Check Craigslist and you might be able to find some used golf cart batteries, 2 or 4 of these 6v batteries will give you many years of useful life, the shallower discharge rates are much better for the batteries.
The larger batteries will also give you a much longer reserve, your system is so small that a large battery bank is not going to take up that much space, unless you plan on putting all of this on wheels and hauling it around.
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