<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt">>The problem is not just the cost of the lenses. In order to get the
same output as a 20 meter^2 PV panel array, you need 20 meter^2 of
Fresnel lenses; and some means of holding it very steady in the
wind, a precise distance away from the collector; plus be able to
move the whole unit (including the cooling system), very precisely
throughout the day, every day.<br><br><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;">The fresnel lenses are fairly small and only a few inches away from the cell. No need to hold it steady in the wind.<br><br>An example: http://energy.gov/articles/keeping-america-competitive-solar-manufacturing-boost-san-diego<br><br>Here's an interesting link: http://www.greenrhinoenergy.com/solar/technologies/pv_concentration.php<br><br>~sanjay<br> </div> </div> </div></body></html>