This is a 12-volt DC fan that can work with a solar panel from 20 watts to 120 watts. This is very good fan in all respects: Airflow, sound intensity, vibration and efficiency. Quite suitable for solar application. Works GREAT with 120W, (~)12V panel but will work with much smaller panels too. When wired – to black and + to blue the airflow is towards the wires, the screen, towards you as pictured. The good quality motor designed for a demanding environment. It can be used it in my greenhouse. Does the job nicely and will fulfill a multitude of diverse applications. This item is Recommend buy from most customers!