Craig,
An Easytouch automation panel IS a subpanel with 8 breaker slots.
Bottom line is the OP can run 3 conductors using #3 copper, and one ground using #4 in 1 inch conduit (PVC) attached to the house. (Craig, your using the wrong table for conduit fill. For schedule 40 PVC, which is all he needs, the proper table is C10, not C8. C8 is for EMT).
He can run #3 copper and #4 ground with a 100 amp breaker in his main in 1" PVC and be completely code compliant. I like to run as much power as I can. You never know what you might need in the future. It's just as easy to run a little bigger wire up front.
Let's don't go all TFP difficult (like I know we can, LOL). Its a pretty straightforward project.