From: vaughnsimon@gmail.invalid   
      
   "danny burstein"  wrote in message   
   news:jen24b$9r9$1@reader1.panix.com...   
   > Assuming they're telling the truth and this panel would   
   > provide 50 watts in direct sun, that would (rule of thumb)   
   > get us about 200 watt-hours on sunny days, and maybe   
   > a quarter of that on a typical foggy/misty one.   
      
   In the real-world, expect about half of the advertised panel output.  Why?    
   That   
   "50 watts" only happens with a perfectly matched load, in full sunlight, and   
   with the panel tracking a perfectly full sun.  You won't have a sun tracker   
   (derate) and at that price-point you won't have an MPPT charge controller   
   (derate).  Also, your battery only gives back about 80% of what you put into it   
   (derate).   
      
   Still, from my own experience, I think that panel will likely do the job you   
   describe.   
      
   Vaughn   
      
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