This 4KW solar panel set is ideal to be used on the roofs of homes & small businesses & will generate electricity even when it's cloudy. Each solar cell is 125mm x 125mm for a compact panel which is efficient enough to power your home. The set comprises 16 finest top quality solar panels. Solar panels utilise the power of the sun, allowing you to take advantage of a renewable source of electricity which is kind to the environment. Solar PV is also an eligible technology under the Government's Feed-In Tariff scheme, meaning you can make a return on your investment & potentially profit from any surplus energy you export to the power grid. The rated voltage for this set is 4KW. All Trueshopping solar PV panels are MCS Accredited & come with a 25 Year Limited Warranty.