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  • danlb
    replied
    Originally posted by reggie_obe View Post

    No, the sun is not a point source.. The sun is the largest soft light source available. Light bounced back by the ground is being reflected back to the ground by the water droplets.in the clouds.
    Not exactly a point source, but with an angular diameter of 0.5 degrees it is close enough for the purpose of this discussion.

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  • JCByrd24
    replied
    Temperature was mentioned already and is accurate, colder is more efficient. The angle of your roof compared may also be ideal this time of year for the position of the sun. My roof is steep and I live in Maine, so a good day in April for me matches a good day in July, despite a much shorter day. You also may have just caught it at the right time. My system graphs the entire day, and the peak for any day is quite short based on the path of the sun. My system is 3.8kw and I've been hitting 3.5-3.6kw peak every day, but maybe for only 30 minutes. Yesterday I was above 3.0 for about 4 hours.
    Last edited by JCByrd24; 03-27-2020, 10:06 AM.

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  • JRouche
    replied
    Originally posted by JRouche View Post
    I should have posted pics of the sky. JR

    Click image for larger version

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    My Idea? A rebound affect with the clouds reflecting the Sun Photons off the Surface of the Earth and that does in fact account for the additive.

    Thanks . JR

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  • darryl
    replied
    Sometimes the air is actually cleaner than normal. That will allow more energy to come through rather than becoming absorbed in the atmosphere.

    I can see there being an effect with clouds also- if you have direct sun on the panel and the sky is blue, that will be different than direct sun and a white sky. Obviously this means the sun is shining through a hole in the clouds. There could be a magnifying effect, or it could be that the air between clouds is cleaner and dryer because the moisture has migrated into the clouds. In that case, the direct sunlight could be stronger.

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  • JRouche
    replied
    Originally posted by Baz View Post
    Also temperature if panels makes a difference. Do you have a cold wind?.
    Mid 60s yesterday and today. JR

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  • Baz
    replied
    Also temperature if panels makes a difference. Do you have a cold wind?.

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  • JRouche
    replied
    I should have posted pics of the sky I have from that day. Great ideas. Thanks.

    Oh. Today is clear with no clouds and its maxed out at 5700W.

    Also just noticed I made 56MW so far. JR

    Click image for larger version

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  • ed_h
    replied
    Two components to insolation--beam and diffuse. Beam is direct from sun, and diffuse is from any other direction. Clouds of course can enhance the diffuse component greatly. Without tracking panels, the beam component gets relatively weaker as the incidence angle gets more oblique, so the diffuse component gets more relevant.

    The more the panel orientation differs from optimal, the more important the diffuse component becomes.

    Ed

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  • J Tiers
    replied
    Some of the above, none of the above........

    On a plain sunny day, clear, the only source of significant light is the sun itself, directly, plus some small ampount from the blue sky. Not much from the sky, as you can see when a small cloud obscures the sun.

    If there are scattered clouds, puffy ones, and the sun is NOT obscured, then yes, the sun hitting those clouds will provide added light as it reflects off of them as "side scatter". Under the right conditions that will add input. Anything reflected twice, i.e. off the ground first and then off the clouds second, I would expect to be minimal.

    BUT, this will NOT be the first time that you ever had clouds like that, and yet you say it IS the first time you have had that sort of power output.

    So, I agree, you have good conditions AND you have less than the usual amount of smog etc. There is a good case to be made that this is the first low-smog day you have had when you also had reflective clouds for the "side-scatter".

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  • reggie_obe
    replied
    Originally posted by danlb View Post
    Yes, the clouds act as a diffuser with a reflective underside. The watts per meter goes up. Without clouds you have the sun as a point source.

    Dan
    No, the sun is not a point source.. The sun is the largest soft light source available. Light bounced back by the ground is being reflected back to the ground by the water droplets.in the clouds.

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  • JRouche
    replied
    Originally posted by PStechPaul View Post
    It does not make sense to me that the clouds could do anything other than attenuate the insolation. .
    Did you see the clouds. They were not moving much at all as can be seen by their shape.

    Lens Man!!! I think we showed it if Edison shows the same.

    And yes the edison meter is second by second.

    I think that theory, that I first heard from AK is it.... Bed time...


    JR



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  • PStechPaul
    replied
    It does not make sense to me that the clouds could do anything other than attenuate the insolation. The sun supplies a maximum of about 1000 watts per square meter under ideal conditions, and solar cells are about 20% efficient. What I think may be more likely is that the current shut down of non-essential businesses and the associated reduction in motor vehicle traffic and other activity may have cleared the atmosphere enough to account for the increase in power.

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  • Noitoen
    replied
    How about pollution smog being lower due to industry slow down?

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  • JRouche
    replied
    fresnel lenses anyone? I also liked fractal programs before they were cool. Oh? Was never cool? LOL. Yeah. I was doing fractal programing when it was fun.

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  • JRouche
    replied
    Originally posted by danlb View Post
    Yes, the clouds act as a diffuser with a reflective underside. The watts per meter goes up. Without clouds you have the sun as a point source.

    Dan
    Yes.. Splain it a lil further. The lens??? The underbelly.. JR

    Edit: Not Reflective Dan < The flip side. and you are correct. JR

    Last edited by JRouche; 03-26-2020, 03:49 AM.

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