Looks great!
Add wind and hydro, who could ask for more?
I'm affraid those batteries are 'starting' batteries and will not perform as expected. You would surely have MUCH better results with deep cycle (trolling) batteries. ie: 2, 12v G27 100ah... or better 2, 6v golf cart batteries. Both set ups give about 200ah at 12v, will last many more years, and are more forgiving to over-discharge or abuse.
I'd use the 2 6v's. US$46.50 ea at Sams Club, if they infected your area yet.
My rule of thumb, If they list CCA, then its not a true deep cycle, no matter what the sticker on the front says. (however Trojan and a few others now list CCA on some of deep cycles...)
Keep an extra 9v battery for that $4 HF meter. When the battery gets low, it gets goofy. It may say you are down to 8.5v or up to 17v when everything is fine!
An extra battery AND an extra meter seems like an idea!
G-