Victron QUA483100100 Quattro 48/10000/140-100/100 120V VE.Bus

This inverter charger has two AC inputs and two AC outputs.  Its integrated transfer switch will automatically connect to the active source.  The output has a UPS functionality and the Quattro can take over the power supply to loads so quickly that computers and other equipment and not interrupted. Its many features include a true sine wave inverter, adaptive charging, hybrid PowerAssist technology plus multiple system integration features such as three or split phase operation and parallel operation.  Being a 48 Volt DC model it is more compact than comparable 12 and 24 volt models.