I bought a book that covers the 12V systems:
Managing 12 Volts
How to Upgrade, Operate and and Troubleshoot 12 Volt Electrical
by Harold Barre
Summer Breeze Publishing
930 Tahoe Blvd # 802-176
Incline Village, Nevada 89451
2nd edition 2002
UPC 8 24205 01995 3
Lists at $20 USD for the 225 page paperback. Meant for boats and RV's, but we can use a good chunk of the info in there. It covers pretty much everything we deal with in the forums. Batterys, lighting
, chargers, inverters etc.
Library Call #'s (depending on your local systems)
Edit to add - I've seen it at a marine supplier, on ebay and Abes books. I may have gotten mine at half.com.