A power converter is configured to transfer energy from a photovoltaic array to a DC bus internal to the power converter. A pump within the inner chamber allows soap to flow from the inner chamber to the outer surface on demand. In a preferred embodiment, the cavitation detection means comprises a light detection means, such as a photomultiplier tube, that detects sonoluminescent emission from the fluid. A portion of the authentication information is transmitted to the proxy function module. The outer material is not attached to the first wire frame element.