Eric,
Solar powered computers... possible if you have a battery system being
charged by the solar cells.  It would be very expensive, though...
probably cost more than running wiring.  As for having computers
outdoors... the heat and humidity would kill them (cold as well).  You
would need computers designed for this type of duty... not the type you
pick up at the local computer store.  This would also be costly.  There
would other problems to overcome as well, depending on your location.
What do you hope to accomplish - what information to you wish to convey.
There may be an alternative.
 
Mark C. Vang
Exhibit Technician
 
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