Direct sunlight means that the sun’s light is directly hitting the solar panel. For example, if you were standing outside under the sun with nothing obstructing you and the sun, then you would be in direct sunlight. If you were standing inside, you would be getting indirect sunlight but no direct rays from the sun. Solar panels always need direct sunlight to charge. If in doubt, think of it this way; if you were the solar panel and you were able to directly see the sun, then you would be in direct sunlight!
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