Just to add. I had a hunkering about something and Mike confirmed this. We have both run about 150' on 12-2 with 70-80w loads and still be in the mid to high 11v range. with 10ga you could even do a 100w hub with 15v tap and still be kosher. Your comment about "needless to say a 15v tap isnt going to work in that situation" is unfounded and downright wrong. Just because you made a boo boo in your layout and was unwilling to run the required wire to make the trans installed work doesnt mean the trans has short comings.