A dual-axis tracker is a device that tracks the sun's movement along two axes (horizontal and vertical) to maximize the amount of sunlight captured by solar panels.
While crystalline panels can last 25 years or more, amorphous panels often have a lifespan of 10 to 15 years. In addition, they are more likely to degrade over time, which can lead to a decrease in their efficiency.
An amorphous silicon solar cell is made from a thin layer of silicon that is deposited on a flexible substrate, as opposed to crystalline silicon cells. Consequently, they can perform well in low-light conditions, have lightweight construction, and are flexible.
Solar panels are rated for hail impact which is roughly the impact of a 1" hail ball striking the panel at 52 mph. The tempered glass protects the solar cells under this type of impact.