Achieving MPPT of a solar panel with LM2596

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5












$begingroup$


im having some trouble with DC converters in a solar system.
I have a solar panel of 21V (Voc) and 1.33 (Isc).
I have studied that with a DC buck converter with input regulation (Feedback loop taken from the input) would result in a fixed output and equal to the MPP.



The thing is that i have a LM2596 adjustable regulator , and i was thinking about soldering the resistor divider taken from the output of the original topology, and take the input as a source.
Could I get the MPP voltage and current?
If yes, how could i calculate?



I attach the datasheet from Texas.
http://www.ti.com/lit/ds/symlink/lm2596.pdf



Original Topology



Original Topology from Texas



Edit: The objetive is to charge a battery pack of 3 Li-Ion cells efficiently, firstly mppt step is where my doubts are.










share|improve this question











$endgroup$
















    5












    $begingroup$


    im having some trouble with DC converters in a solar system.
    I have a solar panel of 21V (Voc) and 1.33 (Isc).
    I have studied that with a DC buck converter with input regulation (Feedback loop taken from the input) would result in a fixed output and equal to the MPP.



    The thing is that i have a LM2596 adjustable regulator , and i was thinking about soldering the resistor divider taken from the output of the original topology, and take the input as a source.
    Could I get the MPP voltage and current?
    If yes, how could i calculate?



    I attach the datasheet from Texas.
    http://www.ti.com/lit/ds/symlink/lm2596.pdf



    Original Topology



    Original Topology from Texas



    Edit: The objetive is to charge a battery pack of 3 Li-Ion cells efficiently, firstly mppt step is where my doubts are.










    share|improve this question











    $endgroup$














      5












      5








      5





      $begingroup$


      im having some trouble with DC converters in a solar system.
      I have a solar panel of 21V (Voc) and 1.33 (Isc).
      I have studied that with a DC buck converter with input regulation (Feedback loop taken from the input) would result in a fixed output and equal to the MPP.



      The thing is that i have a LM2596 adjustable regulator , and i was thinking about soldering the resistor divider taken from the output of the original topology, and take the input as a source.
      Could I get the MPP voltage and current?
      If yes, how could i calculate?



      I attach the datasheet from Texas.
      http://www.ti.com/lit/ds/symlink/lm2596.pdf



      Original Topology



      Original Topology from Texas



      Edit: The objetive is to charge a battery pack of 3 Li-Ion cells efficiently, firstly mppt step is where my doubts are.










      share|improve this question











      $endgroup$




      im having some trouble with DC converters in a solar system.
      I have a solar panel of 21V (Voc) and 1.33 (Isc).
      I have studied that with a DC buck converter with input regulation (Feedback loop taken from the input) would result in a fixed output and equal to the MPP.



      The thing is that i have a LM2596 adjustable regulator , and i was thinking about soldering the resistor divider taken from the output of the original topology, and take the input as a source.
      Could I get the MPP voltage and current?
      If yes, how could i calculate?



      I attach the datasheet from Texas.
      http://www.ti.com/lit/ds/symlink/lm2596.pdf



      Original Topology



      Original Topology from Texas



      Edit: The objetive is to charge a battery pack of 3 Li-Ion cells efficiently, firstly mppt step is where my doubts are.







      solar-cell buck mppt






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 5 at 22:07







      MDuarte

















      asked Mar 5 at 12:37









      MDuarteMDuarte

      285




      285




















          4 Answers
          4






          active

          oldest

          votes


















          7












          $begingroup$

          Although MPPT trackers are based around typically a buck converter, there's additional actions from a control loop, in hardware or programming, that actively tracks the point where maximum power is being drawn from the cell - this varies a little with solar intensity, so you might find a fixed voltage that is good enough for most conditions, but it also varies a lot with cell temperature, so the controller does need to be able to compensate.



