What happens to solar panels when it’s cloudy or raining?

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Photovoltaic panels can use direct or indirect sunlight to generate power, though they are most effective in direct sunlight. Solar panels will still work even when the light is reflected or partially blocked by clouds. Rain actually helps to keep your panels operating efficiently by washing away any dust or dirt.

Source: http://www.seia.org/about/solar-energy/solar-faq/what-happens-solar-panels-when-it%E2%80%99s-cloudy-or-raining