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I wish I could add a lot more, but everyone here has said almost all I could offer. I will suggest, if you go the 6 volt route wired in series to make 12 volt, use the largest wire/cable you can find to hook the 2 together. I used 4-0 which is the size of a large man's thumb on my battery bank, (4, 6 volt Golf Cart batteries wired is series and parallel to make 12 volts) for the solar setup I just finished. I am convinced that the largest wire/cable you can find works best.
Another suggestion. Make a plan and put it on paper, as Greg/Gkerlin did, so you can build your system in steps so you can add to it later and not make as many expensive mistakes as I did. I have a very successful battery and solar charging system, but I also have a box of used parts because I didn't make a plan for future additions.
Good luck on what ever you decide, just don't do it blindly. Make a plan and put it on paper.
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