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Ok, ill try again

Discussion in 'Photovoltaics' started by Average Shmo, Feb 11, 2006.

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  1. Average Shmo

    Average Shmo Guest

    Thanks to everyone who replied to my post about using mirrors to concentrate
    more light onto a solar panel. Although the outcome seemed to be that it
    would be a waist of time, Im thinking there way be a way to get more bang
    for the buck.

    Ive still got a spare solar panel and i want to get more power output from
    it. What about relfecting certain parts of the spectrum so that the solar
    panel doesnt heat up (as much) and gives an increase in power output?

    Thanks again :)
  2. SJC

    SJC Guest

    You could research what are called "cold mirrors" online.
    These are mirrors that reflect shorter wave lengths but not longer ones.
    They are not that selective, so shorter wave lengths of light that you
    can convert into electricity will pass through to some degree.
  3. SJC

    SJC Guest

    OTOH you may find that cold mirrors are costly and too non-selective
    to be very efficient. So, I would go for thermally conductive reflectors
    that can sink the heat out to them like fins. They have lots of surface
    area and are in the wind. BTW the wind will be a big factor as well.
  4. SJC

    SJC Guest

    Another point to consider is shadowing. If you have a four sided
    "picture frame" type of refector configuration on a rectangular panel,
    at some sun angles the reflector will shadow part or all of the panel.
    This would expose some of the cells to intense light and others to
    just ambient light, or shadow. You would probably want to consider
    what happens to the panel when 1/2 of the cells get close to 2x illumination
    and the other 1/2 gets shadow.
    When I experimented with my thin film panel, I made sure the panel was
    aimed at the sun, such that there was no shadowing.
  5. SJC

    SJC Guest

    It is a good thought. If you want more concentrator gain it might
    be a good idea to use a tracker. Think of a 4 panel Wattsun tracker.
    Instead you put two panels with 2x reflectors and do 2 axis tracking.
    No shadowing and peak output. But the tracker might have a heck
    of a time in any significant wind do to the extra drag from the reflectors.
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