at the factory for 25 hours. So, no break-in period is required.
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I'm interested in the Generac Guardian 8kW generator using natural gas. What size gas line does it require?
Anthony Crego 
from New Jersey 
August 07, 2013
Read Response +
Answer
Thank you for your inquiry.....

The fuel pipe size is determined by the distance from the fuel source with the generator being the first item after the meter.

The installation guide contains the following information.....

7-8kW Natural Gas Pipe Sizing

3/4 Inch - Max 55 Feet
1 Inch - Max 200 Feet

7-8kW Liquid Propane Vapor Pipe Sizing

3/4 Inch - Max 165 Feet
1 Inch - Max 570 Feet

**1/2 inch pipe is too small and cannot be used.
**Add 2.5ft. per any bend, tee or angle in the pipe to overall distance.
**Pipe sizes are using a second stage regulator.

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.
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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?
Nick Gianacoplos 
from Connecticut 
July 23, 2013
Read Response +
Answer
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 recommend a minimum of 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 Briggs & Stratton 8kW if you plan on having the unit closer to the house since it has a steel enclosure.

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.
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Transfer panel wires that come with the model 6237 generator are of what size
Robert Selle 
from New Jersey 
July 09, 2013
Read Response +
Answer
The indoor run from the switch to the wall where you go out to the generator is 30 feet and the run from the switch to your electrical panel is 2 feet. The generator also has an outdoor run of 5 feet connected to the back of the generator along with an outdoor connection box to connect the 30 foot length to where you penetrate the wall.

Per Generac you can add an additional maximum of 15 feet to any of the 3 lengths if needed.

The control wires are 14 gauge, the 2 hots and neutral are #6 and the ground is #8.
Hide Response -
What if distance to generator is longer than 30' flex. Can I order from you the amount needed? Is the transfer switch recessed or surface mount?
Darin  
from Washington 
July 04, 2013
Read Response +
Answer
The unit comes packaged only one way so upgrading the wiring harness is not an option prior to purchasing.

You can add a maximum length of 15 feet to the existing run as long as local code allows. If you need more then this length the entire run of wiring must be changed which means all of the wiring from switch to generator and switch to electrical panel.
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What is the difference between the Generac model 5870 and their new model 6237 since they are the same size?
Josh 
from Illinois 
May 23, 2013
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Answer
Generac went ahead and improved on the design, warranty and ease of installation after listening to consumer reviews and technicians.

They bumped up the warranty an additional 2 years to give it a solid 5 year overall which is one of the highest rated on the market.

They improved on the generator controller by upgrading to a new technology and moved from their very good Nexus design to the new and improved Evolution controller. This new controller has a back-lit interface with LED's that shows the generator status at a glance.

The new Evolution controller includes maintenance reminders and logs, battery condition (no guessing) and over a half-dozen additional alarms the Nexus controller did not have. This thing rocks!

They upgraded the engine to include a no choke carburetor which helps with all weather starting. They changed the fuel selector for natural gas and LP to an easy knob that is easy to access and change fuel type with ease (No tools required).

For the installers they made several changes to help with installation costs and time, minimize errors and accommodate current and future electric code interpretations by re-engineered some of the wiring connections.

With the changes to the carb and engine they were able to change the low fuel pressure rating for Natural Gas down from 5" of Water Column to 3.5" of Water Column. This will help tremendously with low fuel pressure areas in the country so the meters do not need to be changed as often.

With all of these upgrades they have performed I believe Generac's newest model is one of the best out there and comes highly recommended.
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Hi Jim, How long will this unit run on a 100lb lp tank?
Kevin Jackman 
from Rhode Island 
May 17, 2013
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Answer
Run time will be dependent on the load put on the generator. The unit has the following LP fuel usage.....

1/2 Load Output - 0.87 Gal/Hr
Full Load Output - 1.42 Gal/Hr

Generac Spec Sheet
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Can the Nexus 200 amp Smart Switch be installed with a smaller (8KW) generator? We may be limited to the smaller generator due to propane supply issues, but love the load shedding concept.
Jim White 
from Connecticut 
May 12, 2013
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Answer
Typically a smaller 8000 watt generator does not have the output capacity to handle a whole house application even when using the load control manager. The constant turning on and off equipment that the generator will never be able to run can be extremely harmful to the generator and to your equipment such as your AC or other larger loads.

We recommend consulting with a certified electrician to properly size the generator based on your actual needs and equipment in your home.

Yes, you can use the whole house switch but it is not recommended with a 8000 watt generator which is why manufacturers do not prepackage them together.

The 10kW unit is the largest prepackaged model that includes the whole house transfer switch but is also available with a select circuit.

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