How Does Photovoltaics (PV) Work?
When some materials are exposed to sunlight, they release small amounts of electricity. This is known as the photovoltaic effect. When describing solar cells, the photovoltaic effect is the conversion of sun energy into electricity by the cells.
This is how it works. Sunlight is composed of photons, or particles of solar energy. These photons contain various amounts of energy corresponding to the different wavelengths of the solar spectrum. When photons strike a PV cell, the energy of the photon is transferred to an electron in an atom of the cell, which is made of a semiconductor material.
With its newfound energy, the electron escapes from its normal position on the atom and becomes part of the current in an electrical circuit. When this happens, the electron creates a “hole.” Special electrical properties of the PV cell, specifically a built-in electric field, provide voltage that drives the current through an external load, such as a light bulb, a hairdryer or a television set.
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The difference between a Grid-Tie and A Battery Back-Up system is very simple. A Grid-Tied system creates the energy and puts it onto the grid or into the home limiting what you need to buy from your utility. A Battery Back-Up system will do this also but it also will allow you to store energy at you home or business to use in the case of a power loss. In areas where that can be a common occurrence, this may be the type of system for you. A battery back-up system does cost a little more because of the extra components involved but the piece of mind is worth the investment.
ENTEC offers a on site consultation to help you ensure your system will meet all of your demands wether a grid-tie or battery back-up system. Our in depth PV audit will ensure your system is no more then you need and no less than what you want.
Call ENTEC today to have a PV Audit done on your home or business!