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 boat\u2019s 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 current in both directions but only above a certain threshold voltage. The voltage at which diodes conduct is about 1.4 Vdc. <\/p>
The isolator is installed directly behind your boat's 230V connection. The forward voltage from the galvanic isolator is higher than the potential difference between metals. As a result, this voltage will not allow conduction and as such, the galvanic isolator will prevent any electrolytic current. However, if there is a (higher) error voltage in the AC circuit, the diodes will allow current through and the residual-current device will break the circuit.<\/p>","modified_at":"2025-09-15 13:46:24","image":"https:\/\/www.victronenergy.com\/upload\/products\/339_583_20180713112314.png","sku_information":[{"sku":"GDI000032000","created_at":"2015-05-13 14:36:53","html_description":null,"is_eol":false}],"documents":[{"id":3367,"sku":["GDI000016000","GDI000032000","GDI000064000"],"name":"Galvanic Isolator VDI-16, VDI-32 and VDI-64","document_type":"Product Manual","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Manual-Galvanic-Isolator-EN-NL-FR-DE-ES-IT-TR.pdf","notes":""},{"id":6852,"sku":["GDI000016000","GDI000032000","GDI000064000"],"name":"Declaration of Conformity - Galvanic Isolators","document_type":"Certificate","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic-Isolators-2021-12-29.pdf","notes":""},{"id":11161,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32","document_type":"Enclosure dimension","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic-Isolator-VDI-32.pdf","notes":""},{"id":11162,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32 (3D)","document_type":"Enclosure dimension","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic-Isolator-VDI-32_3D.pdf","notes":""},{"id":11163,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32 (stp)","document_type":"Enclosure dimension","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic-Isolator-VDI-32.STEP","notes":""},{"id":11694,"sku":["GDI000016000","GDI000032000","GDI000064000"],"name":"Brand video","document_type":"Promo video","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Promo videos\/Ad videos\/Brand video\/16x9\/EN_Brand video.mp4","notes":""},{"id":8142,"sku":["GDI000016000","GDI000032000","GDI000064000"],"name":"Narrow Boat MultiPlus 3kVA 230VAC 12VDC 2x200Ah Li-NG Lynx Class-T Smart BMS-NG Distributor Cerbo GX touch-50 SBP-220 MPPT 100-50 extra Alternator WS500-Pro Bow thruster Galvanic isolator BMV-712","document_type":"System schematic","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Narrow-Boat-MultiPlus-3kVA-230VAC-12VDC-2x200Ah-Li-NG-Lynx-Class-T-Smart-BMS-NG-Distributor-Cerbo-GX-touch-50-SBP-220-MPPT-100-50-extra-Alternator-WS500-Pro-Bow-thruster-Galvanic-isolator-BMV-712.pdf","notes":""},{"id":3691,"sku":["GDI000016000","GDI000032000","GDI000064000"],"name":"ISO9001 certificate","document_type":"Certificate","url":"https:\/\/www.victronenergy.com\/upload\/documents\/ISO9001-certificate-2024-EN.pdf","notes":""},{"id":366,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32 (top)","document_type":"High quality photo","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic Isolator VDI 32_top.jpg","notes":""},{"id":367,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32 (side)","document_type":"High quality photo","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic Isolator VDI 32_side.jpg","notes":""}],"external_images":[],"main_images":[{"id":366,"sku":["GDI000032000"],"name":"Galvanic Isolator VDI-32 (top)","document_type":"High quality photo","url":"https:\/\/www.victronenergy.com\/upload\/documents\/Galvanic Isolator VDI 32_top.jpg","notes":""}],"sku":["GDI000016000","GDI000032000","GDI000064000"],"qr_images":{"png":{"black_on_white":"https:\/\/www.victronenergy.com\/qr-image\/5T.png?foreground=000000&background=ffffff","white_on_black":"https:\/\/www.victronenergy.com\/qr-image\/5T.png?foreground=ffffff&background=000000","white_on_blue":"https:\/\/www.victronenergy.com\/qr-image\/5T.png?foreground=ffffff&background=4790d0","white_on_transparent":"https:\/\/www.victronenergy.com\/qr-image\/5T.png?foreground=ffffff&transparent=true"},"svg":{"black_on_white":"https:\/\/www.victronenergy.com\/qr-image\/5T.svg?foreground=000000&background=ffffff","white_on_black":"https:\/\/www.victronenergy.com\/qr-image\/5T.svg?foreground=ffffff&background=000000","white_on_blue":"https:\/\/www.victronenergy.com\/qr-image\/5T.svg?foreground=ffffff&background=4790d0","white_on_transparent":"https:\/\/www.victronenergy.com\/qr-image\/5T.svg?foreground=ffffff&transparent=true"}},"pms_technical_data":[{"sku":"GDI000032000","field_name":"dCConnectionTerminalType","field_value":"M6 bolts"},{"sku":"GDI000032000","field_name":"depth","field_value":"200 mm"},{"sku":"GDI000032000","field_name":"height","field_value":"63 mm"},{"sku":"GDI000032000","field_name":"material","field_value":"Anodized aluminium"},{"sku":"GDI000032000","field_name":"maxCurrentRating","field_value":"32 A"},{"sku":"GDI000032000","field_name":"peakCurrentRating","field_value":"3,200 A"},{"sku":"GDI000032000","field_name":"protectionCategory","field_value":"IP67"},{"sku":"GDI000032000","field_name":"weight","field_value":"2 kg"},{"sku":"GDI000032000","field_name":"width","field_value":"164 mm"}]}]