Is "you know a guy" code for "I'm that guy"?

And yeah, the battery prices keep coming down. It's really amazing to watch in real time. A 100ah 12V battery used to be ~$1000, now it's a fraction of that. And 400ah 12V batteries are becoming common.

But, the rest of the electrical system isn't cheap... solar panels, MPPT controller(s), fuse panel and things, control panel, etc. If you need 120V, add an inverter. If you want 120V AC, that inverter needs to be pretty big. Etc. Probably looking at $10k+ for my dream system (granted, that's down from $20k 5 years ago).