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All of the above.
88 sunny 99 partly cloudy 177 cloudy
http://www.weathertoday.net/weatherfacts/ Columbus OH, Sunny days only, not partly sunny or partly cloudy. 110
I don't know for sure, but it seems to me that there are more sunny days than cloudy days. If I had to guess, it would probably be about 280 sunny days.
3/4, so there are about 270 cloudy days and 90 sunny days in a year.
no
Cloudy days are usually better in summer than bright, sunny days.
yes, only if its sunny because the energy for evaporation is the sun
A cloudy day may lead to thunderstorms. Since water conducts electricity, it is especially dangerous to be in water if lightning occurs. Another reason: Even though it is cloudy. UV rays that cause sunburn can get through. You still need to apply sunscreen to prevent sunburn on cloudy days.
As long as there is sunlight on the panels, the system will produce electricity. However, production will be less on cloudy days than on bright sunny days. Think of it in terms of visibility. There is still outdoor visibility on cloudy or rainy days, albeit less visibility. There is still production on cloudy days, albeit less production. Since there is no sunlight at night, there is no production at night.
For Cleveland, OH... About 66 days of sunshine. The remaining 299 days consist of 97 partly cloudy and 202 cloudy days. Yes, 202 cloudy days! We've gone 2 weeks straight (usually in the winter) without seeing so much as a spec of sunshine. Percentage-wise that breaks down to: 18% Sunny days 27% Partly Cloudy days 55% Cloudy days Keep in mind too that during December, January and February we only have 9 sunny days on average throughout the entire 3 month span. (9 sunny days vs. 68 cloudy days). That's only 3 days per month folks. Not good. Only 4 other major US cities have less sunshine than Cleveland (Seattle, Portland, Buffalo and Pittsburgh). Here are 2 links that this information came from: www.weathertoday.net/weatherf...loudy_desc.php lwf.ncdc.noaa.gov/oa/climate/.../ccd/cldy.html
Solar lights still receive some sun light on cloudy days. Many are able to store power from previous sunny days and continue working through a few cloudy days before needing more sun light to power them. http://www.livestrong.com/article/170281-do-solar-lights-charge-on-a-cloudy-day/