Question about Generac 5606 XP Series XP8000E 12,000 Watt 410cc OHV Portable Gas Powered G

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During a recent power outage I could not use my computers when they were hooked up to their battery backups (UPS)and the generator was being used. I have a proper transfer switch with 12 breakers. They would work fine if I bypassed the UPS. This prompted me to get out my Fluke meter and check the generator output. My generator produces 123 volts at 63 Hz. If I adjust the governor to get down to 60 Hz the voltage drops to 106. I would have expected a proportional change in voltage which would have given me 117 volts. Any ideas?

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  • sho11 Jan 31, 2010

    My meter is a true RMS meter (Fluke 87). When I plug it into an outlet under normal conditions I get 120 volts and 60 Hz so I'm guessing the meter is pretty accurate.

    If I understand you correctly you think voltage is important and freq is not. So should I adjust the governor to 120.

    You also mentioned that the two are independant. Is there a way to adjust then independantly?

    The other half of the question was why my UPS would not work when powered by the generator at 123 and 63 Hz. Any ideas? I have three UPS and none of them would feed the power from the generator through to their outlets. They just clicked and cycled on and off. One of the three failed completely and I've had to replace it.

  • sho11 Feb 02, 2010

    I don't understand this response. The generator only puts out as much current as the items connected to it require. Obviously the UPS has been handling the current draw just fine. As a matter of fact it is rated at 450 watts and I have a pretty normal PC, monitor and printer hooked up to it. I don't think that is a problem. The UPS may have blown when the power went out and a tree fell through the power lines. But there are two other UPS units in the house hooked up to two other computers. They wouldn't work on the generator either but worked fine once more when the power came back on.

    I'm still trying figure out if the 123 volts or the 63 Hz is a problem. My transfer switch/panel has two watt meters on it and combined the read about 3500 watts when nearly everything in the house is running. This is an 8000 watt generator. I used to run the computer on my 1000 watt generator.

  • sho11 Feb 02, 2010

    You can keep trying to explain but I'm afraid I am losing faith. Maybe we are talking about two different things. As I stated before current is a function of the load, not the capacity of either the generator or the UPS. The UPS doesn't draw anything, its just a surge protector if there is power applied to it and it shouldn't matter if that power is coming from the power company or a generator.



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Is the 123 Volts an RMS value (peak value) or an average value that you were measuring off of the generator with the meter? The voltage and frequency don't really depend on each other as you can run any voltage at any frequency. What is important is that you are running the generator at the correct voltage (the frequency won't make much difference in the operation of the electronics as long as it isn't a huge change such as running at 10000 Hz or something). You should be reading a peak value of 120*sqrt(2) = 170 volts from the meter. So if you get it running at 170 volts (peak value) or 120 volts (average value), then there should be enough voltage to run the electronics.

Let me know how this works out for you.


Posted on Jan 31, 2010

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  • Benjamin Patri
    Benjamin Patri Jan 31, 2010

    Have you measured how much current is coming from the generator when you have everything hooked up? It sounds like the UPS systems are the problem and can't handle what the generator is supplying is one of them already burnt out. I would check the ratings on the UPS that you are using and then make sure that it is within limits of what the generator is sending to it.

    Let me know what you find.

  • Benjamin Patri
    Benjamin Patri Jan 31, 2010

    Sorry bad wording in my previous comment.

    Have you measured how much current is coming from the generator when you
    have everything hooked up? It sounds like the UPS systems are the
    problem and can't handle what the generator is supplying WITH one of them
    already burnt out. I would check the ratings on the UPS that you are
    using and then make sure that it is within limits of what the generator
    is sending to it.

  • Benjamin Patri
    Benjamin Patri Feb 02, 2010

    Alright, right there is your problem, you have a 8000 watt generator and only have 3 UPS units that can handle 450 watts each, That is a HUGE difference, your generator is probably kicking out too much power to the UPS units. Watts is a unit of power. Have you checked the amperage rating (amps) or unit of Current (I) that is going from the generator to the UPS systems like I asked you to do before? Fuse box breakers blow or break when there is too much current. Check your CURRENT please that is coming from the generator to the UPS units. To do this, you need to connect the meter in line with the generator to the UPS.

    Please let me know if you are still confused and I will try to explain it a different way, but basically you need to check the Current (amps) and not the power (watts).

  • Benjamin Patri
    Benjamin Patri Feb 03, 2010

    True it shouldn't normally matter where the power is coming from, but if you have no breaker in between the UPS and the generator, then you may have too much current. If you want to try and explain your problem to another expert, go ahead. I hope you get it fixed, but I still believe you are having too much current running to the UPS which is why they would fry.

    Let me know if you need anything else.



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