<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>Thanks Peter, I was trying to figure out how to translate from lumens, good job<br>Darryl<br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size: 13px;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Peter Parrish <peter.parrish@calsolareng.com><br><b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b><span style="font-weight: bold;">Sent:</span></b> Thu, February 3, 2011 5:40:44 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Low light panel<br></font><br>
This is a pretty good example of how obscure the various "lighting"<br>variables are for even solar pros. <br><br>I won't go into the gory details (and they are details of some depth, trust<br>me). So let's take the following shortcut.<br><br>A decent CFL puts out 60 lumens per watt of power consumed. So, in theory,<br>one could get 60 lumens from a tiny CFL drawing 1 watt of electrical power.<br><br>One watt of electrical power going into the CFL and 60 lumens out.<br><br>If you illuminated the PV module with those 60 lumens and it produced 0.7 A<br>@ 14 volts, that would be 20 watts of electricity.<br><br>Lo and behold! You got 20 Watts out from 1 Watt in.<br><br>You have just violated the "conservation of energy" by a factor of 20X.<br><br>- Peter<br><br><br><br> <br>Peter
T. Parrish, Ph.D., President<br>California Solar Engineering, Inc.<br>820 Cynthia Ave., Los Angeles, CA 90065<br>CA Lic. 854779, NABCEP Cert. 031806-26<br><a ymailto="mailto:peter.parrish@calsolareng.com" href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a> <br>Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br><br> <br>-----Original Message-----<br>From: <a ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a><br>[mailto:<a ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] On Behalf Of Carl Adams<br>Sent: Thursday, February 03, 2011 1:19 PM<br>To: <a ymailto="mailto:RE-wrenches@lists.re-wrenches.org" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br>Subject:
[RE-wrenches] Low light panel<br><br>Hello Wrenches,<br><br>I'm looking for a panel which will provide<br>0.7A at 12-20V<br>with only a 60 lumen light source for the irradiance source<br><br>With REgards<br>Carl Adams<br>SunRock Solar LLC<br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a ymailto="mailto:RE-wrenches@lists.re-wrenches.org" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><span><a target="_blank" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br><br>List-Archive:<br><span><a target="_blank" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><br>List rules & etiquette:<br><a
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