Wire Cost

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About

NM-B house wire is specified for 60C by the NEC, but it can withstand 90C. [1]
2AWG is rated for 95A at 60C, 1 AWG is rated for 110 at 60C [2]
USE-2, RHW-2 and RHH - sunlight, heat, moisture resistant [3]
Aluminum ampacity - 1/0 aluminum does 100A at 60C. Good chart of wire types and their T resistance [https://wire.buyawg.com/viewitems/all-categories-appendix-allowable-ampacities/sulated-aluminum-or-copperclad-aluminum-conductors

Cost

6/3 NM-B is $5/ft [4] or [5]

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