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Comparing Heat Generation in Unconnected vs Connected Photovoltaic Panels

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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16185756
    Anonymous
    Level 1  
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  • #2 16185787
    Tech132
    Level 28  
    1) Is it true that an unloaded panel (or even a disconnected panel) will heat up more?

    Yes it is
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  • #4 16186522
    Anonymous
    Level 1  
  • #5 16186626
    3301
    Level 34  
    I think that if no electricity flows, the temperature will not be higher.
    I am currently testing several panels, I connected two in series in two strings and one string came out, the sun was shining, there was some snow and on the one that worked and the current reached 4A, the snow melted and on the one that was disconnected
  • #6 16187330
    prose
    Level 35  
    Unconnected panels do not heat up more unless there is a short circuit on the diodes or a breakdown.
  • #7 16187849
    JESIOTR1
    Level 33  
    Erbit wrote:
    This is not proof that the panels are heating up due to no load. In my consciousness there is a view that increasing the current in the system will cause more heating.

    You have torn the given link into fragments and easily argue, but bit by bit:-

    1. Increasing the current in the system (circuit) within the panel itself (by short-circuiting) results in zero dissipated thermal energy.
    Heating up Q heat of the panel = R of the panel x I? in the whole circuit xt time.

    2. Increasing the current in the system (circuit) within the panel and connected receiver (through connections) causes heat energy to be discharged outside the panel to the receiver - causing cooling.
    Heating Q heat of the panel will be reduced by = R receiver x I? in the whole circuit xt time.

    As for the service life, the panel also has the same parameter as in the battery allowable current e.g. 800A
    When this parameter is exceeded, the wires (board frames) start to heat up, bend, melt and short-circuit damage occurs.
    The same heating destroys the panel (it has nominal operating parameters V and A in time - years) mainly sensitive to the load - Amperage which devastates the electrical circuit of the panel.
    The sun will not melt the glass as quickly as the amperes melt the semiconductors and their links in the panel.
    Therefore, the panel has specific nominal operating parameters, including V and A, and this must be observed.
  • #8 16187957
    Anonymous
    Level 1  
  • #9 16188049
    JESIOTR1
    Level 33  
    Erbit wrote:
    My doubts concern the lack of electricity and the alleged heating for this reason (apparently unclaimed electricity is to be turned into heat).

    He can write the same thing like this:
    (apparently the received electricity is supposed to dissipate thermal energy)
  • #10 16188126
    Anonymous
    Level 1  
  • #11 16188582
    JESIOTR1
    Level 33  
    This electricity is the result of converting heat energy into electricity - it's like turning zlotys into dollars in your pocket and keeping them in your sewn pocket or spending whatever you want to make it lighter. :D
  • #12 16188687
    Anonymous
    Level 1  
  • #13 16188849
    JESIOTR1
    Level 33  
    Electromagnetic radiation is not only light, heat, heating - as in the subject.
    There is a principle: "The principle of conservation of energy" - an empirical law of physics which states that in an isolated system the sum of all energy types in the system is constant over time.
  • #14 16188940
    Anonymous
    Level 1  
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  • #15 16188951
    JESIOTR1
    Level 33  
    Yes - it is read that by connecting the receiver from the PV system, you discharge energy - You cool.
  • #16 16188968
    Anonymous
    Level 1  
  • #17 16188991
    JESIOTR1
    Level 33  
    In this topic, PV is the only Energy Source in any form.
  • #18 16188999
    zbich70
    Level 43  
    Erbit wrote:
    I have the impression that the theory of overheating of unconnected panels is a cliché drawn from the fingers of people who understand the operation of panels just by "converting heat into electricity".

    Dude, the sunlight falling on every cm? of surface provides a certain amount of energy.
    This energy dissipates into the environment. It disperses faster when there are conditions conducive to energy dissipation (drainage) - e.g. air flow or convection.
    Therefore, in a vacuum of space, where there is no convection, heating occurs very quickly. There is no such problem in the Earth's atmosphere.

    But if the amount of energy supplied to the object is greater than the object can discharge into the environment, its temperature will increase.

    On the other hand, the PV panel discharging part of the solar energy obtained in the form of electric current will heat up less than the one disconnected from the receiver.
  • #19 16189384
    Anonymous
    Level 1  
  • #20 16191456
    jaszczur1111
    Level 33  
    JESIOTR1 wrote:
    Erbit wrote:
    .



    1. Increasing the current in the system (circuit) within the panel itself (by short-circuiting) results in zero dissipated thermal energy.
    Heating up Q heat of the panel = R of the panel x I? in the whole circuit xt time.

    2. Increasing the current in the system (circuit) within the panel and connected receiver (through connections) causes heat energy to be discharged outside the panel to the receiver - causing cooling.
    Heating Q heat of the panel will be reduced by = R receiver x I? in the whole circuit xt time.

    As for the service life, the panel also has the same parameter as in the battery allowable current e.g. 800A
    When this parameter is exceeded, the wires (board frames) start to heat up, bend, melt and short-circuit damage occurs.
    The same heating destroys the panel (it has nominal operating parameters V and A in time - years) mainly sensitive to the load - Amperage which devastates the electrical circuit of the panel.
    The sun will not melt the glass as quickly as the amperes melt the semiconductors and their links in the panel.
    Therefore, the panel has specific nominal operating parameters, including V and A, and this must be observed.


