The Trueshopping 4KW solar panel set is perfect for domestic installations. The compact design of the panels means roof space is not wasted and the look of the finished fit is neat. The set comprises 16 top quality solar panels that will generate electricity even when it's cloudy. Panels use bypass diode technology to minimise the power drop caused by shade and deliver up to 15.5% efficiency rates. Each solar cell is made up of tempered glass, EVA resin, and a weatherproof film for a prolonged life system. By using the power of the sun, solar panels provide a renewable source of electricity which is kind to the environment and free. Furthermore, solar PV is an eligible technology under the Government's Feed-In Tariff scheme, meaning you can make a return on your investment and potentially profit from any extra energy you send to the power grid. The rated voltage for this set is 4KW. All Trueshopping solar PV panels are MCS Accredited and come with a 25 Year Limited Warranty on Power Output. This assures 80% power output over 25 years, 90% power output over 12 years and defect free materials and workmanship for 10 years.