We have delivered more than 1000 pieces of the 140 watt polycrystalline panel over the last three years, for example to Vacon and VTT, which manufacture frequency converters. The 140 W solar panel is used in large quantities for network systems and therefore we are also able to offer individual needs more competitively than competitors. Even Cheap Stores, which do not have the expertise or service, will have to keep a higher price. High quality TÜV approved solar panels are equipped with MC4 connectors. In SolarXon solar panels, the aluminum frame is such that it can be glued, for example, to the caravan ceiling. The connection box is lower than the aluminum frame.