Leisure Batteries for Solar systems

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You could try Go Outdoors. They're cheap and do leisure batteries. Just be warned, however, that leisure batteries and proper deep cycle batteries are not the same thing. A leisure battery will certainly last better than a car starting battery in a solar PV setup, but it won't be as durable as true deep cycle batteries such as the 2nd hand forklift batteries being discussed here. Leisure battery will be the cheaper option however.