Please describe your system for us. I’m interested, if it is affordable and if it really works.
Choices in some components really depend on where you live. I’m too far from grid power to use it and have certain different system requirements. I mentioned batteries in the comment before this one. Components from various sources were used in the installation here.
Midnite Solar makes the most cost-effective MPPT charge controllers, in my opinion (with the Classics providing built in arc fault protection). They’re tough enough, low priced and made in America (last time I looked). For modules (PV solar panels), large, 24-watt modules will work well with MPPT controllers and will cost less money per watt. For mobile applications and certain other remote, off-grid situations, 12-volt Kyocera modules are great, with at least one vendor shipping them UPS instead of freight.
Switch boxes like the E-Panel should make it much easier for people newer to electrical work to have all of the needed switches for safety and permitting. Other helpful circuit protection includes lightning arrestors or surge protectors. Remember that DC switches must be tolerant of high currents, and that AC switches should not be substituted (unless rated for the DC application being considered).
Adequately large wire gauges are also very important in DC circuits (see the NEC: National Electrical Code). For grid-tied systems, there’s more (for example, the very important transfer switch). The batteries here are connected to each other and the inverter with short, 2/0 cables (very large) made for that purpose (not welding cable, inspectors might get grouchy about welding cables and give a fail).
It’s good to get a copy of the NEC (especially the special part of the NEC for solar systems) and use Internet searches to speed understanding of the NEC and use of good safety measures. PV solar system installs can also be dangerous for the uneducated and those who get complacent.
It’s all worthwhile for most of us, though, in my opinion (but safety first). As for where to get the information, there are information sites for PV solar installations all over the Net. Some of the vendors have some of the best information on their websites. There are also books, of course.
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