From: bwegher@hotmail.com   
      
   "(PeteCresswell)"  wrote in message   
   news:ta11i757vemlr1jiiah6dg7gt1dspm43gh@4ax.com...   
   > I'm looking in to putting an IP camera on an outbuilding and   
   > maybe one of those flood lights that is triggered by motion.   
   nencumbered by any knowledge or expertise, I am led to thinking   
   > maybe this could be a solar application:  automobile battery and   
   > el-cheapo inverter in the shed, collector panel on the roof, some   
   > sort of box to facilitate panel's charging the battery...   
   >   
   > Is the scale/complexity of something like this small enough so it   
   > would compete favorably with a couple thou to hire an electrician   
   > to run 120v to the outbuilding?   
   > --   
   > Pete Cresswell   
      
   A 10 watt load times 24 hours a day is 240 watt-hours per day. Average   
   insolation on a 100 watt peak solar photovoltaic panel (about 1 square   
   meter) will produce around 400 watt-hours a day on average over the year,   
   but much less in December-January. If you are in the SW then you will get   
   more than 400 watt-hours a day, but if you are north of 40 degrees, or in   
   the northeast then you will need more area.   
   You will lose at least 25 percent charging the battery. Never use a cheap   
   automotive battery. A marine trolling battery will work for a few years, but   
   try to find a couple golf-cart batteries.   
   http://www.fsec.ucf.edu/en/publications/pdf/FSEC-RR-54-98.pdf   
      
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