We've seen products from https://oxblue.com/ on a couple of large work sites. One was a PTZ powered by about 18 square feet of solar cell and connected with Oxblue via RF. The other was also an RF connection but used a power cord. It's monitoring, from the adjacent roof, the construction of a tiltup warehouse that will be about 300 feet by 1500 feet.

Could be pricey. I never asked.