In that way, the solar light is always either charging or illuminating. The photoresistor’s job is then to detect when light is no longer hitting the solar panel, at which point two things will happen: 1) the battery will stop getting charged, and 2) the controller board will tell the light to turn on. During the sunny daytime hours, the four-cell solar panel will charge up the battery, typically receiving more than enough juice to run for the entire night. The rest of the solar light comprises a battery, controller board, photoresistor and the light itself. The typical solar light will therefore use just four solar cells, but that’s really the only difference from a solar technology basis. While standard types of solar panels may contain 36 to 48 solar cells connected together, solar lights are smaller in size and require much less electricity to run (particularly when paired with energy-efficient LED lights).
When sunlight strikes the cell, some of that energy is absorbed by the material via electrons being knocked loose and being able to flow freely (otherwise known as electricity!). Regardless of the size of a solar panel, it contains solar cells, which are made up of unique semiconductor materials like silicon. What’s particularly intriguing about solar lights is that the technology used is more or less the same as these large-scale panels that are powering entire buildings. You may have seen traditional solar panel installations on the rooftops of homes around you, businesses at which you shop or even installed in large outdoor solar farms owned by utilities. When choosing the best outdoor solar lights for your yard, it may be helpful to understand how these solar panels work.
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