Reddit mentions of Photovoltaics: Design and Installation Manual

I stepped out of the solar industry a few years ago, but at the time the best beginner's book was Photovoltaics: Design and Installation Manual. Be aware that if you go grid-tied, the National Electrical Code is constantly being updated, and you should stay up-to-date so your system is safe and code-compliant. Off-grid, you should also follow best practices, but the NEC has less to say about such systems. You might want to go grid-tied anyway (if your utility allows), because batteries are less efficient, expensive, and can be finicky beasts at times.

If you want to take a course, online or elsewise, check out Solar Energy International.

A super resource, and one that I can't recommend enough, for all renewable energy DIY things has always been Home Power Magazine.

All in all, it's not too difficult to design and install your own PV system! Good luck!

This book can walk you through the process of installing small PV systems start to finish. It is very easy to read and was a great help while I was studying to get my NABCEP cert.

http://www.amazon.com/Photovoltaics-Installation-Solar-Energy-International/dp/0865715203

Photovoltaics: Design and Installation Manual https://www.amazon.com/dp/0865715203/ref=cm_sw_r_cp_apa_i_ibevDb0JFSKWE