> and value your time at $0 because it’s fun.

I don't know if you were being ironic or not but... that's an absolute truth. Our free time doesn't have a fixed rate. It doesn't have a rate at all. What you do during free time can be basically seen as either:

* a chore you don't like to do

* something you like to do.

Any task can swing between those states depending on your mood. If installing your own solar plant or self-host your server rack (as OP is doing) is something you enjoy doing, then yes, it costs exactly $0 in labor.