Solar panels can work through glass, but the efficiency of the panels will be reduced. Glass, particularly tinted or low-E glass, can reduce the amount of sunlight that reaches the solar panels, decreasing their ability to generate electricity. Additionally, glass can also cause reflections and glare that can further reduce the efficiency of the panels. It is important to note that the amount of reduction in efficiency will depend on the type and thickness of the glass, as well as other factors such as the angle of the sun and the location of the panels.