SunPower has introduced a new series of solar panels that takes the advantages of high efficiency solar technology to another level. The new E20 series solar panel set a new standard for solar, achieving record panel efficiencies of over 20 percent. Highest efficiency panels available on the market today, including the world’s first 20 percent efficiency panel. Maximum performance: The panels that make up the new E20 Series are compatible with Transformer-less (TL) Inverters. This means that SunPower superior panel performance can now be matched with the highest performing inverters, maximising system output. Guaranteed performance: The panels are backed by the industry’s first 25 year combined power and product warranty.