Been doing it for years. Works quite well.
Takes a little bit of work, and knowing what you want to accomplish, and selecting suitable gear for the purpose.
It's just a simple battery power system that is recharged by the solar panels.
Not for high-power amp applications, typically.
Great for a low power SET application.
Teres makes a battery power supply for their TT.
I had a custom made David Berning SET-ZOTL amp built by David for this application.
You can run a battery powered preamp, or if you need to you can use a high-quality pure sinewave inverter to run any gear that has to run on 120vac.