Just as important is a solar panel's degradation rate, and Hempstead Solar Power is the lowest in the industry. Over its guaranteed 25-year lifespan, a SunPower panel will provide 60 percent more power than a conventional panel.4 And, while our best-in-industry Combined Power and Product Warranty is for 25 years, SunPower panels have an expected useful life of 40 years. Call us now and we will provide you with the best experience in the industry and take advantage of the sun with Hempstead Solar Power.