Victron Energy Autotransformer 120/240V AC – Step Up/Down, Split Phase

Flexible voltage management for 120/240V systems

The Victron Energy Autotransformer 120/240V AC is a compact module designed to bridge your 120V and 240V needs with reliability. It supports step up, step down, and split phase output balancing, enabling you to power a wider range of devices from a single source. In practice, this means you can run 240V appliances from a 120V supply or pair two 120V lines for a balanced 120/240V setup. The enclosure is built to withstand real world use in homes, RVs, boats and remote cabins where voltage conditions vary.

Key capabilities and real life use cases

• Step up and step down: adapt a 120V supply to 240V devices and vice versa.
• Split phase balancing: align two 120V outputs for a stable 120/240V feed with compatible inverters.
• Temperature protection with manual reset: automatic shutdown safeguards connected gear and the transformer.
• Alternative to inverter stacking: replace two 120V units with a single 240V inverter plus autotransformer.
• Ground relay included: seamless integration with Victron Multiplus or Quattro Inverter/Chargers.
• Compatibility with mixed environments: supports diverse loads in homes, RVs, boats and cabins.

System integration and benefits

Used with a Victron inverter charger, the autotransformer can simplify voltage management by centralizing conversion. It can reduce cable runs and minimize voltage drop, helping you achieve a balanced supply in setups that combine solar, shore power and battery storage. The ground relay helps synchronize with Multiplus or Quattro for safer operation.

Safety, installation and maintenance

Overheating protection is a key safety feature: if temperatures rise, the transformer disconnects automatically from the supply and requires a manual reset. Proper ventilation and load distribution are advised; consult a qualified installer for complex balancing tasks and to ensure compliance with local electrical codes.

Getting the most from your Victron ecosystem

By adding the autotransformer to your Victron system, you gain a modular component that adapts to changing power demands. It is suitable for applications ranging from temporary off grid events to permanent off grid dwellings, where voltage flexibility supports a broader set of appliances and tools while maintaining energy efficiency and safety.