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Tuesday, November 1, 2011

How Does Solar Power Work?

Original Article

how-does-solar-power-work
Solar Energy: Keeping it simple
The Earth constantly basks in the Sun and is absorbing enough energy to satisfy the world’s power needs many times over.
So how do we turn the Sun’s energy into electricity? Well, the light from the sun contains energy. These particles of energy are called ‘photons’. These photons are created deep in the Sun by the fusion of atoms, and once they reach the sun’s surface, they shoot out in all directions into space. They take about 8 minutes to reach us here on Earth. You can feel them as they warm you when you stand in the sunlight.
When sunlight hits an object, that energy generally turns into heat. However, when sunlight hits certain materials, the energy turns into a flow of electricity instead. It’s kind of like turning on a water hose – imagine that the water in the hose is the flow of electricity.


Crystals made out of silicon will produce an electrical current (like the water flow in a hose) when exposed to sunlight. What happens is, the electrons that are in the silicon begin to ‘move’ when struck by light (instead of just staying mostly in place). Since the electrons move, we can harness that flow and direct it to useful things such as being converted to the energy we use in our homes, or perhaps to charge a bank of batteries.
In slightly more detail, a silicon atom contains electrons spinning around it’s nucleus. In a silicon crystal (of many silicon atoms), the bonds between the silicon atoms are made of electrons that are shared between all of the atoms of the crystal itself. When the light gets absorbed, one of the electrons that is in one of the bonds gets ‘excited’ up to a higher energy level and can move around more freely than when it was bound. That electron can then move around the crystal freely, and we can get a current. This is multiplied many times over since the crystals are made up of many atoms.

The Silicon Atom

silicon-atom-in-a-solar-cell


The silicon atom has three shells (the three ellipses around the nucleus). As silicon atoms come close to one another they connect, latching onto the electrons in the outer shell of other atoms to form a silicon crystal.

Newer materials than silicon use smaller and cheaper crystals, such as copper-indium-gallium-selenide, that can be shaped into flexible films. One drawback though is this ‘thin-film’ solar technology is not as good as silicon at turning light into electricity.
Solar panels are made from these silicon semiconductor materials (and the newer thin-film materials). Solar panels come in a variety of sizes and electrical capabilities. This aids in the design of a wide variety of purposes and provides the flexibility to customize most any energy system.

Here is an example of a small solar panel

Instapark® 5W Mono-crystalline Solar Panel with 12V Solar Charge Controller
Here is an example of a large solar panel

Grape Solar CS-P-270-DJ 270 Watt Polycrystalline PV Solar Panel


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