Wiring Unlimited is a great resource that covers many many common topics and questions relevant to DIYers. It is a free E-book from Victron Written by Margreet Leeftink. Check it out! Download
I'm going for cheap. I live in southern California. Lots of Sun ?. The panels are used, working, pulled out to upgrade to a higher power setup. My cost for the panels delivered to my backyard is $700.