External power is required to make the PVM gage line compatible with existing MurphyLink products, such as PV1000, Cascade, iGuard and eGuard. The PVS-5 power supply device supplies 5 volts of external power and load dump protection for up to 6 PVM gages. The maximum length of the power and data connection between gages is 0.5 meters (8.5 meters total).