Hi Diver - here are my numbers:
aluminum:45'
copper: 82' (not 87')
wire size: inverting KIL to find cmils, and using a desired Vd of 3%, i got #4 for the SE aluminum cable and #6 for the copper.
Ambient temp: good question. we're in Montana; the wire will be run through a basement crawlspace (alum.) in no conduit; and then outside along a cement pad in PVC sch.80 (copper).
Take it from there.
