I got myself a nice project a while back for a camera on a pole where there was no power. Got a 100w solar panel, two 12v/20wh batteries for marine vehicles, a solar controller, a 24v stepup for a POE switch to power camera the camera and shared the controllers output between the stepup and the mikrotik sxt 5. I then mounted everything, setup another sxt5 on the building, and voila!
Edit: i eventually added an additional cam
Second edit: heres a pic of the final product