If you want a good simple but excellent reference book, then grab a copy of Collyn Rivers book called 'Solar that Really Works'. He also does one on Camper Trailers that explains it all as well. Find it online at his website.
However, the simplest system just needs the panel, regulator and appropriate cabling and lugs to link it to your battery. Your 120W panel is a good minimum starting point for most, but your required solar capacity really depends on your usage (how many items draw from your battery).
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