The Victron Energy ORI481224120 Orion-Tr Smart 48/12-20A is an isolated DC-DC charger designed to charge a 12V auxiliary or service battery from a 48V DC source. It combines a fully programmable charging system with galvanic isolation, Bluetooth monitoring and configuration, remote on/off control, and an adaptive three-stage charging algorithm.

The charger provides 20A continuous output at nominal output voltage, with 280W continuous output power at 25°C. It can also operate as a DC-DC power supply, making it suitable for properly designed dual-battery and DC power systems requiring isolated voltage conversion. The manufacturer's specification table identifies this model as the 48/12-20 version within the Orion-Tr Smart isolated charger family. 

Key Technology

• Isolated DC-DC Charging
  Provides galvanic isolation between the input and output sides, electrically separating the source battery system from the auxiliary battery circuit.

• Bluetooth Smart
  Built-in Bluetooth allows compatible phones, tablets, and other devices to monitor the charger, change settings, and perform supported firmware updates through the VictronConnect app.

• Adaptive 3-Stage Charging
  Uses a bulk, absorption, and float charging algorithm designed to properly recharge compatible batteries while adapting charging behavior to battery usage.

• Fully Programmable Output
  Charging parameters can be configured for different battery requirements, and the output voltage can also be adjusted when the unit is operating as a power supply.

• 200VDC Galvanic Isolation
  The isolated design provides 200VDC isolation between the input and output case, helping maintain electrical separation between the two DC circuits.

• Remote On/Off
  A compatible remote switch or relay contact can be connected to the two-pole remote connector for external charger control.

• Parallel Operation
  Multiple compatible units can be connected in parallel when additional output current is required.

• Short-Circuit Protection
  The charger incorporates output short-circuit protection for added system protection.

• High-Temperature Protection
  Output current is automatically reduced at elevated ambient temperatures to help protect the charger.

Best Uses

• 48V to 12V Battery Charging
  Designed for charging a compatible 12V auxiliary or service battery from a 48V battery or DC electrical system.

• Dual-Battery Systems
  Suitable for systems where the source and auxiliary batteries operate at different nominal voltages and require electrically isolated charging.

• Vehicle Auxiliary Battery Systems
  Suitable for properly designed vehicle installations where a 48V source system supplies a separate 12V service battery.

• DC Power Supply Applications
  Can be configured as a stable DC power supply when battery-charging operation is not required.

• Systems Requiring Galvanic Isolation
  Useful where electrical isolation between the source-side and output-side DC circuits is an important system requirement.

• Expandable Charging Systems
  Parallel operation allows compatible chargers to be combined where the required charging current exceeds the capability of a single unit.

Product Specifications

Smart Isolated Charging from 48V to 12V

The Victron Energy ORI481224120 Orion-Tr Smart 48/12-20A Isolated DC-DC Charger combines programmable battery charging, galvanic isolation, Bluetooth monitoring, remote control, thermal protection, and parallel capability in a versatile DC charging platform. It provides a practical solution for properly designed systems requiring reliable charging of a 12V auxiliary battery from a 48V DC source.

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