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I really doubt you're going to kill a 5+ kWh battery in three months. Assuming you drive 10000 miles/year at 30mph, and your car uses 200W on average, then you'll put the equivalent of ~15 100% dod cycles on it, which shouldn't kill any deep cycle battery. You should fill in the specifics to get a better idea of the wear on your battery, but I really doubt you'll need more than one deep cycle battery unless you are driving more than 5 hours w/o charging and have fairly high current draws (~500W).
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