From: muratlanne@gmail.com   
      
   "Vaughn"  wrote in message   
   news:l7tl6o$9ec$1@speranza.aioe.org...   
   > >   
   > Back the the thread:  There is lots of "fuzzy math" used in solar   
   > panel rating.  Some of the numbers are seemingly dreamed up in the   
   > marketing department.  At best, the ratings apply only under the   
   > specified IDEAL conditions, which are likely only when operated at   
   > MPPT, in full sunlight, with the panel perfectly aligned.  But   
   > probably not even then.   
   >   
   > For most real-world uses divide the advertised power in half, and   
   > you MIGHT be in the right ballpark.   
      
   The HF "`15W" panels are rated with a 17.5V load, and more sunlight   
   than I've ever seen. I measure 0.6A to 0.8A per panel into a 12V   
   battery. That is at best ~10W at 12.6V.   
   jsw   
      
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