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"On cost per watt, we're cheaper than PV (photovoltaics)," said CEO Darren Kimura. "But that's not what really matters. We can do more production. We actually get more sun energy every day."
With a higher output, the payback on an initial investment comes quicker, he argued. The troughs can be used by corporate customers as well for on-site power generation.
How much time before payback?
One Solar Panel maker reported a one year payback interval.
http://www.thedailygreen.com/green-homes/eco-friendly/evergreen-solar-panels-460608
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According to Evergreen, the carbon footprint of these new panels is up to 50% smaller than those of competitors, and they have a quicker energy payback -- reportedly as fast as 12 months for installed panels. This last point is particularly exciting, since the amount of energy required to make solar panels has long been a bone of contention among critics of the technology.
Back in the late 90s, energy paybacks for solar panels were as high as seven years. Today, they are often reported as "1-5 years."
http://www.evergreensolar.com/app/en/home/
There’s never been a better choice for solar panels than Evergreen Solar. Our panels are made by state of the art manufacturing featuring our unique String Ribbon wafer technology. Add the fact that we manufacture everything — wafers, cells and panels — all under one roof for ultimate quality control, and it’s not surprising then that our solar panels are among the highest quality products in the industry. And that’s not all. Because of the unique way they’re made, they are the most environmentally friendly solar panels in the business.