Combined with an IVET transformer, this transfer system ensures that the shore voltage is correctly adapted. As a consequence a 230/50Hz installation will work without problems when connected to a 120V/60Hz shore power point. This occurs, for example, in the United States and the Caribbean. To convert 50Hz into 60Hz or vice versa, a battery charger, inverter or frequency converter is needed. Mastervolt supplies three automatic Transfer systems: of 6, 9 and 13 kVA capacity respectively.