MISOL 10PCS -15A 45V Schottky Diode,SCHOTTKY BARRIER RECTIFIER,for solar panel DIY schottky diode 15A 45V this listing includes 10 units Schottky diodes are used in photovoltaic (PV) systems to prevent a reverse current flowing through the PV modules. For instance, they are used in stand-alone ("off-grid") systems to prevent batteries from discharging through the solar cells at night.