Solar power in theory is a great way to fly your fixed wing drone forever, letting the batteries charge during the day, and flying on battery power at night. This idea has been shown to work with Facebook investing loads into their solar powered drone (Aquila) to provide internet to
This is a companion discussion topic for the original entry at http://blog.dronetrest.com/solar-powered-apm-plane-that-charges-your-batteries-as-you-fly/