PV Module Bypass Diodes – What are they and what do they do?
Bypass diodes (free-wheeling diodes), are wired within the PV module and provide an alternate current when a cell or panel becomes shaded or faulty.
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This article explains the importance of using a diode in a solar panel system to prevent current from flowing back into the batteries. Bypass diodes are connected in parallel across solar cells to provide an alternative current path when the voltage across a cell is negative due to shading or it becoming faulty This use of bypass diodes in solar panels allows a series (called a string) of connected cells or panels to continue.
