Sure, but by taking your website down at certain times (or allowing the system to take itself down), you force your ideas about slowing down onto others who may or may not have time for that right now. It is actively hindering other people from trying to live the way they want (by reading about solar powered websites, in this case).

It does not really matter for the Low Technology website of course, but if you get into a serious car accident and the surgeon is like "sorry but our solar powered operating theater is down right now, that's just life sometimes" that would be a very unwelcome thing to hear.