          Since the solar intensity and cell temperature can vary, an MPPT tracker constantly adjusts the set point up and down, and compares the power generated, and aims to settle at the peak.To be able to vary the input, the controller changes the duty cycle of the buck converter, but obviously this assumes that the load (the battery pack) is capable of taking the full output, and once the battery reaches full charge the controller needs to limit the output voltage too, and the power available at the solar cell goes unused. Regulating only the input voltage would risk overcharging.



          Increasing the duty cycle increases the load and decreases the voltage at the solar cell, and a simple regulator wired with the feedback at the input would do the opposite.



          You're far batter off getting a dedicated MPPT controller.






          share|improve this answer









          $endgroup$












          • $begingroup$
            Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
            $endgroup$
            – MDuarte
            Mar 5 at 22:04


















          4












          $begingroup$

          I doubt that would work, the output will start to oscillate trying to compensate the error.



          If you want to do MPPT on your solar panel, perhaps the easier way is to use devices that are made for that.



          One way of doing so is to use a buck topology to which the switching is controlled by a MCU and to write some simple MPPT algo.






          share|improve this answer









          $endgroup$




















            2












            $begingroup$

            The MPP is not a fixed point but is highly depending on the amount of light shining on the panel.
            A MPP-Tracker is always checking the input power, slightly changing the point on the IU-curve and checking the resulting power again. By comparison of the power values the Tracker is able to determin, if the MPP is reached or if the point on the curve has to be shifted a bit.



            This means, that you are not able do set a fixed value for your converter.






            share|improve this answer









            $endgroup$




















              1












              $begingroup$

              If you put no load on a solar panel at all, the voltage is maximum but the current is zero. If you short out a solar panel, the current is maximum but the voltage is zero. The power is the product of the current and the voltage.



              The point of MPP tracking is to figure out the amount of load on the solar panel that maximizes the power produced by the solar panel. Since different MPPs will result in different voltages produced by the solar panel, this requires some kind of voltage converter that can take whatever voltage the MPP happens to be and make it useful.



              If, for example, you are using 12V batteries and a solar panel whose MPP tends to be around 26 volts, a buck converter will do. But you need something to adjust the load the converter places on the panel to find the MPP. MPP trackers typically have software that varies the converter parameters and measures the voltage across the panel and the current it is supplying to discover the configuration that maximizes the power delivered. That's what MPPT is.



              This requires discovery as the light on the panel changes. Sometimes it is brighter, sometimes it is dimmer. This results in changes to the maximum power point that must be discovered by varying the load the converter places on the panel.



              Without any device to actually do the MPP tracking, you will not track the MPP.






              share|improve this answer









              $endgroup$













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                4 Answers
                4






                active

                oldest

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                4 Answers
                4






                active

                oldest

                votes









                active

                oldest

                votes






                active

                oldest

                votes









                7












                $begingroup$

                Although MPPT trackers are based around typically a buck converter, there's additional actions from a control loop, in hardware or programming, that actively tracks the point where maximum power is being drawn from the cell - this varies a little with solar intensity, so you might find a fixed voltage that is good enough for most conditions, but it also varies a lot with cell temperature, so the controller does need to be able to compensate.



                Since the solar intensity and cell temperature can vary, an MPPT tracker constantly adjusts the set point up and down, and compares the power generated, and aims to settle at the peak.To be able to vary the input, the controller changes the duty cycle of the buck converter, but obviously this assumes that the load (the battery pack) is capable of taking the full output, and once the battery reaches full charge the controller needs to limit the output voltage too, and the power available at the solar cell goes unused. Regulating only the input voltage would risk overcharging.



                Increasing the duty cycle increases the load and decreases the voltage at the solar cell, and a simple regulator wired with the feedback at the input would do the opposite.



                You're far batter off getting a dedicated MPPT controller.






                share|improve this answer









                $endgroup$












                • $begingroup$
                  Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                  $endgroup$
                  – MDuarte
                  Mar 5 at 22:04















                7












                $begingroup$

                Although MPPT trackers are based around typically a buck converter, there's additional actions from a control loop, in hardware or programming, that actively tracks the point where maximum power is being drawn from the cell - this varies a little with solar intensity, so you might find a fixed voltage that is good enough for most conditions, but it also varies a lot with cell temperature, so the controller does need to be able to compensate.



