UNO DC/DC Converter Phoenix Contact UNO DC/DC Converter is able to cut installation costs and increase efficiency by supplying power to a control cabinet directly from a photovoltaic system. The UNO DC/DC Converter can be installed in the field and is reliable from -25°C to +70°C. Thanks to a compact design and high degree of efficiency it can also be used in small control boxes. LED function monitoring allows for a simplified startup.