The ProCombi is based on a single power module that can work either as an Inverter or as a battery charger. When mains power is available ProCombi operates as a powerful, fully automatic, multi stage battery charger simultaneously supplying the incoming power straight through to the on-board consumers. When mains power is disconnected the unit automatically reverts to operating as an inverter, supplying 230V from the battery, until mains power is again restored. All this functionality is contained within a single box with minimal wiring required.