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. Calculate 2025 solar panel installation costs, see payback periods, and explore federal and state incentives with our interactive calculator. We compared research from government and solar. It is essentially an online tool where customers input data to receive information about the estimated cost of installing a solar PV system, potential savings on electricity bills, available incentives, and the payback period for the investment.