100 watt Solar decision

In an odd turn of events, I ended up getting 2 of the 90$ sams club duracell 90$ 6 volts. Only because of a spontaneous job interview that was 400+ miles round trip. THANKS FOR POINTING THEM OUT TO ME. They were super affordable but also the core charge was ONLY 5$ when the core charge for interstate was quoted at 25$ so I will take the small amp hours loss. And the funny thing is even though I only get about 11mpg with my truck, I'd bet the money I spent on going to that job interview driving over 400 miles and getting the sams club batteries with the club membership (45$) was about the same as the interstate batteries cost. But seriously, interstate does have a good reputation and convenience factor.

BTW, does anyone know where I could find a place that has a "pre-crimped" wire that would put the two batteries in a series with thick gauge? The few places that were on my trip only had 6 gauge and im thinking 2 or 0 gauge is what is ideal. But only from articles I read online, maybe I'm wrong?