Solar panel installation costs vary significantly based on location, system size, and quality. To account for the typical energy usage of the average home in Manhattan, most homeowners require a 3. Using the figure above, a solar installation costs about $9,971, or $14,259 before the federal solar tax credit of 0. NLR analyzes the total costs associated with installing photovoltaic (PV) systems for residential rooftop, commercial rooftop, and utility-scale ground-mount systems. Through 2022, benchmarks were developed using bottom-up. Here's an exciting number: The cost of residential solar panel systems dropped a remarkable 64 percent from 2010-2020, according to the National Renewable Energy Laboratory (NREL).