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On a cloudy day, the UV rays will come through the clouds and still heat up the water in the panel of a solar hot water system. You don’t need the sunlight to heat the water. The water temperature may be about 20% less but still hot.

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Well thats simeple….
on a cloudy day as we know that cloud contains water droplets and sudden dust particles…
so when the UV rays come….
they
broke the water molecules into water and hydrogen…
i.e.
UV + H2O—– H2+ O2
so the UV rays loose its energy here only and too the dust particles don’t allow them to penetrate. and hence they do not reach the earth surface…..
well i deny with silent…….. as we know that H2O is a green house gas so it only lead to green house effect..
due to which our sorrounding tempreture rises……

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Clouds reflect light, that’s why they are white. More clouds, more energy reflected into space which is why satellites can see clouds. More energy reflected, less get through to reach the Earth. Cloud reflectivity depends a lot on water droplet size, the smaller the droplets, the higher the reflectivity hence the proposal of using sulfur dioxide to increase cloud reflectivity to slow down global warming.

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Yes, basically they block the sunshine. I have a solar pv system and my production is dramatically decreased when clouds are overhead.

Kansieo.com

i think your english is a little off. A better question might be

“how much do clouds decrease the amount of solar energy that reaches the earth?”

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very true DIPTESH….