Dear Mr. EcoGeek,
I've heard that it takes more energy to produce photovoltaic cells than the cells will ever produce throughout their lifetime. Is there any truth to that, or are those naysayers just saying nay?
Those naysayers are just saying nay! But that doesn't mean there's not more to this story.
This myth was probably perpetuated by
studying solar panels created for NASA. If you need something
extremely efficient for use in outer-space, yes, then it doesn't
matter how much energy you use to create the express cialis delivery panel. But for use hear
on Earth, it's ridiculous for anyone to say that solar panels consume
more energy than they produce.
Of course, doing anything in this world takes energy. Whether it's building power lines or shipping oil from Saudi Arabia, it takes energy to make energy usable. In fact, there's a nifty number that puts all of this into perspective. It's called the â€œenergy balanceâ€, and it is, in short, the amount of energy you get out divided by the energy you put in.
So, for corn ethanol, for example, we get 1.3 units of robovero.com energy for every 1 unit we put in, so its energy balance is 1.3. Whereas for Brazilian sugar cane ethanol, we get 8 units of energy for every one we put in. As for gasoline, its energy balance is about 5.
So what does this have to do with solar? It is a bit incorrect to apply energy balance to next day tramadol solar panels, because they don't actually contain the energy, so it's not something that I've ever actually seen done. But I think it makes sense to fudge it a bit in light of your question.
Data from a study(pdf) from Energy Environment and it's cool herbal alternative to levitra Economics Inc. showed that the average solar panel gets five times more energy out than was originally put in. Roughly the same â€œenergy balanceâ€ as gasoline.
Still, no one is satisfied with that
Continue Reading >>
Thousands of scientists, engineers and business people are working, right now, to increase solar's energy balance, and many have done it substantially. The simplest and most common methods include making sure that the panels are always at a 90 degree angle to the sun, increasing the life of the panels, and decreasing the amount of photovoltaic (PV) material needed in the low cost levitra panels.
As PV material (usually polysilicon) is energy intensive to create, a lot of folks are trying to figure out how to use less of it. One common method is to use mirrors or lenses to concentrate the sunlight on a relatively small amount of polysilicon material. Additionally, a whole other branch of the solar industry is trying to make solar panels from less energy intensive materials, including the much touted copper indium gallium selenide (CIGS) thin-film solar panels.
There may be some economic reason to not be an early adopter of the best place cialis without prescription online solar, but there is http://www.beverly.org/generic-levitra-100mg certainly no doubt that they produce a lot more energy than they consume. And soon, they'll be producing even more.
written by Thursday, July 13, 2007
written by Johan Smit, July 13, 2007
written by Kristina, July 13, 2007
written by luma, January 15, 2008
written by batman, February 23, 2010
written by U Serman, January 10, 2012
|< Prev||Next >|