Electrical - 2-0 Copper
2/0-AWG Stranded Black Copper THHN Wire
http://www.lowes.com/pd_72617-295-20506245_0__?productId=50101590 $2.55. Then 6% when buy 500 feet ($2.40). Then 5% with Lowes card ($2.28). Then 10% HomeDepot match ($2.05).
The distance through the conduit from the main panel to the sub-panels in the house is about 170 feet. I need 8 wires so total length required is about 1,360 feet (perhaps 1,500 feet if it is actually 187.5 feet through the conduit).
Need to check it is ok to used jacketed cable in conduit.
Need to ask local electrical inspector what wire gauge they require.