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I have a 48v setup - six 8v batteries. (US 8VGC) The longest I have gone was 25 miles, and it wasn't happy the last mile. According to the Kill-a-Watt meter, I use about the same amount per mile, about 247 wH/mile. It appeared to drive normally until about 23 miles, then slowed considerably.
I would recommend he try it in steps before planning a 30 mile drive... Seems to me that distance is likely to be out of range unless the 'marine batteries' are relatively large - If they weigh 90 pounds or so each, they might just make 30 miles. (the US 8VGC I have weigh about 67 pounds. Lead = range.)
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