A reasonable value to assume for the efficiency of a common solar cell that is used in typical pv installations on homes and businesses is 0.50 to 0.55.
Solar Photovoltaic Cell Basics
A photovoltaic (PV) cell, also known as a solar cell, can either reflect, absorb, or pass through light that strikes it. The semiconductor material that makes up the PV cell can conduct electricity more effectively than an insulator but not as effectively as a good conductor like a metal. In PV cells, a variety of semiconductor materials are employed.
When a semiconductor is exposed to light, the light's energy is absorbed and transferred to the semiconductor's negatively charged electrons. The additional energy enables the electrons to conduct an electrical current through the material.
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