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Well, the specs say the motors are rated at 200A (I assume continuous) and 400a peak. I'd approach the problem a little differently. First you have to determine the current draw at cruising rpm. Say it's 100a per motor. I suspect it will be less, but let's use this as an example. You'll need a generator that can deliver 200a to the motors. Factor in losses and you'll probably want the ability to recharge your batteries while cruising and you're looking at perhaps 250a or an 18kw dc generator. Now you can cruise until your fuel runs out. Next, ask yourself how long you'd like to run without starting the genny. If your answer is six hours, you need 200a x 6 hours x 2 = 2400 amp hours. 12 8d batteries will get you roughly 2400 amp hours (6x12v per side). Want to go lighter? 12 4d batteries get you roughly 1800 amp hours, good for 4.5 hours of cruising. I multiplied your amp hours needed by 2 so you only draw you batteries down 50%.
Hope this helps.
Brett
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