So it's off grid to start with work

I think Tesla is running ~$1.49/watt right now. So 8kw => $12k. Add a couple powerwalls and you're around 30k before incentives

If you can do all the research and find the panels and inverters yourself, you may be able to come in cheaper than that.

Getting to 100% from solar all the time might be hard, unless you dramatically oversize it, or are fine with the occasional "day off". A propane generator backup probably wouldn't be a bad thing.

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For my address, Tesla is recommending a 16kw array, and 4 powerwalls. Cash price of $60k, but that's 100% off grid, with 12 days of backup duration shock scope

If you ever find yourself in a fair fight, your tactics suck.