Inv/Charge MultiPlus Compact 12/2000/80-50 120V VE.Bus, UL Cert, CMP122200102UL 458 Certified The Victron Energy MultiPlus Compact 12 2000 80 50 120V VE. Bus Inverter charger (UL) is an efficient truly sine wave inverter. This advanced battery charger will prevent an overload of constrained AC sources, such as a generator or shore power connection, by combining adaptive charge technology and a high speed AC transfer switch in a single compact enclosure. The inverter in the MultiPlus is automatically activated and takes over