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Solar Panels - Photovoltaic Panels
PV cells are made of silicon, similar to that used in computer "chips". While silicon itself is a very abundant mineral, the manufacture of solar cells (as with computer chips) has to be in a very clean environment. This causes production costs to be high.

A PV cell is constructed from two types of silicon, which when hit by solar energy, produce a voltage difference across them, and, if connected to an electrical circuit, a current will flow.
Photovoltaic cells or panels are only one way of generating electricity from solar energy. They are not the most efficient, but they are the most convenient to use on a small to medium scale.

A number of photovoltaic cells will be connected together in an "Module", and usually encapsulated in glass held a frame which can then be mounted as required. The cells in a module will be wired in series or parallel to produce a specified voltage. What may be referred to as a 12 volt panel may produce around 16 volts in full sun to charge a 12 volt battery.

In most cases, a number of panels (modules) will be connected together to form an "Array". Panels of a similar type may be connected in series to give a higher voltage (two 12 volt panels may be connected in series to produce 24 volts). Usually a number of panels will be connected in parallel to give an increased current.
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