It is the layer of material found at the back of the panel that comes in contact with the mounting surface. The solar backsheet is primarily responsible for providing insulation and protecting the PV cells from moisture, UV light, and other external elements that could harm their.
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To achieve a 10kW solar system you are going to take 10,000 watts (10kW) and divide it by the wattage of a single solar panel (370 watts). This will give you a reading of 27.
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The operating temperature of the panel is one of the important parameters affecting the conversion efficiency.
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If you're asking this question, you've probably noticed that most modern high power solar modules are manufactured with wire leads that have latching connectors on the ends. These are usually referred to as MC4 connectors.
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