The working principle of solar light is easy and simple. Solar cells that are responsible for converting the sunlight’s radiation into electricity. The electric energy is stored in the batteries then. If the illumination decreases to for example 100lux, the circuit controller will send signal to the battery to power on the Leds. Moreover, the charge and discharge circuit controller is also known for protecting the battery. For optimal performance, please put the solar light in a position it can get direct sunlight. Direct sunlight is very important! More hours charging during the day, more hours working in the night! It's also convenient to maintain the performance of solar light. Use soft fabric with water to clear the solar panel periodically, make sure the solar panel is not blocked by trees, shadow, snow etc. it will work well for a long time. www.aubenar.com