    I'm sorry, but that's a bunch of crap. It so happens that I have been using 3kW PV panels for 4 years. The impact of the current consumed on the temperature of the panel surface is negligible in the range of max. current and total short circuit. It so happens that these currents do not differ much from each other. And the theory according to which the removal of electricity from the panel will cause its cooling is total nonsense. An unloaded panel does not generate any power, it only produces an emf. As such, it has nothing to do with power and thus heat. This potential is not discharged in the cell itself.

    Certainly, a loaded panel heats up more due to the internal resistance and the current flowing through it. In practice, the amount of heat emitted may additionally be visible, for example, in the form of faster melting or sublimation of a thin layer of frost (thick one causes too little power generation)

    Due to the fact that excessive temperature shortens the life of loaded PV, some manufacturers place indicators and temperature sensors to protect the panel from power consumption in the event of extremely unfavorable conditions. Also, an increase in PV temperature causes a decrease in the generated voltage. As a side note, I will add that a Polish company offers its customers PV with liquid cooling, which also transfers heat to the CW system. and at the same time increases the efficiency of the PV.

    The analogy to a shorted battery is completely inappropriate.

    Here's some of the issues we're talking about:
    http://easysolar.pl/modern-methods-measuring-temperature-panels-pv-2
    http://www.instsani.pl/PV8.htm

    and here's a little quiz, which is a way of giving information that I don't like but..
    http://www.eco-energia.pl/index.php/14-baza-w...c-w-our-home-one-family-questions-i-odpoknows
  • #21 16191857
    Anonymous
    Level 1  
  • #22 16191930
    JESIOTR1
    Level 33  
    jaszczur1111 wrote:
    Here are some of the issues we are writing about:

    This is not a problem - it is only "ADVERTISING"
    You need to start with the amount of energy that needs to be supplied to heat 1 kg of the pane layer on the panel and how this amount of energy is to be dissipated by the semiconductor layer of the panel to the receivers.
    I estimate the ratio of these energies - not even percentages, but only per mille.
    These two simple phenomena of nature take place simultaneously with complex conditions for heat conduction and current conduction in two different circuits and in different locations, which affects their different temperatures and cooling over time.
    It should be noted that the structure of a panel, e.g. a flexible one (without a layer of glass), is different.
    Such complex phenomena are not measurable outside of laboratory conditions; they can be considered in the knowledge of the empirical laws of physics.
    The sensitivity of the battery and the panel is not comparable.
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  • #23 16192959
    Anonymous
    Level 1  
  • #24 16193226
    JESIOTR1
    Level 33  
    Congratulations on using "a smoother language".
    From school, remind yourself of the experiences.
    https://pl.wikipedia.org/wiki/Kalorymetr
    Then the basics of thermodynamics, perfect conditions and inertia in systems.
    It is not an obligation, but I urge you to do it, and I do not understand everything in physics yet.
  • #25 16193311
    jaszczur1111
    Level 33  
    I understand that the desire to explain this phenomenon through a simple interpretation of the principle of conservation of energy prevails, but in my opinion this is not the way.

    As I was very intuitive, I decided to seek the language of experts - physicists I know and the man who assembles PV installations, also a professional, because I graduated from polytechnic studies. The latter stated in a telephone conversation that there is a cooling effect. I asked him to justify his answer but we had to interrupt the conversation for higher reasons. There will be a continuation, so wait before closing the topic, we'll see what it says. And with other professionals, I will only consult.
  • #26 16194736
    Anonymous
    Level 1  
  • #27 16195189
    JESIOTR1
    Level 33  
    My colleague Erbit - I also want to know the opinion of Professionals, I am open to the exchange of experiences and humbly accept every verdict.
  • #28 16195310
    Anonymous
    Level 1  
  • #29 16195333
    Krzysiek27
    Level 13  
    When you connect electricity to photovoltaic cells with twice the voltage than they can produce, then they heat up and change color, something like accelerated aging :D
  • #30 16195399
    jaszczur1111
    Level 33  
    Finally, there was some kind of funny discussion. I like it. When you connect electricity to PV, it is like connecting a diode in the current circuit in forward direction. By the way, I wonder if such a patent would not be appropriate for defrosting? Of course, under the control of current and temperature.
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Topic summary

The discussion centers around the heat generation of photovoltaic (PV) panels when connected versus unconnected. Participants debate whether unconnected panels heat up more than connected ones, with some asserting that an unloaded panel does not generate heat due to current flow, while others argue that the absence of load leads to higher temperatures. Key points include the role of current in heating, the impact of energy conversion, and the principle of conservation of energy. Several users reference empirical observations, such as the melting of snow on connected panels, to support their claims. Ultimately, a consensus emerges that while current flow does contribute to heating, the effect is marginal compared to solar energy input, and unconnected panels do not inherently heat up more than connected ones.
Summary generated by the language model.
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