                Since the solar intensity and cell temperature can vary, an MPPT tracker constantly adjusts the set point up and down, and compares the power generated, and aims to settle at the peak.To be able to vary the input, the controller changes the duty cycle of the buck converter, but obviously this assumes that the load (the battery pack) is capable of taking the full output, and once the battery reaches full charge the controller needs to limit the output voltage too, and the power available at the solar cell goes unused. Regulating only the input voltage would risk overcharging.



                Increasing the duty cycle increases the load and decreases the voltage at the solar cell, and a simple regulator wired with the feedback at the input would do the opposite.



                You're far batter off getting a dedicated MPPT controller.






                share|improve this answer









                $endgroup$












                • $begingroup$
                  Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                  $endgroup$
                  – MDuarte
                  Mar 5 at 22:04













                7












                7








                7





                $begingroup$

                Although MPPT trackers are based around typically a buck converter, there's additional actions from a control loop, in hardware or programming, that actively tracks the point where maximum power is being drawn from the cell - this varies a little with solar intensity, so you might find a fixed voltage that is good enough for most conditions, but it also varies a lot with cell temperature, so the controller does need to be able to compensate.



                Since the solar intensity and cell temperature can vary, an MPPT tracker constantly adjusts the set point up and down, and compares the power generated, and aims to settle at the peak.To be able to vary the input, the controller changes the duty cycle of the buck converter, but obviously this assumes that the load (the battery pack) is capable of taking the full output, and once the battery reaches full charge the controller needs to limit the output voltage too, and the power available at the solar cell goes unused. Regulating only the input voltage would risk overcharging.



                Increasing the duty cycle increases the load and decreases the voltage at the solar cell, and a simple regulator wired with the feedback at the input would do the opposite.



                You're far batter off getting a dedicated MPPT controller.






                share|improve this answer









                $endgroup$



                Although MPPT trackers are based around typically a buck converter, there's additional actions from a control loop, in hardware or programming, that actively tracks the point where maximum power is being drawn from the cell - this varies a little with solar intensity, so you might find a fixed voltage that is good enough for most conditions, but it also varies a lot with cell temperature, so the controller does need to be able to compensate.



                Since the solar intensity and cell temperature can vary, an MPPT tracker constantly adjusts the set point up and down, and compares the power generated, and aims to settle at the peak.To be able to vary the input, the controller changes the duty cycle of the buck converter, but obviously this assumes that the load (the battery pack) is capable of taking the full output, and once the battery reaches full charge the controller needs to limit the output voltage too, and the power available at the solar cell goes unused. Regulating only the input voltage would risk overcharging.



                Increasing the duty cycle increases the load and decreases the voltage at the solar cell, and a simple regulator wired with the feedback at the input would do the opposite.



                You're far batter off getting a dedicated MPPT controller.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Mar 5 at 16:34









                Phil GPhil G

                2,8571412




                2,8571412











                • $begingroup$
                  Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                  $endgroup$
                  – MDuarte
                  Mar 5 at 22:04
















                • $begingroup$
                  Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                  $endgroup$
                  – MDuarte
                  Mar 5 at 22:04















                $begingroup$
                Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                $endgroup$
                – MDuarte
                Mar 5 at 22:04




                $begingroup$
                Thank you very much for replying Phil. I know that nowadays load controllers with MPPT exist. What i have at the moment is an adjustable buck converter, and if i could build something like an aproximation of a tracker, maybe the next step should be, if i'm not wrong, something called "load controller". So, why not cheating the feedback loop trying to get an aproximate maximium power?. (I know that my solar panel is rounding Vmppt=18V)
                $endgroup$
                – MDuarte
                Mar 5 at 22:04













                4












                $begingroup$

                I doubt that would work, the output will start to oscillate trying to compensate the error.



