48V to 12V DC-DC Chargers

Victron 48V to 12V DC-DC Chargers for Mixed-Voltage Systems

A 48V battery bank is an efficient way to run inverters and large loads. Most RVs, boats, trucks and off-grid builds still rely on 12V circuits for lighting, pumps, fridges, electronics and starting or auxiliary batteries. A 48V to 12V DC-DC charger bridges the two. It supplies a controlled 12V output from your 48V system, so you can keep a single high-voltage house bank and still run a dependable 12V side.

This range covers isolated Victron Orion-Tr units in 20A and 30A output ratings. These suit installers and owners who want a recognised, well-supported platform for 48V to 12V battery charging and power conversion.

Why Choose an Isolated 48V to 12V Charger?

Both Orion-Tr models in this collection are isolated. This means the input and output are galvanically separated. Isolation helps prevent ground loops and limits electrical noise between systems. It also helps keep the 48V and 12V circuits electrically independent, which is a common requirement in marine installs and in vehicles with separate earthing arrangements. To understand when isolation matters for your build, see our guide to isolated vs non-isolated DC-DC chargers and converters.

Models in This Range

• Victron Orion-Tr Smart 48/12-20A (240W): This isolated smart charger is configured via Bluetooth and the VictronConnect app. It suits charging a 12V auxiliary or starter battery from a 48V bank with an adjustable charge profile.
• Victron Orion-Tr 48/12-30A Isolated: This model offers a higher current output for 12V circuits where more continuous power is the priority and app configuration is not required.
• Robust Orion-Tr construction: Both models share an enclosure designed for permanent installation in vehicles, vessels and off-grid power cabinets.
• Victron ecosystem fit: They integrate neatly into Victron-based 48V systems alongside existing inverters, batteries and monitoring.

Sizing and Selection Tips

Start by adding up the 12V loads you expect to run at the same time, then allow headroom above that figure. If you are mainly maintaining a 12V battery and running modest loads such as lights, water pumps and electronics, the 20A Orion-Tr Smart offers app-based control and charge profile adjustment. If your 12V side carries heavier continuous loads, the 30A model provides more output capacity.

Size your input and output cabling and fusing to suit the charger's current on each side. Cable runs from a 48V bank carry less current than the 12V output, so each side needs to be specified separately. Where several units are needed for higher 12V demand, confirm parallel operation and wiring with the product documentation before installing.

Working with a different system voltage? Browse 24V to 12V DC-DC chargers for 24V trucks and vessels. You can also view the full 12V DC-DC charger range for alternator-to-auxiliary charging.

Power Your 12V Side From Your 48V Bank

Choose the Orion-Tr model that matches your 12V load and charging needs. You can then run a dependable 12V system without a second large battery bank. Compare the 20A Smart and 30A isolated options above and add the right Victron 48V to 12V charger to your build today.