Hot spots can occur as a result of poor manufacturing processes, they are small defects not visible to the human eye which exist within the solar cell. Under certain weather conditions these hot spots can heat up to 250 °C. At best these localised hot spots can cause power generation reduction, at worst, the heat can cause a module fire.
Potential Induced Degradation (PID) basically refers to the leakage of current through the modules components under certain weather conditions which results in reduced efficiency. A reduction in efficiency means less power generated and less money saved.
Q CELLS guarantees as part of their standard warranty against both of these potential faults. The Q Cells Solar Panels are one of the very few products available that offer this level of protection