You can put together a simple and fully independent solar island with 5kw/h capacity and 7kw nameplate generation for $4100. This is a plug and play system, with zero wiring and no knowledge needed. For the idea of the kind of profit margin that includes for the company, their "smart isolation switch" is $1k. Jackery has several competitors, and all of their build quality is pretty good, and the warranties are acceptable.

20kw/hr of just storage is about $10k. Every one of these companies also has standard DC input ports for bring your own solar panels, because their panels are overpriced.

The 8-Bit guy has been using such a system to maintain his studio. It is reliable, uses cheap solar panels. This stuff is commodity.