Yes. Shading reduces the output of your solar panels, leading to a longer payback period and affecting your ROI. High-quality panels reduce solar electricity bills by 50 percent to 70 percent, and most residential solar power systems in full sun have an average payback period ranging from five to 10 years. With proper maintenance, solar panels last 25 to 30 years, granting you 15 to 20 years of payment-free energy and reduced electricity bills.