                If you want to do MPPT on your solar panel, perhaps the easier way is to use devices that are made for that.



                One way of doing so is to use a buck topology to which the switching is controlled by a MCU and to write some simple MPPT algo.






                share|improve this answer









                $endgroup$

















                  4












                  $begingroup$

                  I doubt that would work, the output will start to oscillate trying to compensate the error.



                  If you want to do MPPT on your solar panel, perhaps the easier way is to use devices that are made for that.



                  One way of doing so is to use a buck topology to which the switching is controlled by a MCU and to write some simple MPPT algo.






                  share|improve this answer









                  $endgroup$















                    4












                    4








                    4





                    $begingroup$

                    I doubt that would work, the output will start to oscillate trying to compensate the error.



                    If you want to do MPPT on your solar panel, perhaps the easier way is to use devices that are made for that.



                    One way of doing so is to use a buck topology to which the switching is controlled by a MCU and to write some simple MPPT algo.






                    share|improve this answer









                    $endgroup$



                    I doubt that would work, the output will start to oscillate trying to compensate the error.



                    If you want to do MPPT on your solar panel, perhaps the easier way is to use devices that are made for that.



                    One way of doing so is to use a buck topology to which the switching is controlled by a MCU and to write some simple MPPT algo.







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Mar 5 at 12:49









                    DamienDamien

                    2,7131416




                    2,7131416





















                        2












                        $begingroup$

                        The MPP is not a fixed point but is highly depending on the amount of light shining on the panel.
                        A MPP-Tracker is always checking the input power, slightly changing the point on the IU-curve and checking the resulting power again. By comparison of the power values the Tracker is able to determin, if the MPP is reached or if the point on the curve has to be shifted a bit.



                        This means, that you are not able do set a fixed value for your converter.






                        share|improve this answer









                        $endgroup$

















                          2












                          $begingroup$

                          The MPP is not a fixed point but is highly depending on the amount of light shining on the panel.
                          A MPP-Tracker is always checking the input power, slightly changing the point on the IU-curve and checking the resulting power again. By comparison of the power values the Tracker is able to determin, if the MPP is reached or if the point on the curve has to be shifted a bit.



                          This means, that you are not able do set a fixed value for your converter.






                          share|improve this answer









                          $endgroup$















                            2












                            2








                            2





                            $begingroup$

                            The MPP is not a fixed point but is highly depending on the amount of light shining on the panel.
                            A MPP-Tracker is always checking the input power, slightly changing the point on the IU-curve and checking the resulting power again. By comparison of the power values the Tracker is able to determin, if the MPP is reached or if the point on the curve has to be shifted a bit.



                            This means, that you are not able do set a fixed value for your converter.






                            share|improve this answer









                            $endgroup$



                            The MPP is not a fixed point but is highly depending on the amount of light shining on the panel.
                            A MPP-Tracker is always checking the input power, slightly changing the point on the IU-curve and checking the resulting power again. By comparison of the power values the Tracker is able to determin, if the MPP is reached or if the point on the curve has to be shifted a bit.



                            This means, that you are not able do set a fixed value for your converter.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Mar 5 at 12:50









                            jusacajusaca

                            928319




                            928319





















                                1












                                $begingroup$

                                If you put no load on a solar panel at all, the voltage is maximum but the current is zero. If you short out a solar panel, the current is maximum but the voltage is zero. The power is the product of the current and the voltage.



                                The point of MPP tracking is to figure out the amount of load on the solar panel that maximizes the power produced by the solar panel. Since different MPPs will result in different voltages produced by the solar panel, this requires some kind of voltage converter that can take whatever voltage the MPP happens to be and make it useful.



                                If, for example, you are using 12V batteries and a solar panel whose MPP tends to be around 26 volts, a buck converter will do. But you need something to adjust the load the converter places on the panel to find the MPP. MPP trackers typically have software that varies the converter parameters and measures the voltage across the panel and the current it is supplying to discover the configuration that maximizes the power delivered. That's what MPPT is.



