Since getting an HF radio, I have been interested in powering it without utility power. I live in a rural area where the power goes out occasionally, and the ability to communicate would be handy for those times where utilities are out for long periods. I found a very helpful vendor – https://www.sunwize.com/ who helped me select an appropriately sized system. I ended up with a single panel and a couple of large batteries that should run my radios for a couple hours of transmit time @ 100 watts per sunny day. I used https://solarpoweredhamradio.com/ as a starting point. Once it is set up I will review the specifics and how practical it is.