Solar lights that can generate electricity on cloudy days
Yes, solar lights can work on cloudy days, although their performance drops with less sunlight. Built-in sensors often adjust brightness. [PDF Version]
How to generate electricity with solar energy on cloudy days
Yes — solar panels work on cloudy days. They produce 10–70 % of their rated output depending on cloud thickness, because they use diffuse (scattered) light, not just direct sunbeams. [PDF Version]
Solar power generation has charging function on cloudy days
In short, a solar generator lets you store the extra power generated and use it during cloudy days or even nights when there is no sunlight. [PDF Version]