Jim Dog: It's not prudent to believe that your sales rep in China has your best interests at heart, or that they understand your requirements, or usage scenarios, no matter how thoroughly you feel you've explained it to them. Prismatic cells do NOT necessarily need "laser welding" but I've communicated with vendors on Alibaba who claim that it is. Perhaps that's true for them, but it's not universal by any means! Most of the prismatic cells you'll want to use on your boat have terminals that take M8 (roughly 5/16 inch) bolts. It's very simple. Building your own battery pack out of 138 cylindrical cells [24s6p] seems like a project worth avoiding. You can find a BMS with 24 measurement leads, but monitoring every cell in such a pack seems pretty daunting.
Building a 32 cell pack out of CALB 180Ah prismatics [16s2p] would provide ~18Kw [15Kw usable] of energy and be supportable by off the shelf BMS units from the various suppliers of parts for EV's. You could go with 16 large capacity Winstons to make it even simpler. But, if you're looking to blaze new trails, ignore everything I've said!
[-tv]
Tom VanderMeulen
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