The costs for an average-sized installation of a PV system in the U.S. usually range from $2.51 to $3.31 per watt. So, what does this mean for you? The size of installation that you choose to put on your home will change the cost. Installing a larger system will require more equipment and more labor, which will increase the cost. The type of panel that you choose to install will also change what price you pay. Monocrystalline, polycrystalline, and thin film panels all have different costs and efficiencies. Other factors, such as tax credits and the general cost of electricity in the state you live in, will also influence the cost of your system.