We have lived wholly off grid in a small cabin in the Deep South for 12 years. By design we have no A/C but don’t really need it. We use propane for cooking and wood with propane backup for heat. Our fridge runs off 12/24/110V. Our power usage is very modest. With all that being said, our evolving solar system has run about $12G to date. From our research for others wanting to wholly convert (which is virtually impossible if you are in any kind of city limits) a turnkey solar power system will run about $25-$30G in materials only. What we also found is that even in unincorporated areas and county residences, if power is available via a public utility, you are required to be grid tied. That means your batteries do not produce power for you when the grid goes down or is shut off.