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I don't think it's just deliberate effort but more like low production cost design. Less modules means more job done by robots less by humans assembling just 4 modules into a pack.
Looks like you're right. This might have been partly a deliberate effort on Tesla's part to keep people from easily reusing(and abusing) Mod 3 modules. Are overall pack dimensions called out in the video? I wonder if the whole pack, possibly with the electronics hump, could be used under larger vehicles, like your van?
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Won't be that easy to change voltages. Also while there are plenty off the shelf products (especially for home storage) that will accept 6s or 7s packs there are almost none that will work nicely with 25s packs. Otherwise powerful (read expensive) dc/dc inverter is needed if you wanted to hook up 100V pack to 48V DC/AC inverter.

EV conversions are rather ok with high voltage packs the only problem is as already mentioned here: it's easier to hide more smaller packs inside converted car than putting few big ones.
Anyone thinking of reusing M3 modules will just have to design their project to suit these new sizes and voltages.
Shouldnt be a problem if its considered from the start of the project.
And its early days, but i would not be surprised if someone doesnt figure out how to electrically reconfigure the module voltage/Ah design for different applications......just as was done with the mod S modules eventually.
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