Hi, Mike, Seahorse has a very simple system, which can happen when you don't have aircon. There are two conventional 30A shore connectors, in two locations. One is wired as usual to the 3kW Heart inverter/charger. The other is labeled "220V 50Hz only" and is connected to a MCarron battery charger. There is a double-throw switch so that either shore connection may be used to power the McCarron, and the McCarron is, of course, capable of this. This gives back-up capability of two chargers (but still only one inverter). A "pigtail" 30A adaptor is carried so as to accomodate foreign power receptacles. John "Seahorse" Mike Schooley asked > How do most PUPers configure their Passagemaker to connect to International > Power, i.e. 110 versus 220 AC and 50 Hz or 60 Hz?