You're in the same boat as me.. and I'm still wrestling with it.. We're not off grid though, just grid tied.Actually I am off grid and have the energy surplus to run it, I have already researched price, easily within budget. I am also a prepper for as are all that live and work on my ranch, not something I broadcast about though.
Remember that machine has to run for 24 to 48 hours without shutting down so you're going to need an extra 10kW of energy during the night, pure battery juice. You have batteries big enough to spare an extra 10kW at night? That's impressive if you do..