                                This requires discovery as the light on the panel changes. Sometimes it is brighter, sometimes it is dimmer. This results in changes to the maximum power point that must be discovered by varying the load the converter places on the panel.



                                Without any device to actually do the MPP tracking, you will not track the MPP.






                                share|improve this answer









                                $endgroup$

















                                  1












                                  $begingroup$

                                  If you put no load on a solar panel at all, the voltage is maximum but the current is zero. If you short out a solar panel, the current is maximum but the voltage is zero. The power is the product of the current and the voltage.



                                  The point of MPP tracking is to figure out the amount of load on the solar panel that maximizes the power produced by the solar panel. Since different MPPs will result in different voltages produced by the solar panel, this requires some kind of voltage converter that can take whatever voltage the MPP happens to be and make it useful.



                                  If, for example, you are using 12V batteries and a solar panel whose MPP tends to be around 26 volts, a buck converter will do. But you need something to adjust the load the converter places on the panel to find the MPP. MPP trackers typically have software that varies the converter parameters and measures the voltage across the panel and the current it is supplying to discover the configuration that maximizes the power delivered. That's what MPPT is.



                                  This requires discovery as the light on the panel changes. Sometimes it is brighter, sometimes it is dimmer. This results in changes to the maximum power point that must be discovered by varying the load the converter places on the panel.



                                  Without any device to actually do the MPP tracking, you will not track the MPP.






                                  share|improve this answer









                                  $endgroup$















                                    1












                                    1








                                    1





                                    $begingroup$

                                    If you put no load on a solar panel at all, the voltage is maximum but the current is zero. If you short out a solar panel, the current is maximum but the voltage is zero. The power is the product of the current and the voltage.



                                    The point of MPP tracking is to figure out the amount of load on the solar panel that maximizes the power produced by the solar panel. Since different MPPs will result in different voltages produced by the solar panel, this requires some kind of voltage converter that can take whatever voltage the MPP happens to be and make it useful.



                                    If, for example, you are using 12V batteries and a solar panel whose MPP tends to be around 26 volts, a buck converter will do. But you need something to adjust the load the converter places on the panel to find the MPP. MPP trackers typically have software that varies the converter parameters and measures the voltage across the panel and the current it is supplying to discover the configuration that maximizes the power delivered. That's what MPPT is.



                                    This requires discovery as the light on the panel changes. Sometimes it is brighter, sometimes it is dimmer. This results in changes to the maximum power point that must be discovered by varying the load the converter places on the panel.



                                    Without any device to actually do the MPP tracking, you will not track the MPP.






                                    share|improve this answer









                                    $endgroup$



                                    If you put no load on a solar panel at all, the voltage is maximum but the current is zero. If you short out a solar panel, the current is maximum but the voltage is zero. The power is the product of the current and the voltage.



                                    The point of MPP tracking is to figure out the amount of load on the solar panel that maximizes the power produced by the solar panel. Since different MPPs will result in different voltages produced by the solar panel, this requires some kind of voltage converter that can take whatever voltage the MPP happens to be and make it useful.



                                    If, for example, you are using 12V batteries and a solar panel whose MPP tends to be around 26 volts, a buck converter will do. But you need something to adjust the load the converter places on the panel to find the MPP. MPP trackers typically have software that varies the converter parameters and measures the voltage across the panel and the current it is supplying to discover the configuration that maximizes the power delivered. That's what MPPT is.



                                    This requires discovery as the light on the panel changes. Sometimes it is brighter, sometimes it is dimmer. This results in changes to the maximum power point that must be discovered by varying the load the converter places on the panel.



                                    Without any device to actually do the MPP tracking, you will not track the MPP.







                                    share|improve this answer












                                    share|improve this answer



                                    share|improve this answer










                                    answered Mar 5 at 20:57









                                    David SchwartzDavid Schwartz

                                    76139




                                    76139



























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