Are you planning PV system? Assuming so, I agree with the other poster: wire for and run 110 v. Yes, it'll take an inverter, but the lights won't add too much usage compared with the washing machine. The higher cost of 12 v. lights, etc., will offset the lower costs of 110 v. wiring. Of course, you could purchase a wash. machine with 12 v. motor, or alter a 110 v. one [newer ones may have digital controls, etc. that would be a hassle or could be]. At least that's what I would do: run everything 110 v. with inverter. If it wasn't for the wash. machine, I would probably be more in favor of the 12 v. lighting. Plus, if you use clippers and other tools 110 v., like you said, and all horse people need them, you gotta have a decent 110 v. system anyway. Plus, if for any reason you need to run other equipment...tools, etc....it'll be a no-brainer to be able to plug into a regular 110 v. outlet.