Have you wondered how they make solar panels? This video gives us a rough idea. First, photovoltaic cells made of silicone with conducting grooves across their surfaces get wires carefully soldered on to them. Each cell then gets a bath, cleaned using sound waves in warm water. Then, the cells are soldered together into a strip of nine. Each strip needs to be handled gently— they have a special suction cup device to lift it without causing damage or getting anything dirty. The strips are tested to make sure that the voltage is correct and no soldering needs to be repaired or redone. Then, the strips are assembled into groups of four and placed onto a sheet of layered glass— transparent enough that sunlight can get through to the solar cells, and rigid enough to prevent damage to the cells and make the panels easy to mount and to maneuver. The photovoltaic cells are anchored to the glass using a thin layer of laminate, and the whole thing is cooked in an airtight oven for fifteen minutes. The final test comes after the sheet has been cooked. It is placed under a sunlight-simulating lamp, to make sure it produces the voltage it's supposed to. The whole process takes about an hour, start to finish.