ESP Projects

How Solar Power Works

A Solar Cellpv_cell_works_400

Silicon absorbs photons from solar radiation


If photon energy is great enough, an electron from the outer electron shell is freed and this results in :

• A hole (lack of an electron)
• An Excess electron in crystal structure
Without a barrier, the excess electron would rapidly fill the hole so a barrier is introduced inhibiting the free migration of electrons resulting in what are called “n” layers and “p” layers. This results in
• a Buildup of electrons in the n-layer
• a Deficiency of electrons in the p-layer
By connecting n and p layers through an electrical circuit, DC current will flow.  a number of these silicon cells are then connected together (usually either 60 or 72) to form a solar panel.
Grid Connect Solar Power System