Good ground cables are also needed from modules, controllers, inverters and wherever else prescribed (to the ground, foundation steel or steel plumbing in soil but only as described in code and by component manufacturers). Oh...inverters. There are several good ones, although Magnum, Exeltech and Outback are my favorites for off-grid installation (see listings for applications whether home, mobile, etc.).
For off-grid battery array connections, there are good good sites around the Net for those. Here’s one.
http://www.smartgauge.co.uk/batt_con.html
BM