Isolation Transformers

Isolation Transformers

ProductVOLTAGECapacitySort page by dimensionsDimensions (LxWxH)
Victron isolation transformer 7000Win: 115VAC out: 230VAC7000W362x258x218mm (lxwxh)
Victron isolation transformer 3600Win: 115VAC out: 230VAC3600W362x258x218mm (lxwxh)
  • Victron isolation transformer 7000W

    Victron isolation transformer 7000W

    • Victron
    • in: 115VAC out: 230VAC
    • 7000W
    • 362x258x218mm (lxwxh)
    more info
  • Victron isolation transformer 3600W

    Victron isolation transformer 3600W

    • Victron
    • in: 115VAC out: 230VAC
    • 3600W
    • 362x258x218mm (lxwxh)
    more info

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Victron Isolation Transformers

When a ship is plugged into the shore power system (230V), electrolytic corrosion may occur if you do not install an isolation transformer to prevent this. Electrolytic corrosion happens when there is a galvanic voltage between two different kinds of (underwater) metals. Seawater is a great electric conductor and can, potentially, cause strong corrosion to your boat. However, fresh water is also an electrical conductor. To prevent corrosion on your propeller, shaft and other metal parts of the boat, zinc anodes are mounted to the boat. This will then take the corrosion instead of other, more important, parts of your ship.

Safety and the prevention of galvanic corrosion

The isolation transformer eliminates any electrical continuity between AC shore power and the boat. It is essential for safety and eliminates the need for galvanic isolators and polarity alarms. Safety is taken for granted in case of a normal on-shore installation. A fuse will blow or a GFCI (Ground Fault Current Interrupter) will trip in case of a short circuit or current leakage to ground. Connecting the ground wire of the shore-side supply to the metal parts of the boat will result in galvanic corrosion. Bringing only the live and neutral wire on board results in an unsafe situation because GFCI’s will not work nor will a fuse blow in case of a short circuit to a metal part on the boat.

Shore power socket without earth and GFCI is dangerous

It is a misunderstanding that galvanic corrosion occurs only in metal and aluminium hulls. In fact it can occur on any boat as soon as a metallic part (the shaft and propeller) is in contact with water. Galvanic corrosion will quickly dissolve your sacrificial anodes, and attack the shaft, propeller and other metal parts in contact with water as soon as the boat is connected to the shore-side supply. It might therefore be tempting not to connect the ground conductor: this is however extremely dangerous because GFCI’s will not work nor will a fuse blow in case of a short circuit to a metal part on the boat.

Corrosion can be prevented with isolation transformers

The best solution to avoid galvanic corrosion and at the same time prevent any unsafe situation is to install an isolation transformer to connect to the shore-side supply. The isolation transformer eliminates any electrical continuity between shore power and the boat. The shore power is fed to the primary side of the transformer and the ship is connected to the secondary. The isolation transformer completely isolates the boat from the shore ground. By connecting all metal parts to the neutral output on the secondary side of the transformer, a GFCI will trip or a fuse will blow in case of a short circuit.

Advice on installing isolation transformers

It is also recommended, for optimal safety, to connect the secondary neutral of the transformer to ground when the boat is out of the water.

How does an isolation transformer work?

The best way to prevent galvanic corrosion reliably is by installing an isolation transformer. How this isolation transformer works can be seen in the image below:

Victron isolation transformers

Victron isolation transformers are important parts of your ship. The high-quality technique used by Victron prevents galvanic corrosion and ensures your electrical system performs safely. The Victron galvanic isolators work with high efficiency and are equipped with Softstart circuitry, which ensures that the shore circuit breaker will not overload.

Battery Monitors Victron (BMV)

Intercel is a supplier of Victron Battery Monitors. These battery monitors are part of the well-known BMV series (Battery Monitor Victron). These monitors work with great precision and can accurately display the amp-hour and charging status of your battery. The BMV series always uses the latest technologies, such as the feature that measures the longevity of the battery, and the connectivity with Bluetooth or the VictronConnect app, which allows you to connect your battery monitoring systems easily with other devices.

Applications for Isolation Transformers

  • Boat