1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

solar tracker

Discussion in 'Mathematics and Physics' started by PG1995, Dec 19, 2013.

  1. PG1995

    PG1995 Active Member

    Joined:
    Apr 18, 2011
    Messages:
    1,645
    Likes:
    13
    Thank you, NG.

    But I'm interested in some kind of graph/chart which shows the combined effect of the solar tracker and MPPT on the efficiency. I couldn't find it. Perhaps, you could use some better search phrase. Thanks.

    Regards
    PG
     
  2. NorthGuy

    NorthGuy Well-Known Member

    Joined:
    Sep 8, 2013
    Messages:
    1,218
    Likes:
    206
    Location:
    Northern Canada
    You can use formulae that I posted to create a graph in Excel.

    Then, if you build your own, you can collect empirical data and graph them along with a theoretical graphs.
     
  3. PG1995

    PG1995 Active Member

    Joined:
    Apr 18, 2011
    Messages:
    1,645
    Likes:
    13
    Thank you, NG.

    I will do it some other time. I don't know how to do it in Excel and at the moment really have limited time. Anyway, thanks.

    Regards
    PG
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. steveB

    steveB Well-Known Member Most Helpful Member

    Joined:
    Jan 16, 2009
    Messages:
    1,297
    Likes:
    629

    Pg, you can do plots in Matlab pretty easily. Note that business's people and engineers need to be able to generate plots/graphs given data and/or formulas. It is very rare to get plots in a form that is correct for what you are trying to do. But making them exactly as you need them is relatively easy. You spent two hours searching for something you could have made yourself in 15 minutes.
     
    • Like Like x 1
  6. PG1995

    PG1995 Active Member

    Joined:
    Apr 18, 2011
    Messages:
    1,645
    Likes:
    13
    Hi

    Do you think the the solar tracker shown in this video will work fine? The circuit diagram is given here? Thanks.

    Regards
    PG
     
  7. steveB

    steveB Well-Known Member Most Helpful Member

    Joined:
    Jan 16, 2009
    Messages:
    1,297
    Likes:
    629
    I can tell you what bothers me about this setup. It looks to me that the sensors are set to trip based on light level with comparitors. But, their description says that the system will turn to match the sensor light equally. Also it seems that the sensors will see equal illumination at any angle. There is no shader between the sensors and in the video they make it turn by illuminating one sensor. Perhaps I'm just being stupid and missing the point but it looks to me that the system will not work as needed.
     
  8. PG1995

    PG1995 Active Member

    Joined:
    Apr 18, 2011
    Messages:
    1,645
    Likes:
    13
    Thanks, Steve.

    I understand your point about the shader between the sensors. Perhaps we can do a little modification. And it's good you replied here so that others can also see where the problem lies.

    Regards
    PG
     
  9. NorthGuy

    NorthGuy Well-Known Member

    Joined:
    Sep 8, 2013
    Messages:
    1,218
    Likes:
    206
    Location:
    Northern Canada
    I agree with Steve. As one of the options, you can install the sensors on the side of the panel. This way the panel itself will work as a shader and nothing will cast a shade on the panel. If the panel has an aluminum frame (as most good panels do), it will be easy to mount sensors this way.

    Also, it is a horrible idea to put a tape accross the panel and on the edges. Even a small local shading of the panel will decrease panel production dramatically. Panel should be completely exposed and any shading avoided at any cost.

    The video looks more like a demonstration of the principle rather than a working product.
     
    • Like Like x 1
  10. PG1995

    PG1995 Active Member

    Joined:
    Apr 18, 2011
    Messages:
    1,645
    Likes:
    13
    Thank you.

    I'm finding it hard to mentally picture the configuration you are talking about. How a panel can work as a shader.

    Besides the shader issue, do you find the setup correct? Do you think it will do as a school project? steveB told me that as it is shown the tracker has fast response time and in his opinion it should have slow response time. But I have seen some videos where the trackers are not just fast rather super fast. Thanks.

    Regards
    PG
     
  11. NorthGuy

    NorthGuy Well-Known Member

    Joined:
    Sep 8, 2013
    Messages:
    1,218
    Likes:
    206
    Location:
    Northern Canada
    Typical panel frame looks like this. Imagine a sensor mounted on the side of the frame. The sensor will see the light to the right of the panel, but the panel will block all the light from the left side to the sensor.

    I think this is better determined by experimentation. From the pure light viewpoint, when cloud cover changes rapidly, you want tracking to be fast to reflect all changes quickly. However, what you gain in panel production could be less than what you spend on the rotation. Therefore, it's worth rotating only when difference between sensors is relatively high. This should produce very slow motion following the sun most of the time, but if there's a sudden change, it might be a good idea to react fast.
     
    • Like Like x 1

Share This Page