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Solar cells are at the heart of your photovoltaic system. They convert sunlight into electrical energy and are therefore the most important component of your system. There are different types of solar cells, including monocrystalline, polycrystalline and thin-film solar cells. Each type has its own advantages and disadvantages, but whichever type of cell you choose, it's important to understand how they work and how they contribute to the efficiency and output of your PV system. The more efficient the cells, the more energy can be generated from the sun and the more money can be saved in the long term.