Skydweller Aero Signals Dawn of Practical Solar Flight - Forbes Skydweller -

A Skydweller solar-powered drone just successfully completed a series of test flights with U.S. Navy funding. This time the longest flight was 'just' 22.5 hours, but in operation the aircraft will fly patrol missions lasting for weeks, powered by solar cells in the day and batteries at night.

https://www.skydweller.aero/news/forbes-skydweller-aero-us-navy-eternal-drone-solar-flight/