Microcracks are tiny cracks, usually invisible to the naked eye, that appear on solar panels after installation. While microcracks generally develop over time through exposure to weather, they are made worse when hotspots develop. Hotspots form on the cells of solar panels when areas are covered by dirt and grime. This puts more stress on the areas that aren't covered, leading to overheating and cracking. Existing microcracks become worse when hotspots remain and new mircrocracks form, dramatically reducing the overall energy efficiency of solar panels.