Question about Generac Electrical Supplies

3 Answers

I have a 16kw generac guardian that runs smooth when under light load, but when ac kicks on it stumbles and misses. no other load on unit, so well within amperage capacity. How to resolve?

I have led lights as well as Generac load shed modules installed to control overload. I can run every light in house and unit will run smooth. Just when the ac kicks on does it sputter and never smooth out

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  • J Rosado May 30, 2019

    Air con is an inductive load when a motor starts up it needs about six times it's full load amps.
    Your generator, is 16kw the peak power or rms power, average power? Know the difference and stick to rms values.

  • Bill Nelson
    Bill Nelson May 30, 2019

    Thanks for all the input. I replaced both spark plugs even though it was not at a service interval and this cleared the problem. I ran the unit with normal items on in the house/simulated power fail and let the AC cycle as it normally would and the generator ran fine. the generator runs every week on it's normal cycle so was not sure why the spark plugs made the difference.

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  • Master
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Shouldn't run it at more than 55 amps per leg if single phase.
Engine performance condition may be the cause if we'll below gen set ratings.

Posted on May 30, 2019

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  • Generac Master
  • 1,473 Answers

Check for water in fuel or drain fuel tank and carburetor fuel bowl and refill with fresh fuel. Check spark plug gap.

Posted on May 29, 2019

  • Carl Rock
    Carl Rock May 29, 2019

    and valve lash.

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  • Generac Master
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Join and ask here. these guys are pro's https://www.zillerstore.com/

Posted on May 28, 2019

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 17.5KW Generator dies

If this is one of the big "taco cart" portables you need to check that the vent on the gas cap is open when you're running the engine. In the center of the gage on the gas cap is a little knurled knob, turn it counter clockwise (lefty loosey), about a half turn or so and run the generator.
If that doesn't solve your problem add to it here, otherwise please give me a rating I'm trying to build a little credibility here and could use the help.
Carl

Posted on Dec 02, 2008

CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 15kW Generator

That sounds just about right, if the relay contacts get welded together it sometimes takes out the driver on the printed circuit board. As you found out, 12vdc from 23 to 194 makes the transfer switch move to the Generator position, relay not energized makes the ATS move to the Normal position.

You can make a nice test function by installing a 10 amp contact switch in series with either the N1 or N2 terminals. When the switch is open the generator thinks the Normal power has failed.

Regards,
Carl

Posted on Jan 26, 2009

  • 26 Answers

SOURCE: Attempted to start Generac Guardian 15 kw air

I work on these every day. Its either gonna be the rotor or stater, the voltage regulator, but most likely its a bad stepper motor which is the throttle motor, or control board. Thats all that could be causing that so its one of those. If its the rotor or stater thats bad it causes the generator to RPM up because it thinks its not producing enough power due to that. I had the same problem with the same one we just fixed and it was the slip rings on the end of the rotor so bad rotor.

Posted on Jul 09, 2009

  • 172 Answers

SOURCE: I have a Generac XL4000. It rill start but not run right.

If the area you live in has alcohol added to their unleaded gas, then you will probably need to rekit the carbuerator. Also check the spark arrestor for plugging up. Try to find a non alcohol, off road unleaded gas for your generator.

Posted on Jan 21, 2010

  • 1 Answer

SOURCE: When utility power goes out, the transfer switch doesn't transfer

Call an electrician.

Posted on Jan 23, 2010

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Generator hard to start and sputters like its missing


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I have a 16kW Generac Guardian Generator with a 200 amp house service RTS panel (installed 2007). Last night the power went out and the generator started but the unit did not switch to use generator


The problem with the repair service is another matter. Emergency generator and it's switch gear are there for emergency purposes. It has to be exercised periodically. The switch gear should have a toggle switch to simulate a power outage. the switch cuts power to the sensor sensing power from the utility company. This tells the switch gear that power was lost, start the engine and switch over to generator power. Run for a period where engine reached running temperature and switch back to stand by to shut down. Do this periodically, and be grateful the event was not a disaster. Think of your back up electrical system as the spare tire of your car and similar equipment and enjoy your investment. Good people brings you happiness, bad people brings you experience !.

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My answer:

Your Genset is made by GENERAC same as my personal 5500W home unit is. Great service and great Genset!!

I never had any problems with mine other then the Poly gas tank valve stem gasket leaked from day 1, and they replaced it no bones 100% FREE upon request. I also requested both a Service manual and an Operators Manual and they sent me both FREE of charge as well. (I had no manuals with mine either, as I bought my Genset brand new at a garage sale for $300 - great deal)

Just make sure when you call them (as with anyone seeking operator/setup manuals - that you tell them they got LOST in a recent move!) It helps - otherwise they (any company) might ask for a charge for them. Getting pretty bad out there everywhere thanks to you know who!

Call the GENERAC toll free # below anyway - regardless what it says below about the GUARDIAN brand and where to get service. You want the Install / Service manuals only.


Corporate Mailing Address
Generac Power Systems
Hwy. 59 & Hillside Road
P.O. Box 8
Waukesha, WI 53187

GUARDIAN® Inquiries
All GUARDIAN products are sold through and represented by our Independent Dealers, The Home Depot® stores, and GUARDIAN Authorized Service Centers nationwide. For information or questions about GUARDIAN products, please contact one of these representatives. To locate a dealer nearest you, please visit the Dealer Locator page on the GUARDIAN Web site.

Generac® Inquiries / Customer Support
For Information or questions about Generac generators, switchgear products or Generac OHVI® engines, please call the phone # below. If you need immediate assistance, our Customer Support Department is available Monday-Friday, 8:00 a.m. to 5:00 p.m. Central Standard Time.

Phone: 1-888-GENERAC > 888-436-3722
Fax: 1-262-968-3791

Please post me a reply as to finding this solution being the best resolve to your GENERAC / GUARDIAN service manuals problem by following my recommendations above. Also please rate my troubleshooting fix as well.

Keep me posted and I'll follow up as well.

Best regards,

Frank

Sep 06, 2008 | Electrical Supplies

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