PV Gap

Alfred Said:

where to find used solar panels?

We Answered:

Used solar panels can be effective, provided they are in good condition. Make sure to test them for effectiveness before paying though, so you don't get ripped off.

Try reading here: http://ezinearticles.com/?How-to-Buy-Pre…

Nancy Said:

How can you use Solar Panels, Wind Energies and Dams as a renewable recouurce?

We Answered:

Okay... this seems familiar...

Well then. Solar Panels harvest energy from the sun. Sometimes, panels are used to create electricity via photons from the Sun's rays. Other times, the panels are simply deflectors that are used to boil water in a tube where the sunlight is concentrated.

Pro: The Sun won't run out of energy (hopefully) so this is renewable.
Con: The Sun won't shine every day! When it rains, the system is unusable, or when its cloudy, and this process only works during the daytime.

Wind Energy: Wind farms "harvest" the power of the wind by using the wind to blow on propellers that are attached to a generator to create energy.

Pro: Wind energy won't hurt the environment. Its reusable.
Con: Wind won't blow all the time, and you must have a good, strong, steady wind for this to work, or even be profitable. The wind is very random, and constructing "wind farms" takes up lots of space and time and resources, and usually can't produce much energy.

Dams
Hehe, fun word. Dams are used to block rivers and use the force of the water in order to turn turbines, like the wind energy.

Pro: Dams are efficient sources of energy, and there are multiple rivers in the world where one could build such a dam. Also, dams generate decent quantities of electricity.
Con: Everyone thinks that dams are clean. Well they're wrong. Dams create resovoirs behind them, blocking the natural flow of water, and pretty much creating a big fat lake. This may seem good, but too much water may make the soil over hydrated. If this is the case, then the plants around the resovoir die out, releasing massive amounts of carbon dioxide into our atmosphere; the very thing that we tried to avoid by building such a dam. Also, dams block the natural flow of water from the river. While they provide decent energy, the fish and various aquarius life are stuck. For example, you may have heard many examples of salmon blocked from their feeding ground and mating ground all because of a dam that blocked their way. This creates a major imbalance in our ecosystem.

My knowledge is very limited, so try researching your topic.

Hope this helps :D