We made our own electro RC glider and equipped it with solar panels. After some tests we went for the Dutch endurance record and easilly did an 8 hour flight.
We made our own MPPT with a buck converter and arduino. The plane is equipped with a Pixhawk for UAV. A standard FPV system just for the fun is also built in, including antenna tracker.
The flight was done during the yearly "Modelvliegkamp 2017" in Odoornerveen, The Netherlands, with sunny and partly clouded weather.