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I am installing a 2000 watt amp and system in my boat. Maximum amp draw says 30A x2. I am planning on installing a second deep cycle battery and battery Isolator. I don't want to spend an arm and a leg on the deep cycle battery but i want to be able to run the stereo for at least an hour at moderate levels without draining the battery. Any thoughts or suggestions? Can I add two deep cycles as the "second" battery or would that be to much to charge with the alternator? Thanks