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Originally Posted by Thalass
The MGR needs 650v, so that means I'd need a 650v nominal battery pack, yes?
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Yes. As I understand it, you need 650V if you want full power and full speed.
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I don't think the controller will do any high power buck conversion or anything.
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There has been some discussion about adding a boost circuit to Paul's controller, but the components are heavy when you get to high current and high voltage. I don't know how much weight difference there is between a 325V pack with the boost circuit and a 650V pack, for example.
Paul has been working on a fixed boost to simplify things a bit.
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That is a downside to the MGR, though as a bonus I think I could go 100km on a charge with the smallest large-format LiFePO4 pack! But it would be US$11,000. Ups and downs everywhere.
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40 a-h CALBs are about $60 each at 3.3V. 197 cells * $60 = 11,820 .. that agrees with what I've seen.
The battery packs from wrecked Leafs, Teslas, Volts .. are 1/2 to 1/3 the price of LiFePO4. I like the LiFePO4 - they stack together, no engineering required for cooling and structure ... but the cost is high.