don't bother with solar panels 4 7950s use between 900 and 1200w depending on the brand of the cards ( i use 950w at the wall maximum )
if you give me a list of questions i will do my best to ancer them

Are you kidding? Skip the computer, just buy the panels.
The return is much better. Guaranteed 400%-500% return on investment over 30 years.
How much will a rig make?