This is a combination 240v Power supply with all the features of the 12/800  inverter as well as a 35A battery changer.
The advantage of this unit is that to provides seamless power when switching between Generator power and Inverter power and at the same time when the generator is running, the batteries are being charged.
 
It gives priority to generator power and when the generator is switched off, power is maintained from the batteries by the inbuilt 800 w inverter.
 
Nice unit and sized right for 600A/H 12v houseboat battery systems.