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Old 10-27-2008, 02:51 PM   #16
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How to Read Labels on Electrical Products


Sunlight puts out 60w/sq. ft and solar panels are 7% efficient so they give 4w/sq.ft., so for 1kw you'd need 1000/4 = 250 sq. ft. of solar panels (that track the sun as it moves).
If you use parabolic mirrors heating pipes to supply hot water you get close to 100% efficiency.

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Old 10-27-2008, 03:24 PM   #17
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How to Read Labels on Electrical Products


quite sure I read recently that solar panels are becoming more and more efficient. They are currently about 12% with the top ones at about 15%. An 18% effecient unit is expected to be available soon.
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Old 10-27-2008, 04:17 PM   #18
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How to Read Labels on Electrical Products


There's a lot of "press release products" when it comes to solar, especially with oil the way it was. Don't believe it until the "add to cart" link is live.
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Old 10-27-2008, 05:10 PM   #19
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How to Read Labels on Electrical Products


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Originally Posted by joey b View Post
quite sure I read recently that solar panels are becoming more and more efficient. They are currently about 12% with the top ones at about 15%. An 18% effecient unit is expected to be available soon.
Apparently it's 130 w/sq ft if you include visible, ultraviolet and infrared light from the sun. I don't know how much of these wavelengths a solar panel picks up so I guess 130 is a max.

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