120/240v residential home, owner installed a barn and needs a sub panel installed for some water heaters/lights for the animals. The contractor that installed the barn put the PVC in for me, 1 1/2 PVC 425 feet long. I want to install a 100amp sub panel but dont know if its passable. So far the best I can figure is 1/0 aluminum, and # 6 for the ground. What do you think? Do I need to drive a ground rod?, Will this even pull, its a straight shot with one 90 and thats it. Should I put this on a 60a over current device? Copper wire is out of the question due to the cost. Also the electric fence requires two ground rods so I'm a little Leary about driving a third for the panel. Can you guys give me some ideas? Keep in mind that the 1 1/2 PVC was already installed and I need to work around it. Thanks for any help that you can give me. SO 425ft long, 100a, 1 1/2 PVC, and what to do about the grounding???