Victron Autotransformers

Victron Energy Autotransformers provide essential functionality in advanced AC power systems by enabling step-up, step-down conversion and split-phase output balancing in 120/240VAC installations. These transformers are especially useful in mobile, off-grid, and marine energy systems where load balancing across split-phase power is critical for optimal performance.

Key Applications:

• Step-up: 120V input to 240V output
• Step-down: 240V input to 120V output
• Split-phase balancing: Distribute unbalanced 120V loads over both legs of a 240V supply

Core Features:

• Toroidal transformer for efficient, silent operation
• Built-in ground relay for proper GFCI operation and system safety
• Thermal protection: disconnects on overheat; manual reset required
• IP21 aluminum enclosure – durable and compact for onboard or mobile applications
• Ideal alternative to stacking inverters for 120/240V supply needs

Example Use Case – Split Phase Balancing:

In a 120/240V split-phase system, unbalanced 120V loads on each leg can limit total usable power. A 30A supply may only deliver 4.8kVA (67%) due to current imbalance. The autotransformer resolves this by creating a new neutral, balancing the load across both legs. This enables use of the full 7.2kVA potential while protecting the power source.

Technical Specifications:

Autotransformer Use Scenarios:

• Generator Balancing: Efficient use of available output power from split-phase generators
• Inverter Systems: Eliminates need for stacked inverters by converting 240V to split-phase
• Off-Grid Homes or Marine Installations: Balances 120V loads to prevent breaker trips

Warranty: 5 years
Brand: Victron Energy