solar panels
DESCRIPTION
This document explains the working principle of solar panelTRANSCRIPT
Solar Panels and How They Work
First… A Brief Introduction
About The Sun
Generates it’s energy through nuclear fusion
Needed to make the earth function:
-Photosynthesis for plants
-Provides solar energy
-Evaporation > Rain
-MUCH MORE
The Sun & The Earth
The Sun’s Rays Enter the Earth’s Atmosphere
The Atmosphere
Solar radiation first hits the atmosphere in this layer and ionizes air molecules. A region of ionized particles in the thermosphere is called the ionosphere. Auroras, which are interactions of charged solar particles and the ionosphere, can be seen in this layer of the atmosphere. Temperature is up due to ionization of air molecules by solar radiation. Air is extremely thin.
Auroras in the Thermosphere
An aurora is an interaction of the ionosphere and charged solar particles within the thermosphere.
Aurora – The Northern Lights
The Atmosphere
Troposphere (where we are) has high temperatures due to molecules absorbing the Sun’s energy.
The Sun’s EnergyWe can tell the Sun’s
energy is present…
The radiation/energy off of the sun heats up pavement, causing you to
see “heat waves”. “Heat waves” look like water almost, causing
mirages in the desert. For example, if you saw that watery look ahead in the desert, you would think there is water ahead, when it is really only
hot sand
The Sun’s EnergyWe can tell the Sun’s
energy is present…Radiation/energy from the sun can also heat swimming pools.
What is Solar Energy?
• Originates with the thermonuclear fusion reactions occurring in the sun.
• Represents the entire electromagnetic radiation (visible light, infrared, ultraviolet, x-rays, and radio waves).
How much solar energy?
The surface receives about 47% of the total solar energy that reaches the Earth. Only this amount is usable.
The Sun’s energy is out there, but how can we convert it into electrical
power?
What is the missing link to take the sun’s energy and convert it into electrical energy?
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Solar Panels
Solar Panels can do just that!
How Solar Panels WorkThe basic element
of solar panels is the same element that helped create the computer revolution --pure silicon.
Direct Conversion into Electricity• Photovoltaic cells are
capable of directly converting sunlight into electricity.
• A simple wafer of silicon with wires attached to the layers. Current is produced based on types of silicon (n-and p-types) used for the layers. Each cell=0.5 volts.
• Battery needed as storage• No moving partsdo no
wear out, but because they are exposed to the weather, their lifespan is about 20 years.
How Solar Panels Work
When silicon is stripped of all impurities, it makes a ideal neutral platform for the transmission of electrons. Silicon
also has some atomic-level properties which make it even more attractive for the creation of solar panels.
Silicon atoms have room for eight electrons in their outer bands, but only carry four in their natural state. This
means there is room for four more electrons.
How Solar Panels Work
If one silicon atom contacts another silicon atom, each receives the other atom's four electrons. This creates a strong bond, but there is no positive or negative charge because the eight electrons satisfy the atoms' needs.
Silicon atoms can combine for years to result in a large piece of pure silicon. This material is used to form the
plates of solar panels.
How Solar Panels Work
Here's where science enters the picture. Two plates of pure silicon would not generate electricity in solar panels, because they have no positive or negative charge. Solar panels are created by combining
silicon with other elements that do have positive or negative charges. Phosphorus, for example, has five electrons to offer to
other atoms. If silicon and phosphorus are combined chemically, the result is a stable eight electrons with an additional free electron
along for the ride. It can't leave, because it is bonded to the other phosphorus atoms, but it isn't needed by the silicon. Therefore, this
new silicon/phosphorus plate is considered to be negatively charged.
How Solar Panels Work
In order for electricity to flow, a positive charge must also be created. This is achieved in solar panels by
combining silicon with an element such as boron, which only has three electrons to offer. A silicon/boron plate still has one spot left for another electron. This means
the plate has a positive charge. The two plates are sandwiched together in solar panels, with conductive
wires running between them.
How Solar Panels Work
With the two plates in place, it's now time to bring in the 'solar' aspect of solar panels. Natural sunlight sends out
many different particles of energy, but the one we're most interested in is called a photon. A photon
essentially acts like a moving hammer. When the negative plates of solar cells are pointed at a proper
angle to the sun, photons bombard the silicon/phosphorus atoms.
How Solar Panels Work
Eventually, the 9th electron, which wants to be free anyway, is knocked off the outer ring. This electron doesn't remain free for long, since the positive silicon/boron plate
draws it into the open spot on its own outer band.
How Solar Panels Work
As the sun's photons break off more electrons, electricity is generated.
Solar Power PlantsSolar Power Plants have massive
amounts of solar panels to power their city. Rizhao City, in China is converting to solar energy. There is construction going on to build a solar power plant in Nevada, that will meet the needs of about 40,000 households with solar energy.
Sun goes down, Lights go out???
Many people think that when the sun goes down, or we have a cloudy day, no energy would be produced, leaving us in the dark. That theory is not true. In fact, even with clouds, some rays from the sun still get through, just not as many on a clear day. Also, when the solar panels collect energy during the day, not all of it is used. What isn’t used is stored in giant batteries at the plant so there is always a reserve. However, it would be quite a test in Alaska, because the reserve may not hold out for three months!
Batteries to hold Solar Power
These batteries are small batteries to hold solar power
Batteries to hold Solar Power
These are heavy-duty batteries that could be used at a solar power plant to hold some of the reserve power.
Could your house “go green”?
Yes, it is possible. Houses have already gone to solar power. They put solar panels on their roof to collect sunlight and have batteries in their basement to store the reserve power. Some have even put up solar panels in their yards.
Solar Powered House
Disney World & The Environment
Disney World in Orlando
Florida has gone green. They provide
their own power, they
treat their own sewage... All in all, they’re self
sufficient.
Want to try some Solar Power?You do not need tens of thousands of solar panels just to
power something. You can power small electronics with a small solar panel you can use!
10 Watt - http://www.ccrane.com/more-categories/alternative-power/10-watt-solar-panel.aspx
2.5 Watt - http://www.ccrane.com/more-categories/alternative-power/2-watt-solar-panel.aspx
Want to try some Solar Power?
Solar Powered Lights
Just “Google” Solar Lights!!!
Solar Powered Spot Light
Solar Powered Spot Light
Solar Panel