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It's not only the motor weight, have you forgot the batteries total weight in addition to?
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Hi. I was referring to typical industrial motors weight, not the overall conversion. My point is that, while industrial motors have appealing specs otherwise, their weight is usually a prohibitive factor.
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the components to create a 400+volt inverter is in the thousands of dollars
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Agreed. That's a totally new class of components up there that, by not being as common, tend to be more expensive. The size of the battery pack is also going to be an issue, as mentioned above, due to weight and volume, not to mention cost. It's no secret that higher voltage yields better efficiency but overall system cost and practicality should also weigh in the equation.
JR