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This seems to be a good battery to use for a wide variety of solar purposes. Its AGM which is very clean and safe, 105 Ah which can output 105 watts for 12 hours (or 12 watts/1amp for 105 hours). Cost is around $150.
Although you could use this to build a large battery bank, this is also a good size battery to use alone in small solar configurations. For small solar buy a cheap charge controller such as this one for around $35-40 which can handle panels up to around 80 watts.