I think I finally got enough wire/cable to run all the way to the pond(650') with 100 amp service cable.

My question is if you choose to answer it is.

what is the minimum size ground/neutral that I would need?
I still will limit my amp draw at the pond(10-15 amps) but I can now increase the amount of stuff that I want to run, say a water pump or something. Still only 120 vac to the pond.

I have 8 gauge down to 10gauge down to 12 gauge on the hot side and 10 gauge neutral.

A little snow, Please!