Shading can dramatically affect the performance of solar panels, as it reduces the amount of sunlight hitting the solar cells. Even partial shading can cause significant losses in energy production, leading to higher electricity bills. In cases where shading is unavoidable, solutions like solar panel optimizers or microinverters can be used to ensure each panel performs at its maximum capacity. However, these solutions add to the initial cost of the installation. It�s important to evaluate the shading on your roof before deciding on the system size and components.