Thesis Solar-Powered-Trash-Collector-on-Water (1)

A lot of applications use a battery as everybody is used to do it. However some applications could also work without battery, operated "as and when the sun shines". https://www.researchgate.net/publication/331907430_Direct_use_of_PV_panels

The advantage is that it avoids the cost of the battery, the battery management system. The lifetime might increase. But it means that the propeller would go faster when it is sunny. Maybe using a bit more voltage, as the low voltage is now dictated by the battery.