Galvanic Isolator VDI-64 AVictron Energy Galvanic Isolator VDI 64 A The galvanic isolator prevents electrolytic corrosion. It blocks low voltage DC currents that enter your boat via the shore power earth wire. These currents can cause corrosion to the boats underwater metals, like the hull, propeller, shaft and so on. The galvanic isolator consists internally of two diodes which are connected in anti parallel fashion. When they are connected in this way, the diodes allow