I agree with the above comments. But there is one way that will work with three batteries:
Hook two 6v batteries in series and then hook a 12V battery in parallel. Not the best situation due to the mixed battery/connections situation, but in practice, ok. The problem will be finding a true deep cycle 12V battery.
It will be easier with AGMs as there is little difference between an AGM starting battery and a deep cycle one. But in that case you are probably better off just hooking three 12V Group 31s in parallel.
David
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