How a Solar Panel Works

Building a solar power house has been a dream in the environmental sector for quite some time, and there are tons of approaches to achieve it, though they are not quite there yet. The two most usual approaches to create a solar efficient or solar power house are generally by means of solar thermal systems and solar power kits, that make use of photovoltaic systems to convert the sun's rays into electricity. We will discuss photovoltaic systems as a part of solar power kits right now and go over solar thermal some other time.

Solar power kits sell pre-packaged units of individual solar power cells which are wired into arrays to provide useful voltage and current levels, usually they're panels with 36 cells apiece for reasons of voltage and current draw. Even so, there is more to just how those solar power cells function that makes for interesting reading.

Semiconductors And Photons

Solar power cells (just like those found in solar power kits) are usually made from silicon wafers. These are made so that when sun rays hits a single portion of the particular cell, it shakes electrons loose which then migrate to another portion of the cell; this creates a current and is how a solar power cell produces electricity. Because silicon is a semiconductor (this means that it can have electrical energy go in one particular path through it), this permits sunlight to move into the solar power cell and electricity to come out the other side. This electrical energy is a function of the differential between two variations of crystalline silicon.

A silicon atom carries fourteen electrons arranged in 3 shells of potential. The outer shell is half full, having 4 of 8 electrons filled. Due to this fact, the silicon atom has, for deficiencies in a better term, sockets for additional electrons to fill up; whenever in crystalline form, it'll share electrons with the four nearest silicon atoms to it. In its pure form, crystalline silicon is really a poor conductor of electricity, because none of those electrons are free to move around. (Electrical conductivity is a function of electrons moving from one atom to another.)

To use silicon as a semiconductor (needed to be used in a solar power kit), you dope it along with other elements, called impurities. These kinds of doped compounds will bond with silicon atoms in a lattice and give it a way to transmit electrical current; being a bit more specific, the doped compounds allow for electrons to be shaken loose a little bit more easily. This means that when energy comes in the silicon, it more effortlessly shakes electrons use. For type N (or negative valence silicon), the doping is done with phosphorous (that has 5 electrons in its external shell), which of course means the silicon is likelier to shake an electron loose, making a negative potential. For type P (or positive valence silicon), the silicon is doped with boron, that has three electrons in its outer shell, so that it is likelier that there will probably be a space in the electron shells for an electron to fit in. N type silicon is a very good conductor, while P type silicon is a great resistor.

A solar power cell includes a layer of N type silicon over a layer of P type silicon; the N type silicon will get hit by solar photons, which shake electrons loose; when the photons are energetic enough, the electrons will be discharged with adequate energy to cross over from the N type silicon to the P type silicon and in turn this produces a current. That current is then run through an inverter and trapped in batteries for the solar power home.

A solar power cell includes a layer of N type silicon over a layer of P type silicon; the N type silicon will get hit by solar photons, which shake electrons free; when the photons are energetic enough, the electrons will be discharged with adequate energy to cross over from the N type silicon to the P type silicon and this generates a current. That current is then run through an inverter and kept in batteries for the solar power home.

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Cheap Solar Panels gives you an overview on how to make your own solar power home at a very low cost.

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