Autotransformers

Victron Autotransformers for Off-Grid and Marine Systems

Australian off-grid setups, marine vessels, and heavy-duty RV applications often require robust voltage conversion and system balancing. Victron autotransformers provide seamless step-up, step-down, and split-phase balancing, ensuring your power system runs safely and efficiently. Designed for demanding applications, these heavy-duty units are essential for running 120V and 240V equipment from a single power source. As an Australian family business with a decade of experience, we provide high-quality products alongside fast dispatch, so you can get your electrical build completed on time.

What is an Autotransformer?

Unlike an isolation transformer, an autotransformer uses a single continuous winding to step voltage up (for instance, converting 120V to 240V) or step it down (converting 240V to 120V). In advanced setups, Victron models, including the 32A and 100A variants, are highly effective at balancing the load in a split-phase 120/240V electrical system. When high-draw appliances create an imbalance on one leg of the system, the autotransformer absorbs the unbalanced current, preventing your inverters from overloading and shutting down.

Key Benefits of Victron Autotransformers

• Voltage Step-Up and Step-Down: Seamlessly convert voltages to match your specific equipment needs, whether you require 120V or 240V outputs.
• Split-Phase Load Balancing: Distributes power evenly across a 120/240V split-phase setup to prevent single inverter overloads.
• High-Efficiency Power Transfer: Ensures minimal energy loss during the conversion process, keeping your battery bank performing optimally.
• Ultra Durable Construction: Encased in tough enclosures built to withstand the physical and thermal demands of marine environments and remote off-grid sheds.
• Thermal Protection: Integrated temperature sensors and active cooling mechanisms allow for safe continuous operation under heavy loads.

Common use cases for caravan, RV, marine, 4WD, off-grid, tiny home, commercial, industrial, boats, or truck shoppers

• Marine Vessels & Boats: When docking at international marinas or travelling abroad, you may encounter different shore power voltages. An autotransformer allows your 240V boat to safely accept 120V shore power, or vice versa, ensuring your onboard batteries and appliances remain fully operational.
• Off-Grid Homes & Tiny Homes: In large off-grid systems utilizing multiple 120V inverters stacked for 240V, an autotransformer balances the load if you plug in a heavy 120V appliance, protecting your primary power supply from tripping.
• Imported RVs & Caravans: When importing a recreational vehicle that operates on a 120V system, an autotransformer is required to adapt it safely for use with standard Australian 240V caravan park power pedestals.

Choosing the Right Voltage Solution

When selecting your unit, consider both your maximum load requirements and whether your system requires strict electrical isolation. While autotransformers are excellent for voltage conversion and load balancing, they do not provide galvanic isolation. If preventing galvanic corrosion is a priority for your boat, you may need to look at specific isolation solutions that also offer step-up or step-down functionality.

Ready to Upgrade Your Power System?

Navigating international voltages, split-phase balancing, and complex wiring requires reliable and proven equipment. Trust in our Victron autotransformer range to deliver stable, high-performance power conversion for your most critical applications. We back our customers with extensive before and after support, ensuring you have the technical guidance needed for a successful installation. Browse our collection today and secure the perfect voltage management solution to keep your appliances running smoothly.