Overview

The Victron Energy ORI124838120 is an Orion-Tr Smart 12/48-8A isolated DC-DC charger for charging a 48V service battery from a 12V starter or alternator source on board. It works with an 8-17V input range and has a 48.2V nominal output, with the output adjustable from 40-60V for the battery profile being used.

This charger uses an adaptive 3-stage charging algorithm for bulk, absorption and float charging, and it is suitable for lead-acid and lithium batteries when configured correctly. Built-in Bluetooth allows setup and monitoring through VictronConnect, which is useful when the charger is mounted inside a console, machinery space, electrical locker or other protected area.

The isolated layout keeps input and output grounds separate, which helps when the starter side and service side of the vessel need to remain electrically separated. Output is rated at 8A at nominal voltage and 40°C, with continuous output power rated at 360W at 40°C and 430W at 25°C.

Key features

• Isolated DC-DC charging separates the input and output grounds for cleaner integration between starter and service battery circuits.
• 12V input range of 8-17V supports alternator-fed charging from a 12V starter battery system.
• 48.2V nominal output with a 40-60V adjustable output range for matching the charging profile to the battery bank.
• Adaptive 3-stage charging covers bulk, absorption and float stages for lead-acid and lithium battery installations.
• Built-in Bluetooth allows configuration, monitoring, history checks and alarm viewing through VictronConnect.
• Remote on/off input reduces the need for a high-current switch in the main input wiring.
• Engine running detection helps prevent unwanted discharge of the starter battery when the alternator is not charging.
• IP43 protection for the electronic components applies when the unit is installed with the screw terminals facing downward, with IP22 protection at the connection area.
• Screw terminal DC connections accept cable cross-section up to 16 mm² (AWG 6).
• Operating temperature range is -20°C to +55°C, with derating above 40°C.

Electrical and system integration

This charger fits boats that use a 12V engine-start system but need controlled charging for a 48V service battery bank. It is especially useful where direct alternator charging is not appropriate and the service bank needs a regulated charge profile rather than a simple voltage feed.

The output voltage can also be set as a fixed output through Bluetooth, so the unit can serve as a DC power supply in suitable installations. Multiple units can be connected in parallel when more output current is required, provided the system wiring, protection and battery requirements are planned accordingly.

Installation and fit

Mount the charger in a protected, ventilated electrical space rather than an area exposed to washdowns, standing water or salt spray. The electronic components carry IP43 protection only when the screw terminals face downward, so orientation matters during installation.

The unit uses screw terminals and has a maximum cable cross-section of 16 mm² (AWG 6). Allow space for cable bends, airflow and access to the terminals, especially in compact battery lockers or behind helm panels where service access can be tight.

Use cases on board

This unit is a strong fit for cruising boats, fishing boats and workboats that are adding a 48V service bank while keeping a 12V starter battery and alternator arrangement. It also suits refits where Bluetooth setup is helpful because the charger will be mounted out of sight but still needs routine checking during commissioning and seasonal maintenance.

For best results, match the charge settings to the battery manufacturer’s requirements and size the wiring, overcurrent protection and ventilation for the expected current and installation environment.