The cost of solar roofing tiles is $21 to $40 per square foot installed or $4 to $14 per watt, depending on the brand, style, roof size and complexity, and kW needed. Solar shingles typically cost more than solar panels. Before tax credits and incentives. For many people, this makes solar shingles an excellent option, often because of the style or HOA. Performance Matches Traditional Panels: Modern solar roof tiles achieve 17-23% efficiency ratings and generate 12. In the case of an integrated solar panel roof, your solar company will likely aim to maximize power output by using PV shingles to cover areas of your roof that get direct sunlight. Keep your past usage in mind in order to avoid investing in a system that will produce. Since you can power your entire home with solar roof panels alone and no connection to the grid, you could cut your electric bill in half. For a more specific savings estimate, check out Google's Project Sunroof. roof size of 1,700 square feet.